TH54522A - Improved single-use safety syringe - Google Patents

Abstract

DC60 (11/06/45) Safety Syringe Cylinder Assembly consists of a generally long cylindrical tube. The taper, which has a hollow inside and forms a hollow nozzle, sits at the far end of the tube and opens into the tube. The needle is set at the far end and is fitted with a slid in the longitudinal opening of the piston to A forward-facing motion where the needle at the far end of the needle holder extends from the end. Far side of the nozzle And the retracted position in which the needle was retracted into the tube Compression spring Are installed inside the tube, and the spring holder has a spring support that extends from the inside of the The tube goes to part for installation inside the tube and supports the far end of the spring from expanding, the spring pushes the needle holder towards the retracted position. The latch has a closed position in which the needle holder can The pin is attached to the tube in order to hold the needle holder in the forward position against the push of the spring and the open position where the needle holder has been removed against the tube so that the spring can Expands in the near direction to move the needle holder to the retracted position.

Claims (7)

OCR 08PV 1. A retractable safety syringe barrel incorporating a cylindrical spring retainer (302, 1302) with a distal axial extension (603,1303, 2303), which is axially inserted and locked within the barrel (10) of the syringe barrel; a piston (11) with a compressive return-type cap (12), one or more radial extensions (70,72), and a central opening (33) capable of linear and reciprocating motion, which is inserted within the aforementioned spring retainer (302, 1302) beyond the extension; a needle holder (14,1014) which is movable in the central opening (33) of the piston (11) for movement between the forward extension positions of the needle. (13) At the distal end of the needle holder (14, 1014) protrudes from the distal end of the nozzle (15), and in the retracted position, the needle (13) is retracted into the tube (10). The distal axial extensions (303, 1303, 2303) of the spring holder (302, 1302) holding the compression spring (300) are enclosed around the needle holder (14, 1014) in such a way that the needle holder passes through the opening (310) in another axial section. (303,1303,2303) The proximal surface of the spring holder (302, 1302) has a stabilizer plate (903) to support the needle holder (14,1014) and a deflectable retaining plate (802, 902) that holds the needle holder (14, 1014) in place by the expansion force of the spring (300) until it is deflected radially by the protrusions (70, 72) of the piston (11), in response to the applied force which exceeds the fluid injection force. 2. A retractable safety syringe barrel as previously defined in claim 1, where such port (33) of such piston (11) includes a restraining element (75) for the engagement, interlocking and retention of such needle holder (14, 1014) when in the fully retracted position, such needle holder (14, 1014) having a notch at its adjacent end for the engagement of such restraining element (75). 3. A retractable safety syringe barrel as previously defined in Requisition 1, in which such piston (11) includes a restraining element (601) on the rear piston flange (64) for the engagement of the pin, to lock it in place with such syringe barrel. 4. A retractable safety syringe as previously defined in Requisition 1, which is further incorporated with a needle guard, in which the aforementioned nozzle (15) of the aforementioned tube (10) has a long, tapered male section on its outer surface that fits into the long, tapered female section of the needle guard, thus locking the long, tapered sections to form an airtight and watertight seal between the aforementioned nozzle (15) and the additional guard, in which air or fluid contained in the sealed tube (10) prevents the piston (11) from moving forward to the distal end of the tube (10), thus avoiding retraction before the syringe is used. 5. A retractable safety syringe as previously defined in Requisition 1, which includes a needle-mounted catheter (80), such catheter (80) which is mounted on and inserted in accordance with the needle (13) into the vein, such catheter (80) which remains in the vein while the needle (13) is retracted. 6. A retractable safety syringe barrel as previously defined in claim 1, where the adjacent open end of such needle (13) faces such adjacent end of such needle holder (14, 1014) and contacts such tube (10) by the side opening. 7. Retraction Control Module for Retractable Safety Syringe Barrel. This module, which comprises a hollow cylindrical tube (1302) with a distal axial projection (1303) forming a central cantilever with a central through-hole (1301) and a near-center mounting plate (1313) forming an interlocking geometry to engage and secure the needle holder (1014) to the module. The needle holder (1014) has an forward position through which the needle (13) at the distal end of the needle holder (1014) extends from the distal end of the syringe barrel, and the retraction position of the needle (13) is retracted within the syringe barrel. A coiled compression spring (300) surrounds the needle holder (1014) and is supported by the aforementioned axial projection and the central cantilever with the needle holder (1014) and the needle (13) attached through-hole. Through the center opening (1310) of the said cantilever and inside the tube (1302), the piston (11), which is compressed and engaged with the self-returning cover (12), passes through the said cylindrical tube (1302) and has two parallel walls (60, 62) that define a center opening in contact with the eccentric mounting plate (1312) without turning the said mounting plate (1312). The said piston (11) is positioned forward on the distal side. and the inclined sections (70, 72) on the parallel walls (60, 62) such that they radially deflect the retaining plate (1312) to release the needle holder (1014) and cause the needle (13) to retract when the piston is moved forward to the distal forward position. Such needle holder (1014) is installed slidingly in the center opening (33) such of the piston (11). Such retaining plate (1313), together with the raised section from the opposite surface of the hollow cylinder (1302) from the distal axial section (1303) and interlocking with the near section of the needle holder (1014), prevents the expansion of the spring (300).