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Low-resistance syringe

A low-resistance syringe and syringe technology, applied in the directions of syringes, hypodermic injection devices, infusion sets, etc., can solve problems such as inability to achieve sealing, and achieve the effects of low resistance, structural optimization, and consistent extrusion pressure

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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Examples

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Embodiment Construction

[0018] see figure 1 , a low-resistance syringe, comprising a casing 1 and a push rod 2 slidably connected in the casing 1 . A piston 3 is connected to the head end of the push rod 2 through a connecting head 4 . The piston 3 is in sealing and sliding connection with the inner hole of the outer casing 1, and a front cavity 101 at the front end of the piston 3 and a rear cavity 102 at the rear end of the piston 3 are formed in the inner hole of the outer casing 1 .

[0019] see figure 2 and Figure 4 , There is a front cavity end surface 1011 in the front cavity 101 of the jacket, and an injection outlet is arranged in the middle of the end surface. The front cavity end surface 1011 is a conical surface with a large cone angle. A pressure plate end surface 4012 is also provided at the front end of the connecting head 4 , and the pressure plate end surface 4012 is provided with a tapered surface matched with the front cavity end surface 1011 . After the push rod 2 is pushed...

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Abstract

The invention discloses a low-resistance syringe, which comprises a jacket, a piston and an injection rod. The piston is arranged at the head end of the injection rod; the head end of the injection rod is connected with a connector, and the piston is hermetically sleeved on the connector; at least the front end of the piston is provided with a recess; a press plate is arranged on the connector, 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 the front end 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 the 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 medical injector, which comprises a casing, a piston and an injection rod; the piston is arranged at the head end of the injection rod. 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 who...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/31A61M5/315
Inventor 朱乔平陈巧芳
Owner 浙江龙德医药有限公司
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