US20130072933A1 - Bone screw and bone screw with holding element - Google Patents
Bone screw and bone screw with holding element Download PDFInfo
- Publication number
- US20130072933A1 US20130072933A1 US13/564,559 US201213564559A US2013072933A1 US 20130072933 A1 US20130072933 A1 US 20130072933A1 US 201213564559 A US201213564559 A US 201213564559A US 2013072933 A1 US2013072933 A1 US 2013072933A1
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- bone screw
- section
- holding element
- bone
- thread section
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
- A61B17/7241—Intramedullary pins, nails or other devices with special means of locking the nail to the bone the nail having separate elements through which screws pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/8635—Tips of screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/74—Devices for the head or neck or trochanter of the femur
- A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
- A61B17/744—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to an intramedullary nail
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/74—Devices for the head or neck or trochanter of the femur
- A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
- A61B17/746—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to a plate opposite the femoral head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8645—Headless screws, e.g. ligament interference screws
Definitions
- the present invention relates to a bone screw, in particular to a bone screw with a thread section having a periphery with an open net-like or mesh-like structure.
- a bone screw having a tubular wall with a plurality of recesses is described in DE 100 55 891 A1. It includes a thread section, a tip at one end and a head for engagement with a screwdriver at the other end.
- the thread section of the tubular wall also comprises the plurality of recesses.
- This bone screw can be used e.g. in the treatment of osteoporotic fractures.
- fusion with surrounding bone material can take place.
- a bone screw system including a cannulated bone screw and an adapter designed to be releasably coupled to the screw is known from U.S. Pat. No. 6,048,343.
- the bone screw has a head with a diameter which is larger than the diameter of the shaft of the screw.
- the largest diameter of the adapter is also greater than the diameter of the shaft of the bone screw.
- DE 199 49 285 A1 discloses a similar bone screw system including a bone screw and an adapter.
- the present invention provides a bone screw with a thread section having a periphery with an open mesh (or net-like) structure and a bone fixation device with improved properties.
- Preferred bone screws of the present invention can be positioned precisely and, optionally, also can be connected to external and/or internal bracing implants.
- a bone screw comprises a thread section of tubular construction having a tip at its first end, a second end opposite the latter, and a holding element with a first section for connection to the second end of the thread section and a rod-like second section which, in the inserted state of the holding element, protrudes beyond the second end of the thread section.
- the tubular thread section comprises a bone thread on its outer wall and the outer wall of the thread section comprises a plurality of recesses providing an open mesh structure.
- a stop is provided for limiting the distance of insertion of the holding element into the thread section.
- the bone screw comprises a thread section of tubular construction having a tip at its first end and a second end opposite the latter and, adjoining the second end of the thread section, a section free of bone thread and integral with the thread section.
- a means for engagement with a screw-in tool and/or a means for attaching a fixation element is provided.
- the tubular thread section comprises a bone thread on its outer wall and the wall of the thread section comprises a plurality of recesses providing an open mesh structure.
- the fixation element comprises a fixation plate with a hole or recess through which the free end of the rod-like holding element can be passed
- the attaching means comprises a nut for screwing onto the holding element from its free end for fixing the plate
- the invention also provides a bone fixation device comprising at least one bone screw as described herein and a marrow nail for fixing a bone, the marrow nail having a borehole through which the free end of the rod-like holding element can be passed.
- the thread section 2 of tubular construction comprises an internal thread section 24 at its second end and the first section 41 , 61 of the holding element 4 , 6 comprises an external thread for screwing into the internal thread section 24 ;
- the connection between the holding element 4 , 6 and the thread section 2 is made in the form of an interference fit;
- the holding element 4 , 6 comprises an element 44 , 64 at its free end for engagement with a screw-in tool;
- the stop is provided in the form of a shoulder 42 , 62 between the first section 41 , 61 and the second section 43 , 63 of the holding element;
- the stop is provided in the tubular thread section 2 of the bone screw 1 ;
- the rod-like section 43 , 63 of the holding element 4 , 6 comprises an external thread for screwing on a nut 83 from the free end of the holding element 4 , 6 ;
- the thread section 2 of tubular construction comprises an internal thread section 23
- the invention further provides a holding element 4 , 6 for attaching to a bone screw, wherein the bone screw comprises a tip at its first end and, at the second end opposite the latter, a section for connection to the holding element.
- the holding element comprises a first section 41 , 61 for connection to the bone screw, a rod-like second section 43 , 63 and, preferentially, a stop for limiting the distance of insertion of the holding element 4 , 6 into the bone screw.
- the holding element comprises an external thread for screwing into an internal thread section of the bone screw or the connection between the holding element and the bone screw is made in the form of an interference fit.
- the bone screw according to preferred embodiments of the invention has an advantage that it can be immersed to the required location in the bone. Thus, it can fulfil its function as a tension element, without a part protruding from the bone (for example, see FIG. 3 b ).
- the invention also provides a method for repairing a bone having a fracture.
