초록 ▼

Apparatus for fluid flow control in a parenteral administration system, utilizing a syringe pump operated by a motor to repetitively fill and empty a syringe cartridge over a plurality of operational cycles of successive fill stroke and pump stroke periods. The apparatus repetitively and sequentiall

Apparatus for fluid flow control in a parenteral administration system, utilizing a syringe pump operated by a motor to repetitively fill and empty a syringe cartridge over a plurality of operational cycles of successive fill stroke and pump stroke periods. The apparatus repetitively and sequentially opens and closes a pair of intake and output I.V. tubes communicating with a syringe, the tubes alternating opened and closed states, one tube always being open while the other is closed, by means of a pair of L-shaped pivotal tube pinchers, one pincher controlling each I.V. tube, each pincher being normally spring biased to the tube clamping shut-off state. The tube pinchers are alternately pivoted to a non-clamping, tube-open position by a spring biased, intermittent motion, reciprocating slide bar under the control of a reversible, rotating cam, the cam being driven by the same motor as that used to drive the piston of the syringe through its fill and pump strokes. A photoelectric sensor is responsive to the physical position of one of the tube pinchers and generates an electrical signal to control the direction of motor rotation and, hence, determines whether the syringe pump performs a fill stroke or a pump stroke.

대표청구항 ▼

In a syringe pump having a housing and intake and output I.V. tubes, the combination comprising: a pair of movable tube pinchers positioned adjacent the I.V. tubes to normally pinch off the tubes; drive means for alternately posItioning said tube pinchers to open and close said I.V. tubes in proper

In a syringe pump having a housing and intake and output I.V. tubes, the combination comprising: a pair of movable tube pinchers positioned adjacent the I.V. tubes to normally pinch off the tubes; drive means for alternately posItioning said tube pinchers to open and close said I.V. tubes in proper sequence for performance of fill and pump strokes by the syringe pump; cam means within the housing in the vicinity of said tube pinchers; and cam follower means consisting of a single member positioned by said cam means for controlling substantially simultaneouus snap action positioning of both of said tube pinchers so that said positioning maintains a one tube always open and one tube always closed relationship. Apparatus as set forth in claim 17, and further including: a reference light source and photoelectric sensor maintained in a fixed position; and an opaque member carried by one of said tube pinchers and adapted to interrupt the light beam from said reference light source in one position of the tube pincher while being withdrawn from said light beam in the other position of said tube pincher, whereby an electrical signal is generated indicating the required direction of rotation of said motor.