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Syringe plunger, method of manufacturing same, and medical syringe

A manufacturing method and technology of syringes, which are applied to hypodermic injection instruments and other directions, can solve the problems of piston body detachment, liquid medicine flowing to patients, siphon phenomenon, etc., so as to prevent detachment, uniform degree of welding, and improve the degree of welding. uniform effect

Active Publication Date: 2019-04-16
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, there is also a problem that the piston main body is detached from the plunger main body when blood is returned in order to confirm that the patient has been properly punctured.

Method used

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  • Syringe plunger, method of manufacturing same, and medical syringe
  • Syringe plunger, method of manufacturing same, and medical syringe
  • Syringe plunger, method of manufacturing same, 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 the present 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] Such as figure 1 and figure 2 As shown, the syringe 10 of this embodiment includes: an outer cylinder 11 provided with a nozzle portion 12 at the front end; a cap 3 for sealing the nozzle portion 12; a plunger 21 provided with 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 pr...

Embodiment approach 2

[0094] based on Figure 9 and Figure 10 , Embodiment 2 of the present invention will be described below. In addition, the same code|symbol is attached|subjected to the member which has the same function as Embodiment 1, and the description is abbreviate|omitted. Figure 9 It is a sectional view showing the syringe plunger of the medical prefilled syringe according to the second embodiment. Figure 10(a) is a side view showing the gasket and connecting portion of the syringe plunger, (b) of this figure is a cross-sectional view showing the gasket and connecting portion, and (c) of this figure is showing the connecting portion cutaway view.

[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. Also, the plunger 21 and the connecting portion 61 have a connectable and detachable structure due to the screwing of the ...

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Abstract

Provided are a syringe plunger, a method of manufacturing the same, and a medical syringe, with which a degree of welding at a contacting surface of a gasket and a plunger body is uniform, and with which it is possible to prevent the gasket becoming detached from the plunger body, and to prevent the occurrence of shape deformation resulting from positional displacement and strain of the gasket when the plunger body is being mounted onto the gasket. According to the present invention, a syringe plunger (21) is provided with a plunger body (20), a connecting portion (24) provided at a distal endof the plunger body (20), and a gasket (23) a distal end of which is closed and a rear end of which is open, and which accommodates at least a portion of the connecting portion (24) from the rear endside. A recessed portion (27) is provided in a central portion of a distal end surface of the connecting portion (24). The recessed portion (27) is a molten resin receiving portion for receiving molten resin for gasket molding that is supplied when the gasket (23) is being molded, and an inner wall surface of the gasket (23) is welded to the connecting portion (24) at a contacting surface including at least the recessed 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, the present invention relates to a plunger for a syringe capable of preventing displacement and shape deformation of a gasket, 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(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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