The present invention relates to a vein detained needle, particularly to a safe detained needle for preventing needle pricking.
For the prevention of pain caused by puncturing for injection several times, a vein detained needle is generally used for a patient who requires intravenous injection several times.
In general, the vein detained needle comprises a detained trocar and a puncture needle. When the vein detained needle is used clinically, the detained trocar is leaded by the puncture needle to enter the vein of human body. When the puncture of vein is confirmed after blood return is found, the puncture needle is withdrawn, and only the detained trocar is detained in the vein. And then, the detained trocar can be used for medicament infusion or blood extraction from the vein.
There is no protective structure for the conventional vein detained needle. The puncture needle is exposed outside after been withdrawn. The medical personnel is probably wound and infected by the puncture needle adhered with blood of the patient. Furthermore, the puncture needle with blood of the patient is also troublesome for medical waste disposal.
It is an objective of the present invention to provide a vein detained needle, more particularly a safe detained needle for preventing needle pricking.
It is another objective of the present invention to provide a safe detained needle with a protective seat for containing the tip of the withdrawn puncture needle.
The present invention provides a safe detained needle, comprising: a trocar seat having a front end and a back end; a detained trocar disposed at the front end of the trocar seat; a protective seat assembled at the back end of the trocar seat, wherein the protective seat comprises a through hole, a rebound unit, and a sticking plate; a needle seat having a containing space for containing the protective seat; and a puncture needle having a tip, an end portion and a holder portion disposed near the tip, wherein the end portion of the puncture needle is fixed in the needle seat, the tip of the puncture needle passes through the through hole of the protective seat, the sticking plate, the rebound unit, the trocar seat, and the detained trocar, wherein the tip of the puncture needle is restricted in the protective seat by the rebound unit, sticking plate and the holder portion after the puncture needle is withdrawn from the detained trocar and the trocar seat.
In one embodiment of the present invention, the holder portion of the puncture needle is embodied by a flat portion.
In one embodiment of the present invention, the protective seat comprises a first recess and a second recess for disposing the rebound unit and the sticking plate respectively.
In one embodiment of the present invention, the sticking plate comprises a sticking hole for sticking the holder portion of the puncture needle.
In one embodiment of the present invention, the sticking hole has a diameter slightly greater than a diameter of the puncture needle and slightly smaller than a width of the holder portion.
In one embodiment of the present invention, the rebound unit comprises a blocking plate with a blocking portion, wherein the blocking portion blocks the through hole of the protective seat when the blocking plate is free from stress.
In one embodiment of the present invention, the blocking portion of the blocking plate is away from the through hole of the protective seat when the blocking plate is bent by the puncture needle.
In one embodiment of the present invention, the rebound unit further comprises a support plate.
In one embodiment of the present invention, the trocar seat is selectively one of a straight trocar seat or a Y-shaped trocar seat
In one embodiment of the present invention, the trocar seat is a Y-shaped trocar seat with an isolation plug, and the puncture needle comprises a blood return groove disposed between the tip and the holder portion.
Referring to
When assembling the safe detained needle 10, the end portion 145 of the puncture needle 14 is pierced through the through hole 161 of the protective seat 16 and the sticking hole 173 of the sticking plate 17 from the front end of the protective seat 16, and is fixed in the needle seat 18. Wherein the blocking plate 153 of the rebound unit 15 is bent for the blocking portion 155 to be away from the through hole 161 of the protective seat 16. The detained trocar 11 and the trocar seat 12 are slipped on the puncture needle 14 to the protective seat 16 with the tip 143 out of the detained trocar 11.
Referring to
When withdrawing the puncture needle 14, the protective seat 16 is firstly propped to prevent the trocar seat 12 from shifting, and then the needle seat 18 is pulled backward to withdraw the puncture needle 14. When the holder portion 141 of the puncture needle 14 is pulled to the position of the sticking plate 17, the holder portion 141 will be stuck by the sticking hole 173. Besides, once the tip 143 of the puncture needle 14 is away from the blocking plate 153 of the rebound plate 15, the blocking plate 153 rebounds and the blocking portion 155 blocks the through hole 161 of the protective seat 16. This prevents the tip 143 of the puncture needle 14 from being exposed outside.
After the puncture needle 14 is withdrawn, the protective seat 16 and the trocar seat 12 are separated, only the detained trocar 11 is detained in the vein.
In one embodiment of the present invention, the diameter of the sticking hole 173 is slightly greater than the diameter of the puncture needle 14 and slightly smaller than the width of the holder portion 141.
Referring to
The Y-shaped trocar seat 82 comprises an isolation plug 821 for preventing the blood or medicament from leaking out. The puncture needle 14 comprises a blood return groove 841 disposed between the tip 143 and the holder portion 141 for observing blood return. The end portion 145 of the puncture needle 14 is fixed and closed in the needle seat 18.
In one embodiment of the present invention, the holder portion 141 of the puncture needle 14 is embodied by a flat portion. In one embodiment of the present invention, the flat portion is formed by clamping the puncture needle 14 at a predetermined position. The flat portion with a wider width can be stuck by the sticking hole 173 of the sticking plate 17.
In one embodiment of the present invention, the protective seat 16 comprises a first recess 163 and a second recess 167 for disposing the rebound unit 15 and the sticking plate 17 respectively.
In one embodiment of the present invention, the rebound unit 15 further comprises a support plate 157 for supporting the rebound unit 15 when the blocking plate 153 is bent and preventing the rebound unit 15 from being shifted.
By using the safe detained needle 10 and 80, the tip 143 of the puncture needle 14 with the blood of the patient is contained in the protective seat 16. This prevents the tip 143 of the puncture needle 14 from being exposed outside. The safety of the medical personnel is ensured, and the difficulty of medical waste disposal is reduced.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Number | Date | Country | Kind |
---|---|---|---|
201320165689.4 | Apr 2013 | CN | national |