MXPA95004444A - Safety syringe with internalenteretrable and selfinclinable connection exte - Google Patents

Abstract

The present invention relates to a safety syringe comprising: a syringe means including: a syringe barrel to be filled with liquid medicine, a syringe barrel longitudinally defined in a central portion of the barrel of the syringe, a portion of sleeve formed in the front portion of the cylinder, contracted and tapered forward from the cylinder, and a shoulder portion formed in the front portion of the cylinder between the syringe barrel and the sleeve portion; a pierced needle assembly including a portion hollow needle connected detachably to a spindle portion secured in the sleeve portion of the syringe means and a needle head portion connected to the spindle portion by a hollow neck portion, a central injection hole formed in the portion of head of the needle and an exhaust notch formed in the neck portion, the central injection hole and the exhaust notch were communicated with a central hole longitudinally formed through the spindle portion and communicating with the hole of the needle formed in the hollow needle portion when the hollow needle portion is engaged in the spindle portion; the needle defined in a central portion of the hollow needle assembly and normally aligned with the axis of the syringe, when the needle assembly is mounted on the syringe means for normal injection use, and a plunger means including: a sustained plunger reciprocally in the syringe barrel, a grooved thrust sleeve, rearwardly of a front surface of the piston whose piston has a longitudinal axis defined in a center of the thrust bushing to be deflected from the axis of the syringe in a sharp angle, a guide port which converges backwards from the front surface of the plunger to communicate with the thrust sleeve to slidely guide the portion of the needle head towards back inside the guide port to engage with the thrust bushing to skew or skew the hollow needle portion obliquely when the needle assembly is retracted into the syringe barrel, and a plunger rod connected to the plunger; improvement comprises: said sleeve portion including a cover opening formed in the front end portion of the sleeve portion, an annular groove annularly recessed in the inner wall of the cover opening, a truncated tapered cone-shaped socket forwardly from a cylindrical bushing lowered forwardly of the shoulder portion of the syringe means and communicating with the opening of the cover, with the cylindrical bushing having an internal diameter greater than the internal diameter of a rear end portion of the bushing in the form of a truncated cone, and with the cover opening having an internal diameter equal to the internal diameter of a portion and Frontal tip of the truncated cone-shaped bushing, all this forming a tapered through hole in the sleeve portion, as it tapers gradually forward from the shoulder portion in the middle of the syringe, the cylindrical bushing, the cone-shaped bushing truncated, the annular groove and in the cover opening, and the hollow needle portion has a coupling cover formed in the rear portion of the hollow needle portion having a bushing for a stem lowered inwardly and forwardly communicating with the needle opening formed longitudinally through the hollow needle portion and a female slot spirally lowered into the stem sleeve, said spindle portion having a truncated cone hollow portion engageable with the truncated cone shaped socket in the portion of sleeve, a packing ring secured to a front portion of the truncated cone portion and engageable with the annular groove and n the sleeve portion for retaining a front portion of the spindle portion in the sleeve portion, a hollow shank portion projecting forward from the truncated cone portion with at least one male projection circumferentially formed in the shank portion to engage with the recessed female slot in the coupling cover of the hollow needle portion for coupling removably the hollow needle portion on the spindle portion secured to the syringe means from outside the syringe barrel and an elongated cylindrical portion formed at a rear end portion of the spindle portion engageable with the cylindrical sleeve at the portion of mangui

Description

