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Plunger for syringe, manufacturing method thereof, and medical syringe

A manufacturing method and a technology for a syringe, applied in the directions of hypodermic injection instruments, etc., can solve the problems of detachment of the main body of the piston, siphon phenomenon, and flow of medicinal liquid to the patient, etc., to prevent detachment, improve the degree of welding and become uneven, and the degree of welding uniform effect

Active Publication Date: 2021-07-23
NAIGAI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, when the medical syringe is filled with the medical solution, if the medical syringe is installed at a higher position than the patient, the medical solution will suddenly flow to the patient due to the pressure difference caused by the difference in height. Siphon phenomenon
Therefore, in general, the plunger body is fixed to a syringe pump device or the like to prevent the siphon phenomenon, but as described above, if the degree of welding at the contact surface between the piston body and the plunger body If it is uneven, even if the plunger body is fixed, the piston body will be separated from the parts of the plunger body, and as a result, there will be a problem of siphon phenomenon, causing the liquid medicine to flow rapidly to the patient.
In addition, when blood is returned in order to confirm that the patient is properly punctured, there is also a problem that the piston body is detached from the parts of the plunger body.

Method used

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  • Plunger for syringe, manufacturing method thereof, and medical syringe
  • Plunger for syringe, manufacturing method thereof, and medical syringe
  • Plunger for syringe, manufacturing method thereof, and medical syringe

Examples

Experimental program
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Effect test

Embodiment approach 1

[0046] [Medical Syringes]

[0047] As the medical syringe (hereinafter referred to as "syringe") of this embodiment, a prefilled syringe will be described below as an example. figure 1 is a cross-sectional view of the syringe. figure 2 It is a side view showing the syringe plunger (hereinafter referred to as "plunger") and the syringe outer cylinder (hereinafter referred to as "outer cylinder") of the syringe.

[0048] like figure 1 and figure 2 As shown, the syringe 10 of this embodiment includes: an outer cylinder 11 having a nozzle portion 12 at the front end; a cap 3 for sealing the nozzle portion 12; a plunger 21 having a gasket 23 at a connecting portion; The medicinal solution 6 in the chamber formed by the cap 3 and the gasket 23.

[0049] The outer cylinder 11 includes: a cylindrical portion 13 substantially formed in a cylindrical shape; a nozzle portion 12 provided at the front end of the cylindrical portion 13; and a finger grip 14 provided at the rear end of...

Embodiment approach 2

[0094] based on Figure 9 and Figure 10 , Embodiment 2 of the present invention will be described below. In addition, members having the same functions as those in Embodiment 1 are assigned the same reference numerals, and their descriptions are omitted. Figure 9 It is a sectional view showing the syringe plunger of the medical prefilled syringe according to the second embodiment. (a) of Fig. 10 is a side view showing the gasket and connecting portion of the syringe plunger, (b) of this figure is a sectional view showing the gasket and connecting portion, and (c) of this figure is a side view showing the gasket and connecting portion. Sectional view of the connection.

[0095] Regarding this Embodiment 2, if Figure 9 and Figure 10 As shown, the point that the gasket 23 is integrally provided by welding with the connection portion 61 is the same as that of the first embodiment. In addition, the plunger 21 and the connecting portion 61 have a connectable and detachable...

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Abstract

The invention provides a sealing gasket with a uniform degree of welding at the contact surface of the plunger body, and can prevent the separation of the two, the positional deviation of the gasket when the plunger body is installed on the gasket, and the deformation. A plunger for a syringe caused by shape deformation, a manufacturing method thereof, and a medical syringe. The plunger (21) for a syringe of the present invention comprises: a plunger main body (20); a connecting portion (24) provided at the front end of the plunger main body (20); The gasket (23) that accommodates at least a part of the connection portion (24) is provided with a recess (27) at the center of the front end surface of the connection portion (24), and the recess (27) is used to receive The molten resin receiving portion of the supplied molten resin for molding the gasket, the inner wall surface of the gasket (23) and the connection portion (24) are welded together at the contact surface including at least the concave portion (27).

Description

technical field [0001] The present invention relates to a plunger for a syringe, a method for producing the same, and a medical syringe. More specifically, it relates to a plunger for a syringe capable of preventing misalignment and shape deformation of a packing, a method for manufacturing the same, and a medical syringe. Background technique [0002] In recent years, prefilled syringes prefilled with medical solutions have been widely used. The sealing gasket in the prefilled syringe is inserted using a method called so-called vacuum capping. In this method, the outer cylinder with the front opening sealed is filled with a medical solution, and the atmosphere ( atmosphere under vacuum), the gasket is placed in the opening of the outer cylinder, and then the gasket is brought into a normal pressure state, thereby inserting the gasket into the outer cylinder. In addition, in prefilled syringes, the plunger may be mounted and assembled to the gasket after the sealing gasket ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/315B29C33/42B29C45/14B29C45/37
CPCA61M5/315B29C33/42B29C45/14B29C45/37
Inventor 铃木启介大浦知之
Owner NAIGAI KASEI KK
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