Drug delivery system

• US 4,559,038 A
• Filed: 10/19/1984
• Issued: 12/17/1985
• Est. Priority Date: 10/19/1984
• Status: Expired due to Term

• Current Assignee: Smiths Medical MD Incorporated (ICU Medical Incorporated)
• Original Assignee: Deltec Systems Incorporated
• Inventors: Leslie, James E., Peterson, Lyle, Berg, Harvey F.
• Primary Examiner(s): Gantz, D. E.
• Assistant Examiner(s): McFarlane, Anthony
• Application Number:
  US06/663,050
• Time in Patent Office: 424 Days
• Field of Search: 604/151-153, 604/34, 604/250, 604/131, 417/474, 417/476, 417/477, 417/478
• US Class Current: 604/153
• CPC Class Codes: A61M 2005/14533 cam actuated
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps

Abstract

A system for delivering a drug to a patient according to the preferred embodiment of the present invention is shown as being of modular construction including a control module and a reservoir module. The reservoir module is removably secured to the control module by a removable hinge member at one end and a locking member at the other end. The reservoir module includes a pressure plate upon which a tube extending from a drug container bag to the patient is supported. The control module includes a pumping mechanism including a camshaft which reciprocates valves and an expulsor in the control module. The valves and expulsor engage and interact with the tube located on the pressure plate for forcing the drug from the drug container bag to the patient. In its most preferred form, the pressure plate includes standoffs which abut with the pump chassis for insuring proper spacing maintenance between the pressure plate of the reservoir module and the control module. The cam shaft is driven by a motor controlled by electronic controls included in the control module which may be preprogrammed to deliver a precise amount of drug over a specific period of time. The drug delivery system of the present invention may be removably secured to the patient allowing the patient to be ambulatory while being administered drugs.

Claims

1. Modular system for delivering a drug to a patient comprising, in combination:

a reservoir module, with the reservoir module comprising, in combination;

a container for storing a drug to be delivered by the system, a tube for providing communication between the drug storage container and the patient, and a pressure plate, with the communication providing tube being located and supported on the pressure plate;

a control module, with the control module comprising, in combination;

a chassis including a first aperture and second and third apertures located on opposite sides of the first aperture;

a camshaft rotatably mounted to the chassis having a first cam portion and second and third cam portions located on opposite sides of the first cam portion;

an expulsor reciprocably mounted in the first aperture of the chassis for engagement with the first cam portion and for interaction with the communication providing tube;

first and second valves reciprocably mounted in the second and third apertures of the chassis for engagement with the second and third cam portions and for interaction with the communication providing tube, and means for rotating the camshaft for reciprocating the expulsor and valves in the apertures of the chassis;

means for removably securing the pressure plate of the reservoir module to the chassis of the control module, with the expulsor and the valves of the control module interacting with the communication providing tube on the pressure plate of the reservoir module when the reservoir module is removably secured to the control module for forcing the drug stored in the drug storage container through the communication providing tube at desired rates to the patient.

2. The drug delivery system of claim 1 wherein the removably securing means comprises, in combination:

means for removably attaching the pressure plate of the reservoir module to the chassis of the control module along one end, with the removably attaching means having a first position wherein the reservoir module and the control module are separable from each other and a second position wherein the reservoir module and the control module are interconnected and nonseparable from each other; and

means for holding the reservoir module, and the control module in their second position.

3. The drug delivery system of claim 2 wherein the holding means comprises, in combination:

a lock mechanism.

4. The drug delivery system of claim 3 wherein the removably attaching means comprises, in combination:

hinge means, with the hinge means comprising, in combination;

hinge pins located on one of the pressure plate of the reservoir module and the chassis of the control module; and

hooked portions complementary to and for receipt on the hinge pins located on the other of the pressure plate of the reservoir module and the chassis of the control module.

5. The drug delivery system of claim 1 wherein the reservoir module further comprises, in combination:

means for insuring proper spacing maintenance between the pressure plate of the reservoir module and the chassis of the control module for the efficient and advantageous interaction of the expulsor and the valves of the control module with the communication providing tube of the reservoir module.

6. The drug delivery system of claim 5 wherein the spacing maintenance insuring means comprises, in combination:

at least first and second standoffs formed on the pressure plate for abutting with the chassis of the control module when the reservoir module and the control module are in their second position, with the first standoff abutting with the chassis of the control module between the first and second apertures and the second standoff abutting with the chassis of the control module between the first and third apertures.

7. The drug delivery system of claim 1 wherein the control module further includes a casing, with the casing having a generally open bottom, with the chassis having a size and shape complementary to and for receipt in the generally open bottom of the casing of the control module;

and wherein the drug delivery system further comprises, in combination;

means for sealing between the casing and the chassis; and

means for sealing between the apertures of the chassis and the expulsor and the valves wherein a substantially water tight compartment is formed and defined by the casing and the chassis of the control module.

