Injection set and flow meter for parenteral fluids

• US 3,101,710 A
• Filed: 06/08/1960
• Issued: 08/27/1963
• Est. Priority Date: 06/08/1960
• Status: Expired due to Term

• Current Assignee: Wilbur R. Koehn
• Original Assignee: Wilbur R. Koehn
• Inventors: Koehn, Wilbur R.
• Application Number:
  US04/034,725
• Time in Patent Office: 1,175 Days
• US Class Current: 604/254
• CPC Class Codes: A61M 5/16886 for measuring fluid flow rate, i.e. flowmeters
• CPC Class Codes: G01F 1/22 by variable-area meters , e.g. rotameters
• CPC Class Codes: G01F 1/28 by drag-force, e.g. vane type or impact flowmeter

Claims

1. AN INJECTION SET FOR PARENTERAL LIQUIDS COMPRISING IN COMBINATION, A CONTAINER FOR PARENTERAL LIQUIDS, A FLOAT TYPE FLOW METER, AN INJECTION NEEDLE, TUBES CONNECTING THE CONTAINER TO THE FLOW METER AND THE FLOW METER TO THE NEEDLE, MEANS FOR CONTROLLING THE FLOW TO THE NEEDLE TO MAINTAIN THE FLOW METER FILLED WITH LIQUID, SAID FLOW METER COMPRISING A CONTINUOUS WALL OF TRANSPARENT MATERIAL FORMING AN ANNULAR CHAMBER DIVERGING DOWNWARDLY FROM THE CONTAINER TOWARD THE NEEDLE, SAID TUBE FOR CONNECTING THE CONTAINER TO THE FLOW METER BEING DIRECTLY CONNECTED TO THE UPPER SMALL END OF THE DOWNWARDLY DIVERGING CHAMBER SO THAT PARENTERAL LIQUID FLOWS DOWNWARDLY THERETHROUGH A FLOAT IN SAID CHAMBER HAVING A SPECIFIC GRAVITY LESS THAN THE SPECIFIC GRAVITY OF THE LIQUID, SAID FLOAT BEING BUOYED UP BY A FORCE EQUAL TO THE DIFFERENCE IN THE WEIGHT OF THE FLOAT AND LIQUID DISPLACED AND OPPOSED BY THE DRAG FORCE OF THE SOLUTION FLOWING DOWNWARDLY THROUGH THE CHAMBER AND ACTING TO POSITION THE FLOAT IN EQUILBRIUM AT A POSITION CORRESPONDING TO A PARTICULAR RATE OF FLOW, AND A CALIBRATED SCALE IN FIXED RELATION TO THE WALL OF SAID CHAMBER TO ACCURATELY INDICATE THE RATE OF FLOW OF SOLUTION THERETHROUGH.