TH26292A - Needle retraction mechanism - Google Patents

Abstract

What has been revealed is Fluid manipulation device with received needle retraction assembly. Optimized for the formation of hollow needle retraction after use consisting of a hollow body section with one end of the prepared end with a segmented end wall. stick The location consists of a needle passageway, and a hollow needle with a path. Installed and been built To be suitable for the movement between the first position where the leading end of the needle is exposed. Coming from the front end of the above mounting part And the second position where the needle will be reversed. Back to the hollow body. The aforementioned mounting paths are integrated into a flexible path that Performing the duty of pushing the needle to the second position all the time, the needle as mentioned will be aligned. Prepared with a larger portion located further away from the leading tip of the needle. And a retention path will be provided in the area to keep the needle in the first position. Until the use has been completed and the above-mentioned method will be the O-ring that Place the compression in the shoulder, along the circumference of the larger part mentioned above and Will lean against the tip of the casing where it can be pushed forward to eject the o-ring from Groove so that the needle is able to move from the first position to the second position under the action of the trajectory. The above flexibility

Claims (11)

1. A fluid handling device with a retractable needle assembly is constructed to accommodate the retraction of a hollow needle after use. It consists of a hollow body (4) with one end prepared with an end wall (14) containing a mounting section (8) with a needle passage, and a hollow needle (10) with a mounting trajectory constructed to allow movement between a first position, where the leading tip of the needle protrudes from the front end of the aforementioned mounting section, and a second position, where the needle is retracted into the hollow body. The mounting trajectory incorporates a flexible trajectory (28) that pushes the needle into the second retractable position. The needle is prepared with a larger section (18) away from the leading tip of the needle, and a holding trajectory is prepared in that area to hold the needle in the first position until the use is complete. And the aforementioned elastic trajectory will be an O-ring (20) pressed into the shoulder along the circumference (19) in the larger part mentioned above and will press against the end of the sleeve (36) which can be pushed forward to release the O-ring so that the needle can move from its first position to its second position under the action of the aforementioned elastic trajectory. 2. A fluid handling device consistent with claim 1, in which the sleeve is fixed in place so that it does not move to the rear when the needle is in the first position, by the shoulder (37) which is pressed against the front of the flange (39) at the front end of the body. 3. A fluid handling device consistent with either claim 1 or 2. The elastic path shall be a compression spring arranged between the front support surface (30) provided by the mounting section and the rear support surface (26) provided by the front end of the larger section. 4. A fluid handling device that conforms to any one of claims 1 through 3, where, when the needle is in its first position, the O-ring is pressed between the larger part and the mounting part, which creates a gap (35) at its front end for the O-ring when it is released. 5. One of the fluid handling devices consistent with the preceding claims shall be a syringe (2) supplied with a plunger (6) which may be pressed through the body to deliver fluid through the needle. The plunger is in the form of a closed tube with a front end supplied with a sealing assembly (44) which can be separated from the end by coupling with a sleeve when the plunger is fully pressed to create a channel in the end for the needle to pass into the inside of the plunger when the needle is in the second position. 6. The syringe, in accordance with claim 5, shall have an offset mounting point located adjacent to the perimeter of the body. 7. A syringe conforming to claim 6, the cross-section of the body and piston shall be of a type that prevents incorrect assembly, taking into account the position of the closure component. 8. A syringe conforming to claim 6, the cross-section of the body and piston shall be such that, while allowing assembly in more than one relative rotational position, correct assembly shall be certified, there shall be more than one enclosed component at the end of the piston. 9. A syringe conforming to claim 8 may have an oval cross-section in its body and piston, and shall have two spaced-out closure assemblies at the end of the piston. 10. Fluid handling devices consistent with any of the claims 1 through 4, the hollow body is not intended to receive a piston, and a piston-like instrument (88) may be inserted into the body to cause recoil into the needle instrument (56) when needed. 11. A fluid handling device consistent with claim 10, whereby the casing may be provided in a recess (82) accessible by a smaller section (92) at the front end of the instrument which is adjusted into the recess to engage with the casing (Clause 11, page 2, Figure 13).