WO2012113570A1 - Acetabular prosthesis - Google Patents

Acetabular prosthesis Download PDF

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Publication number
WO2012113570A1
WO2012113570A1 PCT/EP2012/000810 EP2012000810W WO2012113570A1 WO 2012113570 A1 WO2012113570 A1 WO 2012113570A1 EP 2012000810 W EP2012000810 W EP 2012000810W WO 2012113570 A1 WO2012113570 A1 WO 2012113570A1
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WO
Grant status
Application
Patent type
Prior art keywords
insert
shell
outer shell
axis
characterized
Prior art date
Application number
PCT/EP2012/000810
Other languages
German (de)
French (fr)
Inventor
Peter Copf
Original Assignee
Peter Copf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332Conically- or frustoconically-shaped protrusion and recess
    • A61F2002/30345Multiple conical connection, i.e. the protrusion and recess having several tapered sections of different complementary conicities
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30565Special structural features of bone or joint prostheses not otherwise provided for having spring elements
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/30772Apertures or holes, e.g. of circular cross section
    • A61F2002/30784Plurality of holes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/30841Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • A61F2002/30845Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes with cutting edges
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • A61F2002/3401Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
    • A61F2002/3403Polar aperture
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • A61F2002/3412Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
    • A61F2002/3425Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface the outer shell having non-meridian protrusions, e.g. fins or wings, located in planes inclined or perpendicular with respect to the equatorial plane
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • A61F2002/3429Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • A61F2002/3433Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line with cut-outs, e.g. for allowing escape of excess bone cement
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • A61F2002/3438Acetabular cups hollow, e.g. clearance between inner and outer shells
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • A61F2002/3479Cage-like shells, e.g. hemispherical outer shells made of meridian strips or wires connected to an equatorial strip, rim or wire
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00011Metals or alloys
    • A61F2310/00023Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00179Ceramics or ceramic-like structures

Abstract

The invention relates to an acetabular prosthesis that has an outer shell (2) which can be implanted into a pelvic bone (4) and in the interior of which an insert (1) is inserted, said insert having an inner recess (1c) that is semi-spherical at least in some regions. A joint ball of a femur implant can be inserted into said recess. The interior and the exterior of said insert (1) are designed in a tapering manner in the direction of a common axis (A), and at least some portions of the insert (1) can be moved into the outer shell (2) in the direction of said axis (A) such that the insert (1) increasingly engages the outer shell (2) in a form-fitting and/or force-fitting manner.

Description

Acetabular cup

The invention relates to an acetabular cup. In the prior art it is known to replace hip joints in patients with artificial prostheses.

Here, on the one hand are used in the prosthetic elements in a

Thigh bone (femur) are to be used, such prostheses are used, which have an upper joint ball, which is then fitted into a correspondingly shaped acetabular cup to prevent movement about the ball joint center, thus allowing that is, substantially the center of the joint ball of the femoral implant.

It is therefore known, corresponding to the femur

incorporate recesses to insert the stem of a femoral implant, as well as in the pelvic bone to provide a recess to place an acetabular cup into this recess inside. May together form acetabular cup and on the other hand, the joint ball of a femoral implant in effect an artificial hip joint is then on the one hand.

As problematic it is known that may result in such an artificial hip joint forces impressed that the individual

Prosthetic devices, be it solve the acetabular cup in the pelvic bone, or the femur implant in the femur by the forces, which can result in considerable problems which require also reoperations.

CONFIRMATION COPY It is therefore the object of the invention to provide a new acetabular cup which has force or shock-absorbing properties to possible damage due to excessive force effects between

to avoid joint ball and the acetabular prosthesis.

According to the invention this object is achieved by an acetabular cup of the type mentioned, which has an outer shell which can be implanted into a pelvic bone and in the interior of which an insert is used which has an at least partially semi-spherical inner recess into which used a joint ball of a femur implant is, the interior of the outer shell and the exterior of the insert are designed to taper in the direction of a common axis defined in such a way that the insert in this direction

aforementioned axis under increasing positive and / or frictional connection to the outer shell at least partially in the outer shell is in movable.

