Low-resistance piston component of syringe

A technology of piston assembly and low resistance, which is applied in the field of low resistance piston assembly, can solve problems such as inability to achieve sealing, and achieve the effects of low resistance, consistent extrusion pressure, and structural optimization

Active Publication Date: 2013-11-13
浙江龙德医药有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the syringe with the piston structure will be fastened and locked with the piston when the push rod is pulled, and the insert will no longer make the piston expand outwards, so the seal with the barrel body cannot be achieved.

Method used

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  • Low-resistance piston component of syringe
  • Low-resistance piston component of syringe
  • Low-resistance piston component of syringe

Examples

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Comparison scheme
Effect test

Embodiment Construction

[0019] see figure 1 with figure 2 , a low-resistance piston assembly for a syringe, which is used to form a low-resistance syringe with a jacket 1 used in conjunction with it and a push rod 2 connected with the piston assembly. Wherein, the piston assembly includes a piston 3 and a connecting head 4 sheathed in the piston 3 . The piston assembly is in sealing sliding connection with the inner hole of the outer casing 1, and a front cavity 101 at the front end of the piston assembly and a rear cavity 102 at the rear end of the piston assembly are formed in the inner hole of the outer casing 1.

[0020] see image 3 with Figure 4 , the piston 3 is sheathed on a neck 402 of the connecting head 4 through the piston inner hole 303 in the middle of the piston. A recess 301 is provided at the head end of the piston 3 , and a lip 302 is provided on the outer periphery of the recessed end of the piston 3 . Two sealing protruding rings 304 are arranged near the depression in the ...

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Abstract

The invention discloses a low-resistance piston component of a syringe, which comprises a piston and a connector. The piston is provided with a piston inner hole, and the connector is sleeved in the piston inner hole; at least the front end of the piston is provided with a recess; the connector is provided with a press plate corresponding to the recesses and a neck corresponding to the piston inner hole; the press plate is provided with a conical peripheral surface with the large outer end and the small inner end, and the diameter of the outer end of the press plate is larger than that of a front port of each recess; the depth of each recess is equal to the thickness of the press plate; the length difference between the connector and the piston is equal to the depth of each recess; and a lip is arranged on the outer peripheral edge of each end, with the corresponding recess, of the piston. Due to expansion of air pressure in cavities at front and rear ends of the piston during pushing and pulling and squeezing of the press plate, the piston is adaptive to the pressure of a hole wall in a jacket, and push-and-pull resistance of the syringe is reduced.

Description

technical field [0001] The invention relates to an injection device, in particular to a low-resistance piston assembly of a syringe, which cooperates with a syringe jacket and a push rod to form a low-resistance syringe. Background technique [0002] A syringe is a commonly used medical device. Usually a syringe includes a housing and a plunger rod. In order to obtain a better sealing effect, the piston needs to fit tightly with the inner wall of the casing. As a result, it is very difficult for the operator to operate, which greatly increases the labor intensity of the user. The Chinese invention patent with the notification number CN100435871C ​​discloses a low-resistance syringe, which includes an injection barrel and a liquid-pushing plunger sliding in the barrel. The piston fixing device has a fitting part arranged above the sealing ring and a supporting part arranged under the sealing ring. The edge of the fitting part is provided with a flange whose lower end is ju...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/315
Inventor 朱乔平陈巧芳
Owner 浙江龙德医药有限公司
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