- the method comprises providing a bone screw as described herein, fully introducing the bone screw into the bone and positioning the bone screw at the place of fracture, and attaching the holding element to a bone fixation device.
- the bone fixation device comprises a plate or a marrow nail.
- the method before attaching the bone fixation device, the method also includes removing the holding element from the bone screw, applying a filler material into the interior of the thread section of the bone screw and reconnecting the holding element to the thread section.
- Bone cement or reagents can be placed precisely by means of the bone screw.
- FIG. 1 illustrates an exploded view with several embodiments of a modular structure of a bone screw according to the present invention
- FIG. 2 illustrates a bone screw, as shown in FIG. 1 , in the assembled state
- FIG. 3 a to FIG. 3 c illustrate a sequence of steps for attaching an outer plate to a bone
- FIG. 4 illustrates a view of a combination of the bone screw with a marrow nail
- FIG. 5 illustrates a bone screw according to another embodiment of the present invention.
- a bone screw according to a preferred embodiment of the present invention now will be described with reference to FIGS. 1 and 2 . Part of the bone screw is shown in section in FIG. 2 to improve the clarity.
- the modular bone screw shown in FIGS. 1 and 2 includes a thread section 2 , a tip 3 and a holding element 4 .
- the thread section 2 is of tubular construction and contains in its wall a plurality of recesses 21 which are diamond-shaped in the embodiment as shown and provide an open mesh structure.
- the diamond-shaped recesses are oriented in such a way that an axis of symmetry extends parallel to the axis of symmetry or longitudinal axis of the tube respectively.
- the diamonds also are staggered from each other.
- the tubular thread section 2 comprises at each of its two ends an internal thread 23 , 24 , e.g., a metric thread.
- the tip 3 includes a shank portion 32 and the actual tip portion 31 having tapered sides.
- the shank 32 comprises an external thread which corresponds to the internal thread 23 of the tubular thread section 2 for connection of the tip 3 to the thread section 2 , as shown in FIG. 2 .
- the holding element 4 comprises at a first end a first section 41 with an external thread which corresponds to the internal thread 23 of the tubular thread section 2 for connection of the holding element 4 to the thread section 2 , as shown in FIG. 2 .
- a stop 42 is provided in the form of a shoulder or annular projection from the outer surface. The stop limits the screw-in distance when assembling the holding element 4 with the thread section 2 .
- the outer diameter of the annular projection of stop 42 preferably corresponds to the outer diameter of the tubular thread section 2 , so that it does not form an obstacle in the bone opening when the bone screw is screwed into the bone.
- the holding element further comprises a rod-like section 43 which, as shown in FIG. 2 , protrudes beyond the second end of the thread section 2 of the assembly.
- the rod-like section 43 preferably is provided continuously with a metric external thread.
- the axial length of the rod-like second section 43 preferably is longer than that of the first section 41 , which is to be screwed into the thread section 2 . Due to the modular construction of the bone fixation device, the length of the holding element can be selected by the surgeon at the place of use of the bone screw in such a way that the tubular thread section 2 can be immersed to the required location in the bone.
- the holding element comprises an engagement element for a screw-in tool in the form of a hexagon shaped outer surface 44 .
- the engagement element can be a structure that corresponds to any standard or non-standard driving tool for turning the bone fixation assembly.
- the thread section 2 , the tip 3 and the holding element 4 are formed preferably from titanium. However, any other biocompatible material can be used providing it has sufficient strength properties for use in a bone fixation application.
- the bone screw 1 e.g., is inserted into the end of a long bone which is weakened from the inside by osteoporosis, e.g., in the neck of a femur.
- the fixation device is assembled, first, by screwing the tip 3 into the tubular thread section 2 .
- the holding element 4 is screwed into the thread section 2 .
- FIG. 2 the structure shown in FIG. 2 is obtained.
- the bone screw 1 composed of thread section 2 , tip 3 and holding element 4 is screwed into the bone.
- the thread section 2 can be immersed deep in the bone and at the same time positioned precisely at the place of fracture.
- the holding element 4 is unscrewed and removed from the thread section 2 .
- a filler material such as bone cement or the like and/or a medicinal or growth-promoting reagent, if desired, can be injected into the interior of the thread section 2 .
- the thread section 2 ensures more accurate positioning of the injection channel and more even distribution of the injected material which can exit through the recesses 21 into the adjacent sections of the bone. As a result, fixation of the bone by the screw can be improved further.
- the immersed bone screw serves as a reinforcement for the bone trabeculae weakened e.g. by osteoporosis. Through the recesses 21 , the bone can grow into the screw. Stabilization of the fracture point of the weakened bone, thus, takes place as a combination of tension relief and fusion.
- FIG. 3 c illustrates the use of an outer fixation plate 81 as a fixation device 80 for fixation of the bone.
- the holding element 4 is screwed back into the thread section 2 .
- the plate 81 with a recess (or through-hole) 82 is applied to the bone in such a way that the free end of the holding element 4 extends through the recess 82 , and the plate 81 is rigidly connected to the bone screw 1 by screwing a nut 83 onto the external thread of the rod-like section 43 of the holding element 4 .