SAFETY SYRINGE WITH NEEDLE INTERNALLY RETRABLE AND SELF-LINKING INTERNAL CONNECTION BACKGROUND OF THE INVENTION U.S. Patent No. 5,232,458 issued to Long-Hsiung Chen disclosed a safety syringe characterized by having a hollow tip containing the head of a tip embedded in the posterior portion of the needle, and a sliding plunger within. of the body of the syringe that has a tilt cap on the pusher of the plunger so that the needle is biased when pulling the plunger after use, causing the assembly to retract inside the cylinder, thus preventing the exit of the needle retracted so as to avoid damage to it or infectious contamination to the surrounding medium. However, it should be noted that a conventional safety syringe as described may present the following disadvantages: 1. When the needle device (2) is mounted in the syringe (1), the needle device (2) must be inserted through the plug (13) inside the sleeve portion (12) of the syringe (1) thereby causing difficulties. 2. The syringe can not be replaced with needles of different sizes. 3. A plug (13) fits into a front portion within the syringe cylinder (11) to possibly increase the difficulty of the assembly and the production cost. The present patent relates to a safety syringe containing: a hollow tip assembly having a removable hollow needle portion attached to a rod-shaped anchoring portion, embedded in the sleeve portion of a syringe, having a part of needle in the rear part of the spindle, and a sliding plunger inside the syringe with a biased sleeve for coupling the needle assembly with the plunger during the action of retracting it into the syringe, thereby causing skewing or skewing of the shaft of the needle and preventing the needle from coming back out, whereby a variety of needles of different sizes can be mounted as a replacement on the rod-shaped anchoring portion on the outside of the syringe to beat the disadvantages of the conventional safety syringe. The present invention will be detailed below with reference to the accompanying drawings, in which: Brief Description of the Drawings Figure 1 is a schematic cross-sectional view showing all the parts in the construction of the present invention; Figure 2 is a perspective view of the hollow needle assembly of the syringe referred to in the present invention; Figure 3 is a cross-sectional view showing all the parts indicated in the present invention, the injection list; Figure 4 is a cross-sectional view of the present invention in the final position of unloading / hooking the needle in which the parts and pieces indicated in the previous figure are appreciated, once the injection is made; Figure 5 shows an inclined needle where it is seen that the end is cohesive to the posterior base of the needle and this action has inclined the needle retracted on its axis according to what is described in the present invention; and Figure 6 shows a bent needle inside the syringe to prevent its exit in accordance with what is described in the present invention. As shown in Figures 1 to 6, the present invention comprises: An injection instrument or syringe 1, a hollow needle assembly 2 mounted on the syringe or injector and a sliding plunger instrument contained within the syringe 1. The syringe comprises: a cylinder of the syringe 11 bored in its central part 10 formed inside the cylinder of the syringe 11 for if filled with medicine in liquid state 4 and a syringe shaft 100 defined longitudinally in the central portion of the cylinder of the syringe 11, a portion of sleeve 12 formed in the front part of the cylinder 11 that ends it whose diameter gradually contracts conically, a support portion 13a formed in the front portion of the cylinder 11 under the sleeve portion 12, and a handle 14 protruding in the rear part of the cylinder 11. The sleeve portion 12 comprises: a perforated cover 121 formed in the front end piece of the sleeve portion 12, an annular groove 122 formed in the lower wall of the aperture of the perforated cover 121, a truncated cone bushing 123 which contracts in its diameter from a cylindrical bushing 124 in front of the support portion 13a of the syringe 1 and communicating with the perforated cover 121. The cylindrical sleeve 124 has an internal diameter greater than the internal diameter of the rear portion of the truncated cone sleeve 123, and the perforated cover 121 has an internal diameter equal to the internal diameter of the front part of the truncated cone bushing 123, all this forming a conical hole 12a (FIG. 5) in the sleeve portion 12 that gradually contracts in diameter. or from the support portion 13a in the syringe 1 with the cylindrical bushing 124, the truncated cone bushing 123, the annular groove 122, the aperture in the perforated cover 121. The needle punched assembly 2 comprises: a hollow needle 21 with a tip end portion 211 formed in the front part of the hollow needle 21, a coupling cover 212 formed in the rear section of the hollow needle 21 containing a bushing for a rod 213 in its inner part communicating with a needle opening 210 located longitudinally to the hollow needle 21 and a female cap 214 coiled inside the stem sleeve 213; a spindle part 22 containing a truncated cone portion 22a engageable with the respective truncated cone portion bushing 123 in the sleeve part 12, a packing ring 221 engaged in an annular groove 221a resting on the