Syringe assembly and infusion pump assembly incorporating such

• US 7,803,134 B2
• Filed: 01/10/2007
• Issued: 09/28/2010
• Est. Priority Date: 01/10/2007
• Status: Expired due to Fees

• Current Assignee: LifeScan IP Holdings, LLC
• Original Assignee: Animas Corporation (Johnson & Johnson)
• Inventors: Sharifi, Bahram, Lawson, William IV, Paul, Patrick
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): STOHR, LEAH C
• Application Number:
  US11/651,876
• Publication Number:
  US 20080167618A1
• Time in Patent Office: 1,357 Days
• Field of Search: 604131-157, 604187-240, 604/890, 604/891.1, 604/403, 604/43, 604/30, 604/93.01, 604/257, 128/DIG.1
• US Class Current: 604/155
• CPC Class Codes: A61M 2005/31516 reducing dead-space in the syringe barrel after delivery
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump

Abstract

A syringe assembly for use with an infusion pump having a drive piston. The syringe assembly comprises a substantially hollow syringe housing and a plunger axially movable within the syringe housing to dispense a fluid therefrom. The plunger has a body with a portion thereof configured to engage a radially elastic member associated with the drive piston such that the plunger is releasably axially secured relative to the drive piston.

Claims

1. An infusion pump assembly comprising:

an insulin pump including a drive piston having a radially elastic member associated therewith;

a syringe assembly including a substantially hollow syringe housing and a plunger axially movable within the syringe housing to expel a fluid therefrom, the plunger having a body with a portion configured to engage the radially elastic member associated with the drive piston such that the plunger is releasably axially secured relative to the drive piston; and

wherein the plunger body includes a first annular groove configured to receive a portion of the radially elastic member and the drive piston includes a second annular groove configured to receive a portion of the radially elastic member and at least a portion of the plunger body is configured to be received within a portion of the drive piston and the first annular groove is an exterior groove and the second annular groove is an internal groove.

2. The infusion pump assembly of claim 1 wherein the first and second annular grooves are axially aligned when the plunger is positioned in a final assembled position relative to the drive piston.

3. The infusion pump assembly of claim 1 wherein the first annular groove has opposed side walls which are angled relative to one another by approximately 90 to 175 degrees.

4. The infusion pump assembly of claim 1 wherein the interior annular groove has opposed side walls which are angled relative to one another by approximately 135 degrees.

5. The infusion pump assembly of claim 1 wherein the second annular groove is radially deeper than the first annular groove.

6. The infusion pump assembly of claim 1 wherein the radially elastic member is a canted coil spring.

7. The infusion pump assembly of claim 1 wherein the radially elastic member is a solid ring manufactured from an elastomeric material.