It is thus an essential basic idea of ​​the invention, a

no longer form acetabular cup as before in the prior art as a one-piece member, but to make this two-part design, wherein a mobility is given along a defined common axis between the two nested parts, the movement of which is arranged in the interior of the outer shell insert to the outer shell along said common direction relative undergoes an attenuation, so therefore not acting forces directly from a

Acetabular prosthesis is introduced into the surrounding pelvic bone, but before experienced a loss, so that such forces do not cause damage to the pelvic bone, in particular a recessed therein

not loosen the acetabular cup.

The damping is inventively achieved here by the fact that, for a

Movement of the inner insert in the direction of the aforementioned common axis in the outer shell in a positive and / or positive connection between the insert and the outer shell increases and therefore this increase in positive and / or frictional connection of a further movement in the same direction counteracts with increasingly in particular, this attenuation in the aforementioned axial direction is progressively formed.

The above-mentioned common axis may in this case be formed so that the center point of an inserted into the insert joint ball on this

common axis. Furthermore, it may be provided that the outer upper edge of the shell of the outer shell in total in a plane oriented perpendicularly located to the aforementioned common axis. This plane can, based on the outer shell form an equatorial plane. Within this equatorial plane of the outer upper edge of the outer shell reaches its maximum diameter.

In one embodiment of the invention, it may be provided that the insert, which is used for receiving a joint ball, at least contacted with its outer surface in a the tray rim of the outer shell region close to the inner surface of the interior of the outer shell regions, and in the basic tray the region close to the inner surface of the

The interior free system, in particular spaced.

There is thus the possibility to move the insert in the direction toward the base of the outer shell in the inner space, since the direction in the

common axis lying outer portion of the insert has no contact with the shell base of the outer shell and thus with an increase of the form and / or force fit in the cup area near the edge is movable.

For example, the form-fit connection may increase such that an axial movement in the direction into the interior of the outer shell between the

Insert and the interior surface contacted with the progress of the axial displacement increases. It may be provided that the outer shell of an elastic

having compliance and thus due to the elasticity in a decrease in the force acting in the direction of the common axis of the aforementioned moving into in the shell insert automatically in the opposite direction into a starting position without intermediate outer shell and insert

Power load is achieved, resets.

For this purpose it may be provided that the shell base of the outer shell in the direction of the aforementioned axis and / or obliquely / radially relative to the abovementioned axis is a relative to the shell edge of the outer shell more elastic

having compliance. In particular, for this is the shell edge may have an annular reinforcement.

In order to achieve an increasing in the aforementioned axial direction of positive and / or frictional connection between the outer shell and the insert, it can be provided in a possible embodiment is that the thickness of the taper of the interior of the outer shell and the exterior of the insert in the direction is increasingly the aforementioned axis, in particular in steps abruptly changing is increasingly.

This can be done in a possible embodiment, for example, such that the interior and / or exterior of the insert in a cross section in the direction of the aforementioned axis, in particular in a cross sectional plane containing the

aforementioned axis comprises, forming a concave polygon.

Accordingly, to take the angle between a respective straight line of the traverse member and the aforementioned common axis in the direction of the aforementioned common axis and toward the shell base. For the purposes of this training, therefore, the rejuvenation of

Interior and exterior surface of the insert in the aforementioned

Cross-sectional plane done in steps. In a development of the shell base of the outer shell may have a stop which limits the displaceability of the insert in the direction of the aforementioned common axis. Such a stop may for example be performed such that the shell base of the outer shell has a vertically arranged in a plane perpendicular to the aforesaid axis and annular facing the fitting projection in its interior.

This annular projection which forms the end stop of the axial displaceability, it can be opposed to a flat surface of the insert, which is oriented in a plane perpendicular to the common axis and thus parallel to a plane in which the annular protrusion is formed.

In a further development of the invention it can be provided that the outer shell instead of a closed shell mold having a plurality of apertures. Through these openings, the rigidity of the outer shell is reduced in favor of a higher elasticity so that a desired damping along the common axis can be achieved by the number and geometric configuration of the breakthroughs.

