ADMINISTRATION APPARATUS FOR MEDICAL USE

• US 20090062777A1
• Filed: 10/10/2008
• Published: 03/05/2009
• Est. Priority Date: 03/05/2004
• Status: Active Grant

• Current Assignee: PHC Holdings Corporation
• Original Assignee: Panasonic Healthcare Holdings Co., Ltd.
• Inventors: Sugimoto, Hirofumi, Iio, Toshiaki, Takeuchi, Yoshiki, Matsuda, Kouichi, Kikuchi, Seiji
• Granted Patent: US 9,149,582 B2
• Time in Patent Office: Days
• US Class Current: 604/890.100
• 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

1-19. -19. (canceled)

20. An administration apparatus for medical use which performs administration of a drug using an electric driving source, 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;

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

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

a dose holding circuit for holding doses of drug which have been administered in the past;

a dose comparison circuit for comparing the dose that is set by the dose setting circuit with the doses that are held in the dose holding circuit; and

a control circuit for performing control so as to suppress the operation of the piston rod when the result of comparison by the dose comparison circuit is equal to or larger than a predetermined value.

21. An administration apparatus for medical use as defined in claim 20 wherein

the dose holding circuit holds the dose of drug that has been administered most recently, and

the dose comparison circuit compares the dose that is set by the user with a dose that has most recently been administered.

22. An administration apparatus for medical use as defined in claim 20 wherein

the dose holding circuit holds the doses of drug of plural times of administrations performed in the past, and

the dose comparison circuit compares the dose that is set by the user with a dose that is obtained on the basis of the plural times of administrations performed in the past.

23. An administration apparatus for medical use as defined in claim 22 wherein

the dose obtained on the basis of the plural times of administrations performed in the past is an average of doses of the plural times of administrations in the past.

24. An administration apparatus for medical use as defined in claim 20 further including a notification unit for notifying the user that administration is not possible, when the result of comparison by the dose comparison circuit is equal to or larger than the predetermined value.

25. An administration apparatus for medical use as defined in claim 24 wherein

when the user permits administration of the dose of drug that is set by the user is permitted after notifying the user that administration is not possible using the notification unit, the control circuit cancels restriction on the operation of the piston rod.

26. An administration apparatus for medical use which performs administration of a drug using an electric driving source, 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 held in the drug cartridge to move the plunger;

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

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

a dose detection circuit for detecting an actual dose of drug using an electronic circuit; and

a comparison detection circuit for comparing the dose that is set by the dose setting circuit with the result of detection by the dose detection circuit to detect overdose or underdose of the drug.

27. An administration apparatus for medical use as defined in claim 26 wherein

the comparison detection circuit stops the piston rod when it detects overdose of the drug, thereby to stop administration.

28. An administration apparatus for medical use as defined in claim 26 wherein

the dose detection circuit detects the dose on the basis of the amount of movement of the piston rod.

29. An administration apparatus for medical use as defined in claim 26 wherein

the dose detection circuit detects the dose on the basis of the time when the piston rod moves at a constant speed.