Disposable safety lancet

Abstract

The invention relates to the technical field of medical devices, and specifically discloses a disposable safety blood collection needle, which at least includes a housing, a needle core, a needle cap, an inner sleeve, a driving spring and a retracting spring. The inner sleeve has a first position and the second position, the driving spring is located between the needle core and the housing and has a first pre-tightened state; the needle core is provided with a pair of opposite first steps facing the side of the needle cap, and the inner sleeve A pair of oppositely disposed first elastic arms are provided, and a second step for abutting against the first step is provided on the first elastic arms; a separation mechanism is provided in the housing. The driving spring of the present invention has multiple functions. In the process of compressing the inner sleeve, due to the need to overcome the elastic force of the driving spring and compress the driving spring, the force required to trigger the ejection of the needle core is greater, which can prevent unconsciousness due to small The excessive force causes the needle core to be falsely triggered; the structural design is ingenious, and the state of whether the needle core is ejected is accurately judged.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a disposable safety blood collection needle. Background technique [0002] Disposable safety blood collection needle is a commonly used medical device, which is used to puncture the patient's skin quickly to collect blood from the patient. [0003] In the prior art, there are many structural forms of disposable safety blood collection needles, many of which are relatively complicated and costly. Among them, the Chinese invention patent with the notification number CN210433488U discloses a simple safety blood collection needle. The structure includes a shell, a spring, a needle core, a needle cap and an inner sleeve. The plastic part at the junction of the core and the needle cap can be broken off, thereby exposing the needle. Then, press the inner sheath to make the inner sheath move relative to the outer shell, and move until the locking of the needle core is released,...

AI Technical Summary

Problems solved by technology

[0006] (1) Since there is no retraction spring, after the needle core is ejected, the action of retracting the needle point into the inner sleeve is still completed by the same spring. One of the defects of this structure is that the needle point will reciprocate and vibrate, because the reciprocating motion is If it is completed in a very short period of time, it will cause multiple finger punctures, the pain will be obvious, and the wound will become larger or more; another defect is that the two ends of the spring need to be fixed with the shell and the needle core respectively to realize the retraction of the needle point However, the fixing of the spring and the inside of the shell is very cumbersome in assembly and cannot be fixed directly. Usually, auxiliary connection structures or adhesive forms are required, resulting in complex assembly and low assembly efficiency.

[0007] (2) After installation, the spring remains in the energy storage state, and there is no connection between the inner sleeve, the spring and the needle core. Before triggering the ejection of the needle core, the process of pressing the inner sleeve has a poor experience, and the inner sleeve is blocked After pressing and not pressing in place, the position of the inner sleeve will not change. Therefore, when the inner sleeve is not pressed in place, the user cannot tell whether the needle core has been triggered because the position has changed.

[0008] (3) During transportation or transfer, the position of the inner sleeve will change due to vibration, which may cause the needle core to be triggered when the vibration amplitude is relatively large

[0009] (4) During the process of rotating and separating the needle cap and the needle core, the axial position of the needle cap will not change until the joint is twisted off, and the operator needs to rotate the needle cap to a certain angle so that the needle cap can be removed from the blood collection hole. Take it out, the operation is cumbersome, time-consuming, and the convenience is poor

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