Zero net external displacement implantable pump and driver

• US 5,073,094 A
• Filed: 11/17/1987
• Issued: 12/17/1991
• Est. Priority Date: 11/17/1987
• Status: Expired due to Term

• Current Assignee: Regents of The University of Minnesota Minneapolis Minnesota
• Original Assignee: Regents of The University of Minnesota (University of Minnesota)
• Inventors: Wigness, Bruce D., Dorman, Frank D.
• Primary Examiner(s): Bertsch, Richard A.
• Application Number:
  US07/121,649
• Time in Patent Office: 1,491 Days
• Field of Search: 417/412, 417/413, 417/472, 417/473, 417/481, 417/482, 92/34, 623/3, 604/131, 604/134, 604/151, 604/153, 604/891.1
• US Class Current: 417/412
• CPC Class Codes: A61M 2202/0401 Ascitics
• CPC Class Codes: A61M 27/002 Implant devices for drainage of body fluids from one part of the body to another intraocular A61F9/00781; middle ear A61F11/202
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: F04B 43/086 with two or more tubular flexible members in parallel F04B43/1136 takes precedence
• CPC Class Codes: F04B 9/045 the means being eccentrics

Abstract

A zero net external displacement implantable pump for the transfer of accumulated body fluids, such as transfer of ascites fluid from the peritoneum to the vasculative system. The pump includes a pair of bellows type displacement chambers which are alternately compressed and expanded by action of a pivoted rocker member. The fluid to be transferred is drawn into the chambers on the expansion strokes and expelled on the compression strokes. The rocker member may be operated manually or power driven. Single action and double action pumps are disclosed.

Claims

1. An implantable anti-reflux fluid displacement compression pump-catheter system which comprises:

A) a body fluid collecting device;

B) a zero net external displacement pump including;

1) a pair of bellows chambers in adjacent side-by-side relation, each of said chambers having one generally flat wall which is substantially coplanar with the corresponding wall of the adjacent chamber;

2) an inlet to and a discharge outlet from each of said chambers;

3) a check valve in each of the inlet and outlet flow lines regulating one way flow through the pump; and

4) a single rocker plate overlying the coplanar walls of both of said chambers and pivotable on an axis between said chambers to permit alternate compression and expansion of each of the chambers, said pump being enclosed in an implantable housing including;

a) a cavity adapted to receive said pump;

b) pivot means journaling said rocker plate for limiting rocking motion within said cavity;

c) crank arm and link drive means operatively connected to said rocker plate; and

d) battery driven motor means for rotating said crank arm;

C) a tubular connection between said fluid collecting device and said pump; and

D) a catheter connected to said pump for distribution of collected body fluid to a selected body site.

2. A system according to claim 1 wherein said pump bellows chambers are collapsible elastomeric pouches.

3. A system according to claim 1 wherein the pump is a single action pump, the chambers of the pump are interconnected by a flow passage, and the discharge outlet from the first chamber and the inlet to the other chamber are connected to said passage.

4. A system according to claim 1 wherein the pump is a double action pump, the chambers of the pump are independent one from the other, the inlets to both chambers are adapted for connection to a single source of fluid to be pumped and the discharge outlets of both chambers are adapted for connection to a single discharge flow line chamber.

5. A system according to claim 1 wherein a cylindrical bellows composed of a plurality of interconnected circular rings is disposed within said cavity and said pump is disposed within said bellows.

6. An implantable anti-reflux fluid displacement compression pump-catheter system which comprises:

A) a body fluid collecting device;

B) a single action zero net external displacement pump including;

1) a pair of bellows chambers in adjacent side-by-side relation, each of said chambers having one generally flat wall which is substantially coplanar with the corresponding wall of the adjacent chamber;

2) an inlet to the first of said chambers and a discharge outlet from the other of said chambers;

3) a passage connecting said chambers;

4) a check valve in each of the inlet and outlet and connecting passage flow lines regulating one way flow through the pump; and

5) a single rocker plate overlying the coplanar walls of both of said chambers and pivotable on an axis between said chambers to permit alternate compression and expansion of each of the chambers;

said pump being enclosed in an implantable housing including;

a) a cavity adapted to receive said pump;

b) pivot means journaling said rocker plate for limited rocking motion within said cavity;

c) crank arm and link drive means operatively connected to said rocker plate; and

d) battery driven motor means for rotating said crank arm;

C) a tubular connection between said fluid collecting device and said inlet to the first pump chamber; and

D) a catheter connected to the discharge outlet of said other pump chamber for distribution of collected body fluid to a selected body site.

7. A system according to claim 6 wherein said pump bellows chambers are collapsible elastomeric pouches.

8. A system according to claim 6 wherein a cylindrical bellows composed of a plurality of interconnected circular rings is disposed within said cavity and said pump is disposed within said bellows.

