Transfusion device

• US 5,505,696 A
• Filed: 12/13/1993
• Issued: 04/09/1996
• Est. Priority Date: 12/14/1992
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Miki, Shigeichirou
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): MENDEZ, MANUEL A
• Application Number:
  US08/165,801
• Time in Patent Office: 848 Days
• Field of Search: 604/246, 604/65, 604/30, 604/31, 604/48, 604/50, 604/53, 604/66, 604/67, 604/246, 604/250-256, 128/DIG. 13
• US Class Current: 604/67
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626

Abstract

A transfusion device in which a transfusion tube is squeezed by a transfusion pump mechanism so as to feed transfusion solution in the transfusion tube through pressurization, comprising: a first member for setting size of air bubbles to be detected in the transfusion solution, which includes a bubble sensor; a second member for setting a transfusion rate and a transfusion quantity of the transfusion solution; a third member for calculating a pressurization feed rate of the transfusion solution on the basis of the transfusion rate and a cross-sectional area of the transfusion tube; a fourth member for calculating a permissible quantity of the air bubbles mixed into a unit volume of the transfusion solution on the basis of the size of the air bubbles and the transfusion rate; a fifth member for calculating an integrated value of the air bubbles per unit volume of the transfusion solution on the basis of the pressurization feed rate of the transfusion solution and output level of the bubble sensor; a sixth member for judging whether or not the integrated value of the air bubbles per unit volume of the transfusion solution exceeds the permissible quantity of the air bubbles mixed into the unit volume of the transfusion solution; and a seventh member for stopping, when the sixth member has formed an affirmative judgement, the transfusion pump mechanism.

Claims

1. A transfusion device in which a transfusion tube is squeezed by a transfusion pump mechanism so as to feed transfusion solution in the transfusion tube through pressurization, comprising:

first means operatively connected to the transfusion device for setting sizes of air bubbles to be detected in the transfusion solution, the first means including a bubble sensor formed by an ultrasonic transmitter and an ultrasonic receiver;

the ultrasonic transmitter and the ultrasonic receiver being located on an outer periphery of the transfusion tube so as to be opposed to each other through the transfusion tube;

said first means also for setting a transfusion rate and a transfusion quantity of the transfusion solution;

a second means responsive to said first means for calculating a pressurization feed rate of the transfusion solution on the basis of the transfusion rate and a cross-sectional area of the transfusion tube;

third means responsive to said first and second means for calculating a permissible quantity of the air bubbles mixed into a unit volume of the transfusion solution on the basis of the size of the air bubbles and the transfusion rate;

fourth means responsive to said third means for calculating an integrated value of the air bubbles per unit volume of the transfusion solution on the basis of the pressurization feed rate of the transfusion solution and output level of the bubble sensor;

fifth means responsive to said fourth means for judging whether or not the integrated value of the air bubbles per unit volume of the transfusion solution exceeds the permissible quantity of the air bubbles mixed into the unit volume of the transfusion solution; and

sixth means responsive to said fifth means for stopping, when the fifth means has judged that the integrated value of the air bubbles per unit volume of the transfusion solution exceeds the permissible quantity of the air bubbles mixed into the unit volume of the transfusion solution, the transfusion pump mechanism.

3. The transfusion device according to claim 1, wherein the first means include hand operable keys.

2. A transfusion device in which a transfusion tube is squeezed by a transfusion pump mechanism so as to feed transfusion solution in the transfusion tube through pressurization, comprising:

first means operatively connected to the transfusion device for setting sizes of air bubbles to be detected in the transfusion solution, the first means including a bubble sensor formed by an ultrasonic transmitter and an ultrasonic receiver;

the ultrasonic transmitter and the ultrasonic receiver being located on an outer periphery of the transfusion tube so as to be opposed to each other through the transfusion tube;

said first means also for setting a transfusion rate and a transfusion quantity of the transfusion solution;

second means responsive to said first means for calculating a pressurization feed rate of the transfusion solution on the basis of the transfusion rate and a cross-sectional area of the transfusion tube;

third means responsive to said first and second means for calculating a permissible quantity of the air bubbles mixed into the transfusion solution during a unit time period of the basis of the size of the air bubbles and the transfusion rate;

fourth means responsive to the third means for calculating an integrated value of the air bubbles at an interval of the unit time period on the basis of the pressurization feed rate of the transfusion solution and output level of the bubble sensor;

fifth means responsive to said fourth means for judging whether or not the integrated value of the air bubbles at the interval of the unit time period exceeds the permissible quantity of the air bubbles mixed into the transfusion solution during the unit time period; and

sixth means responsive to said fifth means for stopping, when the fifth means has judged that the integrated value of the air bubbles at the interval of the unit time period exceeds the permissible quantity of the air bubbles mixed into the transfusion solution during the unit time period, the transfusion pump mechanism.

4. The transfusion device according to claim 2, wherein the first means include hand operable keys.