The geometric configuration of the openings can be made such in this case that webs are formed between the apertures, especially those webs which are opposite force is applied by the use of elastically flexible. The embodiments may be selected such that at least some of the ridges formed the aforementioned axis intersecting shell circumferential direction are arranged at least partially in a.

In a further preferred embodiment, it may be provided that, at least some, preferably all of the aforementioned axis intersecting shell circumferentially disposed ridges on the outer side shell comprise outwardly extending projections. These projections, which preferably lie with their outer radial end outside of an imaginary ball shell surface which is defined by the upper outer edge of the shell can therefore be provided for in the

engage a bone material provided in the pelvic bone recess for receiving the outer shell.

For example, the configuration may be such that a part-spherical shell-shaped recess is introduced into the pelvic bone, having a radius the center of the partial sphere, which corresponds to the radius of the outer shell upper edge of the outer shell.

Upon insertion of the outer shell in such a bony cavity, therefore, the externally arranged on the webs aforementioned projections which extend radially outwardly into the bone material of the pelvic bone and fix thereby grip the outer shell of the

The acetabular cup according to the invention.

It may be preferred that the outwardly

taper extending projections also in the outward direction and thus form the tips or if the protrusions have an extension in the direction of the ridges that form arcuate cutting edges which cut then upon insertion of the outer shell in a bony cavity in the bone, so that by the projections or preferably in the form arcuate cutting a rotational retardation of the outer shell is formed about the aforementioned common axis.

Based on the choice of material, it may be provided to select a very hard resistant material for the insert within the outer shell, which in conjunction with an introduced in the use of the joint ball, the sliding rotation allows to the joint center, without any wear on the contacting surfaces to generate between joint ball and the inner surface of the insert. This may for example be provided to form the use of sapphire or alternatively of a ceramic.

The outer shell may be selected from a relation to the material of the insert softer material, for example of a titanium alloy. Thus, for a particularly lightweight outer shells as well as stable

Outer shells having elasticity can be obtained.

The edge of the shell can be used in the inventive acetabular prosthesis in various strengths. For example, a set can be used from a plurality of such inventive Hüftpfannenprothesen from which a physician selects according to the required thickness of the shell edge, a suitable acetabular prosthesis according to the invention for implantation. For example, the edge of the shell may be formed with different thicknesses in relation to its extent perpendicular to the aforementioned axis.

In particular, if the outer shell comprises the above-mentioned openings, an annular edge of the shell can be formed by the presence of the openings, from which may extend the above-mentioned webs, particularly in the circumferential direction of the shell. Such an annular edge of the shell may be in different ring thicknesses and ring cross-sections are available.

By choosing among such various inventive

can Hüftpfannenprothesen the acetabular prosthesis be individually adapted to the patient, eg in terms of its body weight, intended sporting activities or other criteria. In general, by selection under various strong shell rims or annular cross-sections, the required or desired damping behavior of the invention

Acetabular prosthesis are chosen because of different

Shell edge strength, the force varies with the insert by the edge

is wrapped. An embodiment of the invention is in the following figures

described. Show it:

Figure 1 an acetabular cup according to the invention in a

Cross-section along the common direction

Figure 2 is a view of the inside of the outer shell in the direction of the common axis

3 shows a view on the outside along the common axis

1 shows an acetabular cup according to the invention with an outer shell 2, in which an insert is inserted 1, wherein the overall arrangement of this acetabular cup is placed in an adapted to the outer side of the outer shell recess 3 in a pelvic bone. 4

The presentation of Figure 1 in a cross section, the common, aforementioned axis A is arranged in the cross-sectional plane, shows that both the outside of the insert 1 and the inner surface of the outer shell 2 in the direction of the common axis, which here within the considered

Paper plane and is symbolized by the axis A, are each tapered, the outer surface of the insert 1 as well as the inner surface of the outer shell 2 in this cross-section in each case at least partially form a concave polygon, so that the in an area close shell edge 2a of the outer shell 2 to a

