Implantable patient-activated fluid delivery device with bolus injection port

• US 4,898,585 A
• Filed: 05/18/1988
• Issued: 02/06/1990
• Est. Priority Date: 05/18/1988
• Status: Expired due to Fees

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter Healthcare Corporation (Baxter International Inc.)
• Inventors: Jones, Michael L., Borsanyi, Alexander S.
• Primary Examiner(s): Rosenbaum, C. Fred
• Application Number:
  US07/195,769
• Time in Patent Office: 629 Days
• Field of Search: 604/8-10, 604/93, 604/116, 604/131, 604/151, 604/153, 604/175, 604/181-183, 604/185-186, 604/244, 604/249, 604/246, 604/247, 604/891.1, 604/31, 604/33, 137/843, 137/859
• US Class Current: 604/153
• CPC Class Codes: A61M 5/1428 with manual pumping action

Abstract

An implantable fluid delivery device for dispensing metered amounts of liquid medication when a pump assembly within its casing is operated by finger pressure applied to a central target zone of the casing'"'"'s top wall. The top wall also includes an injection site spaced from the central target zone for use when a bolus of medicament is to be injected into the device and delivered directly to the patient without passing through the pump assembly. The flattened pear shape of the casing and the location of the sites for pump activation and refilling on one hand, and for bolus injection on the other, facilitate errorfree use and operation of the device. Although limited fluid backup may occur during bolus injection, a valve arrangement within the device prevents intermixing of the bolus medicament with the liquid medication in the reservoir. In a second embodiment, a supporting grid prevents possible injury to the backup-restraining valve during bolus injection.

Claims

1. An implantable, finger-pressure-activated device for dispensing metered amounts of fluid to a patient, comprising a casing formed of soft deformable polymeric material having a top wall and a bottom wall defining a fluid reservoir with an outlet port;

pumping means within said casing comprising a compressible pump housing having a pumping chamber;

said casing including an enlarged body portion and a reduced lateral portion;

said top wall of said body portion having a central target zone for finger pressure activation of said pump when said target zone is depressed; and

said reduced lateral portion having a bolus injection chamber communicating with said outlet port;

said top wall of said reduced lateral portion having a bolus injection port adjacent said bolus injection chamber with said bolus injection port separated from said chamber by a needle-piercable self-sealing elastomeric membrane;

first passage-providing providing means being provided within said casing and defining an inlet passage extending from said reservoir to said pump chamber an annular valve seat at one end of said inlet passage facing said pump housing within said pump chamber;

an elastomeric inlet valve member mounted within said pump chamber and normally engaging said valve seat to close said inlet passage;

second passage-providing means defining an outlet passage extending from said pump chamber to said outlet port;

said bolus-receiving chamber communicating with said outlet passage;

whereby, medicament injected into said outlet passage through said bolus injection port is prevented from entering said inlet passage and said reservoir by said inlet valve member; and

a grid member being mounted in said inlet valve passage;

said grid member having a flow passages extending longitudinally therethrough and an end portion surrounded by said valve seat for engaging and bracing said elastomeric inlet valve member when back pressure develops in said pump chamber.

2. The device of claim 1 in which said inlet passage extends through a wall portion formed of elastomeric material;

said wall portion engaging and being supported upon a rigid support plate disposed within said casing; and

a rigid porous filter element secured to said support plate beneath said inlet passage;

said grid extending through said inlet passage and being supported by said filter element.