Composite femoral implant having increased neck strength
First Claim
Patent Images
1. A femoral implant for a hip prosthesis comprising:
- a shaft oriented in a longitudinal direction;
a neck extending from said shaft at an acute angle θ
to the longitudinal direction;
said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer;
wherein at least 50% of said fibers of the implant are oriented in the θ
direction and the remainder of said fibers of the implant are oriented in directions other than the θ
angle.
15 Assignments
0 Petitions
Accused Products
Abstract
A femoral implant for a hip prosthesis includes a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction. The implant includes a plurality of layers of fibers in a matrix, wherein the fibers are substantially unidirectional in each respective layer. The implant is made from a stack of layers of the matrix so that the direction of fibers is unbalanced. At least 50% of the fibers are oriented in the θ direction and the remainder of said fibers are oriented in directions other than the θ angle.
74 Citations
55 Claims
-
1. A femoral implant for a hip prosthesis comprising:
a shaft oriented in a longitudinal direction;
a neck extending from said shaft at an acute angle θ
to the longitudinal direction;
said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer;
wherein at least 50% of said fibers of the implant are oriented in the θ
direction and the remainder of said fibers of the implant are oriented in directions other than the θ
angle.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
26. A femoral implant for a hip prosthesis comprising:
a shaft oriented in a longitudinal-direction and a neck extending from said shaft at an acute angle θ
to the longitudinal direction;
wherein said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; and
wherein more of said fibers of the implant are oriented in the θ
direction than are fibers of the implant oriented in directions other than the θ
angle.- View Dependent Claims (27, 28, 29)
-
30. A femoral implant for a hip prosthesis comprising:
- a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
to the longitudinal direction;
wherein said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; and
wherein more of said layers contain fibers oriented in the θ
direction than said layers contain fibers oriented in the shaft direction. - View Dependent Claims (31, 32)
- a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
-
33. A method of making a femoral implant for a hip prosthesis having a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
- to said longitudinal direction comprising the steps of;
forming a plurality of individual layers of substantially unidirectional fibers in a matrix;
stacking said layers such that at least 50% of said fibers of the implant are oriented at said angle θ and
the remainder are oriented in directions other than the θ
angle;
heating the stacked layers under pressure to melt said matrix;
cooling said matrix to form a composite block; and
machining said stacked layers into the form of the implant. - View Dependent Claims (34, 35)
- to said longitudinal direction comprising the steps of;
-
36. A method of performing hip-joint replacement surgery comprising implanting a femoral implant comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
- to the longitudinal direction;
wherein said implant comprises a plurality of layers of fibers in a matrix wherein said fibers are unidirectional in each respective layer; and
wherein at least 50% of said layers have fibers oriented in the θ
direction and the remainder of said layers have fibers oriented in directions other than the θ
angle. - View Dependent Claims (37, 38)
- to the longitudinal direction;
-
39. A femoral implant for a hip prosthesis comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
- to the longitudinal direction;
wherein said implant comprises a plurality of layers of fibers in a matrix, and said fibers are substantially unidirectional in each respective layer; and
wherein at least 50% of the layers have fibers oriented in the θ
direction and the remainder of the layers have fibers oriented in directions other than the θ
angle. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
- to the longitudinal direction;
-
48. A method of making a femoral implant for hip prosthesis having a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
- to said longitudinal direction comprising the steps of;
forming a plurality of individual layers of substantially unidirectional fibers in a matrix;
stacking the layers such that at least 50% of the layers have fibers oriented in the θ
direction and the remainder of the layers have fibers oriented in directions other than the θ
angle;
heating the stacked layers under pressure to melt said matrix;
cooling said matrix to form a composite block; and
machining said stacked layers into the form of the implant. - View Dependent Claims (49, 50, 51, 52, 53, 54)
- to said longitudinal direction comprising the steps of;
-
55. A method of performing hip-joint replacement surgery comprising implanting a femoral implant comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ
- to the longitudinal direction;
wherein said implant comprises a plurality of layers of fibers in a matrix and said fibers are unidirectional in each respective layer; and
wherein at least 50% of said layers have fibers oriented in the θ
direction and the remainder of said layers have fibers oriented in directions other than the θ
angle.
- to the longitudinal direction;
Specification