- bone screws 84 can be added to serve for a stable fixation of the plate 81 to the bone.
- the rod-like section 43 the holding element 4 preferably can be shortened to a finished length such that it does not protrude substantially beyond the nut 83 .
- FIG. 4 shows a further example of application of the bone screw according to the first embodiment.
- fixation of the bone takes place not by means of an outer fixation plate but, instead, by means of a marrow nail 91 introduced into the bone.
- the marrow nail 91 comprises at least one recess (or bore hole) 92 through which extends at least one holding element 4 of a bone screw 1 .
- a closure screw 93 closes the marrow nail against the outside, and a locking screw 94 prevents movement in the longitudinal direction.
- a second embodiment of the modular bone screw 1 shown in FIG. 1 differs from the first embodiment in that, instead of the tip 3 , a cannulated tip 5 is provided. Further, in this embodiment the holding element is a cannulated holding element 6 .
- the cannulated tip 5 differs from the tip 3 in that, in addition, a coaxial bore 53 for passage of a reagent is provided.
- the cannulated holding element 6 differs from the holding element 4 in that, in addition, a coaxial bore 65 is provided and in that the rod-like section 63 is not provided with a metric thread over its whole length like the rod-like section 43 in the first embodiment, but only in a partial section 66 .
- This embodiment has the advantage that, even without unscrewing the holding element and even after installation is completed, a medicinal reagent can be introduced precisely to the desired location, e.g., by means of a syringe.
- a third embodiment of the modular bone screw 1 shown in FIG. 1 differs from the first and second embodiments in that, instead of the tip 3 , a self-tapping tip 7 is provided. All of the other characteristics correspond to the first or second embodiment, and use of this embodiment takes place in the same way, as well. Introduction of the bone screw into the bone can be easier by the self-tapping tip.
- a fourth embodiment shown in FIG. 5 differs from the first to third embodiments shown in FIGS. 1 and 2 in the structure of the screw section.
- the bone screw 10 in accord with the fourth embodiment, includes a screw section 11 and a tip.
- the screw section 11 is of tubular construction and consists of a thread section 12 and an integral section 13 free of bone thread. Any of the tips 3 , 5 and 7 described in the first to third embodiments can be used as the tip.
- the thread section 12 like the thread section 2 described in the first embodiment, comprises in its circumferential wall a plurality of recesses 21 and, on its outer surface of the wall, a bone thread 22 .
- the section 13 is formed without bone thread. In this embodiment as shown, no recesses are formed in the wall in the section 13 , which is free of bone thread. However, in certain preferred embodiments, recesses can be provided here, too, to provide further open mesh structure.
- the tubular screw section 11 comprises preferably at each of its two ends a metric internal thread 14 , 15 .
- the axial length of the section 13 (free of bone thread) is selected as a function of the place of use of the bone screw in such a way that the thread section 12 can be immersed to the required location in the bone.
- the axial length of the section 13 also can be longer than the axial length of the thread section 12 .
- the tubular screw section 11 is preferably formed from titanium. However, as stated above, any other biocompatible material having suitable strength properties can be used as well.
- a holding element 4 , 6 can be screwed into the internal thread 15 .
- the holding element can be removed later or can remain as an extender.
- a head with an engagement element can be inserted using thread 15 for engaging and cooperating with a screw-in tool.
- the free end of the section 13 without bone thread can also itself comprise an engagement element for a screw-in tool, e.g., a cross recess.
- Thread section, tip and holding element can be combined with each other not only as described in the embodiments, but in many ways by those skilled in the art after considering this disclosure. This modular structure allows adaptation to the most varied demands.
- the stop for limiting the distance of screwing the holding element 4 , 6 into the thread section 2 can be provided in the tubular thread section 2 instead of on the holding element 4 , 6 , e.g. at the end of the internal thread 24 .
- the holding element 4 , 6 can be formed such that the rod-like section 43 , 63 comprises an external thread over its whole length as in the first embodiment, or only in a partial section as in the second embodiment.
- the rod-like section 43 , 63 can also be formed completely without an external thread.
- the diameter of the rod-like section 43 , 63 can, as shown in FIGS. 1 and 2 , be the same as that of the first section 41 , 61 of the holding element 4 , 6 , but it can also have a different, preferably smaller diameter.
- the rod-like section can be made of a tubular construction, similar to the thread section.
- the holding section 14 according to the fourth embodiment too can have an external thread over its whole length or only in a partial section as in the second embodiment.
- any other shape or type of engagement element for cooperating with a screw-in tool can be provided.
- the free end of the holding element 4 , 6 alternatively can have, e.g., a recess for an Allen type wrench, too.
- the holding element 4 , 6 also can be designed without an engagement element 44 , 64 for a screw-in tool. The bone screw is then screwed in with a suitable tool which engages with the rod-like section 43 .
- thread sections 23 , 24 , 41 , 43 , 61 , 66 , 14 and 15 have been described sometimes herein as metric in the embodiments.