8. The drug delivery system of claim 1 wherein the means for sealing between the apertures of the chassis and the expulsor and the valves comprises, in combination:

a closed cell foam gasket having apertures corresponding to the first, second, and third apertures of the chassis and for the reciprocal receipt of the expulsor and the first and second valves, with the expulsor and the first and second valves having head portions for abutting with the gasket located on the chassis of the control module.

9. The drug delivery system of claim 8 wherein the gasket has sufficient resiliency to bias the expulsor and the first and second valves against the cam portions.

10. Modular system for delivering a drug to a patient comprising, in combination:

a control module;

a reservoir module;

means for removably securing the reservoir module to the control module;

with the reservoir module comprising, in combination;

a container for storing a drug to be delivered by the system, and means for providing communication between the drug storage container and the patient;

with the control module comprising, in combination;

means for forcing the drug stored in the drug storage container through the communication providing means at desired rates to the patient, with the drug forcing means of the control module interacting with the communication providing means of the reservoir module when the reservoir module is removably secured to the control module for purposes of delivering a drug stored in the drug storage container to the patient at desired rates.

11. The drug delivery system of claim 10 wherein the removably securing means comprises, in combination:

means for removably attaching the reservoir module to the control module along one end, with the removably attaching means having a first position wherein the reservoir module and the control module are separable from each other and a second position wherein the reservoir module and the control module are interconnected and nonseparable from each other; and

means for holding the reservoir module and the control module in their second position.

12. The drug delivery system of claim 11 wherein the holding means comprises, in combination:

a lock mechanism.

13. The drug delivery system of claim 12 wherein the removably attaching means comprises, in combination:

hinge means, with the hinge means comprising, in combination;

hinge pins located on one of the reservoir module and the control module; and

hooked portions complementary to and for receipt on the hinge pins located on the other of the reservoir module and the control module

14. The drug delivery system of claim 13 wherein the reservoir module includes a pressure plate, with the communication providing means being located and supported on the pressure plate, with the drug forcing means of the control module interacting with the communication providing means on the pressure plate, with the pressure plate including the hooked portions of the hinge means.

15. The drug delivery system of claim 14 wherein the reservoir module further comprises, in combination:

means for insuring proper spacing maintenance between the pressure plate and the control module for the efficient and advantageous interaction of the drug forcing means of the control module with the communication providing means.

16. The drug delivery system of claim 15 wherein the spacing maintenance insuring means comprises, in combination:

at least a first standoff formed on the pressure plate for abutting with the control module when the reservoir module and the control module are in their second position.

17. The drug delivery system of claim 16 wherein the drug forcing means comprises, in combination:

a camshaft having a first cam portion and second and third cam portions located on opposite sides of the first cam portion;

an expulsor reciprocably mounted in the control module for engagement with the first cam portion and for interaction with the communication providing means;

first and second valves reciprocably mounted in the control module for engagement with the second and third cam portions and for interaction with the communication providing means; and

means for rotating the camshaft for reciprocating the expulsor and valves in the control module.

18. The drug delivery system of claim 17 wherein the drug forcing means further comprises, in combination:

a chassis;

with the chassis including a first aperture for reciprocably receiving the expulsor and second and third apertures located on opposite sides of the first aperture for reciprocably receiving the first and second valves wherein the spacing maintenance insuring means further comprises, in combination;

a second standoff;

with the first standoff abutting with the chassis of the control module between the first and second apertures and the second standoff abutting with the chassis of the control module between the first and third apertures.

19. The drug delivery system of claim 18 wherein the control module further includes a casing, with the casing having a generally closed top, a generally closed first sidewall, a generally closed second sidewall, a generally closed third sidewall, a generally closed fourth sidewall, and a generally open bottom, with the chassis of the drug forcing means having a size and shape complementary to and for receipt in the generally open bottom of the casing of the control module;

and wherein the drug delivery system further comprises, in combination;

means for sealing between the sidewalls of the casing and the chassis; and

means for sealing between the apertures of the chassis and the lifters wherein a substantially water tight compartment is formed and defined by the sidewalls and the top of the casing and the chassis of the control module.

20. The drug delivery system of claim 19 wherein the communication providing means comprises, in combination:

a tube extending from the drug container to the patient.

21. The drug delivery system of claim 20 wherein the standoffs include first and second portions which are spaced apart a distance equal to and for receipt of the tube therebetween to insure the tube is positioned on the pressure plate to insure complete contact of the expulsor and valves of the control module with the tube at all times when the reservoir module and the control module are located in their second position.