Safety needle

A needle and body technology, applied in the field of improved safety injection needles, can solve the problems of difficult assembly of safety injection needles, fragile guide rails and locking mechanisms, and difficulty in molding collars, etc., and achieves robust design, easy assembly, and reduced assembly. effect of difficulty

Inactive Publication Date: 2006-08-16
NMT GRP PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One problem with this method of locking the extended position of the cannula is that after the device is used, the rails and locking mechanism formed in the collar are fragile and easily damaged, allowing the cannula to be retracted and needle exposed again
Additionally, due to the small size of the safety needle, there are difficulties in molding the collar
Assembly of the safety needle can also be difficult due to the small and fragile nature of these parts

Method used

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Embodiment Construction

[0047] Referring to Figures 1, 2 and 3, safety injection needle 20 is a modified needle used in conjunction with a typical syringe (not shown). The safety injection needle 20 is provided with a slidable sleeve 22 . Referring to FIG. 1 , the cannula 22 is shown in an initial position in which the tip 26 of the needle 28 emerges from the end 24 of the cannula 22 . Cannula 22 is free to move rearwardly against the bias of spring 42 but cannot move toward needle tip 26 . When using the safety injection needle 20, the needle end 26 is inserted into the patient so that the cannula end 24 contacts the patient's skin. As the needle continues to be inserted, the cannula 22 retracts to the position of FIG. 2 . In this position, cannula 22 remains in contact with the patient so needle 28 is not exposed. Once the safety needle 20 has been used and removed from the patient, the cannula 22 is slid back to a fully extended position. The sleeve 22 extends outwardly beyond the initial posi...

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Abstract

A safety needle (20) for use with a syringe including a casing (30) in which a needle (28) for injections or blood drawing is mounted. A sleeve (22) is slidably mounted in the casing (30). The sleeve (22) is biased by a spring (42) into a partially extended position, exposing only the sharp tip (26) of the needle. As the needle (28) is inserted into a patient, the sleeve (22) retracts into the casing. When the needle (28) is removed, the sleeve (22) returns to a fully extended position and by operation of a locking mechanism locks into place. The locking mechanism includes a plurality of fingers (62), at least one of which has a projection (64) formed thereon. The projection (64) travels along a track system (66) integrally formed in the inner wall (56) of the casing (30) to move from the initial sleeve position to the retracted position and then back to a locked position in which contact with the used needle (28) and reuse of the safety needle (20) is prevented.

Description

technical field [0001] The present invention relates to an improved safety injection needle for use with a syringe and its accessories. Background technique [0002] In the medical industry, injection devices such as syringes and needles are used every day. Safety precautions should be taken to protect users, phlebotomists, nurses, doctors, or medical technicians from being stuck with used needles and to prevent possible transmission of blood-related diseases. Additionally, precautions must be taken to avoid the same needle being used more than once. [0003] The prior art has provided safety injection needles comprising a slidable sleeve surrounding the needle, such as described in US Patents 4,813,940 and 5,104,384, assigned to the assignee of the present invention. A sleeve covers the shaft of the needle, leaving the tip of the needle exposed prior to use. When the needle is inserted into a patient, the cannula contacts the patient and retracts into the safety needle s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/32A61M5/34
CPCA61M5/326A61M2005/3267A61M5/346A61M5/3272A61M2005/3247
Inventor 菲利普·理查德·达米安·阿吉厄斯马丁·史蒂文·怀利·本内特大卫·约翰·塔吉尔
Owner NMT GRP PLC
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