Medical infusion pump with sensors

Details Medical infusion pump with sensors Medical infusion pump with sensors

1988-04-06

1989-08-15

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Combined

73722, 73728, 128DIG13, 338 32H, G01L 708, G01L 914

Patent

active

048563390

ABSTRACT:
A medical infusion pump includes a housing (10), a pump assembly (30), a bubble sensor assembly (120), a pressure sensor assembly (140) and a flow control assembly (180). The pump assembly includes a ring (26) with teeth (44) and a wheel (46) mounted for eccentric rotation within the ring. The pumping action is developed by the rotation of the wheel which continuously closes a portion of tubing (36) against one or two teeth as it goes through the pumping cycle. The bubble sensor includes a pair of sensor blocks (124) defining a generally V-shaped trough for cradling a portion of the tubing. The pressure sensor assembly detects pressure variations by movement of a diaphragm (168) coupled to a magnet (162) which is operatively coupled to a Hall effect circuit (160). The flow control assembly includes a thumb wheel (196) having a cam groove (197) interacting with a valve stem (199) for controlling the fluid flow through an orifice and associated valve seat (194).

REFERENCES:
patent: 3912168 (1975-10-01), Mullins et al.
patent: 4452599 (1984-06-01), Albisser et al.
patent: 4758228 (1988-07-01), Williams

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