Infusion rate adjusting device for drug solution injector
First Claim
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1. An infusion rate adjusting device for drug solution injectors used for injecting a drug solution, comprising a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution.
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Abstract
An infusion rate adjusting device for drug solution injectors comprises a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution. The infusion rate adjusting device is simple in operation to set out an infusion rate of the drug solution and is considerably reduced in the production cost.
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5 Claims
- 1. An infusion rate adjusting device for drug solution injectors used for injecting a drug solution, comprising a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution.
- 4. An infusion rate adjusting device for drug solution injectors used for injecting a drug solution, comprising a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution, wherein said tubular flow control unit includes plural check valves of a duck bill type, said check valves being arranged in series and in descending order of opening pressures from the upstream side to the downstream side, and wherein said check valve selecting means includes a tubular rod capable of being inserted into said check valve through a lumen of the flow control unit from an upstream side thereof to adjust the injection rate of the drug solution, the injection rate of the drug solution being determined by the check valve which is not yet opened by the rod and is present in the most upstream side of the lumen.
Specification