- the threads can be inch threads or in some other suitable form.
- a single internal thread which extends over the whole length of the thread section 2 or screw section 11 can be formed (this also can be applied for holding element sections that are a tubular structure).
- diamond-shaped recesses 21 As an alternative to the diamond-shaped recesses 21 , other shapes of opening can be provided, in particular, round openings.
- the tip 3 , 5 , 7 can be connected to the thread section 2 or 12 not only by screwing in.
- the first end of the thread section 2 or 12 and the shank 32 , 52 , 72 of the tip 3 , 5 , 7 can be formed without the respective threads and defined in their dimensions such that the tip 3 , 5 , 7 is rigidly connected to the thread section 2 or 12 in a snug fit or interference fit.
- the tip 3 , 5 , 7 can be connected rigidly to the thread section 2 or 12 in any other way.
- the tip and thread section also can be formed integrally in one piece.
- the holding element 4 , 6 can be connected rigidly to the thread section 2 or 12 in a snug (or interference) fit or in any other way.
- the tubular thread section 2 can be filled, e.g., with bone material before screwing on the holding element. Then, the screw is immersed.
- the screw can also remain in the immersed state without being connected to a plate via a holding element.
- the bone screw 1 , 10 is not suitable only, as shown in the practical examples, for introduction into long bones. It can be used e.g. in vertebrae or other bones as well.
- the holding element 4 , 6 can be used not only in combination with the tubular thread section 2 , but also with any other form of bone screws which can be, e.g., solid or cannulated.
- the connection to other forms of bone screws is made in the same or a similar way as the connection to the thread section 2 described above.
Abstract
A bone screw is provided, with a thread section (2) of tubular construction having a tip (3) at its first end and a second end opposite the latter. The tubular thread section (2) comprises a bone thread (22) on its outer wall, and the wall of the thread section (2) comprises a plurality of recesses (21). The bone screw further includes a holding element (4, 6) with a first section (41, 61) for connection to the thread section (2) and with a rod-like second section (43, 63) which in the inserted state of the holding element (4, 6) protrudes beyond the second end of the thread section (2). A stop is provided for limiting the distance of insertion of the holding element (4, 6) in the thread section (2). The holding element (4, 6) comprises an element (44, 64) at its free end for engagement with a screw-in tool.
Description
- The present invention relates to a bone screw, in particular to a bone screw with a thread section having a periphery with an open net-like or mesh-like structure..
- A bone screw having a tubular wall with a plurality of recesses is described in DE 100 55 891 A1. It includes a thread section, a tip at one end and a head for engagement with a screwdriver at the other end. The thread section of the tubular wall also comprises the plurality of recesses.
- This bone screw can be used e.g. in the treatment of osteoporotic fractures. On account of the open mesh (or net-like) design of the screw, fusion with surrounding bone material can take place.
- A problem can be encountered when the position of the fracture in the bone, which e.g. in the hipbone is far away from the surface from which the screw is screwed in. In such situation, for reliable fixation, precise positioning of the bone screw is required and, sometimes, a mechanical connection to external and/or internal bracing implants also may be required.
- A bone screw system including a cannulated bone screw and an adapter designed to be releasably coupled to the screw is known from U.S. Pat. No. 6,048,343. The bone screw has a head with a diameter which is larger than the diameter of the shaft of the screw. The largest diameter of the adapter is also greater than the diameter of the shaft of the bone screw. Thus the bone screw cannot be placed at a fracture which is at a location far away from the surface of the bone. DE 199 49 285 A1 discloses a similar bone screw system including a bone screw and an adapter.
- The present invention provides a bone screw with a thread section having a periphery with an open mesh (or net-like) structure and a bone fixation device with improved properties. Preferred bone screws of the present invention can be positioned precisely and, optionally, also can be connected to external and/or internal bracing implants.
- In accord with one embodiment of the present invention, a bone screw comprises a thread section of tubular construction having a tip at its first end, a second end opposite the latter, and a holding element with a first section for connection to the second end of the thread section and a rod-like second section which, in the inserted state of the holding element, protrudes beyond the second end of the thread section. The tubular thread section comprises a bone thread on its outer wall and the outer wall of the thread section comprises a plurality of recesses providing an open mesh structure. Preferably, a stop is provided for limiting the distance of insertion of the holding element into the thread section.
- In another embodiment of the invention, the bone screw comprises a thread section of tubular construction having a tip at its first end and a second end opposite the latter and, adjoining the second end of the thread section, a section free of bone thread and integral with the thread section. At the end of the adjoining section free of bone thread opposite the tip, preferably, a means for engagement with a screw-in tool and/or a means for attaching a fixation element is provided. The tubular thread section comprises a bone thread on its outer wall and the wall of the thread section comprises a plurality of recesses providing an open mesh structure.
- In a preferred embodiment, the fixation element comprises a fixation plate with a hole or recess through which the free end of the rod-like holding element can be passed, and the attaching means comprises a nut for screwing onto the holding element from its free end for fixing the plate.
