Syringe pump, and liquid feeding method

• US 20040073161A1
• Filed: 08/22/2003
• Published: 04/15/2004
• Est. Priority Date: 02/22/2001
• Status: Abandoned Application

• Current Assignee: Terumo Kabushiki Kaisha
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Tachibana, Yasuharu
• Application Number:
  US10/468,798
• Publication Number:
  US 20040073161A1
• Time in Patent Office: Days
• US Class Current: 604/67
• CPC Class Codes: A61M 2205/3379 Masses, volumes, levels of fluids in reservoirs, flow rates
• CPC Class Codes: A61M 2205/3393 by weighing the reservoir
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/1458 Means for capture of the plunger flange
• CPC Class Codes: A61M 5/1684 by detecting the amount of infusate remaining, e.g. signalling end of infusion
• CPC Class Codes: A61M 5/16854 by monitoring line pressure

Abstract

A syringe pump adapted to inject a liquid medicine in the syringe according to a predetermined infusion pattern, comprising a syringe diameter detecting means for detecting the volume of the syringe, an infusion pattern input means for inputting an infusion pattern, an occlusion pressure setting means, a pusher position calculating means, and a drive control means for drive-controlling a motor on the basis of an inputted infusion pattern to push the pusher of the syringe so as to infuse the liquid medicine in the syringe, and characterized in that the pusher position is calculated on the basis of the set-inputted infusion pattern and the occlusion detection level is automatically changed according to the pusher position.

Claims

1. A syringe pump which infuses a liquid medicine in a syringe according to a predetermined infusing pattern comprising:

a syringe diameter detection means which detects the capacity of the syringe,

a liquid infusing pattern input means which inputs a liquid feeding pattern,

an occlusion pressure setting means,

a pusher position calculating means and a drive control means which controls the driving of a motor on the basis of an input liquid infusing pattern and injects the liquid medicine in the syringe by pushing the pusher of the syringe;

characterized in that a pusher position is calculated on the basis of the set and input liquid feeding pattern and that an occlusion detection level is automatically changed according to said pusher position.

2. The syringe pump in accordance with claim 1, characterized in that said pusher position in which a remaining amount of liquid medicine in the syringe decreases is set as an alarm position, that said occlusion detection level is set at a low level, and that a push-finish position until said remaining amount is infused by the movement of the pusher from said alarm position by use of said drive control means is calculated from a relational expression of LE=LNE+VNE/A, in which VNE is the remaining amount, LNE is said alarm position, LE is said push-finish position and A is a cross-sectional area of the syringe.

3. The syringe pump in accordance with claim 1, characterized in that said pusher position in which a remaining amount of liquid medicine in the syringe decreases is set as an alarm position, that said occlusion detection level is set at a low level, and that a push-finish position until said remaining amount is infused by the movement of the pusher from said alarm position by use of said drive control means is calculated from a relational expression LE=LNE+R×

T/A, in which LNE is said alarm position, LE is said push-finish position, R is an infusion rate, T is remaining time and A is a cross-sectional area of the syringe.

4. A method of infusing a liquid medicine in a syringe according to a predetermined liquid infusing pattern, characterized in that the method of feeding a liquid medicine by use of a syringe pump comprising the first step of detecting the capacity of the syringe, the second step of inputting a liquid infusing pattern, the third step of controlling the driving of a motor on the basis of an input liquid infusing pattern and infusing the liquid medicine in the syringe by pushing the pusher of the syringe, and the fourth step of calculating a pusher position on the basis of the set and input liquid infusing pattern and automatically changing an occlusion detection level according to said pusher position.

5. The method of infusing a liquid medicine according to claim 4, characterized in that in said fourth step, said pusher position in which a remaining amount of liquid medicine in the syringe decreases is set as an alarm position, that said occlusion detection level is set at a low level, and that a push-finish position until said remaining amount is injected by the movement of the pusher from said alarm position by use of said drive control means is calculated from a relational expression LE=LNE+VNE/A, in which VNE is the remaining amount, LNE is said alarm position and LE is said push-finish position and A is a cross-sectional area of the syringe.

6. The method of infusing a liquid medicine according to claim 4, characterized in that in said fourth step, said pusher position in which a remaining amount of liquid medicine in the syringe decreases is set as an alarm position, that said occlusion detection level is set at a low level, and that a push-finish position until said remaining amount is infused by the movement of the pusher from said alarm position by use of said drive control means is calculated from a relational expression LE=LNE+R×

T/A, in which LNE is said alarm position, LE is said push-finish position, R is an infusion rate, T is remaining time and A is a cross-sectional sectional area of the syringe.