Subcutaneous, intramuscular bearing for a rigid transcutaneous implant

• US 20050102038A1
• Filed: 11/05/2004
• Published: 05/12/2005
• Est. Priority Date: 11/07/2003
• Status: Active Grant

• Current Assignee: Orthodynamics GmbH
• Original Assignee: Eska Implants GmbH & Co. KG.
• Inventors: Grundei, Hans
• Granted Patent: US 7,018,420 B2
• Time in Patent Office: Days
• US Class Current: 623/23.460
• CPC Class Codes: A61F 2/2814 Bone stump caps
• CPC Class Codes: A61F 2/30723 Plugs or restrictors for sealing a cement-receiving space tools for inserting plugs A61F2/4614; sealing collars for use during cementing A61B17/8808
• CPC Class Codes: A61F 2/30742 Bellows or hose-like seals; Sealing membranes A61B17/8808 takes precedence; sealing membranes for retaining bone substitute A61F2/2846
• 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 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/78 Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump
• CPC Class Codes: A61F 2002/30011 differing in porosity
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30339 Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30574 with an integral complete or partial collar or flange
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30677 : Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/3068 : the pharmaceutical product being in a reservoir
• CPC Class Codes: A61F 2002/30738 : Sleeves
• CPC Class Codes: A61F 2002/30822 : Circumferential grooves
• CPC Class Codes: A61F 2002/30909 : Nets
• CPC Class Codes: A61F 2002/3093 : for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2002/4658 : for measuring dimensions, e.g. length
• 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 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0024 : made from both porous and non-porous parts, e.g. adjacent parts
• CPC Class Codes: A61F 2250/0067 : Means for introducing or releasing pharmaceutical products into the body
• CPC Class Codes: A61F 2250/0068 : the pharmaceutical product being in a reservoir

Abstract

A subcutaneous, intramuscular bearing (1) for a rigid transcutaneous implant (2) is provided, for anchoring intracorporally in a bone stump and having an intermediate piece (3) between the implant (2) and an extracorporal coupling for coupling on the implant. A rigid bushing (5) is tightly connected to the intermediate piece (3), such that between the wall of the bushing (5) and the intermediate piece (3) an annular space (6) is formed, which is closed in the intracorporal direction, for receiving and setting the extracorporal coupling. The outer wall of the bushing (5) has an open-meshed, three-dimensional lattice structure (8) and a lattice-free distal region having a width B. A spring ring (9) is set in the annular space (6) from the distal end, moved with a telescoping motion, and locked under exertion of its spring effect.

Claims

1. A subcutaneous, intramuscular bearing for a rigid transcutaneous implant (2), which can be anchored intracorporally in a bone stump, comprising:

an intermediate piece (3) between the implant (2) and an extracorporal coupling that can be coupled to the implant

a rigid bushing (5) tightly connected to the intermediate piece (3), such that between a wall of the bushing (5) and the intermediate piece (3) a closed annular space (6) is formed in an intracorporal direction to receive the extracorporal coupling,

an open-meshed, three-dimensional lattice structure (8) on an outer wall of the bushing (5) and a distal region of the outer wall having a width B which is free of the three-dimensional lattice structure, and

a spring ring (9), insertable in the annular space (6) from its distal end, moved there with a telescoping motion, and locked under exertion of a spring effect of the spring ring (9).

2. The bearing according to claim 1, wherein the spring ring (9) comprises a ring having a bent section and a radial slot (10).

3. The bearing according to claim 1, wherein the three-dimensional lattice structure free region of the bushing (5) has a width B of up to about 2 cm.

4. The bearing according to claim 1, wherein the three-dimensional lattice structure has mesh widths in a range of about 500 to 2500 μ

m.

5. The bearing according to claim 1, wherein the bushing (5) is tightly connected to the intermediate piece (3) by heat-shrinking onto the intermediate piece.

6. The bearing according to claim 1, wherein the bushing (5) is fused with the intermediate piece.

7. The bearing according to claim 1, wherein the bushing (5) is an integral one-piece unit with the intermediate piece (3).

8. The bearing according to claim 1, wherein the intermediate piece (3) comprises a double cone having a cylindrical center section (11) to which the bushing (5) is connected.

9. A subcutaneous, intramuscular bearing for a rigid transcutaneous implant (102), which can be anchored intracorporally in a bone stump, comprising:

an intermediate piece (103) between the implant (102) and an extracorporal coupling (107) that can be coupled to the implant,

a rigid bushing (105) tightly connected to the intermediate piece (103) with a coupling element (106), which is closed in an intracorporal direction and to which the extracorporal coupling (107) can be coupled,

an open-meshed, three-dimensional lattice structure (108) on an outer wall of the bushing (105) and a distal region of the outer wall having a width B which is free of the three-dimensional lattice structure,

an activatable device for applying bioactive material, provided in a region where the implant emerges from the leg stump, and

a spring ring (109), insertable in the coupling element (106) from its distal end, moved there with a telescoping motion, and locked under exertion of a spring effect of the spring ring (109).

10. The bearing according to claim 9, wherein the activatable device comprises:

at least one circular ring groove (110) formed in the outer wall of the bushing (105), and

at least one hollow ring (111), insertable in the ring groove (110) and comprising an elastic and porous material having a molded inlet port (112), through which the hollow ring (111) can be charged with a liquid bioactive material.

11. The bearing according to claim 10, wherein the material of the hollow ring (111) and the inlet port (112) comprises silicone.

12. The bearing according to claim 9, wherein the activatable device comprises:

at least one circular ring groove (110) formed in the outer wall of the bushing (105), and

at least one branch channel (113) arranged laterally in the bushing (105) adjacent the coupling element (106), and extending to intersect a periphery of the at least one ring groove (110) for introducing a liquid bioactive material.

13. The bearing according to claim 12, further comprising at least one branch channel (114) on the outer wall of the bushing (105) in a lower region of the three-dimensional lattice structure (108) between a lowermost ring groove (110) and the three-dimensional lattice structure free region of the bushing (105) for transporting the bioactive material to a point where the implant emerges from the leg stump.

14. The bearing according to claim 9, further comprising an annular ring space (115) arranged around the coupling element (106) and a supply of elastic film (116) comprising bioactive material stored in the annular ring space (115), wherein the film (116) emerges from the annular space (115) through a ring-shaped slot (117) in the bushing (105), extends along the three-dimensional lattice structure free region of the bushing (105) up to a point where the implant emerges from the leg stump, and surrounds the coupling element (106) like a tube.

15. The bearing according to claim 14, wherein the coupling element (106) comprises a conical clamping sleeve.