PHARMACEUTICAL INJECTION DEVICE

• US 20140207058A1
• Filed: 08/06/2012
• Published: 07/24/2014
• Est. Priority Date: 09/12/2011
• Status: Active Grant

• Current Assignee: PHC Holdings Corporation
• Original Assignee: Panasonic Healthcare Company Limited (PHC Holdings Corporation)
• Inventors: Kikuchi, Seiji, Kondoh, Tsuguhiro, Hata, Shinsuke, Kawabata, Tatsuya
• Granted Patent: US 9,192,722 B2
• Time in Patent Office: Days
• US Class Current: 604/92
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 2205/215 Tilt detection, e.g. for warning or shut-off
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• 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 5/2066 comprising means for injection of two or more media, e.g. by mixing
• CPC Class Codes: A61M 5/2448 comprising means for injection of two or more media, e.g. by mixing
• CPC Class Codes: A61M 5/3146 Priming, e.g. purging, reducing backlash or clearance

Abstract

This pharmaceutical injection device comprises a main body case (2) having an injection needle extension/retraction opening (1); a pharmaceutical syringe mounting portion (3) provided inside the main body case (2); a piston (5) capable of moving relative to the pharmaceutical syringe mounting portion (3); a drive mechanism (6) for the piston (5); a controller (7) that is electrically connected to the drive mechanism (6); and an orientation sensor (8) that is electrically connected to the controller (7). The controller (7) controls the speed of the piston (5) in order to reduce liquid leakage during pharmaceutical mixing.

Claims

1. A pharmaceutical injection device, comprising:

a main body case having an opening from which an injection needle retractably protrudes;

a pharmaceutical syringe mounting portion that is provided within the main body case and to which a pharmaceutical syringe is removably mounted;

a piston that is provided movably with respect to the pharmaceutical syringe;

a drive mechanism that drives the piston;

a controller that is electrically connected to the drive mechanism; and

an orientation sensor that is electrically connected to the controller,

wherein the pharmaceutical syringe has a cylinder, a distal end gasket provided on the distal end side within the cylinder, a push-in gasket provided on the rear end side within the cylinder, a separation gasket provided in the middle within the cylinder, a solid pharmaceutical housed in the cylinder between the distal end gasket and the separation gasket, a liquid pharmaceutical housed in the cylinder between the push-in gasket and the separation gasket, and a bypass that sticks out in the outer peripheral direction of the cylinder at a portion of the cylinder between the distal end gasket and the separation gasket,

the controller uses the drive mechanism to push the push-in gasket to the distal end gasket side with the piston after detection of the orientation position by the orientation sensor, and

the rate at which the push-in gasket is pushed in by the piston is set so that if we let V1 be the push-in rate until the separation gasket reaches the bypass, V2 be the push-in rate at the point when the separation gasket goes through the bypass, V3 be the push-in rate at the point when air is vented after the separation gasket has gone through the bypass, and V4 be the push-in rate at the point when a pharmaceutical is injected after air venting, the push-in rate V2 will be lower than the push-in rate V1.

2. The pharmaceutical injection device according to claim 1,

wherein the orientation sensor is mounted on a substrate having the controller, and

the substrate is installed so as to be either parallel or perpendicular to the drive direction of the piston.

3. The pharmaceutical injection device according to claim 1,

wherein the controller stops the piston from moving to the opening side when the orientation sensor has detected inclination at or above a set value.

4. The pharmaceutical injection device according to a claim 1,

wherein the controller controls so that the push-in rate V3 will be lower than the push-in rate V1.

5. The pharmaceutical injection device according to claim 1,

wherein the controller controls so that the push-in rate V4 will be higher than the push-in rate V3.