Administration apparatus for medical use

• US 9,149,582 B2
• Filed: 10/10/2008
• Issued: 10/06/2015
• Est. Priority Date: 03/05/2004
• Status: Active Grant

• Current Assignee: PHC Holdings Corporation
• Original Assignee: Panasonic Healthcare Holdings Co., Ltd.
• Inventors: Sugimoto, Hirofumi, Matsuda, Kouichi, Iio, Toshiaki, Kikuchi, Seiji, Takeuchi, Yoshiki
• Primary Examiner(s): GILBERT, ANDREW M
• Application Number:
  US12/249,282
• Publication Number:
  US 20090062777A1
• Time in Patent Office: 2,552 Days
• Field of Search: 604151-155, 604/890.1
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 2005/2073 preventing premature release, e.g. by making use of a safety lock
• CPC Class Codes: A61M 2005/208 Release is possible only when device is pushed against the skin, e.g. using a trigger which is blocked or inactive when the device is not pushed against the skin
• CPC Class Codes: A61M 2005/2411 from the front
• CPC Class Codes: A61M 2005/2496 via pivot
• CPC Class Codes: A61M 2005/3126 Specific display means related to dosing
• CPC Class Codes: A61M 2005/31518 designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
• CPC Class Codes: A61M 2005/31588 electrically driven
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/52 with memories providing a history of measured variating parameters of apparatus or patient
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• CPC Class Codes: A61M 5/3146 Priming, e.g. purging, reducing backlash or clearance
• CPC Class Codes: A61M 5/31535 Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
• CPC Class Codes: A61M 5/31541 Means preventing setting of a dose beyond the amount remaining in the cartridge
• CPC Class Codes: A61M 5/31546 Electrically operated dose setting, e.g. input via touch screen or plus/minus buttons

Abstract

An expansion/compression mechanism of a piston rod assembly is composed of a bush shaft, a first cylindrical piston rod that is screwed with the bush shaft, a second cylindrical piston rod that is screwed with the first piston rod, and a piston rod holding member for housing the bush shaft and these piston rods. Therefore, the piston rods move linearly in multiple stages.

Claims

1. An administration apparatus for medical use which performs administration of a drug, said apparatus comprising:

a drug cartridge having an end closed with a plunger, and containing a drug inside;

a cartridge holder for holding the drug cartridge;

a piston rod for pressing the plunger in the drug cartridge to move the plunger;

an injector motor which is connected to said piston rod, and drives said piston rod;

a motor driver for controlling operation of said injector motor;

a needle assembly for insertion of a needle into a target region and administering the drug emitted from the other end of the drug cartridge with movement of the piston rod;

a dose setting circuit for setting, by a user, a dose of drug to be administered as a set value;

a dose storing circuit storing a dose value range that is a range of dose amounts that is calculated from at least one dose amount that has been administered previously, and wherein the dose amount that has been administered previously is calculated on a basis of an amount of past movement of the piston rod driven by said injection motor;

a dose comparison circuit for comparing a new set value with the dose value range stored in the dose storing circuit when the new set value is newly set by the dose setting circuit;

a control circuit for performing control of the piston rod corresponding to a comparison result obtained by the dose comparison circuit, wherein the control circuit controls the motor driver to drive the piston rod when the new set value is within the dose value range, and wherein the control circuit suppresses the operation of the piston rod when the new set value is outside of the dose value range; and

a notification unit for informing the user that the set value is outside of the new dose value range when the new set value is outside of the dose value range;

wherein the dose value range is calculated based on a set percentage amount greater than and smaller than a certain dose value.

2. The administration apparatus of claim 1, wherein the certain dose value is an immediate past set value.

3. The administration apparatus of claim 1, wherein the certain dose value is an average value of past set values.