US 6,817,990 B2Granted

Fluid reservoir piston

AssigneeMedtronic MiniMed, Inc.

InventorsDarren Y. K. Yap, Poonam Gulati, Paul H. Kovelman, William P. Van Antwerp, Bradley J. Enegren, Eric P. Geismar, Philip J. Hudak, Susan McConnell, Sheldon B. Moberg

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Abstract

An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slide is removably coupled to the piston. The piston comprises a first member and a second member. The first member has an external proximate side and an external distal side. The external proximate side is adapted to contact the fluid and is made of a material having a first stiffness. The second member has a first side and a second side and is at least partially disposed within the first member. The first side of the second member is adjacent to the external proximate side of the first member and is made of a material having a stiffness which is greater than the first stiffness.

Claims39

Dependent claims

An apparatus for dispensing a medication fluid comprising:

a reservoir adapted to contain the fluid and adapted for use with a drive system having a threaded linear actuation member;
and
a piston comprising:
a first member adapted to be slidably mounted within the reservoir and adapted to form at least part of a fluid-tight barrier within the reservoir;
the first member having an external proximate side and an external distal side, the external proximate side being adapted to contact the fluid and being made of a material having a first stiffness, and wherein the external distal side forms an opening leading to a cavity and includes threads adapted to releasably engaged the threaded linear actuation member;
a second member having a first side and a second side, at least a portion of the second member being disposed within the cavity of the first member;
and
the first side of the second member being in the cavity and adjacent to the external proximate side of the first member and being made of a material having a stiffness which is greater than the first stiffness;
and
the second member further including one or more passages through the second member from the first side to the second side of the second member to permit admittance of a sterilization agent to the first side of the second member.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/940,369Filed 24 Aug 2001 · continuation in part
Priority: 29 Oct 1998
Published: US 2002/0077598 A120 Jun 2002
Granted: 16 Nov 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

A61M 5/162
Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor: needle sets, i.e. connections by puncture between reservoir and tube
A61M 5/1456
Pressurised by means of pistons: with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part…
A61M 5/14566
Pressurised by means of pistons: with a replaceable reservoir for receiving a piston rod of the pump
A61M 5/16831
Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters: monitoring, detecting, signalling or…

Family

Application60/106,237Us provisional application · filed 29 Oct 1998
Application09/429,352Parent of this continuation-in-part · filed 28 Oct 1999
Application09/698,783Parent of this continuation-in-part · filed 27 Oct 2000
US 2002/0077598 A1Pre-grant publication · published 20 Jun 2002
US 6,248,093 B1Parent of this continuation-in-part
US 6,800,071 B1Related patent
US 6,817,990 B2This patent

From the US filing history. Foreign family members aren’t listed.