US5211666A — Hip joint femoral component endoprosthesis with a…

Claim 1

Independent Claim 262 words

A femoral component of a hip endoprosthesis for implantation into the upper end of the medullary canal of a femur, said prosthesis comprising: a stem having a distal end, shaped and dimensioned for introduction into a medullary cavity of a femur, and a proximal end, said stem having a medial side on the side thereof intended to be adjacent to the medial side of the femur when in use and a lateral side on the side thereof intended to be adjacent to the lateral side of the femur when in use; a neck connected to and extending away from the proximal end of said stem, said neck being adapted to be connected to a head means for functioning as a femur head when in use; and a lateral support wedge integrally formed with or fixedly connected to said stem near the proximal end thereof, and being sized and shaped to extend the lateral side of said stem so as to form a lateral support surface which contacts the proximal lateral femoral cortex of the intertrochanteric region of the femur when in use, said lateral support surface forming an angle of 5°-20° with the midline of the distal portion of said stem and having a sufficient width to permit transfer of the force applied to the head means, when in use, onto the femur such that such contact will not damage the femur, said femoral component having no structure specifically designed to transfer load to the medial and central portions of the anterior and posterior intertrochanteric region of the femur when in use.

Claim 2

Dependent Claim 262 words

A femoral component of a hip endoprosthesis for implantation into the upper end of the medullary canal of a femur, said prosthesis comprising: a stem having a distal end, shaped and dimensioned for introduction into a medullary cavity of a femur, and a proximal end, said stem having a medial side on the side thereof intended to be adjacent to the medial side of the femur when in use and a lateral side on the side thereof intended to be adjacent to the lateral side of the femur when in use; a neck connected to and extending away from the proximal end of said stem, said neck being adapted to be connected to a head means for functioning as a femur head when in use; and a lateral support wedge integrally formed with or fixedly connected to said stem near the proximal end thereof, and being sized and shaped to extend the lateral side of said stem so as to form a lateral support surface which contacts the proximal lateral femoral cortex of the intertrochanteric region of the femur when in use, said lateral support surface forming an angle of 5°-20° with the midline of the distal portion of said stem and having a sufficient width to permit transfer of the force applied to the head means, when in use, onto the femur such that such contact will not damage the femur, said femoral component having no structure specifically designed to transfer load to the medial and central portions of the anterior and posterior intertrochanteric region of the femur when in use.

Claim 3

Dependent Claim 22 words

A femoral component in accordance with claim 1, wherein said lateral support wedge is integrally formed with said stem as one piece.

Claim 4

Dependent Claim 23 words

A femoral component in accordance with claim 1, wherein the anterior-posterior width of the lateral support surface is greater than about 8 mm.

Claim 5

Dependent Claim 21 words

A femoral component in accordance with claim 3, wherein the anterior-posterior width of the lateral support surface is about 10-30 mm.

Claim 6

Dependent Claim 23 words

A femoral component in accordance with claim 1, wherein said lateral support wedge is a separate component which is connected to said stem.

Claim 7

Dependent Claim 24 words

A femoral component in accordance with claim 5, wherein said lateral support wedge is connected to said stem by means of a male/female joint.

Claim 8

Dependent Claim 23 words

A femoral component in accordance with claim 5, wherein said lateral support wedge is connected to said stem by means of an adhesive.

Claim 9

Dependent Claim 19 words

A femoral component in accordance with claim 1, wherein said angle of the lateral support surface is about 10°-15°.

Claim 10

Dependent Claim 37 words

A femoral component in accordance with claim 1, wherein the medial-lateral breadth at the broadest point of the lateral support wedge is such that it extends the lateral surface of said stem by at least 10 mm.

Claim 11

Dependent Claim 48 words

A femoral component in accordance with claim 1, wherein said lateral support wedge is shaped such that the lateral support surface thereof is slightly rounded so as to approximate the radius of curvature of the proximal lateral femoral cortex with which it is in contact when in use.

Claim 12

Dependent Claim 22 words

A femoral component in accordance with claim 10, wherein said lateral support wedge is integrally formed with said stem in one piece.

Claim 13

Dependent Claim 97 words

In the method of inserting a femoral component of a hip prosthesis into the femur of a patient undergoing hip joint replacement, comprising placing the femoral component into the medullary canal of the femur, the improvement wherein said femoral component is a femoral component in accordance with claim 1 of a size selected so as to form a tight proximal fit in the medullary canal when downward force is applied, the lateral support surface of said wedge being in contact with the lateral cortex of the intertrochanteric region of the femur to transfer lateral loading forces thereto.

Claim 14

Independent Claim 21 words

A method in accordance with claims 12, wherein all lateral loading forces are transferred onto the upper third of the femur.

Claim 15

Dependent Claim 213 words

A femoral component of a hip endoprosthesis for implantation into the upper end of the medullary canal of a femur, said prosthesis comprising: a stem having a distal end, shaped and dimensioned for introduction into a medullary cavity of a femur, and a proximal end, said stem having a medial side on the side thereof intended to be adjacent to the medial side of the femur when in use and a lateral side on the side thereof intended to be adjacent to the lateral side of the femur when in use; a neck connected to and extending away from the proximal end of said stem, said neck being adapted to be connected to a head means for functioning as a femur head when in use; and a separate discrete lateral support wedge fixedly connected to said stem near the proximal end of said stem so as to extend the lateral side of said stem, when in use, so as to form a lateral support surface which contacts the proximal lateral femoral cortex in the intertrochanteric region of the femur, said lateral support surface having a sufficient width to permit transfer of the force applied to the head means, when in use, onto the femur such that such contact will not damage the femur.

