Thigh stump endoprosthesis for an exoprosthetic treatment

• US 6,709,466 B1
• Filed: 08/08/2001
• Issued: 03/23/2004
• Est. Priority Date: 07/14/1999
• Status: Expired due to Fees

• Current Assignee: Orthodynamics GmbH
• Original Assignee: Eska Implants GmbH & Co. KG.
• Inventors: Grundei, Hans
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): Stewart, Alvin
• Application Number:
  US09/913,036
• Time in Patent Office: 958 Days
• Field of Search: 623/32, 623/38, 623/53, 623/27, 623/28, 623/33, 623/39, 623/43, 623/46, 623/30, 623/31, 623/60, 623/58, 623/408
• US Class Current: 623/32
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61F 2/2814 Bone stump caps
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/64 Knee joints
• CPC Class Codes: A61F 2/80 Sockets, e.g. of suction type
• CPC Class Codes: A61F 2002/2825 Femur
• CPC Class Codes: A61F 2002/3007 Coating or prosthesis-covering structure made of elastic material, e.g. of elastomer
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/3023 wedge-shaped cylinders
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30476 locked by an additional locking mechanism
• CPC Class Codes: A61F 2002/30563 having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30909 Nets
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/5038 Hinged joint, e.g. with transverse axle restricting the movement
• CPC Class Codes: A61F 2002/607 Lower legs
• CPC Class Codes: A61F 2002/7887 for connecting limb exoprostheses to the stump bone
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0069 : cylindrical

Abstract

The invention relates to a thigh stump endoprosthesis for an exoprosthetic treatment of a patient whose leg has been amputated in the thigh area, whereby the thigh stump can be pulled into a shaft to which the replica of a lower leg part and foot part of the prosthesis is attached. The inventive prosthesis includes a proximal shaft part which can be inserted inside a femur stump, whereby the shaft part is at least partially covered by an open-mesh three-dimensional spatial network structure, and includes a conical adapter on the distal end thereof. A condyle replacement which re-creates the shape of natural condyles of a knee joint can be coupled to the shaft part by means of said adapter. A cuneiform support can be joined to the condyle replacement with a wedge angle α which restores the valgity of the leg.

Claims

1. A thigh stump endoprosthesis for a thigh stump having a femur stump, the thigh stump is disposed in a shaft, and an artificial lower leg is connected to the shaft, the endoprosthesis comprising:

a stem part having a first end and a second end, said first end is set into the femur stump;

an open-mesh, three-dimensional lattice covering at least partially the stem part;

a conical adapter on the second end of the stem part;

a condyle replacement modeled to the shape of natural condyles of a knee joint and coupled to the stem part; and

a wedge-shaped base connected to the condyle replacement.

2. The thigh stump endoprosthesis according to claim 1, wherein a wedge angle α

of the base is in the range 5°

<

α

<

9°

.

3. The thigh stump endoprosthesis according to claim 2, wherein the base is connected to a shock-absorbing layer.

4. The thigh stump endoprosthesis according to claim 2, wherein the base comprises a shock-absorbing cushion.

5. The thigh stump endoprosthesis according to claim 1, wherein the base is connected to a shock-absorbing layer.

6. The thigh stump endoprosthesis according to claim 5, wherein the base comprises a shock-absorbing cushion.

7. The thigh stump endoprosthesis according to claim 1, wherein the base comprises a shock-absorbing cushion.

8. The thigh stump endoprosthesis according to claim 1, wherein the base comprises silicone.