Implant and implant system

Patent metadata

Field	Value
Publication number	US-10022230-B2
Application number	US-201615053469-A
Country	US
Kind code	B2
Filing date	Feb 25, 2016
Priority date	Jun 7, 2011
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

An implant system for implantation at a joint, the implant system including an implant device which includes a body portion having first and second ends, and a first elongate member, extending from the first or second end of the body portion. The implant system also includes a corresponding fixation device for securing the first elongate member to a subject, and the fixation device includes at least one latching element, the first elongate member includes at least one cooperating element, the at least one cooperating element being capable of cooperating with the at least one latching element of the fixation device in use.

First claim

The invention claimed is:

1. A prosthetic meniscus implant system for implantation at a knee joint, the implant system including a prosthetic meniscus device, the prosthetic meniscus device comprising:
a crescent-shaped body portion having an upper surface for engagement with a patient's femur, an opposing lower surface for engagement with a patient's tibia, a first end, and a second end,
a first elongate member, extending from the first end of the body portion and terminating in a free end, at least a portion of the first elongate member being strap-shaped or substantially crescent shaped in cross-section,
a second elongate member, extending from the second end of the body portion and terminating in a free end, at least a portion of the second elongate member being strap-shaped or substantially crescent shaped in cross-section,
a first corresponding fixation device for securing the first elongate member to a subject's tibia, the first fixation device comprising at least one latching element, the first elongate member comprising at least one cooperating element, the at least one cooperating element being capable of cooperating with said at least one latching element of the first fixation device in use,
a second corresponding fixation device for securing the second elongate member to said subject's tibia, the second fixation device comprising at least one latching element, the second elongate member comprising at least one cooperating element, the at least one cooperating element of the second elongate member being capable of cooperating with said at least one latching element of said second fixation device in use, and
a reinforcing element, which extends continuously through the first elongate member, through the body portion, and through the second elongate member, the reinforcing element being a planar, strap-shaped element embedded within the body portion,
wherein the reinforcing element is characterized by a planar face, and the body portion is characterized by a transverse plane corresponding to a transverse plane of the joint, and the planar face of the reinforcing element is disposed within the body portion substantially perpendicular to the transverse plane of the body portion,
wherein the first elongate member is insertable in a bone tunnel in a subject's tibia and the second elongate member is securable at the subject's tibia,
wherein the first fixation device is adapted to fix the first elongate member in said bone tunnel,
wherein the at least one cooperating element of the first elongate member comprises a plurality of ratchet teeth,
and wherein the first fixation device comprises an interference screw adapted to fix the first elongate member in said bone tunnel, wherein the interference screw comprises external threading forming a plurality of latching elements adapted to penetrate into bone on either side of the bone tunnel, fixing the interference in the bone tunnel while also interlocking with the ratchet teeth of the first elongate member in use.

2. An implant system according to claim 1 , wherein:
each ratchet tooth comprises a first surface angled relative to said elongate member, the first surface sloping towards said elongate member in a direction towards the free end of said elongate member, and
a second surface which slopes towards said elongate member in a direction away from the free end of said elongate member, said second surface being more steeply sloped than said first surface.

3. An implant system according to claim 1 , wherein the first fixation device is an externally helically threaded screw.

4. An implant system according to claim 1 , wherein the implant system further comprises an elongate sheath, the first elongate member being insertable in the sheath, wherein the first fixation device is insertable in the sheath, and wherein the internal surface of the sheath has at least one protuberance capable of cooperating with said at least one latching element on the first fixation device.

5. An implant system according to claim 4 , wherein at least a portion of the sheath is internally screw threaded, such that the external threading of said first fixation device is capable of securely engaging in the sheath.

6. An implant system according to claim 4 , wherein the sheath has means for non-movably securing it to a subject's bone.

7. An implant system according to claim 1 , wherein said at least one cooperating element of the second elongate member comprises at least one aperture for receiving said corresponding latching element in use, for directly securing said elongate member to bone.

8. An implant system according to claim 1 , wherein one of the first and second elongate members is a posterior insertion for securing at a posterior region of the subject's tibia and the other of the first and second elongate members being an anterior insertion for securing at an anterior region of the subject's tibia in use.

Assignees

• Imp Innovations Ltd

Inventors

• Amis Andrew Arthur
• Cobb Justin Peter
• Bull Anthony Michael James
• Babu Sarat

Classifications

• A61F2002/30014

  differing in elasticity, stiffness or compressibility · CPC title

• A61F2/30965

  Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping · CPC title

• A61F2/30749

  Fixation appliances for connecting prostheses to the body · CPC title

• A61F2002/30004

  the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis · CPC title

• A61F2/3872 Primary

  Meniscus for implantation between the natural bone surfaces · CPC title