Infusion pump apparatus

• US 3,901,231 A
• Filed: 02/07/1974
• Issued: 08/26/1975
• Est. Priority Date: 02/07/1974
• Status: Expired due to Term

• Current Assignee: Raymond G. Olson
• Original Assignee: Raymond G. Olson
• Inventors: Olson, Raymond G.
• Primary Examiner(s): Gaudet, Richard A.
• Assistant Examiner(s): Layton, Henry S.
• Application Number:
  US05/440,410
• Time in Patent Office: 565 Days
• Field of Search: 128/214E,214F,218A,218R,218G,DIG.1,DIG.12,DIG.13 74/40,48 92/13.7
• US Class Current: 604/152
• CPC Class Codes: A61M 5/14216 Reciprocating piston type
• CPC Class Codes: Y10S 128/01 Motorized syringe
• CPC Class Codes: Y10S 128/12 Pressure infusion
• CPC Class Codes: Y10S 128/13 Infusion monitoring

Abstract

Infusion pump apparatus for delivering intravenous fluid from a syringe to a patient so that volume may be accurately controlled between a small delivery rate and a large delivery rate is disclosed. The pump is adaptable to adjust the amplitude of the syringe stroke in order to accurately meter the volume of fluid delivered to a patient within a given time period. The pump may be employed in an oxygen atmosphere without creating a potentially dangerous condition likely to result in an explosion. An an optional feature a pressure sensitive arrangement which stops the pump in the event the resistance to flow of fluid becomes greater than that required for normal operation is also disclosed.

Claims

1. Infusion pump apparatus with an adjustable piston stroke amplitude for reciprocating a piston within a syringe to deliver fluid comprising:

a housing;

angulation means pivotally disposed in said housing and operatively connected to said piston to cause said reciprocation of said piston in said syringe;

arcuate means pivotally disposed in said housing operatively connected to said angulation means;

said arcuate means adaptable to adjustably determine said piston stroke amplitude by varying the displacement of said angulation means;

motor means connnected to said arcuate means operable to reciprocate said angulation means through said angular displacement; and

calibration means cooperable with said operative connection between said angulation means and said arcuate means, said calibration means comprising (a) means for pre-selecting the fluid flow rate of said infusion pump apparatus by adjusting said displacement of said angulation means, and (b) adjusting means for establishing the minimum and maximum displacement of said angulation means.

2. The infusion pump apparatus of claim 1 wherein said adjusting means comprises a plurality of threadably adjustable screws.

3. The infusion pump apparatus of claim 1 wherein said angulation means comprises lever means having one end pivotally secured within said housing, said arcuate means comprising a substantially U-shaped member having a middle portion shaped to form a portion of an arc and having grooves formed in said middle portion to define a curvilinear path, link means connected between a point substantially intermediate the ends of said lever means and a point adjustably positioned along said curvilinear path of said U-shaped member, said point of position of said link means along the curvilinear path of said U-shaped member being effective to control the angular distance traveled by said lever and thereby control the amplitude of the syringe piston.

4. The infusion pump apparatus of claim 1 wherein said motor means comprises a brushless synchronous electric motor, and magnetic switch means for controllinG said motor means between on and off positions, said motor means and said magnetic switch means being adaptable to operate safely in an explosive atmosphere when said switch controls said motor in an operable condition or causes said motor to turn on or off.

5. The infusion pump apparatus of claim 3 wherein said motor means comrises a synchronous motor adaptable to operate safely in an explosive atmosphere, an eccentric member keyed to a shaft rotatable by said motor, and a pivot link having one end pivotally connected to said eccentric member and another end pivotally connected to the point of position between said arcuate means and said link means located on the curvilinear path of said U-shaped member.