Microvessel cell isolation apparatus

• US 5,409,833 A
• Filed: 07/01/1993
• Issued: 04/25/1995
• Est. Priority Date: 07/01/1993
• Status: Expired due to Term

• Current Assignee: Edwards Lifesciences Corporation
• Original Assignee: Baxter International Inc.
• Inventors: Nguyen, Than, Hu, Can B., Rhee, Richard, Ma, Minh T., Myers, Keith
• Primary Examiner(s): Beisner, William H.
• Application Number:
  US08/086,778
• Time in Patent Office: 663 Days
• Field of Search: 435/1, 435/262, 435/267, 435/271, 435/284-286, 435/288, 435/296, 435/311, 435/802, 435/809, 435/316, 422/99, 422/101, 422/102, 422/103, 422/104, 494/16, 494/36
• US Class Current: 435/297.2
• CPC Class Codes: A61F 2/062 Apparatus for the production of blood vessels made from natural tissue or with layers of living cells prostheses made from natural tissue or living cells A61L27/507
• CPC Class Codes: A61M 2202/0071 product to be retained or harvested, e.g. by pheresis
• CPC Class Codes: A61M 2202/08 Lipoids
• CPC Class Codes: A61M 2202/097 endothelial cells
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: C12M 45/05 by centrifugation centrifuges in general B04B
• CPC Class Codes: C12M 45/09 by enzymatic treatment

Abstract

A processing vessel for isolating microvessel endothelial cells from liposuctioned fat tissues includes a fat-receiving basket defined by polyester screen material. Fat tissue removed from a patient by liposuction is received into the basket and is rinsed and digested with an enzymatic solution. The freed microvessel endothelial cells from the fat tissues are separated from the fat cells, and from blood cells and other materials which may be present in the basket by centrifuging. A bottom chamber of the processing vessel is configured to define a "pellet" of isolated endothelial cells which may be removed from the processing vessel for deposition on the inner lumenal surface of a synthetic graft which the fat-donor patient is to receive.

Claims

1. A process vessel for use in receiving, cleansing, digesting and isolating certain identifiable cells from tissues, said process vessel comprising:

a housing defining a process chamber, said process chamber including a lower conical portion; and

a screen basket including a conical portion defining a lower part of said screen basket, said screen basket and its conical portion positioned in said process chamber and its lower conical portion to define a gap separating said screen basket from said housing, the size of said gap being substantially consistent across the screen basket and its conical portion.

2. The process vessel of claim 1 in which said screen basket has a low surface energy when compared with metals.

3. The process vessel of claim 2 in which said screen basket is fabricated of a polymer material.

4. The process vessel of claim 3 in which said polymer material is chosen from the group consisting of polyethylene, polypropylene, polyester, nylon, and fluoropolymers.

5. The process vessel of claim 4 in which said screen basket has a mesh in which the size of its openings is in the 20 micron to 800 micron range.

6. The process vessel of claim 5 wherein said screen basket has a mesh in which the size of its openings is in the 200 micron to 500 micron range.

7. The process vessel of claim 5 in which said screen basket has a mesh in which the size of its openings is about 350 microns.

8. The process vessel of claim 3 in which said polymer material of said screen basket has an open area of about 50 percent.

9. The process vessel of claim 1 in which said gap defines a portion of said process chamber outwardly of said screen basket, said housing defining a port which fluidly communicates with said chamber portion without fluid flow through said screen basket.

10. The process vessel of claim 9 in which said housing includes a cap portion, said cap portion defining said port, and a passage communicating from said port to said chamber portion outwardly of said screen basket.

11. The process vessel of claim 10 in which said cap portion further defines a second port opening into the interior of said screen basket.

12. The process vessel of claim 1 wherein said housing further includes an ampule passage portion of said chamber which opens downwardly from the lower conical portion of said chamber, said housing further including a pair of vertically spaced apart valving devices which each include a respective bore defining a portion of said ampule passage portion in a first position for said valving devices.

13. The process vessel of claim 12 wherein said pair of valving devices also each include a transverse passage defining a T-intersection with said respective bore of the valving device in a second position of said valving devices, said respective bores being disposed out of communication with said ampule passage portion of said chamber and in communication with a respective fitting opening outwardly on said housing, said transverse passages of each valving device respectively communicating in said second position thereof with a portion of said ampule passage portion between said vertically spaced apart valving devices to communicate said respective fittings with one another via said ampule passage portion of said chamber.

