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Reusable, spring driven autoinjector with shape memory alloy drive spring

A technology for auto-injectors and memory alloys, which is applied in the direction of auto-injectors, syringes, ampoule syringes, etc., and can solve problems such as increased injection force

Inactive Publication Date: 2005-02-09
ALZA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be appreciated that when the viscosity of the medicament to be delivered increases, not only does the injection force required to deliver the medicament increase, but also the force required to trigger the drive mechanism increases.

Method used

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  • Reusable, spring driven autoinjector with shape memory alloy drive spring
  • Reusable, spring driven autoinjector with shape memory alloy drive spring
  • Reusable, spring driven autoinjector with shape memory alloy drive spring

Examples

Experimental program
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Embodiment Construction

[0014] A schematic representation of one embodiment of a syringe 10 according to the invention is shown in figure 1 available in . as by reference figure 1 It can be seen that the syringe of the present invention includes a housing 20 , a drive mechanism 30 , a syringe 40 and a trigger mechanism 50 . like figure 1 As can be seen, the housing 20 of the syringe 10 is divided into a proximal portion 22 and a distal portion 24 . The proximal portion 22 is adapted to house the drive mechanism 30, which includes the SMA drive spring 32 and the driver 34, while the distal portion 24 of the housing 20 houses the syringe 40, which includes a container 42 adapted to hold a medicament 44 for extraction from the container. 42 plunger 46 that expels medicament 44, and needle 48 through which medicament 44 may be injected into a subject. This distal portion 24 of the housing 20 is shaped such that a syringe 40 can be loaded onto the distal portion 24 of the housing 20 in preparation for...

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PUM

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Abstract

The present invention provides a reusable spring driven autoinjector. The drive mechanism of the autoinjector of the present invention includes one or more drive springs formed of a shape memory alloy. Therefore, by alternating the shape memory alloy forming the one or more drive springs between austenite phase before an injection and a martensite phase after injection, the reusable autoinjector of the present invention is capable of providing an injection force that is higher than the compressive force required to cock the drive mechanism in preparation for a subsequent injection operation.

Description

[0001] background technical field [0002] The present invention relates to reusable automatic injection devices. In particular, the present invention relates to automatic injection devices comprising a spring-loaded drive mechanism comprising one or more drive springs formed from a shape memory alloy. Background technique [0003] Automatic injectors (hereinafter "autoinjectors") comprising a needle injection mechanism are well known and are believed to present several advantages over simple hypodermic injectors. For example, since autoinjectors can be designed to automatically and reliably deliver required doses of medicaments, they facilitate quick, convenient and precise delivery of medicaments. In particular, auto-injectors are well suited for use by subjects who must self-administer a therapeutic substance, or by healthcare professionals who must inject multiple subjects within a relatively short period of time. In addition, autoinjectors that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/20
CPCA61M2205/0266A61M5/2033A61M2005/2418A61M2005/206A61M5/20A61M5/315A61M5/178
Inventor S·吉尔伯特P·德拉塞尔纳
Owner ALZA CORP