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Collapsible syringe cartridge

A syringe barrel, retractable technology, applied in the direction of syringes, auto-injectors, ampoule syringes, etc., can solve the problem of increasing the length of plungers and auto-injectors

Inactive Publication Date: 2005-02-23
ALZA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accordingly, prior art syringe barrels are generally not suitable for use with autoinjectors designed to apply injection forces of sufficient magnitude required to deliver viscous drugs, which may require injection forces in excess of 100 lbs
Also, where prior art syringe barrels include a mechanism that biases the syringe in the retracted position, the syringe barrels are typically designed such that the autoinjector includes a plunger that must have a length equal to or greater than the stroke of the syringe plus the length of the syringe in the barrel. The stroke of the upper piston in the syringe
This requirement adds unnecessary length to the plunger and auto-injector itself

Method used

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Examples

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Embodiment Construction

[0018] The syringe barrel 100 of the present invention includes a syringe 200 , a biasing mechanism 300 and a housing 400 . The syringe barrel 100 of the present invention may also include an adjustable tip 500, if desired.

[0019] The syringe 200 included in the syringe barrel 100 of the present invention includes a barrel 210 , a needle 220 and a piston 230 . The syringe 200 may also include a load transfer ring 240 located at the distal end 218 of the barrel 210 . If included, load transfer ring 240 may be constructed of any suitable material, such as natural or synthetic rubber or a polymeric material or metal or metal alloy. The load transfer ring 240 may serve to absorb or distribute shock as the syringe 200 is pushed toward the end of its stroke within the syringe barrel 100 . Additionally, the load transfer ring 240 may be used only to transfer at least a portion of the load applied to the barrel 210 of the syringe 200 to the housing 400 of the syringe barrel.

[0...

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PUM

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Abstract

The present invention provides a syringe cartridge that is sufficiently robust to be used in autoinjectors that generate injection forces sufficient to deliver viscous medicaments. The syringe cartridge of the present invention includes a syringe, a bias mechanism, and a casing. The casing of the syringe cartridge of the present invention includes a collapsible portion and a fixed portion. Advantageously, the collapsible portion of the casing collapses within the fixed portion of the casing as the syringe is driven through its stroke within the syringe cartridge. As the collapsible portion collapses within the fixed portion, the length of the syringe cartridge is effectively reduced, which, in turn, allows the use of a shorter plunger and thereby facilitates the construction of a more compact autoinjector.

Description

[0001] related application [0002] This application is a non-provisional application claiming priority under 35 U.S.C. §119 to U.S. Provisional Application 60 / 337,681, filed November 9, 2001. [0003] background technical field [0004] The present invention relates to a syringe barrel for use in an injection device. In particular, the present invention provides a telescoping syringe barrel that facilitates more compact injection devices and can be designed to generate sufficient injection force for the delivery of viscous drugs. Background technique [0005] Auto-injectors (hereinafter "auto-injectors") are well known in the medical and veterinary arts and are capable of automatically injecting desired doses of a drug into an animal or human patient. Autoinjectors are believed to present several advantages with regard to simple subcutaneous injection. For example, auto-injectors facilitate quick, convenient, and accurate drug delivery because they can be designed to aut...

Claims

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Application Information

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IPC IPC(8): A61M5/24A61M5/20A61M5/28A61M5/315A61M5/32A61M5/46
CPCA61M5/3287A61M5/2053A61M5/326A61M5/46A61M5/3271A61M5/28A61M2005/31518A61M2005/206A61M5/178
Inventor P·德拉塞尔纳S·J·吉尔伯特
Owner ALZA CORP
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