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Spring assembly in an injection device

An injection device, injection needle technology, applied in the directions of syringes, automatic injectors, hypodermic instruments, etc.

Active Publication Date: 2013-09-18
YPSOMED AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the mentioned device, the balance of the spring force is a big challenge

Method used

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  • Spring assembly in an injection device
  • Spring assembly in an injection device
  • Spring assembly in an injection device

Examples

Experimental program
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Effect test

Embodiment Construction

[0038] Figure 1a , 1b 9a, 9b show a preferred embodiment of the injection device. especially with reference to Figure 1a and 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.

[0039] 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 produ...

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Abstract

An injection device, in some embodiments an autoinjector, which includes a thrust spring that advances an injection needle from an initial position to an insertion position from the distal end of the injection device and that causes a product to be emptied from the product reservoir by an emptying movement, and a return spring that retracts the injection needle from the insertion position into the distal end of the injection device counter to the force of the thrust spring, wherein the return spring is decoupled from the thrust spring during the emptying 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 removing and withdrawing an injection needle at the distal end of the injection device. Background technique [0002] No. 3,797,489 discloses an injection device having an advancing spring acting on a product container or a piston of the product container and a spring acting against the advancing spring via the product container. This counteracting spring has three tasks, namely as a shock absorber, as a safety mechanism and as a means for retracting the injection needle by a small amount. The advancing spring is coupled to the counteracting spring both during the piercing operation via a fixed coupling to the product container and during the dispensing movement through the liquid of the product container. In the mentioned devices, the balance of the elastic forces is a big ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M5/20A61M5/32
CPCA61M5/3287A61M2005/2073A61M2205/581A61M5/3157A61M2005/206A61M5/3204A61M2005/3118A61M5/3257A61M5/2033A61M5/326A61M2205/582A61M5/3202A61M5/31511A61M2005/2013
Inventor U·斯特雷特M·博伦巴赫P·霍斯泰特勒D·孔兹利
Owner YPSOMED AG
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