A common axis extending contact zone 5 results in which contact the outer surface of the insert 1 and the inner surface of the outer shell. 2 In the basic tray 2b near the area and thus in an area in direction of the axis A in the interior of the outer shell 2 into the outer surface of the insert 1 and the inner surface of the outer shell, however, are 2 to each other without contacting or spaced apart. It is therefore apparent that in the direction of said defined common axis A of the insert 1 is due to the contact freedom of the insert 1 to the shell base of the outer shell 2 in the outer shell movable into, and due to the tapered formation between the outer surface of the insert 1 and the inner surface of the outer shell 2 of the positive and / or frictional connection between the insert 1 and the outer shell 2 at a movement of the insert 1 to the basic tray 2b is increasingly in the upper shell region near the edge 5 with mutually corresponding surface formations tapered shape can be seen.

The respect to the outer shell 2 stable configured insert 1 thus pushes during a movement in the direction of the axis A of the shell base 2b, the outer, contrast elastically formed shell back, so that it has for the axial movement of the insert a damping force. This force increases with increasing axial range of motion along the axis A.

Recognizable on the shell base, an annular projection 2b 2c, wherein the ring is arranged in a plane perpendicular to the axis A and parallel to the annular plane surface 1 b opposite to the insert. 1 Consequently, this ring 6 forms an end stop which limits the maximum axial range of motion of the insert. 1

This can also be provided at the movement limiting that the first system-free in the axial direction and in a direction of movement to the bowl basal surface portions of insert 1 and the outer shell 2 from contacting each other and thus also limit the axial movement range.

Alternatively, this region can also remain always plant free.

1 shows in section continue in that the insert 1 has an opening formed about the common axis A recess 1c is configured in part-spherical at least in its side facing the basic tray deep region, so that this recess can receive a joint ball of a femoral implant and with this joint ball together constituting an artificial hip joint, which is rotatable about a center of the joint ball, which lies on the common axis a.

The center of the ball joint is thus in the present invention

Acetabular cup shown along the axis A and slidable damped movable. It is so with the present invention

Acetabular cup, the ability to absorb acting in the joint forces, thus absorbing gently, without destructive

Effect is feared to the connection between the prosthetic element and the surrounding bone mass.

2 shows a plan view in the inside of the outer shell 2 of the

The acetabular cup according to the invention with omission of the insert 1. Recognizable in this plan view, the outer upper edge portion 2a of the outer shell 2, which is here parallel to the plane of the paper and thus may 2a in a plane perpendicular to the common axis A of the figure 1. The edge thus lying in an equatorial plane of an imaginary spherical surface formed by the outer diameter 2a 'of the rim.

The shell edge 2a can - as described in the general part - in

be selectable different strengths. Here, the edge of the shell 2a is formed substantially annular in Figure 2, so that in this example, to the extension of the axis A, or generally of the ring cross section in a plane parallel to the axis A may vary depending on the requirements, the thickness D of the ring vertically.

In the view of the interior of the outer shell, it is seen that the Schaleninnen- or outer surface has openings 7, wherein by the

Plurality of the openings 7 and their geometric arrangement of a plurality of ridges are formed 8 and 9, the webs 8 are oriented in a circumferential direction of the outer shell in which these circumferential direction, the axis A intersects. Relative to an imaginary spherical surface around the axis A. The webs are thus essentially in the direction of longitude in a spherical coordinate system.

In the figure 2 it is also apparent that the inner surface of this outer shell is tapered in steps in the direction of the shell base, namely here at the steps 10 and the first Through these steps is generated with reference to Figure 1 of the polygon in section.

In a region between the upper edge 2a and the first stage 10 according to the invention, a contact area between the outer surface of a

Insert 1 and the inner surface of the outer shell 2 is formed. Due to the given toward the shell base rejuvenation, which may be rotationally symmetrical about the axis A, the form and force closure between the insert and outer shell increases during a movement towards the shell base.

2 shows in the plan view of the shell formed on the base shell base annular projection 2c which is located a given about the common axis A opening in the shell bottom.

