Abstract:
An implant (10) for replacement of the proximal portion of a femur (12), and specifically for replacement of the natural femoral head is provided. The implant (10) includes a body member (14) for insertion, in use, through the natural femoral neck (8) and in substantial alignment therewith, a head member (16) with a spherical portion for engagement with a natural or a prosthetic hip socket, and an optional sleeve (18) for altering the position of the spherical portion of the head member (16), relative to the body member (14). The body member (14) may also include a collar (20) designed to rest on the resected surface of the remaining intact natural femoral neck (8). A member for joining the head member (16) to the body member (14) is further provided which may integrally join the head (16) and body (14) members or, where the implant (10) is comprised of modular components, the joining member may be in the form of a protrusion (26) or a recess (52) on the body member (14) for engaging a complementary recess (28) or protrusion (56), respectively, on the head member (16).
Abstract:
Modulares Gelenkprothesensystem, bestehend aus einem Prothesenschaft (11) mit einem Hals (10) und einem Außenkonus (9); einem ersten Zwischenelement (4), das zwischen dem Außenkonus (9) des Prothesenschafts und dem Innenkonus (2) der Gelenkkugel (1) einfügbar ist, wobei das erste Zwischenelement einen Außenkonus (3), der dem Innenkonus der Gelenkkugel angepasst ist und einen Innenkonus (5) aufweist, und wobei der Außenkonus und der Innenkonus des ersten Zwischenelements nicht koaxial angeordnet sind, bei dem der Innenkonus des ersten Zwischenelements dem Außenkonus eines zweiten Zwischenelements (7) angepasst ist, und das zweite Zwischenelement einen Innenkonus (8) aufweist, der dem Außenkonus des Prothesenhalses angepasst ist, wobei die Achsen des Innenkonus und des Außenkonus des zweiten Zwischenelements ebenfalls nicht koaxial angeordnet sind.
Abstract:
An implantable modular orthopedic prosthesis, preferably for hip (10), knee (110) or shoulder (210) arthroplasty, is disclosed which consists of three components. A first component has an elongated stem (12, 112, 212) with a free end (14, 114, 214) configured to be situated within the intramedullary canal of a patient's bone, and an opposite end (16, 116, 216) having an articulating portion such as a Morse-tapered member (18, 118, 218). A second component (20, 120, 220) has another articulating portion which can also be a corresponding tapered member (22, 122, 222) that is matingly engageable with the articulating portion (18, 118, 218) of the first component (12, 112, 212). A third component (24, 124, 224) has a body (26, 126, 226) with a linearly-extruded channel (28, 128, 228) through which the articulating portions (18, 22) are adjustably received, wherein at least one of the first (12, 112, 212) and second (20, 120, 220) components is radially-expandable to pressure lock against an internal surface (30, 130, 230) of the channel (28, 128, 228) in a selected position and arrest the first (12, 112, 212), second (20, 120, 220) and third (24, 124, 224) components together as the articulating portions are fully engaged with one another.
Abstract:
A kit for producing a modular prosthesis (10) is provided, the kit including a first prosthesis member (12) having a cavity such as a bore (14) formed in it, and a clamp (30) releasably clamped in the cavity (14). The clamp (30), which may be a rod having an axial bore (32) through a portion of its length, is subjected to a stretching force to cause the diameter of the clamp (30) to be reduced enough so that the clamp (30) is received in the cavity (14). As the stimulus is withdrawn, the clamp (30) returns towards its initial configuration, and in so doing, expands against the walls of the cavity (14). A second prosthesis member (16) may be configured to receive a portion of the first member (12) such that expansion of the clamp (30) in the cavity (14) of the first member (12) concurrently causes that member (12) to expand into contact with the second member (16) to clamp the members (12, 16) together.
Abstract:
A kit for producing a modular prosthesis is provided, the kit including a first prosthesis member having a cavity such as a bore formed in it, and a clamp releasably clamped in the cavity. The clamp, which may be a rod having an axial bore through a portion of its length, is subjected to an external stimulus such as a stretching force to cause the diameter of the clamp to be reduced enough so that the clamp is received in the cavity. As the stimulus is withdrawn, the clamp returns toward its initial configuration, and in so doing, expands against the walls of the cavity. A second prosthesis member may be configured to receive a portion of the first member such that expansion of the clamp in the cavity of the first member concurrently causes that member to expand into contact with the second member to clamp the members together.
