DE19704577A1 - Manipulating instrument for bone-joint components - Google Patents

Abstract

The suction end of the handle (5) has a seal (6) forming an enclosed chamber (8) in conjunction with the surface (2) of the joint component (1). The handle also contains a mechanism (9,11) reducing the pressure in the chamber. The seal can consist of an elastomer ring, or a section of a cylindrical elastic tube. Its working edge can be formed by a flexible lip protruding outwards. An exhauster can be connected to the chamber via a pipe passing through the handle.

Description

The invention relates to a handling instrument for Joint components with joint surfaces.

When inserting artificial joints, for example of hip joints, usually with a kugeli Articulated inserts in the joint pans are used, which in turn are in the bone are anchored. The insertion takes place in the Press fit, and for this it is necessary that the joint sets exactly when inserting relative to the socket be oriented to prevent canting.

It is known to use devices on the joint inserts provide on which such handling instruments can attack, for example by positive locking or by a frictional connection. Such handha exercise instruments screwed into threaded recesses will.

However, all of these are known to handle instruments necessary, the joint inserts with  attacking devices for handling equip instruments. This complicates the structure of the Joint inserts and in some cases also leads to spatial difficulties as a place for such Attack devices are not always available.

These problems do not only arise during insertion of joint inserts, but generally when handling of joint components with joint surfaces. It can are also spherical rod ends, which at for example, must be attached to plug-in cones. Handling these is difficult, too there is a risk that the very precisely machined Ge steering surface is damaged when handling.

It is an object of the invention to provide a handling instrument of the generic type so that also Ge not specially adapted to the handling device steering components recorded and with the desired accuracy can be handled.

This task is performed with a handling instrument type described above ge according to the invention triggers that there is a handle part and an end of it Orderly suction element, which has a in itself closed, to the articular surface of the articular component sealingly put on and with this joint surface there through a closed suction chamber Sealing element as well as the pressure in the suction chamber lowering device includes.  

The handling instrument is thus with its one open and closed there by the sealing element Suction chamber directly on the joint surface of the joint component created and after closing the suction chamber through this articular surface thereby on the articular surface noted that the pressure in the suction chamber decreased becomes. The handling instrument is therefore to the Ge the steering surface is sucked in and holds the joint component un firmly fixed. In this position the joint comm component with the help of the handling instrument from one Removed packaging, to the desired surgical site le transported and with the required accuracy be positioned. By subsequently increasing the Pressure in the suction chamber, the connection can be like the solve, the attack of the handling instruments It is gentle on the joint surface and this in no way damage.

The sealing element can be made in different ways forms, it can be, for example, one Act elastomer ring or a cylindrical tube piece of elastically deformable material. Especially It is advantageous if the sealing element has a seal edge in the form of a self-contained, outward protruding, flexible sealing lip. In style of a suction cup puts this sealing lip on the Ge steering surface and ensures a safe Ver close the suction chamber.

In a preferred embodiment can be provided be that the sealing element and the the pressure in the Suction chamber lowering device together by one  flexible suction cup are formed. Such a suction cup encloses a suction chamber caused by deformation the volume of the suction cup can be changed, so that in a known manner inside the from Suction cup closed suction chamber a negative pressure can be fathered. A solution will be found in this case mechanically by overcoming the suction cup on the Articular surface holding suction power.

In any case, it can also be provided that the Suction chamber via a closable ventilation opening communicates with the environment. That’s it possible to consciously increase the pressure in the suction chamber and thereby the connection between handling instru ment and joint component to solve.

In another preferred embodiment is before seen that the suction chamber with a suction pump in Ver bond stands. It is particularly advantageous if the suction pump via a lead through the handle Suction line is connected to the suction chamber.

With the help of this suction pump, the pressure in the suction chamber can be specifically lowered and raised again, see above that thereby the connection between handling instru ment and joint component manufactured accordingly can be lifted again or later.

In a further preferred embodiment is before seen that the suction chamber with a piston-cylinder Unit is connected in which a abge in the cylinder seals displaceable piston divides a suction space,  whose volume corresponds to the position of the piston in the Cylinder is changeable. An increase in suction leads to a lowering of the pressure in the Suction chamber and thus for a firm suction of the handha exercise instrument on the joint component, vice versa can by moving the piston and downsizing of the suction chamber this connection can be released again.

It is advantageous if the piston by a Spring can be moved into an end position in which Volume of the suction space is maximum, this corresponds to the Holding position, because in this position the pressure in the suction chamber becomes minimal.

It is beneficial if the piston gets one out of the cylinder protruding operating handle so that the Pressure change in the suction chamber from one operator nungsperson by moving this handle fes can be made. In particular, the col ben-cylinder unit can be arranged in the handle part.

