Spring-operated liquid-dispensing device

• US 4,557,728 A
• Filed: 04/16/1984
• Issued: 12/10/1985
• Est. Priority Date: 05/21/1982
• Status: Expired due to Fees

• Current Assignee: Repro-Med Systems Incorporated
• Original Assignee: Repro-Med Systems Incorporated
• Inventors: Yurdin, Carl, Sealfon, Andrew
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/600,840
• Time in Patent Office: 603 Days
• Field of Search: 604/134, 604/131, 604/214, 128/DIG. 12, 222/95, 222/103
• US Class Current: 604/134
• CPC Class Codes: A61M 5/148 flexible, e.g. independent bagsA61M5/155 takes precedence

Abstract

Involved is a device, noteworthy by its compact construction, portability and use of a cooperating pair of constant torque springs to dispense liquid under a uniform force, in which any binding in the slide that is urged through movement by the torque springs is obviated, so that the slide tracks properly during liquid-dispensing service of the device.

Claims

1. A spring-operated device for dispensing a liquid for achieving a medical or similar objective, said device comprising a rectangular-shaped housing bounding an internal compartment having a top cover disposed in covering relation over said compartment, said cover having a centrally located slot oriented longitudinally thereof opening into said compartment, a source of liquid in a collapsible bag disposed in said compartment, a slide member disposed in said compartment in pushing contact against said liquid-filled bag, a pair of constant torque springs of the type adapted to assume the form of helical coils disposed along opposite sides of said compartment and each operatively connected at one end to said slide member and at said opposite end to an end of said housing so as to urge said slide member through sliding movement through said compartment in response to said assumption of said helical coils at said end connected to said slide member, an upstanding leg on said slide member in projected relation into said slot of said cover so as to be adapted to track along said slot during said sliding movement of said slide member, a tracking member disposed for tracking movement in said slot of said cover attached to said projecting end of said upstanding leg of said slide member, and a clip means connected to said housing for selectively engaging said tracking member preparatory to commencing the liquid-dispensing service of said device.

2. A spring-operated liquid-dispensing device as claimed in claim 1 wherein a detachable connection is established between the contacting surfaces of the liquid-filled bag and said slide member, to thereby provide an option of replacing or reusing said bag in subsequent use of said device.