- The invention also provides a bone fixation device comprising at least one bone screw as described herein and a marrow nail for fixing a bone, the marrow nail having a borehole through which the free end of the rod-like holding element can be passed.
- Certain preferred embodiments of the bone screws of the present invention comprise one or more of the following (wherein references to the drawings are provided as merely exemplary): the
thread section 2 of tubular construction comprises aninternal thread section 24 at its second end and thefirst section 41, 61 of theholding element internal thread section 24; the connection between theholding element thread section 2 is made in the form of an interference fit; theholding element element shoulder first section 41, 61 and thesecond section tubular thread section 2 of the bone screw 1; the rod-like section holding element nut 83 from the free end of theholding element thread section 2 of tubular construction comprises aninternal thread section 23 at its first end; thethread section 2 of tubular construction comprises aninternal thread section 23 that extends over the whole length of thethread section 2 of the tubular construction and thetip thread section 2 can be screwed into thisinternal thread section 23; theinternal thread section tip 7 is designed and structured as a self-tapping tip; the tip 5 is cannulated (i.e., comprises a cannula); theholding element 6 is cannulated; and/or the length of thesection 13 free of bone thread is the same as or greater than that of thethread section 12. - The invention further provides a
holding element first section 41, 61 for connection to the bone screw, a rod-likesecond section holding element second section holding element - Preferably, the holding element comprises an external thread for screwing into an internal thread section of the bone screw or the connection between the holding element and the bone screw is made in the form of an interference fit.
- The bone screw according to preferred embodiments of the invention has an advantage that it can be immersed to the required location in the bone. Thus, it can fulfil its function as a tension element, without a part protruding from the bone (for example, see
FIG. 3 b). - The invention also provides a method for repairing a bone having a fracture. The method comprises providing a bone screw as described herein, fully introducing the bone screw into the bone and positioning the bone screw at the place of fracture, and attaching the holding element to a bone fixation device. Preferably, the bone fixation device comprises a plate or a marrow nail. In preferred embodiments, before attaching the bone fixation device, the method also includes removing the holding element from the bone screw, applying a filler material into the interior of the thread section of the bone screw and reconnecting the holding element to the thread section.
- Bone cement or reagents can be placed precisely by means of the bone screw.
- Further characteristics and advantages of the invention are shown by the description of embodiments with the aid of the attached drawings wherein:
-
FIG. 1 illustrates an exploded view with several embodiments of a modular structure of a bone screw according to the present invention; -
FIG. 2 illustrates a bone screw, as shown inFIG. 1 , in the assembled state; -
FIG. 3 a toFIG. 3 c illustrate a sequence of steps for attaching an outer plate to a bone; -
FIG. 4 illustrates a view of a combination of the bone screw with a marrow nail; -
FIG. 5 illustrates a bone screw according to another embodiment of the present invention. - A bone screw according to a preferred embodiment of the present invention now will be described with reference to
FIGS. 1 and 2 . Part of the bone screw is shown in section inFIG. 2 to improve the clarity. - The modular bone screw shown in
FIGS. 1 and 2 includes athread section 2, atip 3 and aholding element 4. Thethread section 2 is of tubular construction and contains in its wall a plurality of recesses 21 which are diamond-shaped in the embodiment as shown and provide an open mesh structure. The diamond-shaped recesses are oriented in such a way that an axis of symmetry extends parallel to the axis of symmetry or longitudinal axis of the tube respectively. The diamonds also are staggered from each other. - On the outer surface of the wall there is provided a so-called
bone thread 22 which corresponds in shape to that of the usual bone screws that are well known to those skilled in the art. On the inner surface of the wall, thetubular thread section 2 comprises at each of its two ends aninternal thread - The
tip 3 includes ashank portion 32 and the actual tip portion 31 having tapered sides. In the embodiment shown, theshank 32 comprises an external thread which corresponds to theinternal thread 23 of thetubular thread section 2 for connection of thetip 3 to thethread section 2, as shown inFIG. 2 . - The
holding element 4 comprises at a first end a first section 41 with an external thread which corresponds to theinternal thread 23 of thetubular thread section 2 for connection of theholding element 4 to thethread section 2, as shown inFIG. 2 . At the end of the thread section 41, astop 42 is provided in the form of a shoulder or annular projection from the outer surface. The stop limits the screw-in distance when assembling theholding element 4 with thethread section 2. As can be seen in particular fromFIG. 2 , the outer diameter of the annular projection ofstop 42 preferably corresponds to the outer diameter of thetubular thread section 2, so that it does not form an obstacle in the bone opening when the bone screw is screwed into the bone. - The holding element further comprises a rod-
like section 43 which, as shown inFIG. 2 , protrudes beyond the second end of thethread section 2 of the assembly. The rod-like section 43 preferably is provided continuously with a metric external thread. The axial length of the rod-likesecond section 43 preferably is longer than that of the first section 41, which is to be screwed into thethread section 2. Due to the modular construction of the bone fixation device, the length of the holding element can be selected by the surgeon at the place of use of the bone screw in such a way that thetubular thread section 2 can be immersed to the required location in the bone. - At its free end opposite the section 41, the holding element comprises an engagement element for a screw-in tool in the form of a hexagon shaped
