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Needle retraction mechanisms

A hollow needle, said technology, applied in the direction of needles, blood sampling devices, hypodermic injection devices, etc., can solve the problems such as inability to ensure needle retraction

Inactive Publication Date: 2003-01-15
NMT集团公开有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device does not ensure reliable needle retraction

Method used

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  • Needle retraction mechanisms
  • Needle retraction mechanisms
  • Needle retraction mechanisms

Examples

Experimental program
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Embodiment Construction

[0035] attached figure 1 The shown disposable syringe 2 comprises a hollow body portion 4, from the rear of which (as attached figure 1 The upper end shown) extends out of the piston 6. At the lower end of the hollow body part 4 there is a mounting part 8 for a needle 10 with a channel, and the inner end of the mounting part 8 has a vertical ring wall 9 .

[0036] The hollow body portion 4 is transparent, has a scale in milliliters for easy viewing and is provided with a finger-engageable flange 12 in a conventional manner. The hollow body portion 4 has a slightly flared flared end portion 15 . The mounting part 8 is fastened to the end wall of the hollow body part 4 at the eccentric position 16 (see accompanying drawing 2), so that the use of the syringe allows the needle to penetrate the tissue or blood vessel at an angle as small as possible.

[0037] The inner end of the needle 10 is connected to a sleeve 18 having an annular groove 19 in which an O-ring 20 is placed. ...

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PUM

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Abstract

PCT No. PCT / GB95 / 01894 Sec. 371 Date Jan. 29, 1997 Sec. 102(e) Date Jan. 29, 1997 PCT Filed Aug. 10, 1995 PCT Pub. No. WO96 / 05879 PCT Pub. Date Feb. 29, 1996A fluid handling device has a needle retraction assembly which brings about the retraction of a hollow needle after use. A hollow body portion is provided at one end, with an end wall having a mounting portion including a needle passage. A hollow needle having a leading end portion is movable between a first position in which the leading end portion of the needle protrudes from a front end portion of said mounting portion and a second position in which the needle is withdrawn within the hollow body portion. A spring acts to bias the needle into the second, withdrawn position. The needle is provided with a portion of enlarged diameter at a location spaced from the leading end portion. A retainer maintains the needle in its first position until use is completed. The retainer includes an O-ring positioned in a circumferential groove in the portion of enlarged diameter. The O-ring abuts the end of a sleeve slidable within the mounting portion and which can be forced forwardly to dislodge the O-ring so as to permit the needle to move from its first position into its second position under the influence of the spring.

Description

technical field [0001] The present invention relates to retraction mechanisms or improvements to retraction mechanisms for fluid handling devices which retract a hollow needle into a housing after use. Such fluid handling devices are used in various aspects in the medical field, for the administration or drip feeding of medicaments into blood vessels, or for the withdrawal of fluid samples, such as blood samples from patients. Background technique [0002] It will be appreciated that fluid manipulation devices with needles have a wide range of applications in the medical field for the administration of pharmaceuticals and sampling such as blood, including applications where multiple blood samples are obtained from a patient during a cycle. [0003] Importantly, the needles of such devices are often attempted to be disposed of after a single use, to be discarded, to prevent accidental injury, or to prevent re-use, creating a real risk of cross-contamination. [0004] Syringe...

Claims

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Application Information

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IPC IPC(8): A61B5/15A61M5/178A61M5/19A61M5/32A61M5/34A61M5/50
CPCA61M2005/342A61M5/3234Y10S128/919A61M5/508A61M5/19
Inventor 基思·赫德·尤尼·麦克马洪
Owner NMT集团公开有限公司