Negator spring-powered syringe

• US 5,261,882 A
• Filed: 04/26/1993
• Issued: 11/16/1993
• Est. Priority Date: 04/26/1993
• Status: Expired due to Term

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: Andrew I. Sealfon
• Inventors: Sealfon, Andrew I.
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US08/053,873
• Time in Patent Office: 204 Days
• Field of Search: 604/135, 604/134, 604/133, 604/132, 604/131, 604/151-154, 604/121, 604/246, 604/51, 604/218, 128/DIG. 12
• US Class Current: 604/135
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/1454 spring-actuated, e.g. by a clockwork
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: Y10S 128/12 Pressure infusion

Abstract

A negator spring-powered I.V. pump of compact size resulting from imparting a non-circular, rather than a linear configuration to the negator spring; the non-circular configuration taking up less size or linear dimension which, added to the linear dimension of the syringe of the pump, results in an optimum reduced overall pump size that is convenient for portable ambulatory I.V. therapy.

Claims

1. A negator spring-powered syringe having a compact sized non-linear compartment for said negator spring comprising a centrally disposed circular-shaped spindle having a peripheral surface for supporting movement therealong of a piston rod for said syringe, plural interconnected spheres serving as said piston rod disposed against said spindle support surface and extending therealong such that a distal positioned sphere is in a clearance position from said syringe and a proximal positioned sphere is in an adjacent position thereto, and a negator spring in an uncoiled configuration connected to extend from said proximal positioned sphere in encircling relation about said plural interconnected spheres into engaged relation with said distal positioned sphere, whereby during the coiling of said negator spring said connection to said distal positioned sphere urges said plural interconnected spheres in a circular path along said spindle support surface and into said syringe led by said proximal positioned sphere to thereby obviate the need of a linear oriented compartment for storing said interconnected spheres during non-use.

2. A negator spring-powered syringe as claimed in claim 1 wherein said circular-shaped spindle is V-shaped in cross section to facilitate the tracking of said interconnected spheres in the included angle of said V-shape.

3. A negator spring-powered syringe as claimed in claim 2 wherein said sphere encircling negator spring is in contact both against and also lengthwise of said interconnected spheres, whereby the urgency of said negator spring is in lengthwise relation to said interconnected spheres to urge said interconnected spheres through a power stroke and also in radial relation to said interconnected spheres to hold said interconnected spheres in said included angle of said V-shape of said spindle to maintain the proper tracking thereof.

4. A negator spring-powered syringe as claimed in claim 3 including a crank operatively connected to rotate said spindle in a direction opposite to the directional movement of the interconnected spheres under the urgency of said negator spring, whereby rotation of said crank is adapted to return said interconnected spheres to a starting position of movement preparatory to the power stroke thereof.