outer surface 44. However, the engagement element can be a structure that corresponds to any standard or non-standard driving tool for turning the bone fixation assembly. - The
thread section 2, thetip 3 and the holdingelement 4 are formed preferably from titanium. However, any other biocompatible material can be used providing it has sufficient strength properties for use in a bone fixation application. - Use of the bone screw now is described with reference to
FIGS. 2 and 3 . The bone screw 1, e.g., is inserted into the end of a long bone which is weakened from the inside by osteoporosis, e.g., in the neck of a femur. - The fixation device is assembled, first, by screwing the
tip 3 into thetubular thread section 2. Next, the holdingelement 4 is screwed into thethread section 2. As a result the structure shown inFIG. 2 is obtained. - Next, as shown in
FIG. 3 a, the bone screw 1 composed ofthread section 2,tip 3 and holdingelement 4 is screwed into the bone. In the process, thethread section 2 can be immersed deep in the bone and at the same time positioned precisely at the place of fracture. Then, the holdingelement 4 is unscrewed and removed from thethread section 2. - In a further step, such as depicted in
FIG. 3 b, a filler material such as bone cement or the like and/or a medicinal or growth-promoting reagent, if desired, can be injected into the interior of thethread section 2. By contrast with direct injection, thethread section 2 ensures more accurate positioning of the injection channel and more even distribution of the injected material which can exit through the recesses 21 into the adjacent sections of the bone. As a result, fixation of the bone by the screw can be improved further. - The immersed bone screw serves as a reinforcement for the bone trabeculae weakened e.g. by osteoporosis. Through the recesses 21, the bone can grow into the screw. Stabilization of the fracture point of the weakened bone, thus, takes place as a combination of tension relief and fusion.
-
FIG. 3 c illustrates the use of anouter fixation plate 81 as afixation device 80 for fixation of the bone. Here, after injection of the filler material, if desired, the holdingelement 4 is screwed back into thethread section 2. Theplate 81 with a recess (or through-hole) 82 is applied to the bone in such a way that the free end of the holdingelement 4 extends through therecess 82, and theplate 81 is rigidly connected to the bone screw 1 by screwing anut 83 onto the external thread of the rod-like section 43 of the holdingelement 4. Further, bone screws 84 can be added to serve for a stable fixation of theplate 81 to the bone. The rod-like section 43 the holdingelement 4 preferably can be shortened to a finished length such that it does not protrude substantially beyond thenut 83. -
FIG. 4 shows a further example of application of the bone screw according to the first embodiment. With thefixation device 90, fixation of the bone takes place not by means of an outer fixation plate but, instead, by means of amarrow nail 91 introduced into the bone. Themarrow nail 91 comprises at least one recess (or bore hole) 92 through which extends at least one holdingelement 4 of a bone screw 1. In the embodiment shown inFIG. 4 , there are two bone screws 1 with different diameters. Aclosure screw 93 closes the marrow nail against the outside, and a lockingscrew 94 prevents movement in the longitudinal direction. - A second embodiment of the modular bone screw 1 shown in
FIG. 1 differs from the first embodiment in that, instead of thetip 3, a cannulated tip 5 is provided. Further, in this embodiment the holding element is a cannulatedholding element 6. The cannulated tip 5 differs from thetip 3 in that, in addition, acoaxial bore 53 for passage of a reagent is provided. The cannulatedholding element 6 differs from the holdingelement 4 in that, in addition, acoaxial bore 65 is provided and in that the rod-like section 63 is not provided with a metric thread over its whole length like the rod-like section 43 in the first embodiment, but only in apartial section 66. - All other characteristics of this second embodiment match the first embodiment, and use of the device also takes place in the same way. This embodiment has the advantage that, even without unscrewing the holding element and even after installation is completed, a medicinal reagent can be introduced precisely to the desired location, e.g., by means of a syringe.
- A third embodiment of the modular bone screw 1 shown in
FIG. 1 differs from the first and second embodiments in that, instead of thetip 3, a self-tappingtip 7 is provided. All of the other characteristics correspond to the first or second embodiment, and use of this embodiment takes place in the same way, as well. Introduction of the bone screw into the bone can be easier by the self-tapping tip. - A fourth embodiment shown in
FIG. 5 differs from the first to third embodiments shown inFIGS. 1 and 2 in the structure of the screw section. Thebone screw 10, in accord with the fourth embodiment, includes a screw section 11 and a tip. The screw section 11 is of tubular construction and consists of athread section 12 and anintegral section 13 free of bone thread. Any of thetips - The
thread section 12, like thethread section 2 described in the first embodiment, comprises in its circumferential wall a plurality of recesses 21 and, on its outer surface of the wall, abone thread 22. Thesection 13, on the other hand, is formed without bone thread. In this embodiment as shown, no recesses are formed in the wall in thesection 13, which is free of bone thread. However, in certain preferred embodiments, recesses can be provided here, too, to provide further open mesh structure. - On the inner surface of the wall, the tubular screw section 11 comprises preferably at each of its two ends a metric
internal thread thread section 12 can be immersed to the required location in the bone. The axial length of thesection 13 also can be longer than the axial length of thethread section 12. - The tubular screw section 11 is preferably formed from titanium. However, as stated above, any other biocompatible material having suitable strength properties can be used as well.
