Pressure sensitive valves for extracorporeal pumping
First Claim
1. An improved pump loop for use with a roller pump for extracorporeal circulation;
- said loop comprising;
(a) a first tubing segment for insertion in a roller pump for pumping extracorporeal fluids there through, said tubing having a pump inlet and a pump outlet;
(b) a shunt tubing for fluid connection of said pump outlet to said pump inlet;
(c) a pressure relief valve for closing said shunt tubing below a predetermined pressure.
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Accused Products
Abstract
The specification describes several uses for pressure sensitive valves during extracorporeal pumping in one embodiment, an improved pumping loop for a roller pump is used in an extracorporeal circuit with a pressure relief valve and pump tubing. The inlet and outlet of the tubing are connected respectively to the outlet and inlet of said valve via two 3 way connections, across the outlet of the pump. The pumping loop allows recirculation of pumped liquid between the inlet and outlet of the pump when the outlet pressure generated by said pump exceeds a set value thereby limiting the pump outlet pressure to the set pressure. The pressure relief valve can also be placed at the inlet if the pump to protect the circuit from excess negative pressure that the pump can generate. The pressure relief valve in combination with the pump loop provides an accurate means to dynamically set the occlusion of the tubing within the roller pump.
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Citations
29 Claims
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1. An improved pump loop for use with a roller pump for extracorporeal circulation;
- said loop comprising;
(a) a first tubing segment for insertion in a roller pump for pumping extracorporeal fluids there through, said tubing having a pump inlet and a pump outlet; (b) a shunt tubing for fluid connection of said pump outlet to said pump inlet; (c) a pressure relief valve for closing said shunt tubing below a predetermined pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- said loop comprising;
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17. A device for use with a roller pump in extracorporeal circulation;
- said device comprising;
(a) a first tubing segment for insertion in a roller pump for pumping extracorporeal fluids there through, said tubing having pump inlet and pump outlet; (b) a shunt tubing for fluid connection of said pump outlet to said pump inlet; (c) a pressure relief valve for closing said shunt tubing below a predetermined pressure; (d) first means for indicating fluid flow from said pump outlet to said pump inlet through said shunt tubing. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
- said device comprising;
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26. An improved pump loop for use with a roller pump in extracorporeal circulation, said loop comprising:
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(a) a first tubing segment for insertion in a roller pump for pumping extracorporeal fluids therethrough, said tubing having a first 3-way connector at the pump outlet and a second 3-way connector at the pump inlet; (b) a pressure relief valve with an inlet and an outlet, said inlet connected to said first 3-way connector and said outlet connected to said second 3-way connector, said pressure relief valve formed to open in response to a pump outlet pressure above a predetermined value; (c) shunt tubing providing extracorporeal fluid flow between said first 3-way connector, through said pressure relief valve to said second 3-way connector when said pressure relief valve is open; whereby said loop relieves excess pump outlet pressure by venting extracorporeal fluid from said pump outlet to said pump inlet when the pump outlet pressure exceeds a predetermined value.
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27. A system for regulating pressure in an extracorporeal circuit, said system comprising:
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(a) an extracorporeal circuit for circulation of blood, said circuit having at least a plurality of blood compatible tubing members with connectors therebetween for circulation of blood therethrough, said circuit having a plurality of devices for circulating and treating blood, each device having at least a blood inlet side and a blood outlet side; (b) at least one shunt tubing bridging one of said devices and connecting said outlet side to said inlet side. (c) a pressure responsive valve normally closing said shunt tubing below a predetermined pressure; whereby said pressure responsive valve will open to allow blood flow through said shunt with the blood pressure in the shunt is greater than said predetermined pressure.
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28. An adjustable safety device for indicating overpressure conditions in an extracorporeal circuit, said device comprising:
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(a) a first tubing segment for insertion in an extracorporeal circuit for circulating blood from a patient through a plurality of devices; (b) a pump means for circulating blood through said circuit and said tubing segment; (c) a shunt means connecting said first tubing member and a blood reservoir; (d) an adjustable pressure sensitive valve normally closing said shunt below a predetermined pressure; whereby overpressurization is indicated by a flow of blood into said blood reservoir. - View Dependent Claims (29)
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Specification