John E Slate

US Patent:

49195964, Apr 24, 1990

Filed:

Apr 26, 1989

Appl. No.:

7/344494

Inventors:

John B. Slate - Studio City CA
James L. Henke - Simi Valley CA

Assignee:

Pacesetter Infusion, Ltd. - Sylmar CA

International Classification:

F04B 2306

US Classification:

417 18

Abstract:

A fluid delivery monitoring and control apparatus for use in a medication infusion system is designed for use with a disposable fluid pathway that incorporates a sterile cassette containing pumping elements and sensor interfaces. The apparatus comprises a multi-segment drive mechanism, controller, and monitoring system. Fluid pumping is accomplished by controlling DC motors in the drive mechanism, each of which is coupled to two valves and a reciprocating piston for an individual pumping channel in the cassette. The motor is geared down to provide an appropriate maximum speed and torque. A cam sequentially actuates an inlet valve, piston, and an outlet valve in the cassette. A range of fluid delivery rates is achieved by periodically sending pulses to the motor. The output flow rate of the pump is maintained by a digital feedback controller which uses closed-loop feedback control to provide accurate regulation. At regular time intervals, the controller computes the motor voltage pulse width based upon feedback information from an encoder.

US Patent:

48634255, Sep 5, 1989

Filed:

Dec 4, 1987

Appl. No.:

7/129013

Inventors:

John B. Slate - Studio City CA
James L. Henke - Simi Valley CA

Assignee:

Pacesetter Infusion, Ltd. - Sylmar CA

International Classification:

A61M 3100

US Classification:

604 65

Abstract:

A system for detecting an occlusion in a fluid line is disclosed which can detect occlusions in the downstream or patient side of a disposable cassette containing a fluid pump thereon. The cassette includes a pressure diaphragm and is for installation onto and use with a main pump unit including a pressure transducer therein for monitoring fluid pressure downstream of the pump. The system utilizes control circuitry to provide an alarm in the event of a patient-side occlusion, and the occlusion detection system works when the system is configured as any of a number of difference device types, including both a flow controller emulation and several different infusion pump configurations.

US Patent:

50537474, Oct 1, 1991

Filed:

Sep 5, 1989

Appl. No.:

7/403259

Inventors:

John B. Slate - Studio City CA
James L. Henke - Simi Valley CA

Assignee:

Pacesetter Infusion, Inc. - Sylmar CA

International Classification:

G08B 2900
A61B 800

US Classification:

340507

Abstract:

An ultrasonic air-in-line detection system for use in detecting air bubbles in the fluid line of a disposable cassette mounted on a main pump unit is disclosed in which a self-test procedure is periodically used to ensure that any faults in the ultrasonic air-in-line detector which do not fail safe are automatically detected. After a pumping cycle is completed, if the ultrasonic air-in-line detector indicates that there is fluid in the fluid line at the location of the ultrasonic sensor, the operating frequency of the transmitting ultrasonic transducer is changed to a non-resonant frequency for the self-test procedure. If the ultrasonic air-in-line detector still produces a signal indicating that there is fluid in the line, this indicates that there is a failure in the ultrasonic detector and a fault is indicated and the system is shut down.

US Patent:

49502352, Aug 21, 1990

Filed:

May 10, 1988

Appl. No.:

7/192280

Inventors:

John B. Slate - Studio City CA
James L. Henke - Simi Valley CA
Son H. Hong - El Monte CA

Assignee:

Pacesetter Infusion, Ltd. - Sylmar CA

International Classification:

A61M 3100

US Classification:

604 65

Abstract:

A system for detecting an occlusion in a fluid line is disclosed which can detect occlusions in the upstream or container side of a disposable cassette containing a fluid pump therein. The cassette includes a piston-type pump with inlet and outlet valves, and is for installation onto and use with a main pump unit including motors for driving the pump and valves contained in each cassette. The system utilizes control circuitry to monitor the intake stroke of the pump in the cassette, to detect an upstream occlusion in the fluid line leading to the pump, and to provide an alarm in the event of a container-side occlusion.

US Patent:

47919310, Dec 20, 1988

Filed:

Aug 13, 1987

Appl. No.:

7/085421

Inventors:

John B. Slate - Los Angeles CA

Assignee:

Pacesetter Infusion, Ltd. - Sylmar CA

International Classification:

A61N 136

US Classification:

128419PG

Abstract:

A device for use in conjunction with a pulse generator is disclosed which provides a variable pulsing rate in response to short term variations in arterial blood pressure, like the baroreceptor system of the healthy body's cardiovascular system. The system utilizes a pressure transducer implanted together with the pacemaker, the transducer is preferably located on the proximal axillary artery. The system features quick response based on physiological need, and also includes a reset feature which maintains a normal resting heart rate despite long term changes in blood pressure.