The following description of preferred embodiment forms of the invention is used in connection with the Drawing of the detailed explanation. Show it:

Fig. 1 is a longitudinal sectional view through a Ge steering socket and a hinge instrument held on a handling instrument in a handling instrument with a suction cup;

Fig. 2 is a longitudinal sectional view through a Ge steering socket, a joint insert and a handling instrument with piston-Cylin der-aggregate before attaching the hand handling instrument on the joint insert;

Fig. 3 is a longitudinal sectional view of the piston-cylinder unit of Figure 2 when to put on a joint insert.

Fig. 4 is a view similar to Figure 3 with suctioned handling instrument.

Fig. 5 is a view similar to Figure 4 for a handling instrument comprising a tube piece-shaped sealing element.

Fig. 6 is a view similar to FIG. 4 with an O-ring-shaped sealing element and

Fig. 7 use a handling instrument with Saugpum penanschluß in contact with a joint.

The invention is illustrated below using the example of a Ge Steering insert explained in a joint socket can be set. But it goes without saying that the He also for handling other joint components ten can be used on a joint surface have, for example spherical prosthetic heads.  

The handling instrument shown in the drawing is used to handle a joint insert 1 , which may consist of high-pressure polyethylene, for example, and which has a hemispherical joint surface 2 . Such a joint insert 1 is used in the implantation of an artificial joint in a hemispherical socket 3 , which in turn is anchored in the bone. The insertion can be done by screwing, in many cases, however, by a self-locking cone solution, in which the slightly conical outer joint insert 1 is pressed into a complementary recess in the socket 3 .

Before inserting the joint insert, it is also often necessary to insert test joint inserts into the socket 3 to check their position. These joint inserts must then be removed again from the joint socket, and such a handling instrument is also required for inserting and removing these sample joint inserts.

A first, particularly simple embodiment of a handling instrument 4 is shown in FIG. 1. This handling instrument 4 comprises a cylindrical handle part 5 , at one end a suction cup 6 made of flexible material is arranged, for example made of silicone. This suction cup 6 has an obliquely outwardly projecting, self-sealing lip 7 , which encloses a suction chamber 8 open towards the bottom. To produce a connection between the handling instrument 4 and the Gelenkein set 1 the sealing lip is applied to the joint surface 2 of the insert 1 joint 7 so that the suction chamber 8 is sealed to the outside. By further approaching the handling instrument 4 to the articulated surface 2 , the volume of the suction chamber 8 is further initially reduced while deforming the sealing lip 7 , but this approach is subsequently canceled, so that the volume of the suction chamber 8 is restored by the inherent elasticity of the suction cup material enlarged. This increase in the suction chamber volume 8 leads to a reduction in the pressure in the suction chamber 8 and thus to a suction of the suction cup 6 on the Ge steering surface 2nd This provides a secure connection between the handling instrument 4 and the joint insert 1 , in this state the joint insert 1 can be transported by means of the handling instrument 4 and inserted into the socket 3 .

To release this connection, it is sufficient to mechanically overcome the suction forces, that is to say when pulling the handling instrument 4 vigorously from the joint insert 1 , this connection is released again.

While in the embodiment of FIG. 1, the lowering of the pressure in the suction chamber by a Ver deformation of the suction cup 6 is carried out, is for this pressure change in the embodiment of FIGS. 2 through 4 a specific pressure reduction device vorgese hen.

The handling instrument 4 according to FIGS. 2 to 4 in order to summarize a cylindrical handle part 5 with a cylindrical interior 9 , in which a piston 11 is sealed by means of an O-ring 10 and is displaceable in a longitudinally displaceable manner. A handle 12 engaging the piston 11 protrudes from the handle part 5 , so that the piston 11 can be moved in the interior 9 by means of this handle 12 . On the piston 11 , a screw is supported benfeder 13 , which is arranged in the interior 9 and which moves the piston 11 into the extended position, in which the handle 12 protrudes the furthest from the handle part 5 .

The piston 11 separates from the interior 9 a suction chamber 14 with variable volume sealed by the O-ring 10 , which is connected via a flow channel 15 at the end of the handle part 5 to the suction chamber 8 surrounded by the suction cup 6 .

