Liquid infusion device
AssigneeNissho Corporation
InventorsHajime Tsujikawa, Katsuhiro Hiejima
Life of this patent
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Abstract
A liquid infusion device comprising a bladder assembly, an approximately tubular housing, and a liquid-drug-dispensing portion. The bladder assembly comprises a rod-like inner shaft, a tubular outer shaft slidably encasing the inner shaft, an inner shaft supporter, and a bladder made of elastic material and placed outside two shafts. The housing contains the bladder assembly and has an inlet/outlet portion at an end of the housing. The inner shaft supporter has at least one port for liquid drug communicating with the inlet/outlet portion. An amount of liquid drug remaining in the bladder can be greatly reduced, since a clearance between the inner shaft and outer shaft can be made very small.
Claims6
A liquid infusion device comprising
- (a) a bladder assembly comprising a an inner shaft, a tubular outer shaft slidably encasing the inner shaft, an inner shaft supporter integrally formed with the inner shaft at one end of the inner shaft on the opposite side from the outer shaft side, and a bladder made of elastic material and placed outside the outer shaft and inner shaft wherein one end of the bladder is tightly fixed to the outer shaft and the other end of the bladder is tightly fixed to the inner shaft,
- (b) an approximately tubular housing containing the bladder assembly and having an inlet/outlet portion of liquid drug at an end of the housing,
- (c) a liquid-drug-dispensing portion connected to the inlet/outlet portion and having a flow-regulating portion for regulating a flow rate of liquid drug wherein the inner shaft supporter has at least one port for liquid drug communicating with the inlet/outlet portion.
Dependencies are inferred from the claim text.