Claim 16

Dependent Claim 213 words

A femoral component of a hip endoprosthesis for implantation into the upper end of the medullary canal of a femur, said prosthesis comprising: a stem having a distal end, shaped and dimensioned for introduction into a medullary cavity of a femur, and a proximal end, said stem having a medial side on the side thereof intended to be adjacent to the medial side of the femur when in use and a lateral side on the side thereof intended to be adjacent to the lateral side of the femur when in use; a neck connected to and extending away from the proximal end of said stem, said neck being adapted to be connected to a head means for functioning as a femur head when in use; and a separate discrete lateral support wedge fixedly connected to said stem near the proximal end of said stem so as to extend the lateral side of said stem, when in use, so as to form a lateral support surface which contacts the proximal lateral femoral cortex in the intertrochanteric region of the femur, said lateral support surface having a sufficient width to permit transfer of the force applied to the head means, when in use, onto the femur such that such contact will not damage the femur.

Claim 17

Dependent Claim 23 words

A femoral component in accordance with claim 14, wherein the anterior-posterior width of the lateral support surface is at least about 8 mm.

Claim 18

Dependent Claim 21 words

A femoral component in accordance with claim 15, wherein the anterior-posterior width of the lateral support surface is about 10-30 mm.

Claim 19

Dependent Claim 24 words

A femoral component in accordance with claim 14, wherein said lateral support wedge is connected to said stem by means of a male/female joint.

Claim 20

Dependent Claim 23 words

A femoral component in accordance with claim 14, wherein said lateral support wedge is connected to said stem by means of an adhesive.

Claim 21

Dependent Claim 28 words

A femoral component in accordance with claim 14, wherein said lateral support surface forms an angle of 5°-20° with the midline of the distal portion of the stem.

Claim 22

Dependent Claim 19 words

A femoral component in accordance with claim 19, wherein said angle of the lateral support surface is about 10°-15°.

Claim 23

Dependent Claim 48 words

A femoral component in accordance with claim 19, wherein the medial-lateral breadth of the lateral support wedge from the medial surface thereof in contact with the lateral surface of said stem to the lateral surface of said wedge at the widest point thereof is at least 10 mm.

Claim 24

Dependent Claim 48 words

A femoral component in accordance with claim 14, wherein the medial-lateral breadth of the lateral support wedge from the medial surface thereof in contact with the lateral surface of said stem to the lateral surface of said wedge at the widest point thereof is at least 10 mm.

Claim 25

Dependent Claim 106 words

A femoral component in accordance with claim 14, wherein said separate lateral support wedge is shaped such that the lateral support surface thereof is slightly rounded, said wedge having anterior-posterior side surfaces which bulge outwardly with respect to the anterior-posterior side surfaces of said stem, said anterior-posterior side surfaces of said wedge extending medially to form wings which overlap the lateral portion of the anterior-posterior side surfaces of said stem, the interior surface of said wings and the medial surface of said wedge which contacts the lateral surface of said stem having a shape which corresponds with the shape of the corresponding surfaces of said stem.

Claim 26

Dependent Claim 157 words

A lateral support wedge connectable to the proximal end of the stem of a femoral component of a hip endoprosthesis implantable into the upper end of the medullary canal of a femur, said wedge being shaped so as to extend the lateral side of the stem of the femoral component, when in use, so as to form a lateral support surface which contacts the proximal lateral femoral cortex of the intertrochanteric region of the femur, said lateral support surface forming an angle of 5°-20° with the midline of the distal portion of the stem when connected thereto and having a sufficient width to permit redistribution of the force applied to the femoral component, when in use, onto the femur such that such contact will not damage the femur, said wedge having no structure specifically designed to transfer load to the medial and central portions of the anterior and posterior intertrochanteric region of the femur when in use.

Claim 27

Dependent Claim 157 words

A lateral support wedge connectable to the proximal end of the stem of a femoral component of a hip endoprosthesis implantable into the upper end of the medullary canal of a femur, said wedge being shaped so as to extend the lateral side of the stem of the femoral component, when in use, so as to form a lateral support surface which contacts the proximal lateral femoral cortex of the intertrochanteric region of the femur, said lateral support surface forming an angle of 5°-20° with the midline of the distal portion of the stem when connected thereto and having a sufficient width to permit redistribution of the force applied to the femoral component, when in use, onto the femur such that such contact will not damage the femur, said wedge having no structure specifically designed to transfer load to the medial and central portions of the anterior and posterior intertrochanteric region of the femur when in use.

Claim 28

Dependent Claim 126 words

A lateral support wedge in accordance with claim 24, wherein said said wedge is shaped such that the lateral support surface thereof is slightly rounded and the anterior-posterior side surfaces thereof bulge outwardly with respect to the anterior-posterior side surfaces of the stem to which it is connectable, when in use, said anterior-posterior side surfaces of said wedge extending medially to form wings which overlap the lateral portion of the anterior-posterior side surfaces of the stem to which it is connectable, the interior surface of said wings and the medial surface of said wedge which contacts the lateral surface of the stem when in use having a shape which corresponds with the shape of the corresponding surfaces of the stem to which the wedge is connectable.

Claim 29

Dependent Claim 52 words

A lateral support wedge in accordance with claim 24, wherein the medial-lateral breadth of the lateral support wedge from the medial surface thereof in contact with the lateral surface of said stem, when in use, to the lateral surface of said wedge at the widest point thereof is at least 10 mm.

Claim 30

Dependent Claim 32 words

A lateral support wedge in accordance with claim 24, wherein said lateral support surface forms an angle of 10°-15° with the midline of the distal portion of the stem when connected thereto.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-05-17	1996-11-16	1997-05-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-05-17	2000-11-16	2001-05-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-05-17	2004-11-16	2005-05-18	$7700.00	Window Closed / Lapsed

Hip joint femoral component endoprosthesis with a lateral load-transferring support surface

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