Linear peristaltic pump with reshaping fingers intedigitated with pumping elements

• US 5,888,052 A
• Filed: 08/26/1997
• Issued: 03/30/1999
• Est. Priority Date: 12/06/1994
• Status: Expired due to Term

• Current Assignee: B Braun Medical Incorporated (B. Braun Holding GmbH & Co. KG)
• Original Assignee: Mcgraw Incorporated
• Inventors: Hill, Roger J.
• Primary Examiner(s): Thorpe, Timothy S.
• Assistant Examiner(s): Ratcliffe, Paul L.
• Application Number:
  US08/920,061
• Time in Patent Office: 581 Days
• Field of Search: 417/53, 417/474, 417/478, 417/479, 604/153
• US Class Current: 417/53
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

Abstract

A linear peristaltic pump of the type for removable engagement of a portion of a flexible tubing and having a plurality of sequentially actuated pumping elements which act along the engaged portion of the flexible tubing, with the pumping elements reciprocated in a first direction to collapse adjacent segments of the tubing and then in a second direction to release the adjacent segments of the tubing, each pumping element reciprocated in a sequence so that fluid in the flexible tubing is moved along the engaged portion of the tubing. The linear peristaltic pump further comprises a plurality of opposed pairs of pivotable reshaping fingers, with each pair of the reshaping fingers interposed adjacent to one of the pumping elements in sequence along the engaged portion of the flexible tubing. A finger drive and follower mechanism is formed by and engaged between each of the plurality of pairs of reshaping fingers and the adjacent ones of the pumping elements for actuating the reshaping fingers into reshaping engagement with the flexible tubing upon release thereof by the adjacent one of the pumping elements.

Claims

1. A linear peristaltic pump for moving fluid through a flexible tube comprising:

(a) a housing;

(b) a tube receiving channel;

(c) a closable door pivot by attached to said housing to hold said tubing into said tube receiving channel;

(d) a plurality of pumping plates each slidably held in said housing for contacting said flexible tube and each pumping plate positioned at a spaced apart interval from another pumping plate, for contacting said tubing;

(e) a plurality of cams on a rotary shaft engraved with said pumping plates for sequentially reciprocating said pumping plates to compress and release said flexible tube so that fluid is moved therethrough;

(f) a plurality of pairs of opposed reshaping fingers pivotably mounted in said housing, each pair of opposed reshaping fingers position in said spaced apart intervals between said pumping plates;

(g) actuator channels formed on said pumping plates for engaging said pairs of reshaping fingers and for sequentially moving said pairs out of and into reshaping contact with said flexible tube upon reciprocation of said pumping plates to compress and release said flexible tube, respectively.

2. A linear peristaltic pump for moving fluid through a flexible tube comprising:

(a) a housing having a tube receiving channel;

(b) a door having a backing surface, said door connected to said housing to be releasably engagable so that said backing surface is adjacent to said tube receiving channel;

(c) a plurality of pumping plates, each having a tube contacting surface and each one of said pumping plates movably mounted in said housing adjacent to another one of said pumping plates forming a plurality of spaces there between;

(d) a plurality of cams mounted on a single rotary drive shaft for sequentially moving said pumping plates into and out of said tube receiving channel;

(e) a plurality of pairs of opposed reshaping fingers pivotably mounted interposted in said plurality of spaces formed between said pumping plates;

(f) cam surfaces formed on each of said pumping plates slidingly engaged with said interposed pairs of reshaping fingers for pivoting said opposed reshaping fingers out of and partially into said tube receiving channels upon reciprocation of said pumping plates into and out of said tube receiving channel.