Astra Aktiebolag

Astra Tech Ab

Astrazeneca Ab

Aktiebolaget Astra

Lars Valter Carlsson

Stig Gosta Wennberg

Magnus Jacobsson

Bjorn Albrektsson

Tord Valter Rostlund

Bj&ouml;rn Albrektsson

Tord R&ouml;stlund

Tomas Albrektsson

Warren MacDonald

Carl Magnus Jacobsson

Björn Albrektsson

Tord Röstlund

Thomas Albrektsson

Warren Macdonald

The invention provides a prosthesis structure for anchorage to the joint end of an articulatory part of a joint in a human or animal body which comprises an engagement element which presents a flat or a substantially flat engagement surface for engaging with a complementary joint end surface provided at the joint end and an elongate fixture connected to and spaced from the engagement surface for insertion into a complementary bore provided at the joint end at a distance from the joint end surface. The invention further provides that the elongate fixture forms an acute angle with the engagement surface.

Method of anchoring a prosthesis structure

A femur fixture for a hip-joint prosthesis comprising an intraosseous anchoring structure of a generally circular cross-section for screwing laterally into a complementary bore drilled laterally into the neck of a femur after resection of the femur head to an anchored position. The intraosseous anchoring structure has a proximal end, a distal end, a relatively short frusto-conical proximal section at the proximal end, and a proximal cylindrical section having a screw thread profile thereon. The proximal cylindrical section extends from the frusto-conical proximal section towards the distal end of the anchoring structure. The frusto-conical proximal section and the proximal cylindrical section each being dimensioned so as to bear against the cortex of the femur neck when the intraosseous anchoring structure is in the anchored position. The invention also relates to a set of such femur fixtures, wherein the frusto-conical proximal section and the proximal cylindrical section of each fixture in the set have different dimensions, whereby the fixture in the set having the frusto-conical proximal section and the proximal cylindrical section of correct size for abutting the cortex of the femur neck of a particular patient can be selected for use in that patient.

Femur fixture and set of femur fixtures

An implant ( ) for insertion into and permanent anchorage in bone tissue having an intraosseous anchoring structure ( ). The anchoring structure ( ) has a generally circular cross-section and comprises a first cylindrical section ( ) of a first diameter, a second cylindrical section ( ) of a second diameter less than the first diameter, said first and second cylindrical sections ( ) each being provided with a screw thread profile. The anchoring structure ( ) also comprises a tapered connecting section ( ) provided between an interconnecting said first and second cylindrical sections ( ).

Implant

The invention relates to a fixture for insertion into and permanent anchorage in a cavity ( ) formed in bone tissue. The fixture is made of a fixture member ( ), which has an insertion end surface ( ) and a cylindrical peripheral surface ( ) provided with screw threads, and a plurality of circumferentially-spaced cutting recesses ( ), which are formed in a forward, self-tapping end portion ( ) of the threaded peripheral surface ( ) adjacent to the insertion end surface ( ) and which open axially into the insertion end surface ( ). A plurality of circumferentially-spaced tissue-collecting and tissue-distributing grooves ( ) are formed in a rear, non-self-tapping portion ( ) of the threaded peripheral surface ( ). The grooves ( ) open radially outwards and extend at least partially in the longitudinal direction of the fixture member ( ), and each groove ( ) is, at a forward end thereof, connected to one of the cutting recesses ( ) for collecting cut-off bone material (B) circumferentially around the inner wall of the cavity ( ) during the insertion of the fixture.

Fixture and prosthesis including the same

The invention relates to a cutting guide instrument and method for enabling high-precision resection of the head (caput femoris) ( ) of the neck ( ) of a human femur (collum femoris) at a predetermined cutting angle (&agr; ) to the femoral shaft ( ) and on a predetermined cutting level (L ) with respect to the proximal end of the caput ( ). A support part ( ) is fixed to the femur during the resection. A longitudinal guide carrier ( ) is supported by the support part ( ) and is aligned along the femoral collum ( ) at said predetermined cutting angle (&agr; ) to the femoral shaft ( ). A cutting guide ( ) is supported by and movable along the axis (D&mdash;D) of the guide carrier ( ) to a cutting position corresponding to the predetermined cutting level (L ). The invention also relates to the use of the instrument for performing such resection.

Cutting guide instrument

Femoral fixture for a hip joint prosthesis

The invention is directed to a reamer for shaping a bone socket such as an acetabular cavity. The reamer comprises a cutting head for removing material from the socket during rotation of the cutting head. The cutting head comprises a number of relatively long main cutting edges, each of which extends in a direction from a base to a top of the reamer, and a number, higher than the number of main cutting edges, of relatively short peripheral cutting edges, which are located at the base and distributed at angulary spaced intervals about a rotational axis. The invention also provides a method for implanting a prosthesis component into a bone socket. During shaping of the bone socket, a top portion of the reamer is completely received in the bone socket to such an extent, that a cylindrical entrance portion is formed in the socket. The invention also provides a kit including a reamer and a prosthesis.

Bone reamer for sharping bone sockets or cavities during orthopaedic surgery

The invention relates to a prosthesis for uni-condylar or bi-condylar replacement of a joint in a human body and in particular to the tibia side of a knee joint. By means of an elongate fixture, a prosthetic plate is secured in position in a pre-prepared tibia portion and is allowed to heal, without further surgery being required. The invention also relates to a device for preparing the knee joint for prosthetic reception.

Joint prosthesis and apparatus for preparing the bone prior to fitting

Liner

Hip joint prosthesis

Reamer

Drill guide instrument

Hip joint prosthesis to be permanently anchored within a femur of a

The invention relates to a hip joint prosthesis comprising an attachment part for a ball unit (18) being designed to be anchored in the neck of a human femur (collum femoris), said attachment part, which is intended to be inserted into a channel (5, 14) extending through the femoral collum, being provided with parts for carrying a ball or caput (18) intended to be attached to the collum after removal of the head of the collum. The attachment part also comprises a fixture part comprising two main parts, a first part (1) which is to extend through a bore-hole (5) from the collum femoris towards the outer side of the femur and a second part (2) intended to fit into a cylindrical cavity cut into the cancellous bone of the collum.

Growing community of inventors

Kullavik, Sweden

Lars Valter Carlsson