Importance

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Abstract

Apparatus is provided for assuring that fluid is introduced from a pump to a receiver, such as a patient, at a controlled and safe pressure. This arrangement includes conduit means, such as inlet and outlet lines, which extend from the pump to the receiver and which are included in a disposable unit. The disposable unit includes detent means cooperative with detent means in the pump to hold the disposable unit in releasable relationship with the pump. Resilient means such as diaphragm are disposed in the conduit means in the disposable unit. The resilient means expand or contract in accordance with the pressure of the fluid in the outlet line. Actuatable means such as an actuatable arm is disposed in the disposable unit and is captured in the conduit means and is positioned in abutting relationship with the diaphragm for movement with the diaphragm. When the pressure of the fluid in the output line reaches a particular value, the actuating arm becomes displaced through a particular distance to operate sensing means external to the disposable unit. The operation of the sensing means causes an output indicator to be energized. The particular pressure for operating the sensing means is dependent upon the adjustable positioning of control means, such as a knob, external to the disposable unit. The manual adjustment of the knob causes a control member to be adjusted in position. The adjustment in the position of the control member may produce a corresponding adjustment in the force required to actuate the arm, thereby producing an adjustment in the fluid pressure at which the sensing means becomes operative.

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First Claim