14. The process vessel of claim 12 wherein one of said pair of valving devices includes a valving member rotatably received sealingly in said housing, said housing defining a stepped bore receiving said valving member, and said valving member including a cylindrical portion sealingly received in said stepped bore and defining said bore for said valving device and said ampule passage portion of said chamber intersecting therewith.

15. The process vessel of claim 14 wherein said housing includes a shoulder adjacent to said stepped bore, said valving member including a barb portion engaging said shoulder to retain said valving member sealingly in said stepped bore.

16. The process vessel of claim 1, and a canister for receiving and sealingly enclosing said process vessel.

17. The process vessel of claim 16, and a holder configured to be received into said canister along with said process vessel to support the latter in a vertical orientation within said canister.

18. The process vessel of claim 1 wherein said tissues are adipose fat tissues, and said identifiable cells are microvessel cells.

19. A process vessel assembly for separating and concentrating microvessel cells from fat tissue harvested from a human donor preparatory to use of said microvessel cells to coat an inner luminal surface of a graft to be implanted in said human donor, said process vessel assembly including:

(a) a process vessel canister including both a bowl-like portion defining a chamber and an upper opening to said chamber, and a lid portion sealingly engageable with said bowl-like portion to span and close said opening;

(b) a process vessel for receiving, cleansing, digesting, and centrifuging said fat tissue to separate and concentrate said microvessel cells, said process vessel being receivable into said chamber of said process vessel canister, said process vessel comprising;

(i) a housing defining a process chamber, said process chamber including a lower conical portion; and

(ii) a screen basket including a conical portion defining a lower part of said screen basket, said screen basket and its conical portion positioned in said process chamber and its lower conical portion to define a gap separating said screen basket from said housing, the size of said gap being substantially consistent across the screen basket and its conical portion; and

(c) a holder for supporting said process vessel in a vertical position both on a horizontal support surface and in said process vessel canister, said holder engaging said bowl-like portion to limit movement of said process vessel in said chamber during centrifuging of said process vessel assembly to separate and concentrate said microvessel cells from said fat tissue.

20. The process vessel assembly of claim 19 wherein said process chamber includes an upper cylindrical portion and an ampule passage portion descending from said lower conical portion;

and wherein said screen basket further includes an upper cylindrical portion.

21. The process vessel assembly of claim 20 wherein said screen basket is made of mesh material in which the size of its openings range from 20 to 800 microns.

22. The process vessel assembly of claim 21 wherein said screen basket is made of mesh material in which the size of its openings range from 200 to 500 microns.

23. The process vessel assembly of claim 22 wherein said screen basket is made of mesh material in which the size of its openings is about 350 microns.

24. The process vessel assembly of claim 23 wherein said screen basket is made of mesh material fabricated of polymer material.

25. The process vessel assembly of claim 24 wherein said polymer material is selected from the group consisting of polyester, polypropylene, polyethylene, nylon, and fluoropolymers.

26. The process vessel assembly of claim 20 wherein said screen basket is free of reinforcing ribs and includes substantially only a single horizontal or vertical seam, whereby microvessel cells separated by digestion from said fat tissue are not significantly trapped or retained on reinforcing ribs or seams of said screen basket.

27. The process vessel assembly of claim 26 wherein said screen basket includes only a single horizontal seam between said cylindrical and said conical portions and a single vertical seam.

28. The process vessel assembly of claim 20 wherein said housing further includes a pair of vertically spaced apart valving devices which each include a respective bore defining a portion of said ampule passage portion of said chamber in a first position for said valving devices.

29. The process vessel assembly of claim 28 wherein said pair of valving devices also each include a transverse passage defining a T-intersection with said respective bore of the valving device in a second position of said valving devices, said respective bores being disposed out of communication with said ampule passage portion of said chamber and in communication with a respective fitting opening outwardly on said housing, said transverse passages of each valving device respectively communicating in said second position thereof with a portion of said ampule passage portion between said vertically spaced apart valving devices to communicate said respective fittings with one another via said ampule passage portion of said chamber.

30. The process vessel assembly of claim 29 wherein one of said pair of valving devices includes a valving member rotatably received sealingly in said housing, said housing defining a stepped bore receiving said valving member, and said valving member including a cylindrical portion sealingly received in said stepped bore and defining said bore for said valving device and said ampule passage portion of said chamber intersecting therewith.

31. The process vessel assembly of claim 30 wherein said housing includes a shoulder adjacent to said stepped bore, said valving member including a barb portion engaging said shoulder to retain said valving member sealingly in said stepped bore.