DE2401482C2 - Thigh section for hip joint endoprostheses - Google Patents

Description

24 Ol 482

3 4

going to improve that a slight transition from one of the stanchions of the other half-socket part 7 bays, larger joint ball to a smaller joint ball The screw through holes 8 are to the outside Case of the transition from a partial prosthesis to a surface of the relevant half-socket part 7 in the case of a 9-he full prosthesis it is possible to widen the heads of fastening screws 10

According to the invention, this object can be taken up by FIG the characterizing part of claim 1 or the drilling of the other half-socket part 2 specified arrangement are loosened screwable. The screw through holes 8

The solution according to the invention thus brings the advantages at the joint plane of the relevant half-part that countersunk at the transition from a partial prosthesis to a socket part 7 to only accommodate the larger joint ball from the io tion of the fastening screws 10 to snap rings 11 to the full prosthesis.
Trunnion must be removed, which in turn The spherical cap part 6 can over the ball head

is designed as a smaller joint ball so that the 4 of the shaft 1 are snapped over and is then Assembly of a new joint ball! This is completely omitted due to the radial attachment of the two halves on both sides is with respect to the smaller joint ball of the muffenteiie 7 on the neck part 3, with their counter-profiles Thigh part according to the invention, sealing the top 15 into the circumferential groove 6c of the protruding part envisioned a desirable feature of one-piece engagement from the cap inner layer 6a, and through one-joint ball and shaft given. screw the fastening screws 10 securely and

An advantageous embodiment of the solution possible sealing on the neck part 3 and the ball head 4 according to claim 2 is the subject of the subordinate claim.
Proverbs 3. 20 in this assembled form aien * the upper

An embodiment of a leg part according to the invention as a partial replacement, the spherical outer hip joint prosthesis thigh part becomes the next surface of the metal outer layer of the cap part 6 Referring to the drawing, which shows a partially attached joint ball 5 with the natural Schematic of the hip joint socket of the prosthesis wearer, cut and partially pulled apart View shows described in more detail. 25 works

The hip joint endo shown in the drawing should then take place at a later point in time instead of the

The thigh part of the prosthesis has a shaft 1 with a partial replacement, a total replacement of the hip joint is necessary Medullary canal spur 2 and a trunnion adf, which are dig, is made by loosening the fastening screw a neck part 3 and a ball head 4 consists of ben 10, radial pulling off of the two half-sleeve parts 7 The medullary canal spur 2 tapers towards the image plane 30 and the cap part 6 is axially withdrawn from the spherical perpendicular Level towards its free end, wedge feed head 4, this spherical head is exposed whereupon on the pelvis. The thick end of the medullary canal spur is an artificial socket in one of the patient's bones The plane perpendicular to the plane of the picture is bent or fastened in such a way, the socket diameter of which corresponds to the cranked portion that the ball head 4 relative to the longitudinal axis of the knife of the ball head 4 of the already existing straight section of the medullary canal spur laterally compared to the thigh part.

The shaft just described is made in one piece. It may be desirable to have the attached joint device Metal body formed. ball 5 to be attached to the ball head 4 so that no

The thigh part shown also shows a mutual rotation between the joint ball and the kune releasably on the support pin of the shaft 1 fastening bracket head is possible. This can be done, for example rc joint ball 5, which in turn are reached from a hollow ball 40 that in the area of the circumferential groove 6c and ligen, the ball head 4 encompassing cap part 6 and the complementary counter-profiles of the two two roughly the same, the neck part 3 of the support pin around- half sleeve parts 7 coiling accordingly gripping half-sleeve parts 7 is made. The hollow sphere - flat surface areas are provided

ge cap part 6 is designed as a two-layer body

and has an inner layer 45 made of plastic. 1 sheet of drawings

6a and a thinner, metal outer

layer 66 on. The inner layer 6a protrudes axially at the cap mouth opening above the metal outer layer 66 and points at its protruding part
an outer circumferential groove 6c. 50

The radially inner surfaces of the two half-sleeve parts 7 are each complementary to the neck part 3 of the
Supporting pin and have at their ends facing the cap part 6 in each case a protruding part of the cap inner layer 6b and in particular 55
Eggs complementary profile to their circumferential groove 6c
on. The outer surface of the two half-sleeve parts 7 are
designed so that their ends facing the cap part 6 gently touch the spherical outer surface of the metal
Connect the outer layer 6b of the cap part 6 bo
and then run conically and slightly curved, tapering in the direction of the end of the neck part 3 facing the medullary canal spur 2.

One of the two half-sleeve parts 7 has two mutually parallel, perpendicular to the joint plane of the two 65
Half-socket parts running screw through-bores, which are connected with two parallel threaded holes running perpendicular to the parting line.

