Fail safe system for operating medical fluid valves
First Claim
1. A system for operating a series of valves in cooperation with a pump that pumps fluid to and from a patient, the valves including a supply valve, a drain valve, a from-patient valve and a to-patient valve, the cam arrangement comprising:
- a disposable cassette including the supply valve, the drain valve, the from-patient valve and the to-patent valve;
a camshaft; and
a series of cams connected to the camshaft, the cams positioned and arranged to toggle back and forth between;
a first open position for the supply valve and a second open position for the drain valve,a third open position for the from-patient valve and the second open position, andthe first open position and a fourth open position for the to-patient valve.
3 Assignments
0 Petitions
Accused Products
Abstract
A method, system and apparatus for performing peritoneal dialysis are provided. To this end, in part, a cam arrangement for operating a series of valves in cooperation with a pump that pumps fluid to and from a patient, the valves including a supply valve, a drain valve, a from-patient valve and a to-patient valve is provided. The cam arrangement includes a camshaft and a series of cams connected to the camshaft. The cams are positioned and arranged to toggle back and forth between a first open position for the supply valve and a second open position for the drain valve, a third open position for the from-patient valve and the second open position, and the first open position and a fourth open position for the to-patient valve.
204 Citations
19 Claims
-
1. A system for operating a series of valves in cooperation with a pump that pumps fluid to and from a patient, the valves including a supply valve, a drain valve, a from-patient valve and a to-patient valve, the cam arrangement comprising:
-
a disposable cassette including the supply valve, the drain valve, the from-patient valve and the to-patent valve; a camshaft; and a series of cams connected to the camshaft, the cams positioned and arranged to toggle back and forth between; a first open position for the supply valve and a second open position for the drain valve, a third open position for the from-patient valve and the second open position, and the first open position and a fourth open position for the to-patient valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of operating a series of valves to pump fluid to and from a patient comprising the steps of:
-
(a) sequentially toggling a camshaft between a first open position for a from-patient valve and a second open position for a drain valve to drain fluid from a patient, the from-patient valve and the drain valve provided in a disposable cassette; and (b) sequentially toggling the camshaft between a third open position for a supply valve and a fourth open position for a to-patient valve to fill the patient with fluid, the supply valve and the to-patient valve provided in a disposable cassette. - View Dependent Claims (11, 12, 13, 14, 15, 16)
-
-
17. An automated medical fluid system comprising:
-
a disposable cassette including a series of valves; a camshaft that operates the valves; a motor that drives the camshaft; and a controller that operates with the motor to; sequentially toggle the camshaft between a first open position for a from-patient valve and a second open position for a drain valve to drain fluid from a patient; and sequentially toggle the camshaft between a third open position for a supply valve and a fourth open position for a to-patient valve to fill the patient with fluid.
-
-
18. A medical fluid system comprising:
-
a disposable cassette including at least one flexible membrane attached to a rigid piece, the flexible membrane attached to a rigid piece and a plurality of valves; a camshaft that operates the valves; a motor that drives the camshaft; and a processor that operates with the motor. - View Dependent Claims (19)
-
Specification