Hinge prosthetic joint with ball head

• US 4,129,903 A
• Filed: 05/31/1977
• Issued: 12/19/1978
• Est. Priority Date: 06/03/1976
• Status: Expired due to Term

• Current Assignee: Arnold H. Huggler
• Original Assignee: Arnold H. Huggler
• Inventors: Huggler, Arnold H.
• Primary Examiner(s): Frinks, Ronald L.
• Application Number:
  US05/802,144
• Time in Patent Office: 567 Days
• Field of Search: 3/1.913, 3/1.912, 3/1.91, 128/92 C, 128/92 CA, 128/92 BA, 128/92 BB
• US Class Current: 623/23.11
• CPC Class Codes: A61B 17/742 having one or more longitudinal elements oriented along or parallel to the axis of the neck
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/3601 for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices non-prosthetic internal fixation devices for the femoral head or neck A61B17/74
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30565 having spring elements
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30599 stackable
• CPC Class Codes: A61F 2002/30729 Separate collars
• 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 2002/3611 Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/3625 Necks
• CPC Class Codes: A61F 2002/3631 with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/365 Connections of heads to necks
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• 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 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts

Abstract

A hinge prosthetic joint with a ball head, especially an endoprosthetic joint having a ball head for use with the proximal region of a bone such as the femur, wherein the ball head is provided with a traction or tension device for the anchoring thereof at an end of the bone. The tension device comprises a tension or tie rod which can be inserted through the bone, a pressure disc which can be placed into contact with the bone at the side of the ball head, and a counter plate which can be placed into contact with the opposite side of the bone.

Claims

1. A hinge prosthetic joint for a bone, especially a proximal femur-endoprosthetic joint, comprising:

a ball;

a tension device for anchoring the ball at an end of the bone where the prosthetic joint is implanted, said tension device comprising a tension rod insertable through the bone, a pressure disc which can be placed upon the bone at the side of the ball, and a counter plate which can be placed at the opposite side of the bone;

a substantially sleeve-shaped hollow pin for mounting the ball at the pressure disc, said tension rod extending into the hollow interior of said sleeve-shaped pin; and

a nut member for threadably connecting said tension rod within said sleeve-shaped pin.

2. The prosthetic joint as defined in claim 1, wherein:

said pressure disc has an end surface confronting the bone and equipped with a substantially ring-shaped groove enabling the pressure disc to be placed over a resected end of the bone neck, in order to provide the transverse stability of the pressure disc and the requisite resistance against twisting between the pressure disc and the bone.

3. The prosthetic joint as defined in claim 1, further including:

means provided for the counter plate for connecting the counter plate with the cortical layer of the bone in the implanted condition of the prosthetic joint.

4. The prosthetic joint as defined in claim 1, wherein:

said pressure disc has a surface bearing at the bone; and

at least said surface of said pressure disc being formed of ceramic material.

5. The prosthetic joint as defined in claim 1, wherein:

said sleeve-shaped pin includes a base portion;

a compression spring arranged between said nut member and said base portion of said sleeve-shaped pin, so that said tension device is subjected to pre-bias at all times and thus prevents lifting-off of the pressure disc from the bone under load.

6. The prosthetic joint as defined in claim 5, wherein:

said compression spring comprises at least one plate spring.

7. The prosthetic joint as defined in claim 5, wherein:

said compression spring comprises a set of plate springs.

8. The prosthetic joint as defined in claim 1, further including:

a safety- and control screw means arranged between the counter plate and the pressure disc above the tension rod, so that when the prosthetic joint is implanted there is avoided under load any lifting-off of the pressure disc from the bone.

9. A hinge prosthetic joint for a bone, especially a proximal femur-endoprosthetic joint, comprising:

a ball;

a hollow pin at which the ball is provided, said hollow pin having a shaft provided with a shoulder below the ball, said shoulder being substantially spherically curved at its surface remote from the ball;

a tension device for anchoring the ball at an end of the bone where the prosthetic joint is implanted, said tension device comprising a tension rod insertable through the bone and surrounded over the major portion of its length by said pin shaft, and the tension rod having a head-end and being threadably connected from the side of its head-end into the pin shaft, and the tension device further comprising a pressure disc which can be placed upon the bone between the bone and the shoulder of the pin shaft and has a central opening equipped with means defining a seat which coacts with the spherically curved surface of said shoulder, and

a counter plate which can be placed at the side of the bone remote from said pressure disc.

10. The prosthetic joint as defined in claim 9, further including:

means for securing the pressure disc against rotation in the implanted condition of the prosthetic joint.

11. The prosthetic joint as defined in claim 9, wherein said pressure disc has an end surface confronting the bone and equipped with a substantially ring-shaped groove enabling the pressure disc to be placed over a resected end of the bone neck, in order to provide the transverse stability of the pressure disc and the requisite resistance against twisting between the pressure disc and the bone.

12. The prosthetic joint as defined in claim 9, further including means provided for the counter plate for connecting the counter plate with the cortical layer of the bone in the implanted condition of the prosthetic joint.

13. The prosthetic joint as defined in claim 9, wherein said pressure disc has a surface bearing at the bone, and at least said surface of said pressure disc is formed of ceramic material.