BLOOD TREATING AND FILTERING APPARATUS

• US 3,593,854 A
• Filed: 12/05/1969
• Issued: 07/20/1971
• Est. Priority Date: 12/05/1969
• Status: Expired due to Term

• Current Assignee: Cobe Cardiovascular Incorporated (LivaNova Plc)
• Original Assignee: Swank Roy Laver
• Inventors: SWANK ROY LAVER
• Application Number:
  US04/882,663
• Time in Patent Office: 592 Days
• US Class Current: 210/326
• CPC Class Codes: A61M 1/3633 Blood component filters, e.g. leukocyte filters
• CPC Class Codes: A61M 5/165 Filtering accessories, e.g. blood filters, filters for infusion liquids A61M1/14 , A61M1/34, A61M1/3627, A61M1/3679, A61M1/3687 take precedence; needle sets with incorporated air inlet filters A61M5/162
• CPC Class Codes: B01D 35/153 Anti-leakage or anti-return valves

Abstract

Stored human blood is treated preliminary to blood transfusions by passing it through a mat of glass wool or other fibrous material which removes from the blood the storage-generated platelet leukocyte aggregates present therein. It is filtered during open heart surgery by passing it through the same material for removal of aggregates and leukocytes and separation of entrained air.

Claims

2. The apparatus of claim 1 wherein the vessel has resiliently deformable sidewalls on the upstream side of the filter assembly adapted to be compressed and re-expanded for pumping blood through the apparatus.

3. downstream from the first mat a second mat of finely subdivided blood-contact material comprising a solid fibrous material the fibers of which are nondegrading to the blood and characterized by the ability selectively to adhere the aggregates, the second mat having a density greater than the first mat for selectively removing aggregates of smaller size,

4. The apparatus of claim 3 wherein the blood clot filter member comprises a dome-shaped screen support at its open end on the first support member, the latter having a central opening through which the first mat projects into the spacing defined by the screen.

5. The apparatus of claim 4 including inwardly extending projections on the first support member engaging the first mat to prevent free escape of the latter into the space defined by the screen.

6. The apparatus of claim 1 including valve means adjacent the outlet port operable to prevent back flow of blood from the outlet port into the vessel.

7. The apparatus of claim 1 wherein the second mat of fibrous material has a density of about 0.1 to 0.4 grams per cc.

8. The apparatus of claim 1 wherein the mat fiber has a diameter not substantially great than about 30 microns, the density of the second mat is about 0.2 grams per cc. and the density of the first mat is about 1/4 - 1/2 the density of the second mat.

9. A high volume, continuous blood filter comprising:

a. upstream and downstream end pieces, b. a tubular body secured between the end pieces to form a chamber, c. an inlet port at the center of the upstream end piece, d. an outlet port below the top of the downstream end piece, e. the inlet and outlet ports thereby enabling substantially horizontal blood flow through the chamber, f. a quantity of blood-filter material between thE end pieces, g. upstream perforated, filter-material-retaining means locating the filter material in the path of the blood flow, h. means spacing apart the downstream retaining means and end piece and forming therebetween a recess at the downstream end of the chamber for separating and collecting air entrained in the blood, and i. air-exhaust port means communicating with the top of the recess for exhausting collected air therefrom.

10. The blood filter of claim 9 wherein spacing means comprises a peripheral boss on the downstream end piece projecting inward therefrom for abutment by the downstream retaining means.

11. The blood filter of claim 9 including means spacing apart the upstream retaining means and end piece and forming therebetween a recess at the upstream end of the chamber.

12. The blood filter of claim 11 wherein the spacing means comprises a peripheral boss on the upstream end piece projecting inward therefrom for abutment by the upstream retaining means.

13. The blood filter of claim 9 including baffle means opposite the inlet port for diffusing the blood laterally over the entire area of the blood filter material.

14. The blood filter of claim 13 wherein the baffle means comprises an imperforate central portion of the upstream retaining means.