Tissue expander system

• US 4,685,447 A
• Filed: 03/25/1985
• Issued: 08/11/1987
• Est. Priority Date: 03/25/1985
• Status: Expired due to Term

• Current Assignee: PMT Limited
• Original Assignee: PMT Corporation
• Inventors: Iversen, Alfred A., Eastman, William J., Van Beek, Allen L.
• Primary Examiner(s): FRINKS, RONALD
• Application Number:
  US06/715,457
• Time in Patent Office: 869 Days
• Field of Search: 128/1 R, 128/DIG. 14, 128/DIG. 20, 128/DIG. 25, 604/96, 604/103, 623/11, 623/12, 623/7, 623/8
• US Class Current: 128/899
• CPC Class Codes: A61B 90/02 Devices for expanding tissue, e.g. skin tissue implements for holding wounds open, surgical tractors A61B17/02; implantable mammary prosthesis A61F2/12; dilators A61M29/00
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers
• CPC Class Codes: A61F 2/0059 Cosmetic or alloplastic implants A61F2/10 - A61F2/16, A61F2/28 take precedence
• CPC Class Codes: Y10S 128/14 Polytetrafluoroethylene, i.e. PTFE
• CPC Class Codes: Y10S 128/20 Inflatable splint
• CPC Class Codes: Y10S 128/21 Silicone

Abstract

Tissue expander system including a tissue expander, an injection port, and a tube connecting the tissue expander to the injection port. The tissue expander is of a one piece molded body of a pancake to waffle like configuration. Within the one piece molded body is a member of non-stick material of a slightly smaller geometrical shape similar to that of the one piece molded body. A self-sealing valve member closes off the tube in the tissue expander after injection of a solution for expanding the tissue expander. A Dacron mesh can be embedded in members of the one piece body providing for directional expansion of the tissue expander. In an alternative embodiment, Dacron mesh can be provided in both the upper and lower members of the one piece body. An accordion configured perimeter also provides for upward directional expansion. The tissue expanders can assume any geometrical configuration, whether it be square, rectangular, circular, oval, or kidney shaped. The tissue expander can also be a small enough size for hands and toes, a miniature size for use on the face, or a large size for use on the chest or other body area. A self-sealing injection port can be domed or cylindrical, and includes a stainless steel bottom, as well as a Dacron mesh impregnated silicone top. The stainless steel bottom provides for limiting injection needle penetration and for injection port location during X-ray procedure.

Claims

1. Tissue expander for insertion between skin and flesh comprising:

a. one piece molded member of an and a finite thickness and assuming a predetermined geometrical shape, said member including a lower surface and an upper surface with a molded edge formed by said surfaces, and an internal cavity therein;

b. tube means secured to and extending partially into said cavity providing for fluid to pass into said member; and

c. at least one sheet of non-stick PTFE material positioned between said upper and lower surface assuming said geometrical shape, and adjacent to an inner portion of said edge.

2. Tissue expander of claim 1 comprising at least two sheets of non-stick material between said surfaces, said tube means extending in between said two sheets.

3. Tissue expander of claim 2 wherein each of said sheets of material.

4. Tissue expander of claim 1 comprising a valve means at said inner end of said tube means.

5. Tissue expander of claim 4 wherein said valve means comprises a section of said non-stick material over an end of said tube.

6. Tissue expander of claim 1 wherein said lower surface includes a mesh disposed within said lower surface.

7. Tissue expander of claim 1 wherein said edge includes accordion expansion means providing for directional expansion.

8. Tissue expander of claim 1 wherein said lower and upper surfaces include a mesh disposed with said lower and upper surfaces.

9. Tissue expander of claim 1 wherein said geometrical shape is square.

10. Tissue expander of claim 1 wherein said geometrical shape is rectangular.

11. Tissue expander of claim 1 wherein said geometrical shape is oval.

12. Tissue expander of claim 1 wherein said geometrical shape is kidney shaped.

13. Tissue expander of claim 1 wherein said geometrical shape is a donut.

14. Tissue expander of claim 1 wherein said geometrical shape is oblong.

15. Tissue expander of claim 1 wherein said geometrical shape is circular.

16. Tissue expander of claim 1 comprising injection port means connected to said tube means for passing of fluid to said member.

17. Tissue expander of claim 16 wherein said injection port includes a raised dome member.

18. Tissue expander of claim 17 wherein said dome member includes a mesh disposed with said dome member.

19. Tissue expander comprising:

a. one piece molded silicone rubber member of a finite thickness and of a predetermined geometrical shape, said member including a lower surface and an upper surface, a molded edge formed at a junction of said surfaces, and a cavity formed therein;

b. tube means extending into said cavity at said edge providing for fluid to pass into said member; and

,

c. two sheets of non-stick PTFE material between said surfaces and an end of said tube, said material of a smaller surface area than that of said geometrical shape of said surfaces.

20. Tissue expander comprising:

a. one piece molded member of a finite thickness and of a predetermined geometrical shape, said member including a lower surface and an upper surface, a molded edge formed at a junction of said surfaces, and a cavity formed therein;

b. tube means extending into said member at said edge providing for fluid to pass into said member including a valve means for checking fluid flow; and

,

c. one sheet of non-stick PTFE material between said surfaces and an end of said tube, said material of a smaller surface area than that of said geometrical shape of said surfaces.

21. Tissue expander of claim 20 including at least one surface with an impregnated polyethylene terephthalate mesh.

22. Tissue expander of claim 20 wherein said valve means comprises a flap of said material about said tube means.

23. Tissue expander of claim 22 wherein said edge includes an accordion expansion means.

24. Tissue expander of claim 23 wherein at least one of said surfaces includes a polyethylene terephthalate mesh.

25. Tissue expander of claim 20 wherein said one piece molded member is silicone rubber.

26. Tissue expander of claim 20 including a dome injection port means connected to said tube means.

27. Tissue expander of claim 26 wherein a metal base is provided in said injection port means.

28. Tissue expander of claim 26 comprising a mesh embedded in said dome.

29. Tissue expander of claim 26 wherein said injection port is a one piece molded assembly.