- Use of the embodiment shown in
FIG. 5 also takes place in the same way as in the first to third embodiments, as described above. To screw thebone screw 10 into the bone, a holdingelement internal thread 15. The holding element can be removed later or can remain as an extender. Alternatively, a head with an engagement element can be inserted usingthread 15 for engaging and cooperating with a screw-in tool. The free end of thesection 13 without bone thread can also itself comprise an engagement element for a screw-in tool, e.g., a cross recess. - The embodiments described are only examples. Thread section, tip and holding element can be combined with each other not only as described in the embodiments, but in many ways by those skilled in the art after considering this disclosure. This modular structure allows adaptation to the most varied demands.
- The stop for limiting the distance of screwing the holding
element thread section 2 can be provided in thetubular thread section 2 instead of on the holdingelement internal thread 24. - The holding
element like section like section like section FIGS. 1 and 2 , be the same as that of thefirst section 41, 61 of the holdingelement - The holding
section 14 according to the fourth embodiment too can have an external thread over its whole length or only in a partial section as in the second embodiment. - Instead of the
outer hexagon section element element engagement element like section 43. - The
thread sections - Instead of the
internal threads thread section 2 or screw section 11 can be formed (this also can be applied for holding element sections that are a tubular structure). This has the advantage that the tubular material can be manufactured in long pieces and cut to any length, so that bone screws of the desired length can be made at the site of use, and so stockkeeping of various lengths of components can be substantially reduced. - As an alternative to the diamond-shaped recesses 21, other shapes of opening can be provided, in particular, round openings.
- The
tip thread section thread section shank tip tip thread section tip thread section - The holding
element thread section - As an alternative to the procedure shown in
FIGS. 3 a) to c), thetubular thread section 2 can be filled, e.g., with bone material before screwing on the holding element. Then, the screw is immersed. - The screw can also remain in the immersed state without being connected to a plate via a holding element.
- The combination of tension relief and fusion described above with reference to
FIGS. 3 a)-3 c) can of course be carried out not only in the femur, as mentioned as an example, but also in any other bones, e.g., the tibia, etc. - The
bone screw 1, 10 is not suitable only, as shown in the practical examples, for introduction into long bones. It can be used e.g. in vertebrae or other bones as well. - The holding
element tubular thread section 2, but also with any other form of bone screws which can be, e.g., solid or cannulated. The connection to other forms of bone screws is made in the same or a similar way as the connection to thethread section 2 described above. - This invention has been described in detail including the preferred embodiments thereof. However, it will be appreciated that those skilled in the art, upon consideration of this disclosure, may make modifications and improvements within the spirit and scope of this invention.
Claims (31)
1. A bone screw comprising:
a thread section of elongated tubular construction with an outer wall and having a first end and a second end;
a tip at the first end; and
an elongated holding element connected to the thread section at the second end, the holding element comprising a first section for connection to the second end of the thread section and an elongated rod-like second section having a longitudinal length and a free end opposite the first section;
wherein the tubular thread section further comprises a bone thread on the outer wall and the outer wall of the thread section contains a plurality of recesses forming a mesh-like open network; and wherein the bone screw is dimensioned such, that the bone screw can be fully immersed in the opening created when screwing in.
2. A bone screw according to claim 1 , further comprising a stop for limiting a distance of insertion of the holding element into the thread section.
3. A bone screw according to claim 1 , wherein the thread section further comprises a first internal thread section at its second end and the first section of the holding element comprises an external thread for cooperation with the first internal thread section.
4. A bone screw according to claim 1 , wherein the second end of the thread section and the first section of the holding element are structured and arranged to cooperate for connection in the form of an interference fit.
5. A bone screw according claim 1 , further comprising an engagement element at the free end of the holding element for cooperation with a screw-in tool.
6. A bone screw according to claim 1 , wherein the holding element further comprises a stop located between the first section and the second section to prevent further penetration of the holding element into the thread section.
7. A bone screw according to claim 5 , wherein the stop comprises a shoulder.
8. A bone screw according to claim 1 , wherein the thread section further comprises a stop located on the inside of the outer wall to prevent further penetration of the holding element into the thread section.
9. A bone screw according to claim 1 , further comprising a nut, and wherein the rod-like section of the holding element further comprises a second external thread at the free end for cooperation with the nut.
10. A bone screw according to claim 1 , wherein the thread section further comprises a second internal thread section at the first end.
