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Auto injector with hollow plunger rod

An automatic injector, plunger rod technology, applied in the direction of automatic injectors, syringes, hypodermic instruments, etc.

Inactive Publication Date: 2020-01-31
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the autoinjector of WO 2013 / 034986, it has been shown to be a challenge to completely empty the syringe as drug residues are left in the syringe

Method used

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  • Auto injector with hollow plunger rod
  • Auto injector with hollow plunger rod
  • Auto injector with hollow plunger rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0134] Hereinafter, an auto-injector according to any of the above-described aspects of the present disclosure will be described in more detail and with reference to the accompanying drawings. A reloadable autoinjector 10 having a housing 500 for receiving a syringe assembly 20 is provided. Syringe assembly 20 may include syringe 1000 having needle 1002, and syringe assembly 20 may be movably positioned within housing 500 between a first position and a second position in which needle 1002 is held Housed inside the housing 500 , in said second position the needle 1002 protrudes outside the housing 500 . The syringe assembly 20 may also include a syringe stop 1004 that is movably positioned in the syringe 1000 and that seals the syringe contents 1006 . The autoinjector also includes: a plunger rod 1500 configured to engage the syringe stop 1004; and a plunger rod driver 1600 configured to apply a force to the plunger rod 1500 to cause the plunger rod 1500 to rest in the syringe...

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PUM

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Abstract

Disclosed herein is a reloadable auto injector having a housing for accommodation of a syringe with a needle, the syringe being movably positioned in the housing between a first position in which position the needle is accommodated inside the housing and a second position in which position the needle protrudes outside the housing, a plunger rod configured to be advanced in the syringe for delivering at least one dose of medicament, a plunger rod tube having two or more deflectable locking members configured to interact with a plunger rod stop to normally lock the plunger rod to the plunger rodtube, a syringe driver configured to apply a force to the syringe thereby moving the syringe from the first position to the second position, the syringe driver being further configured to advance theplunger rod tube with the plunger rod to the second position, a plunger rod driver being configured to apply a force to the plunger rod to advance the plunger rod in the syringe for delivering one dose of medicament upon unlocking of each of the two or more deflectable locking members, and a reload mechanism configured to retract the syringe from the second position to the first position and reload the syringe driver to allow a repeated activation of the syringe driver.

Description

technical field [0001] The present disclosure relates to autoinjectors, such as medical autoinjectors, and in particular to reloadable autoinjectors that may be capable of delivering one or more individual doses from a drug-containing cartridge or prefilled syringe, wherein the autoinjector Includes improved configuration for emptying cartridges. The autoinjector can be configured for single or multiple use. Background technique [0002] Auto-injectors are well known in the art and are often preferred by users for self-administration of pharmaceuticals, such as for subcutaneous injections of pharmaceuticals such as insulin, medications for the treatment or relief of multiple sclerosis, colds, lupus, etc. medicines; or for emergency injections of eg epinephrine or pararenaline, such as into muscle tissue. [0003] Needles for subcutaneous injections and injections into muscle tissue are usually of different lengths. Typically, needles for subcutaneous injections are about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315A61M5/32A61M5/50A61M5/20
CPCA61M5/2033A61M5/31595A61M5/3202A61M5/326A61M5/5086A61M2005/202A61M2005/206A61M2005/208A61M2005/3267
Inventor P.B.雅各布森
Owner MERCK PATENT GMBH