Figure 2 further shows that at least on the ridges 8 which extend in a circumferential direction which intersects the axis A, are disposed radially outwardly tapered projections 12, the same in the

may extend circumferentially and thus arcuate cutting

can form. This cutting grip into the bone material, therefore, an adapted to the outer shape of the shell 2 recesses in a

Pelvic bone, and produce an inhibition around the rotation axis A, so that the outer shell 2 may be implanted rotationally fixed in the pelvic bone.

3 shows a view of the same shell 2 from the outside, the extending in the circumferential direction cutting edges 12 are also visible here. The outer upper edge 2a defined herein with respect to the outer shell of a maximum outer spherical diameter of the entire outer dimension of the tray 2 is limited to the projections 12 on the webs. 8

The apertures 7 are in the embodiment of the present invention

Acetabular cup also advantageous insofar as that in this

Breakthroughs can grow bone mass and may surround the webs.

Especially the the basic tray near distance range between the outer surface of the insert 1 and the inner surface of the outer shell 2 allows such bone ingrowth, thus to secure the acetabular cup according to the invention after an appropriate Einwachszeit in the direction of the common axis A and integral with the connect bones.

To make this possible, it may be provided that in the direction of the axis A of the annular protrusion having such a large survey with respect to the shell base 2b and the axial range of motion of the insert 1 is limited in such a way that even in a stop position between the insert and surface of the ring stands distance range remains between the insert 1 and the shell base 2b, so that this distance area for the ingrowth of bone material available without that this ingrowth limits the axial movement of the insert width.

Claims

claims
1. An acetabular cup prosthesis, characterized in that it comprises a
outer shell (2), which in a pelvic bone (4) is implantable and in the interior of which an insert (1) is used, a
comprises at least partially semi-spherical inner recess (1c) into which a joint ball of a femoral implant can be inserted, wherein the interior and exterior of the insert (1) in the direction of a common axis (A) are tapered, and the insert (1) in the direction this axis (A) under increasing form and / or force fit at least partially into the outer shell (2) is movable in the outer shell (2).
2. A prosthesis according to claim 1, characterized in that the insert (1) with its outer surface in a the tray rim (2a), the region close to the outer shell (2) at least partially contacts the inner surface of the interior, and (in the dish base 2b ) region close to the inner surface of the interior without contacting,
is in particular spaced.
3. A prosthesis according to any one of the preceding claims, characterized
in that the shell base (2b) of the outer shell (2) in the direction of the aforementioned axis (A) and / or obliquely / radially relative to the abovementioned axis (A) relative to the shell edge (2a) has larger elastic resilience.
4. A prosthesis according to any one of the preceding claims, characterized
in that the thickness of the taper of the interior and exterior of the insert (1) in the direction of said axis (A)
is increasing, in particular such that the interior and / or exterior of the insert (1) (A) forms a concave polygon in a cross section in the direction of the aforementioned axis.
5. A prosthesis according to any one of the preceding claims, characterized
in that the shell base (2b) of the outer shell (2) comprises in a plane perpendicular to the aforementioned axis (A) disposed annular projection facing the insert (2c),
in particular, limits the length of the axial displacement of the insert (1).
6. A prosthesis according to any one of the preceding claims, characterized
in that the outer shell (2) a plurality of
having openings (7).
7. A prosthesis according to claim 6, characterized in that between the perforations webs (8.9) are designed, in particular, which are compared to a force applied by the use of elastically flexible.
8. A prosthesis according to claim 6 or 7, characterized in that
intersecting at least some of the webs (8) of the webs formed (8,9) at least partially in a the aforementioned axis (A)
Shell circumferential direction are arranged.
9. A prosthesis according to claim 8, characterized in that at least some, preferably all of the aforementioned axis (A) intersecting shell circumferentially disposed webs (8) on the
Shell outside of outwardly extending projections (12), in particular the taper outwards.
10. A prosthesis according to claim 9, characterized in that
Projections (12), in particular by the projections (12) formed arcuate cutting edges (12), upon insertion of the outer shell (2) cut into a bony cavity in the bone substance and a rotation locking of the outer shell (2) about said axis (A) produce.
1 1.Prothese according to any one of the preceding claims, characterized
in that the insert (1) made of sapphire is formed, and the outer shell (2) made of a titanium alloy.
12. Set comprising a plurality of acetabular cup according to any one of the preceding claims, characterized in that the plurality of acetabular cup to different extents formed
Shell edges (2a) have, in particular the respective shell edges (2a) are annular with various annular cross-sections perpendicular to the ring plane.
PCT/EP2012/000810 2011-02-25 2012-02-24 Acetabular prosthesis WO2012113570A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE201110012310 DE102011012310A1 (en) 2011-02-25 2011-02-25 Acetabular cup
DE102011012310.5 2011-02-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120712059 EP2677968A1 (en) 2011-02-25 2012-02-24 Acetabular prosthesis

