Thomas F Callaghan

US Patent:

53123344, May 17, 1994

Filed:

Jan 5, 1993

Appl. No.:

8/001112

Inventors:

Keita Hara - Kashihara, JP
Alan G. Bettisch - Buffalo Grove IL
Joseph B. Matthews - Grayslake IL
Thomas Callaghan - Algonquin IL

Assignee:

Sharp Kabushiki Kaisha - Osaka

International Classification:

A61M 3100

US Classification:

604 65

Abstract:

A peristaltic pumping apparatus has a misloaded-tube detector. The detector is constituted of a pair of pressure sensors and a CPU. The pressure sensors are located on both sides of a fluid propelling portion onto which an IV tube containing a solution is loaded. The detector detects a tube misloading by making use of pressure which is applied to one pressure sensor when the tube is displaced onto the pressure sensor and is forced against it by the closing of a door. Each sensor consists of first and second electrodes spaced from each other, a pressure-resistive conductive element attached to the first electrode and spaced from the second electrode and capable of connecting thereto, and a resistor connected to the first and second electrodes. The CPU judges from a resistance value of the pressure sensor as to whether the tube is properly loaded or misloaded or whether the pressure sensor is in an operative state.

US Patent:

53437349, Sep 6, 1994

Filed:

Sep 3, 1992

Appl. No.:

7/940342

Inventors:

Akihiro Maeda - Kyoto, JP
Thomas Callaghan - Algonquin IL

Assignee:

Sharp Kabushiki Kaisha - Osaka
Baxter Int'l Inc. - Deerfield IL

International Classification:

G01N 700

US Classification:

73 1901

Abstract:

A sampling method for sampling an output emerging from a bubble detector used in an infusion device of a type including an resilient infusion tubing, a peristaltic pump including a plurality of juxtaposed finger members for sequentially squeezing a portion of the infusion tubing while producing at least one moving zone of occlusion along the infusion tubing for infusing a medical solution intravenouly, a stepper motor for driving the peristaltic pump. The sampling of an output from the bubble detector is carried out only during a first period from the timing at which a most upstream member of the finger members squeezes that portion of the infusion tubing to the timing at which a most downstream member of the finger members closest to the destination subsequently squeezes that portion of the infusion tubing, but not during a second period from the timing at which the most downstream finger member squeezes that portion of the infusion tubing to the timing at which the most upstream finger member squeezes that portion of the infusion tubing.

US Patent:

53706129, Dec 6, 1994

Filed:

Apr 2, 1993

Appl. No.:

8/042004

Inventors:

Akihiro Maeda - Souraku, JP
Thomas Callaghan - Algonquin IL

Assignee:

Sharp Kabushiki Kaisha - Osaka
Baxter International Incorporated - Deerfield IL

International Classification:

A61M 3100

US Classification:

604 67

Abstract:

A slit disk having a hole at a specified portion of its flat surface and a plurality of slits at regular intervals at a peripheral portion thereof is mounted to a shaft of an infusion pump. A controller clears a live band determination counter based on a light detection signal from a sensor when the hole is detected, and increments the count value of a live band determination counter when an side edge of one of the plurality of slit is detected. When the count value of the live band determination counter falls within "10" to "24" or "0" to "2", it is determined that the infusion pump is in a live band, and the count value of the live band counter is incremented. Thus an operation amount of the infusion pump in the live band is detected to measure a fluid delivery rate taking a dead band into account.

US Patent:

53953215, Mar 7, 1995

Filed:

Apr 2, 1993

Appl. No.:

8/042005

Inventors:

Masafumi Kawahara - Nara, JP
Thomas Callaghan - Algonquin IL
Grace M. Esche - Algonquin IL
Cynthia A. Bennett - Park Ridge IL

Assignee:

Sharp Kabushiki Kaisha - Osaka
Baxter International Inc. - Deerfield IL

International Classification:

A61M 3100
A61M 100

US Classification:

604 67

Abstract:

In an infusion apparatus for use in the medical field, a peristaltic pump mechanism pumps an infusion fluid including medication through an administration tube toward a patient. A clock powered independent of the apparatus counts a predetermined unit time. A CPU accumulates data representing an incremental unit of fluid of the infusion fluid delivered by the pump mechanism to measure an accumulated infusion fluid volume each time the clock counts the unit time. Data as to the current accumulated infusion fluid volume is stored in a second storage section of a RAM. Each time the clock counts the unit time, data representing the accumulated infusion fluid volume stored in the second storage section is written to a ring buffer in the RAM, so that the ring buffer stores data representing a plurality of accumulated infusion fluid volumes in one-to-one correspondence with a plurality of times at which the plurality of accumulated infusion fluid volumes were measured. The CPU accesses the buffer ring at a key-inputted request by an operator to display any desired accumulated data of the infusion fluid volume on a display unit.