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Plunger assembly, medical solution injection device, and driving method for plunger assembly

A technology of assembly and plunger, which is applied in the directions of instruments, infusion sets, automatic injectors introduced into the body, etc., can solve the problems of insufficiency and reduce the effect of medicinal liquid, and achieve the effect of effective miniaturization

Active Publication Date: 2021-12-28
TERUMO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The push rod mechanism in the prior art is not effective in reducing the size of the liquid medicine delivery device because only a single push rod advances relative to the threaded shaft

Method used

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  • Plunger assembly, medical solution injection device, and driving method for plunger assembly
  • Plunger assembly, medical solution injection device, and driving method for plunger assembly
  • Plunger assembly, medical solution injection device, and driving method for plunger assembly

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Embodiment Construction

[0081] Hereinafter, preferred embodiments will be given, and the plunger assembly, the drug solution injection device, and the driving method of the plunger assembly according to the present invention will be described with reference to the drawings.

[0082] figure 1 The shown medicinal solution administration device 10 of this embodiment is used to administer the medicinal solution M into a living body. The medical solution injection device 10 continuously injects the medical solution M filled in the medical solution container 12 to the biological body within a relatively long period of time (for example, several minutes to several hours) under the pushing action of the plunger assembly 14A. Delivery in vivo. The medicinal solution administration device 10 may intermittently administer the medicinal solution M into the living body. Examples of the medicinal solution M include protein preparations, narcotic analgesics, diuretics and the like.

[0083] Such as figure 1 As ...

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Abstract

The plunger assembly (14A) of the liquid medicine injection device (10) has: a feed screw (48) having an external thread portion (62) and an extension portion (63); A plunger (50); a second plunger (52) having a nut receiving portion (88); a nut member (54) provided with a second internal thread portion (54a); and a guide for guiding the second plunger (52) Base part (56). The nut housing part (88) accommodates the nut member (54) in a non-rotatable and axially movable manner.

Description

technical field [0001] The invention relates to a plunger assembly, a medicinal liquid injection device and a driving method for the plunger assembly. Background technique [0002] Conventionally, there is known a syringe pump type drug solution injector, which injects the drug solution filled in the barrel into the living body under the pushing action of the push rod. In addition, as disclosed in the pamphlet of U.S. Publication No. 2013 / 148270, a mechanism is known in this kind of liquid medicine injection device, which screw-engages the push rod with the threaded shaft, and advances the push rod under the rotation of the threaded shaft. (hereinafter referred to as "the push rod mechanism of the prior art"). [0003] However, in recent years, the miniaturization of drug solution administration devices has progressed, and devices of the type that are attached to the body have also appeared. In particular, in the case of a drug solution injection device that is attached to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/315A61M5/142A61M5/145
CPCA61M5/142A61M5/145A61M5/315A61M2005/31518A61M5/31511A61M2005/3152A61M5/31583A61M2005/31588A61M5/20A61M5/24A61M5/14566A61M5/14244A61M5/1452A61M5/178A61M5/31528
Inventor 小川淳一近藤晃饭渕瑠璃子
Owner TERUMO KK