|Publication number||USRE42757 E1|
|Application number||US 10/842,057|
|Publication date||27 Sep 2011|
|Filing date||7 May 2004|
|Priority date||15 Feb 2000|
|Also published as||CA2400356A1, CA2400356C, EP1255496A1, EP1255496A4, US6383188, US20010034526, WO2001060268A1|
|Publication number||10842057, 842057, US RE42757 E1, US RE42757E1, US-E1-RE42757, USRE42757 E1, USRE42757E1|
|Inventors||Stephen D. Kuslich, Francis Peterson, Todd Bjork, Joseph E. Gleason, Rodney Rogstad|
|Original Assignee||Spineology, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (18), Referenced by (4), Classifications (11), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present Utility Patent Application claims priority to Provisional Application No. 60/182,610 filed Feb. 15, 2000, the entire contents of which being incorporated herein by reference.
1. Field of the Invention
This invention relates to an expandable reamer for use in surgery, particularly in orthopedic applications.
2. Description of the Related Art
U.S. Pat. No. 5,445,639 to Kuslich et al., describes an intervertebral reamer which is used to ream out the interior of a degenerated disc to clean the interbody space. U.S. Pat. Nos. 5,549,679 and 5,571,189 to Kuslich describes a device and method for stabilizing the spinal segment with an expandable, porous fabric implant for insertion into the interior of a reamed out disc which is packed with material to facilitate bony fusion.
U.S. Pat. No. 5,928,239 to Mirza discloses a reamer which has a shaft and a cutting tip attached through a free rotating hinge such that high speed rotation allows the tip to be deflected outwardly to form a cavity. U.S. Pat. No. 5,591,170 to Spievack et al discloses a powered bone saw which inserts its cutting blade through a bored intramedullary canal.
The reamer of U.S. Pat. No. 5,445,639 is better suited to make a cylindrical bore than a spherical bore as is needed for the methods and apparatus of U.S. Pat. Nos. 5,549,679 and 5,571,189, the disclosure of all of which are incorporated herein by reference. There exists, therefore, a need for an instrument which will simplify the surgeon's task of forming a chamber within the interbody space.
The art described in this section is not intended to constitute an admission that any patent, publication or other information referred to herein is “prior art” with respect to this invention, unless specifically designated as such. In addition, this section should not be construed to mean that a search has been made or that no other pertinent information as defined in 37 C.F.R. § 1.56(a) exists.
The invention provides a surgical tool is for forming hollow chambers within bone that are larger in diameter than the external opening into the chamber. The tool has a distal end with external dimensions sized to be passed through the patient's anatomy to a point of entry into the bone. Retractable cutting blades are provided on the cutting end. The blades can be extended to cut a cavity greater than the diameter of the surgical tool.
A detailed description of the invention is hereafter described with specific reference being made to the drawings in which:
Reference is now directed to
As may best be seen in
The diameter of shaft 136 at distal end 172 is sized such that shaft 136 can be inserted into a patient's body with distal end 172 placed against a diseased disc or other bone without shaft 136 having undue interference with other anatomical organs.
In the embodiment shown, the guide member 182 is inserted into opening 204 with the elongated blade shaft 140 and the blade advancing tab 148 as well as blade guides 156 fully inserted into slot 184. The blade advancing tab 148 projects above the guide member 182 such that a groove 210 may be provided in the blade advancer barrel 138 to allow the assembly to pass therewithin.
The guide member 182 may include a pin 212 which passes from the guide member 182 across the barrel opening 216 to engage the pin opening 232 of the slide door 214. When properly assembled the tab 148 protrudes through the tab opening 230 of the door 214 such as may be seen in
After the guide member 182 is inserted fully into the barrel 138, the slide door 214 is placed onto blade advancer barrel 138 to close the access opening 216. The slide door may be held at the proximal end by engagement of its tabs 220 to slots 222 in the barrel. The distal end of the door 214 is held in position by a lock ring 224 that engages with threads 226 or the like on the distal end of barrel 138 as is shown in
As stated above, the slide door 214 includes a pair of openings 230, 232. Opening 230 engages with tab 148 to keep the elongated shaft 140 from moving. Observation of the position of the pin 212 within the confines of opening 232 allows a user to track the degree of movement that the shaft 136 makes longitudinally in response to turning knob 194.
As may best be seen in
As may best be seen in
Note that if the blades 114 and 116 were ever stuck in an open position, the handle 96 could be removed, allowing the tube to be removed and then the blades 114 and 116 would have nothing to keep them open. This blade setup allows disassembly if the blades are stuck open in the bone. Prior reamer designs may be difficult to disengage in such an event. In this design, the entire device may be disassembled from the proximal end such that the parts are released allowing the blades 114 and 116 to pivot freely. In the embodiment shown in
As shown in
The holder 100 includes an enlarged barrel 102 into which the turn wheel 96 may partially descend and a lower hollow cylindrical guide 104. The distal end 110 of shaft 92 includes a narrow tang 111 which has an opening therethrough to allow blades 114, 116 to be hingedly attached via a hinge pin member 118.
As best shown in
Turn wheel 96 may include depth marking slot 107 which allows the user to see how far the blades have extended or retracted. In addition, the portion of the shaft 92 which may be seen through the slot 107 may have visible markings or surface features to better provide a visual basis for determining the extent of the blade retraction or extension based on the relative position of the shaft 92 within the slot 107. In the unlikely event that the reamer blades 114, 116 cannot be readily retracted within the cavity being formed, the turn wheel 96 may be removed, allowing the holder 100 to slide away from the shaft 92. In such a case, the blades 114, 116 would freely pivot on hinge pin 118 allowing the remainder of the reamer 90 to be readily removed.
