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Injection device with controlled needle retraction

A technique for injection devices and injection needles, applied in the direction of syringes, auto-injectors, hypodermic injection devices, etc., which can solve the problems of missing remaining parts, incomplete injection of drugs, loss, etc.

Active Publication Date: 2010-03-24
YPSOMED AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here it can happen that the drug is not fully injected into the patient's tissue, losing the smaller remainder
This is unpleasant especially when using expensive drugs
The lost remainder can also cause problems in terms of the dose actually given

Method used

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  • Injection device with controlled needle retraction
  • Injection device with controlled needle retraction
  • Injection device with controlled needle retraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] Figure 1a , 1b 9a, 9b show a preferred embodiment of the injection device. especially with reference to Figure 1a with 1b , the injection device has a housing 1 comprising a proximal housing part 1a and a distal housing part 1b axially fixedly connected to the proximal housing part with a locking connection 1c . The locking connection 1c is formed by a window contained in the proximal housing part, into which window a spring tongue formed by the distal housing part 1b engages.

[0050] A product container 2 is received in the housing 1, at the distal end of which product container 2 there is an injection needle 4 for dispensing the liquid product contained in the product container 2 . At the proximal end, the product container 2 has a displaceable piston 3 whose movement relative to the product container 2 and in the direction of the injection needle 4 causes the product to be injected, which can therefore also be referred to as injection. out of motion. The prod...

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PUM

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Abstract

The invention relates to an injection device, especially autoinjector, which comprises: a) a housing (1), b) an actuating sleeve (6) which is mounted to be movable relative to the housing (1) and which can be placed on a point of injection of a patient with the distal end of the injection device, c) an injection needle (4) which protrudes over the distal end of the injection device when in the position of insertion and which can be moved back into the interior of the injection device, d) an actuating cam (17) which is arranged in an axially fixed manner relative to the injection needle (4) and which engages in a locking recess (20) when in the position of insertion to prevent the injection needle (4) from being retracted into the interior of the injection device, e) said actuation cam (17) being releasable from the engagement with the locking recess (20) by means of the actuating sleeve (6), thereby releasing the injection needle (4) for the retracting movement.

Description

technical field [0001] The invention is within the field of injection devices for administering liquid products, in particular medicaments. The invention relates to an injection device and a method for controlled retraction of an injection needle from a piercing position. Background technique [0002] In injection devices, especially autoinjectors, it is known to insert an injection needle into a patient by means of the mechanism of the device and to subsequently inject a product into the patient through said injection needle. After the product has been dispensed, the needle is drawn back into the injection device. [0003] For example, US Pat. No. 6,387,078 B1 discloses an injection device in which an injection needle is first pierced by means of a push spring and the product is then expelled by means of the push spring. When advancing by said advancing spring, the return spring is tensioned at the same time. After reaching the final position of the dispensing movement, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/20A61M5/32
CPCA61M5/2033A61M2205/582A61M2005/2073A61M2205/581A61M5/3257A61M2005/206A61M5/3204A61M2005/2013
Inventor U·斯特雷特M·博伦巴赫P·霍斯泰特勒D·孔兹利
Owner YPSOMED AG