JP-2026075855-A - Syringe for automatic injection device

JP2026075855AJP 2026075855 AJP2026075855 AJP 2026075855AJP-2026075855-A

Abstract

[Problem] To ensure the pressure-receiving area of the flange with simple operation when attaching it to an automatic injection device. [Solution] The syringe for an automatic injection device of the present invention is a syringe for an automatic injection device that has a flange on the syringe barrel that is inserted into a receiving portion provided on either the automatic injection device or a holder attached to the automatic injection device, wherein the flange is located on the tip side of the syringe barrel in the direction of the central axis of the syringe barrel and has a flange surface that is pressed against the inner wall surface of the receiving portion when the automatic injection device is in operation, and has a pair of guide grooves provided at both ends of the flange surface in directions perpendicular to the central axis and the direction in which the flange is inserted into the receiving portion, into which each of a pair of protruding pins that protrude from the inner wall surface of the receiving portion is inserted when the flange is inserted into the receiving portion. [Selection Diagram] Figure 3

Inventors

唐澤幸司

Assignees

ＯＲＴメディカル株式会社

Dates

Publication Date: 20260511
Application Date: 20241023

Claims (2)

A syringe for an automatic injection device, wherein the syringe outer barrel is equipped with a flange that is inserted into a receiving portion provided on either the automatic injection device or a holder attached to the automatic injection device, The flange mentioned above is A flange surface located on the tip side of the syringe outer barrel in the direction of the central axis of the syringe outer barrel, and which is pressed against the inner wall surface of the receiving portion when the automatic injection device is in operation, A pair of guide grooves are provided at both ends of the flange surface in directions perpendicular to the central axis direction and the direction in which the flange is inserted into the receiving portion, and into which each of a pair of protruding pins that protrude from the inner wall surface of the receiving portion is inserted when the flange is inserted into the receiving portion, A syringe for an automatic injection device, characterized by having the following features.
A syringe for an automatic injection device, characterized in that the spacing between the pair of guide grooves narrows towards the tip side in the direction of insertion of the flange into the receiving portion.

Description

This invention relates to a syringe for use with an automatic injection device. In the medical field, automated injection devices are provided for injecting highly viscous liquids, such as contrast agents for X-ray CT scans and MRI (magnetic resonance imaging) scans, into a patient's body. Syringes are attached to these automated injection devices either directly or via a syringe holder. The automatic injection device works by pressing the plunger of a syringe attached to the device, thereby pushing the liquid filled inside the syringe out of the syringe's nozzle. During the operation of pressing the plunger, the syringe flange is pressed against the side wall of the flange receiving portion of the automatic injection device, or against the side wall of the flange receiving portion of the syringe holder attached to the automatic injection device. If the area of the syringe flange pressed against the side wall of the flange receiving portion (hereinafter referred to as the flange pressure receiving area) is small, there is a risk of the flange being damaged. As a method for ensuring the pressure-receiving area of the syringe flange, for example, a method has been devised in which a flange with a flange cut portion is inserted into the syringe holder groove with the flange cut portion vertical, and the syringe is rotated 90° around the direction of the syringe's central axis (see Patent Document 1). Furthermore, another method has been devised in which, when the flange inserted into the syringe holder groove of the flange is rotated 90° around the central axis of the syringe, a notch provided in the arc portion of the flange engages with a claw provided in the syringe holder (see Patent Document 2). Japanese Patent Publication No. 2020-036959Patent No. 5878115 This is a perspective view showing an example of how to use the syringe for the automatic injection device shown in this embodiment.This is a schematic perspective view showing one configuration of a syringe for an automatic injection device as shown in this embodiment.Figure 2 is a six-view drawing showing the configuration of the flange of the syringe shown.(a) is a diagram showing the top surface of the syringe holder, and (b) is a cross-sectional view taken along line A-A in (a).(a) is a cross-sectional view of the cylinder holder just before the flange is inserted, and (b) is a cross-sectional view of the cylinder holder with the flange attached.This is a cross-sectional view of a cylinder holder when the flange is inserted while rotated at a predetermined angle in the direction of the central axis of the cylinder outer cylinder.This diagram shows an overview of the external pressure test on a flange.(a) The shape of the flange used in Comparative Example 1, and (b) The shape of the flange used in Comparative Example 2. The following describes an example of a syringe for an automatic injection device, which is one embodiment of the present invention, with reference to the drawings. Hereafter, the syringe for the automatic injection device will be referred to simply as the syringe. The liquid, such as a contrast agent, filled into the syringe barrel 11 will be referred to as the liquid. As shown in Figure 1, the syringe 10 is attached to the syringe mounting section 101 of the automatic injection device 100, or to the syringe mounting section 121 of the automatic injection device 120 via the syringe holder 110. The syringe holder 110 is attached to the holder receiving section 122 provided on the syringe mounting section 121 of the automatic injection device 120. As shown in Figure 2, the syringe 10 comprises a syringe casing 11 and a plunger 12. The syringe casing 11 is a cylindrical member formed from, for example, a synthetic resin material. The syringe casing 11 has a nozzle 15 at one end in the direction of its central axis C1, and a flange 20 at the other end in the same direction. The nozzle 15 of the syringe casing 11 has a connector shape with a threaded portion formed on its inner surface, allowing connection to a connector portion provided at one end of a fluid delivery tube (not shown). The plunger 12 is inserted into the syringe barrel 11 from the other end of the syringe barrel 11. The plunger 12 can move along the central axis C1 of the syringe barrel 11, allowing it to be pushed into or withdrawn from the syringe barrel 11. For example, when the plunger 12 is pushed into the syringe barrel 11, the liquid filled in the syringe barrel 11 is delivered from the nozzle 15 of the syringe barrel 11 to a liquid delivery tube (not shown). Next, the shape of the flange 20 will be explained using Figure 3. Figure 3(a) is a front view of the flange, and Figure 3(b) is a rear view of the flange. Figure 3(c) is a top view of the flange, and Figure 3(d) is a bottom view of the flange. Figure 3(e) is a left side view of the flange, and Figure 3(f) is a right side view of the flange. Note that in Figures 3(a) and 3(c), the syringe barrel 11 is indica