Medication delivery system comprising a combined medication reservoir, pump assembly and an actuator allowing continuous fluid communication through the pump assembly

• US 7,497,842 B2
• Filed: 11/04/2003
• Issued: 03/03/2009
• Est. Priority Date: 02/23/2001
• Status: Active Grant

• Current Assignee: Stryker Corporation
• Original Assignee: Stryker Corporation
• Inventors: Diaz, Luis A., Hershberger, David
• Primary Examiner(s): Sirmons; Kevin C.
• Assistant Examiner(s): GRAY, PHILLIP A
• Application Number:
  US10/701,207
• Publication Number:
  US 20040106902A1
• Time in Patent Office: 1,946 Days
• Field of Search: 604/131, 604/141, 604/151, 604/153, 604/236, 604/267, 604/30, 604/33, 604/67, 604/123
• US Class Current: 604/151
• CPC Class Codes: A61M 39/16 having provision for disinfection or sterilisation A61M39/143 takes precedence; methods or apparatus for disinfection or sterilisation A61L2/00
• CPC Class Codes: A61M 39/223 Multiway valves
• CPC Class Codes: A61M 5/14216 Reciprocating piston type
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/1684 by detecting the amount of infusate remaining, e.g. signalling end of infusion
• CPC Class Codes: A61M 5/16854 by monitoring line pressure

Abstract

A medication delivery system that includes a housing and a reservoir fitted to the housing for storing the medication. A pump for delivering the medication is attached to the housing. Valves regulate fluid flow into and out of the pump. The valves are configured so that when fluid flows into the pump, flow out of the pump is blocked and, when flow into the pump is blocked, fluid can flow out of the pump. A port in communication with the reservoir serves as the conduit through which sterilization fluid is introduced into the reservoir and the pump. An actuator is attached to the housing. The actuator engages the valves to simultaneously hold both valves open. Thus, during sterilization, sterilization fluid simultaneously flows through into and out of the pump.

Claims

1. A medication delivery system for delivering medication to a patient, said system comprising:

a base housing with a reservoir for storing medication;

a pump assembly attached to said base housing, said pump assembly having;

a pump chamber that is in a permanently fixed position relative to said base housing;

a pump head moveably mounted to said base housing to force fluid out of the pump chamber;

an inlet connecting the reservoir to the pump chamber;

an outlet from the pump chamber;

an inlet valve for regulating fluid flow through the inlet;

an outlet valve for regulating fluid flow through the outlet;

a valve regulator for regulating said valves so that when one said valve is an open state, the other said valve is in the closed state; and

a rigid actuator moveably mounted to said base housing adjacent said pump assembly that is not connected to said valve regulator for displacement by said valve regulator, said actuator having a first position in which said actuator simultaneously abuts both said inlet and outlet valves to simultaneously hold both said valves in the open state and a second position wherein said actuator is spaced from said valves so that said valves are able to cycle between the open and closed states.

2. The medication delivery system of claim 1, wherein at least one of said inlet or outlet valves is a pinch valve.

3. The medication delivery system of claim 1, wherein said pump head includes at least one piston that moves in a reciprocal pattern.

4. The medication delivery system of claim 1, further including:

a port housing attached to said base housing, said port housing having;

a first port connected to said pump to receive fluid flow from the pump outlet; and

a second port in fluid communication with the first port, the second port configured for receiving a tube set through which medication is delivered to the patient; and

a plunger moveably attached to said base housing, said plunger positioned to selectively abut said actuator to move said actuator from said first position to said second position.

5. The medication delivery system of claim 4, wherein said plunger is positioned so that, when the tube set is attached to said port housing, said tube set abuts said plunger so as to displace said plunger.

6. The medication delivery system of claim 4, wherein:

said port housing includes a fluid chamber located between the first port and the second port; and

said plunger is at least partially disposed in the port housing fluid chamber.

7. A medication delivery system for delivering medication to a patient, said system comprising:

a base housing having a reservoir for storing medication;

a pump assembly attached to said base housing, said pump assembly having;

a pump chamber that is defined by a structural member fixedly mounted to said base housing;

an inlet from the reservoir into the pump chamber;

an outlet from the pump chamber; and

a pump head moveably mounted in the pump chamber; and

a valve assembly attached to said base housing;

said valve assembly including;

an inlet valve for regulating fluid flow through the pump assembly inlet; and

an outlet valve for regulating fluid flow through the pump assembly outlet;

a drive assembly for actuating said pump head and said valves, said drive assembly configured to actuate said valves so that when said inlet valve is in an open state, said outlet valve is in a closed state and, when said outlet valve is in an open state, said inlet valve is in a closed state; and

a rigid actuator rod movingly mounted to said base housing, said actuator rod being disconnected from said drive assembly for movement by said drive assembly and having an engaged state wherein said actuator rod simultaneously butts against both said valves to simultaneously hold said valves in the open state and a disengaged state wherein said actuator rod is spaced from both said valves to allow both said valves to cycle between the open and closed states.

