Medical implant for fixation and integration with hard tissue

Patent metadata

Field	Value
Publication number	US-11116643-B2
Application number	US-201715650166-A
Country	US
Kind code	B2
Filing date	Jul 14, 2017
Priority date	Mar 15, 2013
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

The invention relates to medical implants, including spinal implants and bone grafts, for fixation and integration with hard tissue. The bone medical implants include at least one rotational fixation mechanism that further includes or is attached to one or more sharp protrusions configured to penetrate and become lodged into hard tissue to provide support and positional stability. Such support is useful to ensure that the spinal bone graft may be used without additional stabilizing or anchoring structures, such as supporting plates or screws.

First claim

What is claimed:

1. A compound medical implant for fixation and integration with hard bone tissues, the compound medical implant comprising:
a base member including a solid annular ring body and a void space, defined by opposed superior and inferior surfaces, configured to contact first and second hard bone tissues of a patient;
one or more rotational mechanisms centered on and rotatable around an axis;
one or more biocompatible rods that are permanently attached to the base member wherein:
the biocompatible rods are approximately parallel to the opposed superior and inferior surfaces and traverse through the solid annular ring body and the void space,
the biocompatible rods are fully rotatable and permanently attached to the one or more rotational mechanisms,
the one or more rotational mechanisms operate as cams around the axis, and
the one or more rotational mechanisms rotate around the axis using the biocompatible rod;

one or more screws pushing the one or more rotational mechanisms such that the one or more rotational mechanisms rotate about the axis, wherein the one or more screws are orthogonally oriented to the axis and rotation of the one or more rotational mechanisms is less than rotation of the one or more screws, and
one or more protrusions attached to each of the one or more rotational mechanisms, the one or more protrusions urged into the hard bone tissue by the one or more rotational mechanisms, each protrusion having a proximal end attached to the one or more rotational mechanisms and a distal end configured to penetrate and become lodged into the hard bone tissue at an integration site, wherein:
at least a distal end of a first protrusion is configured to penetrate and become lodged into the hard tissue at a first integration site of the first hard bone tissue facing the superior surface, and
at least a distal end of a second protrusion is configured to penetrate and become lodged into the hard tissue at a second integration site of the second hard bone tissue facing the inferior surface.

2. The compound medical implant of claim 1 , wherein:
the first integration site and the second integration site are located on a vertebra, a knee, a shoulder, an elbow, a wrist, an ankle, a hip, or a finger.

3. The compound medical implant of claim 1 , wherein the one or more rotational mechanisms, the first protrusion, and the second protrusion are independently made of a member, wherein the member is a cortical bone, a biocompatible metal, a biocompatible polymer, or a biocompatible inorganic material.

4. The compound medical implant of claim 3 , wherein the one or more rotational mechanisms, the first protrusion, and the second protrusion are each made of the cortical bone.

5. The compound medical implant of claim 1 , wherein the protrusions are sharp and each have a length ranging from 0.5 mm to 8 mm.

6. The compound medical implant of claim 1 , wherein the first protrusion and the second protrusion each have a pyramidal cross section.

7. The compound medical implant of claim 1 , wherein the protrusions are sharp and the distal end of the first sharp protrusion and the second sharp protrusion has a first angle and a second angle.

8. The compound medical implant of claim 7 , wherein: the first angle is sloped at an angle from 5° to 35° in a first direction of the sharp protrusion penetration, and the second angle is sloped at an angle from 10° to 60° in a second direction of the sharp protrusion penetration.

9. The compound medical implant of claim 1 , wherein each of the opposed superior and inferior surfaces include a plurality of hard bone tissue engaging protrusions.

10. A compound medical implant for fixation and integration with hard bone tissues, the compound medical implant comprising:
a base member including a first portion and a second portion defining a void space, the first portion and the second portion each defined by opposed superior and inferior surfaces, configured to contact first and second hard bone tissue of a patient;
one or more rotational fixation mechanisms centered on and rotatable around an axis;
one or more biocompatible rods that are permanently attached to the base member wherein:
the biocompatible rods are approximately parallel to the opposed superior and inferior surfaces and traverses through the void space defined by the first portion and the second portion,
the biocompatible rods are fully rotatable and permanently attached to each of the one or more rotational fixation mechanisms,
the one or more rotational fixation mechanisms operate as cams around the axis, and
the one or more rotational fixation mechanisms rotate around the axis using the biocompatible rods; and

two or more sharp protrusions attached to the one or more rotational fixation mechanisms, the two or more sharp protrusions urged into the hard bone tissue by the one or more rotational fixation mechanisms,
a first sharp protrusion of the two or more sharp protrusions having a first proximal end attached to the one or more rotational fixation mechanisms and a first distal end, a second sharp protrusion of the two or more sharp protrusions having a second proximal end attached to the one or more rotational fixation mechanisms and a second distal end, the first and second distal ends configured to penetrate and become lodged into the hard bone tissue at an integration site,
wherein:
the first distal end of the first sharp protrusion is configured to penetrate and become lodged into the first hard bone tissue at the first integration site of the first hard bone tissue facing the superior surface, and
the second distal end of the second sharp protrusion is configured to penetrate and become lodged into the second hard bone tissue at the second integration site of the second hard bone tissue facing the inferior surface.

11. The compound medical implant of claim 10 , wherein:
the first integration site and the second integration site are located on a vertebra, a knee, a shoulder, an elbow, a wrist, an ankle, a hip, or a finger.

12. The compound medical implant of claim 10 , wherein a first rotational fixation mechanism of the one or more rotational fixation mechanisms and the first sharp protrusion are independently made of a member, wherein the member is a cortical bone, a biocompatible metal, a biocompatible polymer, or a biocompatible inorganic material.

13. The compound medical implant of claim 12 , wherein the first rotational fixation mechanisms and the first sharp protrusion are each made of the cortical bone.

14. The compound medical implant of claim 10 , wherein the first sharp protrusion has a length ranging from 0.5 mm to 8 mm.

15. The compound medical implant of claim 10 , wherein the first sharp protrusion has a pyramidal cross section.

16. The compound medical implant of claim 10 , wherein the first distal end of the first sharp protrusion has a first angle and a second angle.

17. The compound medical implant of claim 16 , wherein: the first angle is sloped at an angle from 5° to 35° in a first direction of the sharp protrusion penetration, and the second angle is sloped at an angle from 10° to 60° in a second direction of the sharp protrusion penetration.

18. The compound medical implant of claim 10 , wherein each of the opposed superior and inferior surfaces include a plurality of hard bone tissue engaging protrusions.

19. The compound medical implant of claim 18 , wherein:
each of the opposed superior and inferior surfaces are textured, and
the first sharp protrusion exceeds a height of the te

Assignees

• Lifenet Health

Inventors

• Chen Jingsong
• Phelps Dennis
• Pritchard Andy T
• Kemper Nathan
• Brewer Thomas

Classifications

• A61F2/44 Primary

  for the spine, e.g. vertebrae, spinal discs · CPC title

• A61F2002/30462

  retained or tied with a rope, string, thread, wire or cable · CPC title

• A61F2310/00023

  Titanium or titanium-based alloys, e.g. Ti-Ni alloys · CPC title

• A61F2002/30843

  Pyramidally-shaped · CPC title

• A61F2002/3093

  for promoting ingrowth of bone tissue · CPC title