Locking clip with trigger bushing
View Patent ↗A safety shield incorporating a locking clip to prevent inadvertent sticks or punctures by a needle is provided. The needle can be a needle cannula or other piercing member, disposed in a sliding orientation in the safety shield, such that the needle slides within the locking clip between an aperture at a proximal end of the locking clip and a trigger hole at a distal end of the clip. Upon withdrawal of the needle after use, a binding orientation is triggered when the needle tip is withdrawn from the trigger hole. As further protection to the bi-directional lock afforded by the binding orientation, the needle is provided with a safety stop to prevent movement of the needle tip through the aperture. In other aspects, the safety shield includes a trigger bushing, in which the needle cannula is slidably received, that is sized larger than the aperture.
1. A method of using a safety shield incorporating a clip, comprising:
positioning a needle through a catheter hub, a trigger hole defined within a first leg of a body of the clip, and an aperture defined in the body of the clip between a second leg of the body of the clip and the first leg of the body of the clip;
maintaining the clip in a sliding orientation;
connecting at least a portion of the clip to the catheter hub;
withdrawing the needle from the catheter hub and through the trigger hole to allow the first and second legs to converge towards each other such that the portion of the clip connected to the catheter hub becomes disconnected from the catheter hub and the clip moves into a binding orientation in relation to the needle; and
preventing the needle from withdrawing through the aperture by providing a stop member on the needle.
2. The method of claim 1 , wherein preventing the needle from withdrawing includes preventing movement of the needle through the aperture with at least a dimple of the stop member.
3. The method of claim 1 , further including positioning a trigger bushing about at least a portion of the needle, the trigger bushing being sized larger than the aperture.
4. The method of claim 3 , wherein positioning the needle includes positioning the trigger bushing between the stop member and the aperture.
5. The method of claim 3 , further comprising abutting the trigger bushing against the body of the clip to prevent withdrawal of a distal end of the needle through the aperture.
6. The method of claim 1 , wherein connecting the clip includes releasably engaging the catheter hub with a hook portion of the clip when the clip is in the sliding orientation.
7. The method of claim 1 , further comprising biasing the first and second legs of the clip for convergent movement with a spring member of the second leg of the clip.
8. The method of claim 1 , further comprising contacting the needle with a bearing surface of the second leg of the clip.
9. The method of claim 1 , further comprising positioning the needle in a clearance opening defined in the first leg adjacent to the trigger hole as the clip moves into the binding orientation.