Abstract:
Femoral component (4) for a hip prosthesis, comprising a distal part (8) intended to be inserted into the medullary cavity (15) of the femur (16) of a patient, and a cervical part (11) which comprises or which can support a neck (12) at the end of which a spherical head (5) is placed or can be placed, characterized in that said distal part (8) and said cervical part (11) are made up of two separate pieces, in that said distal part (8) comprises, at its proximal end (9), an outgrowth forming a pivot (10), and in that said cervical part (11) comprises means for assembling the cervical part (11) on the pivot (10) of the distal part (8), maintaining the possibility of free relative rotation of the cervical part (11) around the pivot (10) after implantation of the prosthesis. Total hip prosthesis of which the femoral component is of the above type.
Abstract:
An instrument is disclosed for inserting a modular implant, the instrument comprising a first end and a second end, the first end having engagement means for engaging a stem component of the modular implant, the engagement means comprising separation means for separating a body component of the modular implant and the stem component from one another so as to permit rotational positioning of the body component and the stem component relative to one another.
Abstract:
A modular hip prosthesis (10), comprising: (a) a proximal segment (12) including a neck (20) lockingly engageable with a femoral head component and a male tapered portion (25); (b) a distal segment (16) having a proximal end (16a) and a distal tip (16b), the distal segment (16) further formed with a male tapered portion (43) adjacent the proximal end (16a) thereof; and (c) a metaphyseal segment (14) having a proximal end (14a) and a distal end (14b), the metaphyseal segment (14) preferably including a bone engaging outer surface portion, and further including an axial bore therethrough (27), the axial bore (27) including first (27a) and second (27c) female tapered portions formed adjacent the proximal (14a) and distal (14b) ends thereof, respectively. The first female tapered portion (27a) of the metaphyseal segment (14) is dimensionally configured to lockingly engage the male tapered portion of the proximal segment. The second female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion (43) of the distal segment (16). Optionally, a screw (18) dimensionally configured to pass through aligned bores (27) in the proximal (12), metaphyseal (14) and distal (16) segments is threadably engaged with a threaded bore (42) formed in the proximal end (16a) of the distal segment (16).
Abstract:
An implant (10) for replacement of the proximal portion of a femur (12), and specifically for replacement of the natural femoral head is provided. The implant (10) includes a body member (14) for insertion, in use, through the natural femoral neck (8) and in substantial alignment therewith, a head member (16) with a spherical portion for engagement with a natural or a prosthetic hip socket, and an optional sleeve (18) for altering the position of the spherical portion of the head member (16), relative to the body member (14). The body member (14) may also include a collar (20) designed to rest on the resected surface of the remaining intact natural femoral neck (8). A member for joining the head member (16) to the body member (14) is further provided which may integrally join the head (16) and body (14) members or, where the implant (10) is comprised of modular components, the joining member may be in the form of a protrusion (26) or a recess (52) on the body member (14) for engaging a complementary recess (28) or protrusion (56), respectively, on the head member (16).
Abstract:
An implantable modular orthopedic prosthesis (10, 110), preferably for hip (10) or knee (110) arthroplasty, is disclosed which consists of three components (12, 20, 24; 112, 120, 124). A first component has an elongated stern (12, 112) with a free end (14, 114), configured to be situated within the intramedullary canal of a patient's bone, and an opposite end (16, 116) having an articulating portion such as a Morse-tapered member (18, 118). A second component (20, 120) has another articulating portion which can also be a corresponding Morse-tapered member (22, 122) that is matingly engageable with the articulating portion (18, 118) of the first component (12, 112). A third component (24, 124) has a body (26, 126) with a linearly-extruded channel (28, 128) through which the articulating portions (18, 22; 118, 122) are adjustably received, wherein at least one of the components (12, 20; 112, 120) is radially-expansible (32, 132) to pressure lock against an internal surface (30, 130) of the channel (28, 128) in a selected position and arrest the first (12, 112), second (20, 120) and third (24, 124) components together as the articulating portions (18, 22; 118, 122) are fully engaged with one another. The present modular orthopedic implant (10, 110) functions as a unitary biomechanical structure and is easy to use, as it is interoperatively adjustable to fit minute variations in a patient's given anatomy, while minimizing the inventory of component sizes needed on hand during surgery.