8. The medication delivery system of claim 7, further including a plunger moveably mounted to said base housing, said plunger positioned to move said actuator rod from the engaged state to the disengaged state.

9. The medication delivery system of claim 7, further including:

a port housing mounted to said base housing, said port housing having an outlet port in fluid communication with the pump assembly outlet, said outlet port configured to receive a tube set through which medication is delivered; and

a plunger moveably mounted to said housing and positioned to be displaced upon attachment of the tube set to the port housing outlet port and further positioned to drive said actuator rod, so that, upon attachment of the tube set to the port housing outlet port, said plunger is displaced so that said plunger drives said actuator rod from the engaged state to the disengaged state.

10. The medication delivery system of claim 7, further including:

a port housing attached to said base housing, said port housing having;

a first port in fluid connection with said reservoir;

a second port connected to the pump assembly outlet port; and

a third port, the third port configured to receive a tube set through which medication is delivered; and

a valve member disposed in said port housing said valve member having a first position for establishing a fluid communication path between said first port and said third port and second position for establishing a fluid communication path between said second port and said third port.

11. The medication delivery system of claim 10, further including a driver that is moveably coupled to said valve member and that extends to said actuator rod, said driver positioned so that, when said valve member is actuated to establish a fluid communications path between the port housing second port and the port housing third port, said driver displaces said actuator rod from the engaged state to the disengaged state.

12. The medication delivery system of claim 10, wherein said valve member has a third position for preventing communication path between said third port and said first and second ports.

13. A medication delivery system for delivering medication to a patient, said system including:

a base housing;

a reservoir integral with said base housing, said reservoir having a void space for holding medication;

a pump assembly attached to said base housing, said pump assembly including;

a pump chamber having an inlet through which fluid is received from the reservoir void space and outlet through which fluid is discharged; and

a pump head moveably disposed in the pump chamber for forcing fluid from the inlet through the outlet;

an inlet valve for regulating fluid flow through the pump chamber inlet;

an outlet valve for regulating fluid flow through the pump chamber outlet;

a drive assembly for actuating said pump head, said inlet valve and said outlet valve, said drive assembly configured to actuate said inlet and outlet valves so that, when said inlet valve is in an open state, said outlet valve is in a closed state and, when said outlet valve is in an open state, said inlet valve is in a closed state;

a port housing attached to said base housing, said port housing having a first port that is in fluid communication with the pump chamber outlet and that is configured to receive a tube set through which medication is delivered;

a rigid actuator moveably mounted to said base housing that is disconnected from said drive assembly for movement by said drive assembly, said actuator having an engaged position wherein said actuator engages said inlet valve and said outlet valve to simultaneously hold both said valves in the open state and a disengaged position wherein said actuator allows both said valves to cycle between the open and closed states; and

a plunger moveably mounted to said base housing and positioned to be displaced upon attachment of tube set to the port housing first port, said plunger positioned to, upon displacement, drive said actuator from the engaged position to the disengaged position.

14. The medication delivery system of claim 13, wherein at least one of said inlet valve or said outlet valve is a pinch valve.

15. The medication delivery system of claim 13, wherein said pump head includes at least one piston that moves in a reciprocal pattern.

16. The medication deliver system of claim 13, wherein:

said port housing includes a second port in fluid communication with the reservoir void space and a third port in fluid communication with the pump chamber outlet; and

a port valve moveably attached to said port housing for establishing a fluid communications path between the port housing first port and the port housing second port or between the port housing first port and the port housing third port.

17. The medication delivery system of claim 16, wherein said port valve selectively prevents fluid communication between said first port and said second port and said third port.

18. The medication delivery system of claim 16, wherein said plunger is coupled to said port valve so that, when said port valve is actuated to establish a fluid communications path between the port housing first port and the port housing third port, said plunger moves so as to displace said actuator.

19. The medication delivery system of claim 16, wherein said plunger and said port valve are a single component, the component having a section disposed in said port housing that functions as said port valve and a section that extends outside of said port housing that functions as said plunger.