| 主权项 |
1. An inflation device comprising:
a syringe body having proximal end and a distal end and a bore contained therein, the bore configured to hold a fluid therein; a plunger assembly comprising a shaft having a proximal end and a distal end, the proximal end of the shaft operatively coupled to an actuator, the distal end of the plunger assembly comprising a sealing member configured to form a fluid tight seal with the syringe body; a connector disposed at the distal end of the inflation device, the connector containing an aperture configured for passage of fluid, wherein the aperture is disposed along a longitudinal axis passing through the bore of the syringe body; and a shut-off valve disposed within a valve body, the valve body and shut-off valve coaxially contained within the bore of the syringe body, said shut-off valve in fluid communication with the syringe bore, the valve body including an aperture therein that communicates with an outlet channel formed between an external surface of the valve body and an inner surface of the syringe body that is fluidically connected to the aperture of the connector, the shut-off valve comprising a spring-biased moveable piston having a bypass lumen contained therein, wherein the bypass lumen forms a fluid path between the bore and the outlet channel when the pressure of the fluid is below a threshold value and wherein the fluid path between the bore and the outlet channel is interrupted when the pressure of the fluid is above the threshold value. |