9. An implantable anti-reflux fluid displacement compression pump-catheter system which comprises:

A) a body fluid collecting device;

B) a double action zero net external displacement pump including;

1) a pair of bellows chambers in adjacent side-by-side relation, each of said chambers having one generally flat wall which is substantially coplanar with the corresponding wall of the adjacent chamber, and said chambers being independent one from the other;

2) separate inlets to each of said chambers, said inlets being adapted for connection to a single source of fluid to be pumped;

3) separate discharge outlets from each of said chambers, said outlets being adapted for connection to a single discharge flow line;

4) a check valve in each of the inlet and outlet flow lines regulating one way flow through each of the chambers; and

5) a single rocker plate overlying the coplanar walls of both of said chambers and pivoted on an axis between said chambers to permit alternate compression and expansion of each of the chambers;

said pump being enclosed in an implantable housing including;

a) a cavity adapted to receive said pump;

b) pivot means journaling said rocker plate for limited rocking motion within said cavity;

c) crank arm and link drive means operatively connected to said rocker plate; and

d) battery driven motor means for rotating said crank arm;

C) a tubular connection between said fluid collecting device and each of said inlets; and

D) a catheter connected to said discharge flow line for distribution of body fluid to a body site.

10. A system according to claim 9 wherein said bellows chambers are collapsible elastomeric pouches.

11. A system according to claim 9 wherein a cylindrical bellows comprised of a plurality of interconnected circular rings is disposed within said cavity and said pump is disposed within said bellows.

12. A zero net external displacement pump for implantation within a living animal body for use in an anti-reflux fluid displacement compression pump-catheter system, said pump comprising:

A) a flat generally cylindrical base member having top faces tapering downwardly from a diametric center line;

B) a groove along said center line;

C) a flat generally cylindrical elastomeric bladder surrounding said base member in close generally fluid tight engagement with the bottom and side walls of the base member and defining a pair of bellows chambers in adjacent side-by-side relation;

D) an internal diametric tongue depending from the top wall of said bladder in generally fluid tight engagement with the diametric groove in the base member;

E) bellows pleats in the sides of said bladder;

F) a fluid inlet passage to and discharge outlet passage from each of said chambers formed within said base member;

G) a check valve in each of the inlet and outlet passages regulating one way flow through the pump; and

H) a rocker plate overlying both of said bellows chambers and pivotable on an axis between said chambers to permit alternate compression and expansion of each of the chambers.

13. A pump according to claim 12 wherein said elastomeric bladder is formed from silicone rubber.

14. A single action zero net external displacement pump for implantation within a living animal body for use in an anti-reflux fluid displacement compression pump-catheter system, said pump comprising:

A) a flat generally cylindrical base member having top faces tapering downwardly from a diametric center line;

B) a groove along said center line;

C) a flat generally cylindrical elastomeric bladder surrounding said base member in close generally fluid tight engagement with the bottom and side walls of the base member and defining a pair of bellows chambers in adjacent side-by-side relation;

D) an internal diametric tongue depending from the top wall of said bladder in generally fluid tight engagement with the diametric groove in the base member;

E) bellows pleats in the side of said bladder;

F) a fluid inlet passage to the first of said chambers and a discharge outlet passage from the other of said chambers, said passages formed within said base member;

G) a passage within said base member connecting said chambers;

H) a check valve in each of the inlet and outlet and connecting passage flow lines regulating one way flow through the pump; and

I) a rocker plate overlying both of said bellows chambers and pivotable on an axis between said chambers to permit alternate compression and expansion of each of the chambers.

15. A pump according to claim 14 wherein said elastomeric bladder is formed from silicone rubber.

16. A double action zero net external displacement pump for implantation within a living animal body for use in an anti-reflux fluid displacement compression pump-catheter system, said pump comprising:

A) a flat generally cylindrical base member having top faces tapering downwardly from a diametric center line;

B) a groove along said center line;

C) a flat generally cylindrical elastomeric bladder surrounding said base member in close generally fluid tight engagement with the bottom and side walls of the base member and defining a pair of bellows chambers in adjacent side-by-side relation, said chambers being independent one from the other;

D) an internal diametric tongue depending from the top wall of said bladder in generally fluid tight engagement with the diametric groove in the base member;

E) bellows pleats in the sides of said bladder;

F) separate fluid inlet passages to each of said bellows chambers, said inlet passages being adapted for connection to a single source of fluid to be pumped;

G) separate fluid discharge outlet passages from each of said chambers, said outlet passages being adapted for connection to a single discharge flow line;

H) a check valve in each of the inlet and outlet passage flow lines regulating one way flow through each of the chambers; and

I) a rocker plate overlying both of said bellows chambers and pivoted on an axis between said chambers to permit alternate compression and expansion of each of the chambers.

17. A pump according to claim 16 wherein said elastomeric bladder is formed from silicone rubber.