Drip infusion rate control apparatus

• US 4,889,528 A
• Filed: 02/29/1988
• Issued: 12/26/1989
• Est. Priority Date: 02/27/1987
• Status: Expired due to Fees

• Current Assignee: Shimadzu Corporation, Tanekazu Nadai
• Original Assignee: Shimadzu Corporation, Tanekazu Nadai
• Inventors: Kawara, Toshio, Nadai, Tanekazu
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US07/162,059
• Time in Patent Office: 666 Days
• Field of Search: 604/50, 604/65
• US Class Current: 604/65
• CPC Class Codes: A61M 5/16895 by monitoring weight change, e.g. of infusion container

Abstract

A drip infusion rate control apparatus controlling the flow rate of a medical solution to be infused into a human or animal body by means of a drip infusion system. The apparatus includes a weight measuring means for measuring the weight of a medicine bottle containing a medical solution being infused into a human or animal body through an infusion tube led out from the medicine bottle, an existing flow rate data computing means for computing, by using at least time-dependently varying weight data outputted from the weight measuring means, an existing flow rate reflecting value which reflects an existing flow rate of the medical solution flowing in the infusion tube, an aiming value outputting means for outputting a set of reference flow rate data defining an aiming flow rate expected to the medical solution, a basic data inputting means for inputting a set of basic data necessary for the aiming value outputting means to output the set of reference flow rate data, a comparator for comparing the existing flow rate reflecting value with at least one of the reference flow rate data contained in the set of reference flow data, and outputting a flow rate control signal, and a flow rate regulating mechanism interposed midway of the infusion tube, the mechanism being operative according to the flow rate control signal outputted from the comparator.

Claims

1. A drip infusion rate control apparatus for controlling the flow rate of a medical solution to be infused into a human or animal body by means of a drip infusion system, said apparatus comprising:

a weight measuring means for measuring the weight of a medicine bottle containing a medical solution being infused into a human or animal body through an infusion tube led out from said medicine bottle;

an existing flow rate data computing means for computing, by using at least time-dependently varying weight data outputted from said weight measuring means, an existing flow rate reflecting value which reflects an existing flow rate of said medical solution flowing in said infusion tube;

an aiming value outputting means for outputting a set of reference flow rate data defining an aiming flow rate expected to said medical solution;

a basic data inputting means for inputting a set of basic data necessary for said aiming value outputting means to output said set of reference flow rate data;

a comparator for comparing said existing flow rate reflecting value with at least one of the reference flow rate data contained in said set of reference flow rate data, and outputting a flow rate control signal; and

a flow rate regulating mechanism interposed midway of said infusion tube, said mechanism being operative according to said flow rate control signal outputted from said comparator.

2. A drip infusion rate control apparatus defined in claim 1, wherein said existing flow rate reflecting value is an existing flow rate itself of said medical solution flowing in said infusion tube;

said set of basic data consists of an aiming time period and an aiming total quantity of medical solution aimed to be infused in said aiming time period; and

said set of reference flow rate data consists only of a reference flow rate enabling an existing residual quantity of medical soltution to be infused completely at the end of said aiming time period; and

wherein said aiming value outputting means consists of a basic data memory and a flow rate computing means, said basic data memory being for storing and outputting said aiming time period and said aiming total quantity of medical solution aimed to be infused in said aiming time period, and said flow rate computing means computing said reference flow rate from said aiming time period and said time-dependently varying weight data outputted from said weight measuring means.

3. A drip infusion rate control apparatus defined in claim 2, wherein said aiming total quantity is an aiming total weight.

4. A drip infusion rate control apparatus defined in claim 1, wherein said existing flow rate reflecting value is an estimated total infusion quantity expected at the end of an aiming time period;

said set of basic data consists of said aiming time and an aiming total quantity of medical solution aimed to be infused in said aiming time period; and

said set of reference flow rate data consists only of said aiming total quantity of medical solution aimed to be infused in said aiming time period, and wherein said existing flow rate data computing means computes, using said aiming time period and said time-dependently varying weight data outputted from said weight measuring means, said estimated total infusion quantity;

said aiming value outputting means is a basic data memory for storing and outputting said aiming time period and said aiming total quantity of medical solution aimed to be infused in said aiming

5. A drip infusion rate control apparatus defined in claim 4, wherein said estimated total infusion quantity is an estimated total infusion weight expected at the end of said aiming time period;

and said aiming total quantity is an aiming total weight of medical solution aimed to be infused in said aiming time period.

6. A drip infusion rate control apparatus defined in any one of claim 1 and 2 to 5, wherein said flow rate data computing means is devised so that said existing flow rate reflecting value may be kept constant through a manual switchin operation for the purpose of keeping the infusion rate of said medical solution constant.

7. A drip infusion rate control apparatus defined in any one of claim 1 and 2 to 5, wherein an infusion stopping means is provided, said means being devised so as to rais an alarm and stop the infusion when the flow rate of said medical solution flowing in said infusion tube deviates from a predetermined allowable range.

8. A drip infusion rate control apparatus for controlling the flow rate of a medical solution to be infused into a human or animal body by means of a drip infusion system, said apparatus comprising:

a weight measuring means for repetitively measuring the weight of a medicine bottle containing a medical solution being infused into said human or animal body through an infusion tube led out from said medicine bottle at predetermined time increments;

an existing flow rate data computing means for computing, by using at least time-dependently varying weight data outputted from said weight measuring means, an existing flow rate reflecting value which reflects an existing flow rate of said medical solution flowing in said infusion tube;

a basic data inputting means for inputting a set of basic data necessary for an aiming value, said basic data comprising a total weight to be infused and a total time for infusion;

an aiming value outputting means for computing and outputting a set of reference flow rate data defining an aiming flow rate for said medical solution based upon said timedependently varying weight data, total weight to be infused and an amount of time remaining of said total time;

a comparator for comparing said existing flow rate reflecting value with at least one of the reference flow rate data contained in said set of reference flow rate data, and outputting a flow rate control signal; and

a flow rate regulating mechanism interposed midway of said infusion tube, said mechanism being operative according to said flow rate control signal output from said comparator;

whereby said flow rate is repetitively adjusted such that said total amount to be infused in infused in said total time.