Publications (1)

Publication Number Publication Date
WO2012113570A1 true true WO2012113570A1 (en) 2012-08-30

Family

ID=45929482

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/000810 WO2012113570A1 (en) 2011-02-25 2012-02-24 Acetabular prosthesis

Country Status (3)

Country Link
EP (1) EP2677968A1 (en)
DE (1) DE102011012310A1 (en)
WO (1) WO2012113570A1 (en)

Citations (5)

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DE2314708A1 (en) * 1973-03-24 1974-10-03 Joachim Prof Dr Med Eichler hip Replacement
US5824107A (en) * 1993-08-09 1998-10-20 Tschirren; Ernst Prosthetic joint cup and insert therefor
US6537321B1 (en) * 1996-11-21 2003-03-25 Plus Endoprothetik Ag Joint base for a hip joint endoprosthesis
US20060217815A1 (en) * 2002-09-24 2006-09-28 Biomet Manufacturing Corp Modular prosthetic head having a flat portion to be implanted into a constrained liner
DE102008047627A1 (en) * 2008-08-01 2010-02-04 Smith & Nephew Orthopaedics Ag Positioning in the form of a self-fixing trial acetabulum

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Publication number Priority date Publication date Assignee Title
DE4402675A1 (en) * 1993-11-26 1995-06-01 Cerasiv Gmbh Conical acetabulum without self-locking
FR2735356B1 (en) * 1995-06-16 1997-11-28 Tornier Sa acetabular implant intended in particular to the joint cavity iliac
DE19701536A1 (en) * 1996-08-24 1998-02-26 Cerasiv Gmbh joint prosthesis
DE19654409C5 (en) * 1996-12-24 2004-04-29 Ceramtec Ag Innovative Ceramic Engineering acetabulum
DE102005027427A1 (en) * 2005-06-14 2006-12-28 Mathys Ag Bettlach Hip endoprosthesis with modular joint socket
DE102007031667A1 (en) * 2006-08-04 2008-02-14 Ceramtec Ag Innovative Ceramic Engineering Insertion of the vibration-damping elements in prosthetic systems for the manipulation and damping of the natural frequencies
US9820854B2 (en) * 2010-04-30 2017-11-21 Ceramtec Gmbh Increasing the breaking load of ceramic cup inserts for hip joint prostheses by a defined back side collision of the cup insert and acetabular cup

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2314708A1 (en) * 1973-03-24 1974-10-03 Joachim Prof Dr Med Eichler hip Replacement
US5824107A (en) * 1993-08-09 1998-10-20 Tschirren; Ernst Prosthetic joint cup and insert therefor
US6537321B1 (en) * 1996-11-21 2003-03-25 Plus Endoprothetik Ag Joint base for a hip joint endoprosthesis
US20060217815A1 (en) * 2002-09-24 2006-09-28 Biomet Manufacturing Corp Modular prosthetic head having a flat portion to be implanted into a constrained liner
DE102008047627A1 (en) * 2008-08-01 2010-02-04 Smith & Nephew Orthopaedics Ag Positioning in the form of a self-fixing trial acetabulum

Non-Patent Citations (1)

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Title
None

Also Published As

Publication number Publication date Type
DE102011012310A1 (en) 2012-08-30 application
EP2677968A1 (en) 2014-01-01 application

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