Claims (3)

24 Ol 482 1 2 of the necessarily smaller diameter of the claims: artificial Kugelgclenkpfanne must have a smaller diameter. 1.Thigh part for hip joint endoprothes - FQr the thigh part of a hip joint endoprosis, the shaft of which has a medullary canal spur and a thesis are basically one-piece constructions thus one-piece support pin for a preferred in which the shaft or medullary canal spur and releasably detachably placed thereon and formed in one piece with one another against relative joint ball. Rotation secured joint ball has, that this naturally results from the fact that in a cinteidurch characterized in that the trunnion leagues, made entirely of Metail construction in turn in an io of the mechanically heavily stressed thigh part that can be used as a joint ball Ball head (4) ends, and compared to the bearing the required metallurgical properties, such as pin sealed joint ball (5) as a hollow ball, for example fatigue and corrosion resistant The cap is as close as possible to reach with an ability to encompass the ball head. Inner layer (6a) made of plastic and a metal With frequent use of the partial replacement has nen outer layer (6ty is formed 15 is unfortunately shown that the cases in which 2nd thigh section for hip joint endoprosthesis - due to the gradual wear and tear of the natural hips, the shaft of which has a medullary canal spur and a joint socket in the course of time a total replacement so that one-piece support pin must be made for one. In this case, the removable detachable attached, against relative blem occurs that the joint ball of the patient earlier Has rotation secured joint ball, thereby 20 thighs already implanted as a partial replacement that the trunnion in turn is partially separated by an artificial socket joint Geienkkugei usable ball head (4) agreed Geienkkugei of smaller diameter replaced ends, and that the opposite to the trunnion must be ab-, which is usually used with the sealed detachable joint ball (5) made of a one-piece thigh parts that prevent unpleasant condensation Ball head (4) of the trunnion encompassing 25 sequence that the whole thigh part again hollow spherical cap part (6) and two necks can be removed and replaced by another part (3) of the trunnion encompassing and the cap must. pen part holding half sleeve parts (7). From US-PS 31 02 536, the subject of which 3. thigh part according to claim 2, characterized by the preamble of claim I, a thigh indicates that the cap part (6) is a metal 30 kelteil known for hip joint endoprostheses, with wel-outer layer (6b) and one made of plastic The Geienkkugei does not have one piece with the shaft de inner layer (6a) , which is formed in the area of the, but detachable and thus exchangeable on the cap mouth opening>"Jig can be exposed once via the metal support pin of the shaft The joint ball has different sizes, the size of which is to be exchanged on the plastic part . parts to one another by means of releasable connecting means (10). 40 exchangeability of Geienkugei was sacrificed. Per- However, the later exchange appears blcmalisch a larger ball against a smaller ball after years of use of the planted The invention relates to a thigh part for hip thigh part insofar as after this time joint endoprostheses, the shaft of which has a medullary canal 45 due to adhesions the loosening of the connecting means spur and a thus integrally formed Tragzap- and removing the original Geienkkugei the for a detachable, detachable attachment against the risk of damaging the shank cable Relative rotation secured joint ball has transmission means is given, so that under certain circumstances a Hip joint endoprostheses can either be used as a flawless replacement for a new pair of joints Partial replacement or total replacement of the natural hip is no longer guaranteed. Find joint application, depending on the state of the Also from DE-AS 20 59 381 it is known a natural acetabulum. In the case of a partial replacement of a joint ball, it can be exchanged on a support pin of a only the natural head of the thigh is placed on the shaft. While the US thigh discussed above Replaces attached prosthesis part, while PS 3 t 02 536 the detachable attachment of the joint ball rend the natural acetabulum continues to be used ss on a trunnion mainly because will. In the case of a total replacement, on the other hand, the number is also an individual selection of a size-based one in each case Hip joint socket with an artificial Geienkkugei and an individual Polenk socket replaced. sitioning this joint ball on the trunnion too In both cases this is to be attached to the thigh, DE-AS 20 59 381 deals specifically with the lowering prosthesis part in its basic structure 50 with the replacement of a larger Geienkkugei according to the same and has a medullary canal spur for attaching a l'arlialersalz to a smaller one Gclcnkkiigcl in the thigh bone and, on the other hand, a joint ball arranged offset since the transition to a total crystal / of the hip joint. The latter publication suggests, however, that the Tragger difference is to the extent that a pin is conical in shape and the joint ball with a larger diameter is provided with a corresponding partial substitute for the interaction with the natural conical bore. to put on this conical pin,
The invention is based on the object of providing an obcrwi'lch lcl / .tcrem ΙίιΙΙι ιι