Richard K Bloom

US Patent:

50007408, Mar 19, 1991

Filed:

Apr 10, 1989

Appl. No.:

7/335472

Inventors:

Leonard C. Ducharme - Tampa FL
Joseph J. Chang - Tampa FL
Richard M. Bloom - Palm Harbor FL

Assignee:

Critikon, Inc. - Tampa FL

International Classification:

A61M 532

US Classification:

604162

Abstract:

A catheter device is described with a safety needle guard that covers and protects the needle after use of the device. The device includes a semi-tubular needle housing containing a flash chamber with a hollow needle extending from the distal end of the flash chamber. A tubular needle guard concentrically fits and slides within the needle housing. The needle guard has a longitudinal slot through which the mounting base of the flash chamber passes as the guard slides within the housing. The top of the semi-tubular housing is open so that a user may access the top of the tubular needle guard with a finger to urge the needle guard to an extended position from the distal end of the housing and in a surrounding position about the needle. As the needle guard attains its fully extended position about the needle, it locks in place in the needle housing.

US Patent:

47845767, Nov 15, 1988

Filed:

Mar 13, 1987

Appl. No.:

7/025681

Inventors:

Richard M. Bloom - Seminole FL
Carl Ritson - San Jose CA
Hal C. Danby - Sudbury, GB2

Assignee:

Critikon, Inc. - San Jose CA

International Classification:

F01B 2526
F01B 3112
F04B 2100

US Classification:

417 63

Abstract:

A back pressure sensor for a positive displacement pump comprises at least one flexible beam having a pivot end and a drive connector end, and a pump actuator mounted between the pivot end and the drive connector end. The pump actuator connects with a positive displacement member of a pump. At least one sensor beam is connected to the flexible beam at a mounting position between the distal end and vibration damping end thereof. A first capacitor plate is mounted on the flexible beam at a position adjacent to the pivot end thereof, and a second capacitor plate is mounted adjacent the distal end of the sensor beam in a position facing the first capacitor plate at a distance which permits a capacitance coupling between the capacitor plates. A vibration damping mass is secured to the vibration damping end of the sensor beam for damping drive motion vibrations in the sensor beam.