Regeneration of living tissues by growth of isolated cells in porous implant and product thereof

• US 4,553,272 A
• Filed: 02/26/1981
• Issued: 11/19/1985
• Est. Priority Date: 02/26/1981
• Status: Expired due to Fees

• Current Assignee: University of Pittsburgh A Non-Profit Corporation of Pennsylvania
• Original Assignee: University Of Pittsburgh (University of Pittsburgh of The Commonwealth System of Higher Education)
• Inventors: Mears, Dana C.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): ISABELLA, DAVID J
• Application Number:
  US06/238,374
• Time in Patent Office: 1,727 Days
• Field of Search: 128/92 G, 3/1.9, 3/1
• US Class Current: 623/1.4
• CPC Class Codes: A61C 2008/0046 Textured surface, e.g. roughness, microstructure A61C8/0013 takes precedence
• CPC Class Codes: A61C 8/0036 Tooth replica
• CPC Class Codes: A61F 2/0063 Implantable repair or support meshes, e.g. hernia meshes
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30 Joints
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2002/0086 for preferentially controlling or promoting the growth of specific types of cells or tissues of bone tissue onto implantable joints A61F2002/3093
• CPC Class Codes: A61F 2002/30011 differing in porosity
• CPC Class Codes: A61F 2002/30762 Means for culturing cartilage
• CPC Class Codes: A61F 2002/30929 having at least two superposed coatings
• CPC Class Codes: A61F 2002/3093 for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2002/4648 Means for culturing bone graft
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: A61L 27/38 containing added animal cells organs or tissue containing native cells A61L27/36
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges

Abstract

A method of repair of patient tissues by implant including providing a living cell sample which is introduced into an implant member having a porous open structure. The cell sample may be cultured in the implant. The implant is secured to the patient, as by surgical implantation. In one embodiment, the implant portion which receives the cells preferably has a pore size of about 25 to 75 microns. In addition, a second pore size of about 100 to 400 microns for receipt of blood vessels and osteogenus cells through ingrowth after introduction into the patient, may be provided. The cell sample may advantageously be selected from the group consisting of cartilage cells, tendon cells, ligament cells and musculotendinous cells. The implant member may be advantageously used in bone or joint reconstruction surgery and in other forms such as artificial tooth implantation.

A surgical implant comprising an inert member having, in one embodiment, a first series of open pores of an average size of about 25 to 75 microns and a second series of open pores of an average size of about 100 to 400 microns with patient cells growing within the pores.

Claims

1. A method of repair of patient tissues by implant comprising

providing a starter cell sample,

providing an implant member having a porous structure,

providing said implant material with an open pore structure having a number of pores of an average pore size of about 25 to 75 microns,

introducing said cell sample into the pores of said implant member,

surgically effecting securement of said implant to said patient, whereby said cell sample will initiate growth within said pores and effect reconstruction of said tissues,

providing said implant member with at least two distinct pore sizes,

providing a first said pore size of about 100 to 400 microns and a second said pore size of about 25 to 75 microns,

culturing said starter cells in said second pores, and

providing a barrier separating said first pores from said second pores.

2. A surgical implant comprising

an inert member having at least one series of open pores,

said pores being about twenty to fifty percent of the total volume of said implant member,

said series of pores having an average size of about 25 to 75 microns,

patient cells disposed within said pores,

said inert implant having a second series of open pores having an opening size of about 100 to 400 microns, and

barrier means separating said first series of pores from said second series of pores.