Transfusion pump

• US 5,219,327 A
• Filed: 10/28/1991
• Issued: 06/15/1993
• Est. Priority Date: 10/31/1990
• Status: Expired due to Term

• Current Assignee: Marconi Electronic Systems Ltd. (Marconi Holdings Company Limited)
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Okada, Shigeru
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): JONES, MARYBETH O
• Application Number:
  US07/782,985
• Time in Patent Office: 596 Days
• Field of Search: 604/151, 604/153, 604/250, 604/34, 128/DIG. 12, 128/DIG. 13, 251/7, 251/9, 417/474
• US Class Current: 604/34
• CPC Class Codes: A61M 39/281 Automatic tube cut-off devices, e.g. squeezing tube on detection of air
• 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: Y10S 128/12 Pressure infusion

Abstract

A transfusion pump 10 is that 1 when the door 13 is opened to set the tube, the clamping member 53 is retained in engagement with the first unclamp retaining portion 61 by manual operation so as to be set at the unclamp position, 2 when the door 13 is closed after the tube has been set, the clamping member 53 is released from its engagement with the first unclamp retaining portion 61 by the first unclamp releasing portion 63, and retained in engagement with the second unclamp retaining portion 64 so as to be set at the unclamp position, and 3 when the door 13 is opened after its closing, the clamping member 53 loses its engagement with the second unclamp retaining portion 64 so as to be set at the clamp position.

Claims

1. A transfusion pump comprising:

a housing body;

a door pivotally mounted on said housing body, said door being pivotable between an open position and a closed position;

a tube pressing means provided in said housing body;

a plate-like receiving member mounted on said door which support a, said tube receiving an intermittent tube force from a tube pressing motion of said tube pressing means, when said door is moved to said closed position, thereby providing a pumping action;

a locking member in said housing body for keeping said door closed;

a tube clamp device that unclamps said tube when said door is open to enable an initial setting of said tube between said plate-like receiving member and said tube pressing means;

said tube clamp device maintaining said tube in an unclamped state when said door is closed after said tube has been initially set between said plate-like member and said tube pressing means;

said tube clamp device clamping said tube when said door is opened, after said door was closed after said initial setting of said tube;

said tube clamp device including;

a tube receiving member mounted in said housing body;

a clamping member movably positioned in said housing body, said clamping member being movable from a first position where said tube is unclamped to a second position where said tube is clamped, said clamping member when in said second position clamping said tube between said tube receiving member and said clamping member;

an urging member corrected to said clamping member for urging said clamping member toward said tube receiving member;

a first unclamped retaining portion mounted in said housing body which engages and retains said clamping member in said first position when said tube is not clamped, when said door is opened;

a first unclamped releasing portion mounted on said door, said first unclamped releasing portion colliding with a projecting portion of said clamping member on a side of said door that faces an interior portion of said housing body, when said door is closed, thereby releasing said clamping member from engagement with said first unclamped retaining portion;

a second unclamped retaining portion for engaging and retaining said clamping member, said second unclamped retaining portion being mounted on said door and colliding with said projecting portion of said clamping member on said side of said door, said clamping member being released from engagement with said first unclamped releasing portion by an operation of said first unclamped releasing portion when said door is closed, whereby said clamping member is retained in engagement with said second unclamped retaining portion so that said clamping member is retained in said first unclamped position when said tube is unclamped;

and wherein;

A. when said door is opened to enable said initial setting of said tube between said tube pressing means and said plate-like receiving member, said clamping member engages said first unclamped retaining portion by a manual operation of said clamping member so as to set said clamping member at said first position, thereby enabling a fluid to flow through said tube;

B. when said door is closed, after said tube has been initially set, said clamping member is released from engagement with said first unclamped retaining portion by said first unclamped releasing portion while said clamping member is retained in engagement with said second unclamped retaining portion so as to set said clamping member at said first position to enable said fluid to flow through said tube; and

C. when said door is opened, after having been closed after said tube has been initially set between said tube pressing means and said plate-like receiving member, said clamping member disengages from said second unclamped retaining portion and is set at said second position to thereby clamp said tube to prevent said fluid flow through said tube.

2. The transfusion pump according to claim 1, further comprising:

urging means for urging said clamping member in a direction such that said clamping member engages with said first unclamped retaining portion when said clamping member is moved from said second position in a direction toward said first position to unclamp said tube by a manual operation of said clamping member.