11. A bone screw according to claim 1 , wherein the first internal thread section extends over the whole length of the thread section and the tip is structured and arranged to cooperate with the first internal thread section.
12. A bone screw according to claim 1 , wherein the first internal thread section comprises a metric or an inch thread.
13. A bone screw according to claim 1 , wherein the tip is structured and arranged as a self-tapping tip.
14. A bone screw according to claim 1 , wherein the tip comprises a cannula.
15. A bone screw according to claim 14 , wherein the holding element comprises a cannula.
16. A bone screw according to claim 1 , wherein the holding element comprises a cannula.
17. A bone screw comprising:
a thread section of elongated tubular construction with an outer wall and having a first end and a second end, the outer wall containing a plurality of recesses forming a mesh-like open network;
a tip at the first end; and
an engagement element at the second end capable of cooperating with a screw-in tool;
wherein the thread section further comprises:
a bone thread on the outer wall and having a first length;
an adjoining section free of bone thread and having a second length, the adjoining section comprising the second end of the thread section; wherein the diameter of said section free of bone thread is dimensioned such that the bone screw can be fully immersed in the opening created when screwing in.
18. A bone screw according to claim 17 , wherein the engagement element comprises an internal thread section at the second end that cooperates with a screw-in tool.
19. A bone screw according to claim 17 , wherein the engagement element comprises an internal thread section at the second end, and the bone screw further comprises a driving element that cooperates with the engagement element and further cooperates with a screw-in tool.
20. A bone screw according to claim 17 , wherein the engagement element comprises an internal thread section at the second end, and the bone screw further comprises a fixation element that cooperates with the engagement element for fixing the bone screw.
21. A bone screw according to claim 17 , wherein the second length of the adjoining section is the same as or greater than the first length of the bone thread section.
22. A bone fixation device comprising a bone screw according to claim 1 , a plate for fixation of a bone, the plate comprising a recess through which the free end of the rod-like section of the holding element can be passed, and a nut for cooperating with the holding element to fix the plate.
23. A bone fixation device comprising a bone screw according to claim 1 and a marrow nail for fixing a bone, the marrow nail comprising a recess through which the free end of the rod-like section of the holding element can be passed.
24. A holding element for cooperation with a bone screw, wherein the bone screw comprises an elongated tubular construction having a first end, a second end, a tip at the first end and a connecting element at the second end for connection to the holding element, the holding element comprising a first section for connection to the bone screw and an elongated rod-like second section having a length; and wherein the holding element is dimensioned such that it can be at least partly introduced in the opening created by the bone screw when screwing in.
25. A holding element according to claim 24 , further comprising a stop for limiting a distance of insertion of the holding element into the bone screw.
26. A holding element according to claim 24 , wherein the bone screw comprises an internal thread section at its second end and the first section of the holding element comprises an external thread for cooperation with the internal thread section.
27. A holding element according to claim 24 , wherein the connecting element and the first section both are structured and arranged to cooperate to provide and interference fit between the bone screw and the holding element.
28. A method for repairing a bone having a fracture, the method comprising:
providing a bone screw in accord with claim 1 ;
fully introducing the bone screw into the bone and positioning the bone screw at the place of fracture; and
attaching a fixation device to the holding element.
29. A method according to claim 28 , further comprising shortening the holding element to avoid unnecessary protrusion beyond the fixation plate.
30. A method according to claim 28 , wherein before attaching the fixation device, the method further comprises:
removing the holding element from the bone screw;
applying a filler material into the interior of the thread section of the bone screw; and
reconnecting the holding element to the thread section.
31. A method according to claim 28 , wherein the fixation device comprises a plate or a marrow nail.
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US13/564,559 US20130072933A1 (en) | 2002-10-04 | 2012-08-01 | Bone screw and bone screw with holding element |
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US13/564,559 US20130072933A1 (en) | 2002-10-04 | 2012-08-01 | Bone screw and bone screw with holding element |
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US13/564,559 Abandoned US20130072933A1 (en) | 2002-10-04 | 2012-08-01 | Bone screw and bone screw with holding element |
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Also Published As
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EP2314240A1 (en) | 2011-04-27 |
DE10246386A1 (en) | 2004-04-22 |
US20100286732A1 (en) | 2010-11-11 |
KR101036872B1 (en) | 2011-05-25 |
US7736381B2 (en) | 2010-06-15 |
US20040122431A1 (en) | 2004-06-24 |
DE50313647D1 (en) | 2011-06-01 |
EP1405607A1 (en) | 2004-04-07 |
US8267976B2 (en) | 2012-09-18 |
JP2004121841A (en) | 2004-04-22 |
EP1405607B1 (en) | 2013-10-16 |
EP1844722A1 (en) | 2007-10-17 |
EP1844722B1 (en) | 2011-04-20 |
KR20040031590A (en) | 2004-04-13 |
JP4503259B2 (en) | 2010-07-14 |
EP2314240B1 (en) | 2013-08-14 |
DE10246386B4 (en) | 2008-08-07 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |