Body fluid drainage device
First Claim
1. Apparatus suitable for withdrawing a body fluid from a duct in a patient comprising:
- (a) a frame;
(b) first reciprocating pumping means, mounted on said frame, for pumping body fluid, said first pumping means including a body fluid reservoir and a first piston plugging said fluid reservoir at one end, said fluid reservoir having an opening at the opposite end defining the inlet and outlet of said first pumping means, said first piston being free to move reciprocatingly within said fluid reservoir between an "in" and an "out" position, thereby defining the suction and discharge strokes of said first pumping means;
(c) a body fluid passageway associated with said frame and having an inlet end and an outlet end, said body fluid passageway being in communication with said opening in said body fluid reservoir at a location intermediate the inlet and outlet ends of said body fluid passageway;
(d) second reciprocating pumping means, mounted on said frame, for pumping liquid, said second pumping means including a liquid reservoir and a second piston plugging said liquid reservior at one end, said liquid reservoir having an opening at the opposite end defining the inlet and outlet of said second pumping means, said second piston being free to move reciprocatingly within said liquid reservoir between an "in" and an "out" position;
(e) a liquid passageway associated with said frame and having an intake end and a discharge end, said liquid passageway being in communication with said opening in said liquid reservoir at a location intermediate said intake end and discharge end;
(f) first and second valving means, situated respectively at said body fluid passageway inlet end and outlet end and means operatively connecting said first and second valve means with said first pumping means, for controlling fluid flow therethrough, said first and second valving means each having open and shut positions;
(g) third and fourth valving means, situated respectively, at said liquid passageway intake end and discharge end and means operatively connecting said first and second valve means with said second pumping means, for controlling liquid flow therethrough, said third and fourth valving means each having open and shut positions; and
(h) motor means, mounted on said frame, for operating said first and second pumping means to induce flow through said body fluid passageway and through said liquid passageway,the discharge end of said liquid passageway communicating with said body fluid passageway at a location upstream of the inlet to said first pumping means whereby liquid flowing out of said liquid passageway is commingled with the body fluid in said body fluid passageway as an aliquot of the body fluid is drawn into said body fluid reservoir by the reciprocating action of said first pumping means.
4 Assignments
0 Petitions
Accused Products
Abstract
An apparatus is provided suitable for use in draining liquid from inside the human body. The apparatus incorporates two reciprocating pumps and a pair of inlet and outlet valves driven by a common linkage system. One pump draws fluid from a reservoir of additive fluid and mixes the additive with the fluid drawn from the body by the second pump. The mixture is discharged to a common collection means. A pressure sensor terminates the pumping if the fluid pressure in the flow path joining the apparatus with the body becomes abnormal. The apparatus may be mounted externally on the body of the patient and may be driven by a portable source of power. Major components may be changed quickly and easily if the flow capacity is to be changed or if a component must be replaced.
229 Citations
25 Claims
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1. Apparatus suitable for withdrawing a body fluid from a duct in a patient comprising:
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(a) a frame; (b) first reciprocating pumping means, mounted on said frame, for pumping body fluid, said first pumping means including a body fluid reservoir and a first piston plugging said fluid reservoir at one end, said fluid reservoir having an opening at the opposite end defining the inlet and outlet of said first pumping means, said first piston being free to move reciprocatingly within said fluid reservoir between an "in" and an "out" position, thereby defining the suction and discharge strokes of said first pumping means; (c) a body fluid passageway associated with said frame and having an inlet end and an outlet end, said body fluid passageway being in communication with said opening in said body fluid reservoir at a location intermediate the inlet and outlet ends of said body fluid passageway; (d) second reciprocating pumping means, mounted on said frame, for pumping liquid, said second pumping means including a liquid reservoir and a second piston plugging said liquid reservior at one end, said liquid reservoir having an opening at the opposite end defining the inlet and outlet of said second pumping means, said second piston being free to move reciprocatingly within said liquid reservoir between an "in" and an "out" position; (e) a liquid passageway associated with said frame and having an intake end and a discharge end, said liquid passageway being in communication with said opening in said liquid reservoir at a location intermediate said intake end and discharge end; (f) first and second valving means, situated respectively at said body fluid passageway inlet end and outlet end and means operatively connecting said first and second valve means with said first pumping means, for controlling fluid flow therethrough, said first and second valving means each having open and shut positions; (g) third and fourth valving means, situated respectively, at said liquid passageway intake end and discharge end and means operatively connecting said first and second valve means with said second pumping means, for controlling liquid flow therethrough, said third and fourth valving means each having open and shut positions; and (h) motor means, mounted on said frame, for operating said first and second pumping means to induce flow through said body fluid passageway and through said liquid passageway, the discharge end of said liquid passageway communicating with said body fluid passageway at a location upstream of the inlet to said first pumping means whereby liquid flowing out of said liquid passageway is commingled with the body fluid in said body fluid passageway as an aliquot of the body fluid is drawn into said body fluid reservoir by the reciprocating action of said first pumping means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification