Implantable medication infusion pump with discharge side port

• US 5,527,307 A
• Filed: 04/01/1994
• Issued: 06/18/1996
• Est. Priority Date: 04/01/1994
• Status: Expired due to Term

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Minimed, Inc. (Medtronic Plc)
• Inventors: Srisathapat, Chad, Indravudh, Virote
• Primary Examiner(s): MCDERMOTT, CORRINE MARIE
• Application Number:
  US08/221,569
• Time in Patent Office: 809 Days
• Field of Search: 604/890.1, 604/892.1, 604/93, 604/174, 604/175, 604/283, 604/131, 604/132, 604/133, 604/246, 604/247, 604/891.1
• US Class Current: 604/892.1
• CPC Class Codes: A61M 5/14276 specially adapted for implantation

Abstract

A medication infusion pump is provided of the type adapted for implantation into the body of a patient, and for programmable delivery of a selected medication through a catheter to the patient over an extended period of time. A side port assembly is mounted quickly and easily onto the pump and defines a flow path through which the medication is discharged to the catheter. The side port assembly includes an access port to permit transcutaneous needle access to the discharge flow path, in combination with a check valve to prevent backflow within the discharge flow path. The discharge side access port can be used to flush residue from the catheter, or in combination with a primary refill port on the pump to flush the pump and/or to determine actual pump stroke volume.

Claims

1. An implantable medication infusion pump, comprising:

a pump housing;

a reservoir within said pump housing for receiving and storing a supply of a selected medication;

pump means within said pump housing and defining a pump outlet port, said pump means being for delivering the medication from said reservoir through said outlet port;

a side port assembly mounted on said pump housing and defining a discharge flow path in flow communication with said pump outlet port, an access port to permit transcutaneous needle access to said discharge flow path, and check valve means for preventing fluid backflow within said discharge flow path; and

a catheter connected to said discharge flow path, whereby medication delivered through said pump outlet port passes through said discharge flow path and said catheter to a selected administration site within the body of a patient, said check valve means being located along the discharge flow path between said access port and said catheter.

2. The implantable medication infusion pump of claim 1 wherein said access port permits transcutaneous needle access to said discharge flow path for selectively injecting fluid into and withdrawing fluid from said discharge flow path.

3. The implantable medication infusion pump of claim 1 further including a refill port on said pump housing ,to permit transcutaneous needle access to said reservoir.

4. The implantable medication infusion pump of claim 1 further including a filter mounted along said discharge flow path.

5. The implantable medication infusion pump of claim 1 further include a strain relief fitting for mounting said catheter to said side port assembly and having a converging wall segment formed along a passage through said strain relief fitting, said catheter comprising a resilient lumen having a rigid sleeve fitted into an upstream end thereof, said upstream end of said lumen with said sleeve therein being drawn tightly against said converging wall segment formed along a passage formed through said strain relief fitting.

6. An implantable medication infusion pump, comprising:

a pump housing;

a reservoir within said pump housing for receiving and storing a supply of a selected medication;

pump means within said pump housing and defining a pump outlet port, said pump means being for delivering the medication from said reservoir through said outlet port;

a side port assembly mounted on said pump housing and defining a discharge flow path in flow communication with said pump outlet port, an access port to permit transcutaneous needle access to said discharge flow path, and check valve means for preventing fluid backflow within said discharge flow path; and

a catheter connected to said discharge flow path, whereby medication delivered through said pump outlet port passes through said discharge flow path and said catheter to a selected administration site within the body of a patient;

said pump outlet port being defined by a discharge tube projecting outwardly from said pump housing and wherein said side port assembly includes a slide-fit fitting for sealed connection with said discharge tube.

7. The implantable medication infusion pump of claim 6 wherein said pump housing further includes an outwardly projecting mounting lug having a flanged outboard end, said side port assembly including a casing having a transversely open slot formed therein, and a lock clip receivable into said slot to extend behind said flanged end of said mounting lug when said slide-fit fitting is engaged with said discharge tube, to retain said side port assembly on said pump housing.

8. The implantable medication infusion pump of claim 6 including spring-loaded means for retaining said lock clip within said slot.

9. The implantable medication infusion pump of claim 7 wherein said mounting lug has a cylindrical shape with said discharge tube disposed within said mounting lug.

10. An implantable medication infusion pump, comprising:

a pump housing;

a reservoir within said pump housing for receiving and storing a supply of a selected medication;

pump means within said pump housing and defining a pump outlet port, said pump means being for delivering the medication from said reservoir through said outlet port;

a side port assembly mounted on said pump housing and defining a discharge flow path in flow communication with said pump outlet port, an access port to permit transcutaneous needle access to said discharge flow path, and check valve means for preventing fluid backflow within said discharge flow path; and

a catheter connected to said discharge flow path, whereby medication delivered through said pump outlet port passes through said discharge flow path and said catheter to a selected administration site within the body of a patient;

said access port comprising a port shield defining a generally conical depression with a first needle port formed centrally therein, a needle retainer defining a second needle port disposed in alignment with said first needle port, and a resilient self-sealing septum interposed between said port shield and said needle retainer;

said access port further defining a well formed along said discharge flow path, said needle retainer defining a generally concave conical wall having an apex end with said second needle port formed centrally at said apex end thereof, and a plurality of flow apertures formed in said conical wall, said needle retainer being mounted within said well formed along said discharge flow path, with said second needle port and said flow apertures respectively communicating with upstream and downstream portions of said discharge flow path, said second needle port being smaller than the first needle port.

11. An implantable medication infusion pump, comprising:

a pump housing;

a reservoir within said pump housing for receiving and storing a supply of a selected medication;

pump means within said pump housing and defining a pump outlet port, said pump means being for delivering the medication from said reservoir through the pump outlet port;

a refill port on said pump housing to permit transcutaneous access to said reservoir;

a side port assembly mounted on said pump housing and defining a discharge flow path in flow communication with said pump outlet port, an access port to permit transcutaneous needle access to said discharge flow path, and check valve means for preventing fluid backflow within said discharge flow path; and

a catheter connected to said discharge flow path, whereby medication delivered through said pump outlet port passes through said discharge flow path and said catheter to a selected administration site within the body of a patient, said check valve being located along said discharge flow path between said access port and said catheter.

12. The implantable medication infusion pump of claim 11 wherein said access port comprises a port shield defining a generally conical depression with a first needle port formed centrally therein, a needle retainer defining a second needle port disposed in alignment with said first needle port, and a resilient self-sealing septum interposed between said port shield and said needle retainer.

13. The implantable medication infusion pump of claim 12 wherein said access port further defines a well formed along said discharge flow path, said needle retainer defining a generally concave conical wall having an apex end with said second needle port formed centrally at the apex end thereof, and a plurality of flow apertures formed in said conical wall, said needle retainer being mounted within said well formed along said discharge flow path, with said second needle port and said flow apertures respectively communicating with upstream and downstream portions of said discharge flow path, said second needle port being smaller than the first needle port.

14. The implantable medication infusion pump of claim 11 further including a strain relief fitting for mounting said catheter to said side port assembly and having a converging wall segment formed along a passage through said strain relief fitting, said catheter comprising a resilient lumen having a rigid sleeve fitted into an upstream end thereof, said upstream end of said lumen with said sleeve therein being drawn tightly against a converging wall segment formed along a passage through said strain relief fitting.

15. An implantable medication infusion pump, comprising:

a pump housing;

a reservoir within said pump housing for receiving and storing a supply of a selected medication;

pump means within said pump housing and including a discharge tube projecting outwardly from said pump housing and defining an outlet port, said pump means being for delivering the medication from said reservoir through said pump outlet port defined by the discharge tube;

a mounting lug projecting outwardly from said pump housing and having a flanged outboard end;

a side port assembly defining a discharge flow path and having a slide-fit fitting for engagement with said discharge tube to couple said outlet port with said discharge flow path, said side port assembly further defining a transversely open slot;

a lock clip receivable into the transversely open slot formed in said side port assembly to extend behind said flanged end of said mounting lug when said fitting is engaged with said discharge tube, and thereby retain said side port assembly on said pump housing;

said side port assembly further including an access port to permit transcutaneous needle access to said discharge flow path, and check valve means for preventing fluid backflow within said discharge flow path; and

a catheter connected to said discharge flow path, whereby medication delivered through said pump outlet port passes through said discharge flow path and said catheter to a selected administration site within the body of a patient.

16. The implantable medication infusion pump of claim 15 wherein said check valve means is located along said discharge flow path between said access port and said catheter.

17. The implantable medication infusion pump of claim 16 including spring-loaded means for retaining said lock clip within said slot.

18. The implantable medication infusion pump of claim 15 wherein said mounting lug has a cylindrical shape with said discharge tube disposed within said mounting lug.