In order to connect this handling instrument 4 with the joint insert 1 , the sealing lip 7 of the suction cup 6 is first applied in a sealing manner to the joint surface 2 of the joint insert 1 in the same manner as in the exemplary embodiment in FIG. 1, so that the suction chamber 8 is closed. Subsequently, in the manner shown in FIG. 3, the piston 11 is moved against the screw benfeder 13 , so that the volume of the suction chamber 14 is minimized. If you then let go of the handle 12 , the piston 11 is pushed out of the interior 9 again by the helical spring 13 , so that the volume of the suction space 14 increases, and this leads to a lowering of the pressure in the suction space 14 via the flow channel 15 connected suction chamber 8 . The connection between the handling instrument 4 and the joint insert 1 is thereby established.

It can be easily solved again by pushing the piston 11 into the handle part 5 via the handle 12 against the action of the helical spring 13 .

In the embodiment of FIGS . 2 to 4, the suction chamber 8 is formed by a suction cup-shaped sealing element with an outwardly projecting sealing lip 7 .

In principle, it would also be possible to design this sealing element in a different way, for example in the form of a short tube 16 made of flexible material ( FIG. 5) or as an O-ring 17 made of elastomeric material ( FIG. 6). It is only essential that the suction chamber is sealed to the outside by contacting the handling instrument 4 on the steering surface 2 Ge. The hand habungsinstrumente FIG mutandis. 5 and 6 are otherwise constructed otherwise the same as the Handhabungsin instrument of FIGS. 3 and 4.

In the handling instrument of FIG. 3 to 6 it follows the lowering of the pressure in the suction chamber 8 by the displacement of the piston 11.

In a modified exemplary embodiment shown in FIG. 7, the grip part 5 has a flow channel 18 that completely penetrates it, into which a suction hose 19 opens at the end opposite the suction chamber 8 , which is connected to a suction pump (not shown in the drawing). The suction pump se generated via the flow channel 18 to ge desired vacuum in the suction chamber. 8

In this exemplary embodiment, the flow channel 18 is connected to the surroundings via a radial ventilation channel 20 in the grip part 5 . This ventilation channel 20 can be closed by a locking body 21 which is displaceable in the longitudinal direction on the handle part 5 . In normal detent operation, the ventilation duct 20 remains closed, but it can be opened by moving the closure body 21 to vent the flow duct 18 and thus also the suction chamber 8 , this leads to a solution of the connection between the handling instrument 4 and the joint insert 1 .

Such a ventilation device could also in the Use embodiments described above find.

Claims (12)

1. Handling instrument for joint components with Ge articulating surfaces, characterized in that it has a grip part ( 5 ) and a suction element arranged thereon at the end, which has a self-contained element, which can be applied sealingly to the articulated surface ( 2 ) of the articulated component ( 1 ) and with this Artificial surface ( 2 ) thereby comprises a sealed suction chamber ( 8 ) forming sealing element ( 6 ; 16 ; 17 ) and a device ( 6 ; 9 , 11 ; 18 , 19 ) lowering the pressure in the suction chamber ( 8 ). 2. Instrument according to claim 1, characterized in that the sealing element is an elastomer ring ( 17 ). 3. Instrument according to claim 1, characterized in that the sealing element is a cylindrical tube piece ( 16 ) made of elastically deformable material. 4. Instrument according to claim 1, characterized in that the sealing element ( 6 ) has a sealing edge in the form of a self-contained, projecting outward, the flexible sealing lip ( 7 ). 5. Instrument according to one of the preceding claims, characterized in that the suction chamber ( 8 ) is connected to the environment via a closable ventilation opening ( 20 ). 6. Instrument according to claim 1, characterized in that the sealing element and the pressure in the suction chamber ( 8 ) lowering device are formed jointly by egg nem flexible suction cup ( 6 ). 7. Instrument according to one of claims 1 to 5, characterized in that the suction chamber ( 8 ) is connected to a suction pump. 8. Instrument according to claim 7, characterized in that the suction pump is connected to the suction chamber ( 8 ) via a suction line ( 18 ) leading through the handle part ( 5 ). 9. Instrument according to one of claims 1 to 4, characterized in that the suction chamber ( 8 ) is connected to a piston-cylinder unit ( 9 , 11 ) in which a piston ( 11 ) sealed in the cylinder ( 9 ) is displaceable ) divides a suction chamber ( 14 ), the volume of which can be changed in accordance with the position of the piston ( 11 ) in the cylinder ( 9 ). 10. Instrument according to claim 9, characterized in that the piston ( 11 ) by a spring ( 13 ) is displaceable in an end position in which the volume of the suction chamber ( 14 ) is maximum. 11. Instrument according to claim 9 or 10, characterized in that the piston ( 11 ) carries a from the cylinder ( 9 ) protruding actuating handle ( 12 ). 12. Instrument according to one of claims 9 to 11, characterized in that the piston-cylinder unit ( 9 , 11 ) is arranged in the handle part ( 5 ).