As may be best understood from viewing
As may best be seen in
In one embodiment of the invention, when the turn wheel 96 is assembled in the manner described above, the spring 95 (shown in
In an alternative embodiment of the invention, the turn wheel includes a plurality of engagement pins 131. Each engagement pins 131 is engaged to receiving holes 133. In order to rotate the wheel 96 the wheel 96 is pulled in the manner described above, but additionally must be pulled a sufficient distance away from the barrel 102 to disengage the pins 131 from the holes 133. The wheel 96 may then be rotated to a point where the pins 131 may be reinserted into the holes 133 in an advancing clockwise or counterclockwise manner.
When the reamer 90 is assembled in the manner described above, clockwise rotation of the turn wheel 96 causes shaft 92 to be pulled up tube 104 such that ramp portion 120, such as may be seen in
As shown in
As may be seen in
In operation, the blades 114 and 116 are fully retracted and the device 90 is inserted into an opening drilled into the body material where a cavity is to be formed. Typically a hole is drilled into the vertebral body or other bone or area that needs to be reamed to a diameter larger than the outside drill hole. The hole is drilled in the bone, and then a guide tube may be abutted against the bone and adjusted to the proper length or depth where it is desired to ream the hole. The reamer 90 is then inserted through the optional guide tube with the blades 114 and 116 in the retracted position, such as is shown in
In use, turning or rotating the turn wheel 96 relative to the barrel 102 causes the shaft 92 to be moved longitudinally relative to the shaft housing 104. This action causes the blades 114 and 116 to pivot around the pivot member 118 thereby expanding out from or retracting into the tapered ramps 119, as seen in
Once a reamed cavity is made, the blades 114 and 116 are retracted by rotating the turn wheel 96 in a direction opposite that which was used to expand the blades, until the blades 114 and 116 are fully retracted. However, it should be noted that unlike in the embodiment shown in
The surgeon may visualize the degree the blades 114 and 116 extend by viewing the position of the shaft 92 relative to the barrel 102, through view port 107. The shaft 92 may have markings or surface features to make such position determinations easier. In the embodiment shown, the surgeon can see how far down the shaft 92 moves as the turning wheel 96 is rotated. The reamer 90 may be calibrated to show the distance the blades project from the tool.
While this invention may be embodied in many different forms, there are shown in the drawings and described in detail herein specific preferred embodiments of the invention. The present disclosure is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiments illustrated.
This completes the description of the preferred and alternate embodiments of the invention. Those skilled in the art may recognize other equivalents to the specific embodiment described herein which equivalents are intended to be encompassed by the claims attached hereto.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1344327 *||20 Dec 1916||22 Jun 1920||Said William W Wilson||Underreamer|
|US1362513 *||19 Apr 1920||14 Dec 1920||Skinner Charles P||Underreamer|
|US3702611 *||23 Jun 1971||14 Nov 1972||Fishbein Meyer||Surgical expansive reamer for hip socket|
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|US5853054 *||31 Oct 1995||29 Dec 1998||Smith International, Inc.||2-Stage underreamer|
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|US6224604 *||30 Jul 1999||1 May 2001||Loubert Suddaby||Expandable orthopedic drill for vertebral interbody fusion techniques|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8906022||8 Mar 2011||9 Dec 2014||Conventus Orthopaedics, Inc.||Apparatus and methods for securing a bone implant|
|US8961518||19 Jan 2011||24 Feb 2015||Conventus Orthopaedics, Inc.||Apparatus and methods for bone access and cavity preparation|
|US9011443||20 Sep 2012||21 Apr 2015||Depuy Mitek, Llc||Low profile reamers and methods of use|
|US20110251616 *||13 Oct 2011||K2M, Inc.||Expandable reamer and method of use|
|U.S. Classification||606/80, 408/156|
|International Classification||A61B17/00, A61B17/16, A61B17/56|
|Cooperative Classification||A61B17/1671, A61B17/1617, A61B2017/00261, Y10T408/85843, Y10T408/8588|
|30 Nov 2006||AS||Assignment|
Owner name: MUSCULOSKELETAL TRANSPLANT FOUNDATION, INC., NEW J
Free format text: SECURITY AGREEMENT;ASSIGNOR:SPINEOLOGY, INC.;REEL/FRAME:018563/0350
Effective date: 20061130
|18 Dec 2006||AS||Assignment|
Owner name: SPINEOLOGY, INC., MINNESOTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KUSLICH, STEPHEN D.;PETERSON, FRANCIS;ROGSTAD, RODNEY;AND OTHERS;SIGNING DATES FROM 20061211 TO 20061212;REEL/FRAME:018648/0209
|5 Mar 2012||AS||Assignment|
Owner name: SPINEOLOGY, INC., MINNESOTA
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:MUSCULOSKELETAL TRANSPLANT FOUNDATION, INC.;REEL/FRAME:027805/0445
Effective date: 20120131
|13 Jul 2012||AS||Assignment|
Owner name: VENTURE BANK, MINNESOTA
Free format text: SECURITY AGREEMENT;ASSIGNOR:SPINEOLOGY INC.;REEL/FRAME:028550/0391
Effective date: 20120706
|7 Nov 2013||FPAY||Fee payment|
Year of fee payment: 12