front of the sleeve truncated cone portion 22a engageable with the groove of the ring 122 in the sleeve portion 12, a pierced rod 222 protruding from a truncated cone 22a having at least one male projection 223 circumferentially formed in the hollow rod 222 that is engageable with the female socket 214 which is embedded in the coupling cover 212 of the hollow needle 21 for coupling / uncoupling the hollow needle 21 in the part of the spindle 22 secured in the syringe 1 from outside the cylinder of the syringe 11; and an elongated cylindrical portion 224 formed in the rear part of the part of the rod 22 engageable with the cylindrical bushing 124 in the sleeve portion 12; and a needle head portion 23 connected to the spindle portion 22 by a hollow neck 24a generally in the form of a circular disk with a rear arcuate surface in the needle head portion 23 and a central injection hole 231 communicating with a outlet notch 24 formed in the portion of the neck 24a communicating with a central passage hole 220 longitudinally formed in the rod 22 leading to the hole of the needle 22; and a needle shaft 200 defined in the central portion of the hollow needle assembly 2, which should normally be aligned with the axis of the syringe 100 when mounting the needle assembly 2 in the syringe 1 for injection. The liquid medicine 4 flows through the central injection hole 231, the exhaust notch 24, the central hole 220 and the hole of the needle 210 to be injected into the body of a patient. The sliding piston instrument 3 comprises: a piston 31 contained in the cylinder of the syringe 11, an inclination sleeve 32 generally in an arcuate shape and recessed backwards in the upper part of the thrust surface (pusher) 310 of the piston 31 having a longitudinal axis 321 defined in the center of the cavity 32, deflectable from the axis of the syringe 100 at an acute angle A, a guide port 33 that converges from the thrust surface (pusher) 310 to communicate with the tilt bushing 32 aligned with the needle head portion 23 rearwardly by said guide port 33 coupled to the tilt bushing 32 so as to skew or skew the hollow needle 21 obliquely when the needle assembly 2 is retracted within the tracked portion 10, a piston rod 35 connected to the piston 31 by a connecting member 36 formed in the front part of the rod 35 with a recess 34 located in the rear part of the piston 3 1 and a protruding handle 37 formed on the back of the rod 35 for gripping, and a plunger shaft 100 defined longitudinally in the central portion of the plunger 31 and the rod 35 to align with the axis of the needle 200 and the axis of the syringe 100 when the needle assembly 2 is normally mounted on the syringe 1. When the present invention is used to inject, the plunger 31 is pushed forward to pump the liquid medicine 4 into the body of a patient through the needle hollow 2 as illustrated in Figure 3. After the medicine has been consumed, the head portion of the needle 23 will engage with the tilt cap 32 on the plunger 31 as shown in Figure 4 at the time which is impelled by the rod 35. When the plunger 31 and the assembled needle assembly 2 are retracted (R), the needle assembly is automatically tilted as shown in figure 5, and when pushing the assembly of the needle needle 2 frontally (F ) as shown in Figure 6, the tip 211 will bend and clog when pushed against the support portion 13a, without being able to protrude outside the syringe to avoid prodding the user, cleaners or medical personnel. The present invention is superior to the conventional safety syringe of the patent registered in the United States under No. 5,232,458 with the following advantages: 1. The hollow needle 21 can be coupled / uncoupled to the spindle part 22 by rotation (T) of the coupling cover for coupling the female groove 214 in the cover 212 with the projection 223 of the part of the stem 222 of the spindle 22 to conveniently urge the portion of the needle 21 into the syringe l from the outside. 2. A variety of needles of different sizes can be mounted as a spare on the syringe in a number of options. 3. The structure is simplified to reduce the cost of production. 4. If the retracted needle 21 within the barrel of the syringe 11 does not tilt at an angle greater than appropriate, an accidental exit of the needle outwardly can be avoided because the needle tip 211 will jam in a plurality of places. , namely: the support portion 13a, the cylindrical cavity 124, and the annular groove 122, thus ensuring a safe treatment to the retracted needle. 5. The part of the spindle 22 in the form of a truncated cone in the assembly of the needle 2 will make execute a stable coupling with the through hole 12a in the sleeve portion 12, useful to inject uniformly when the piston 31 impels the liquid medicine towards the patient during the injection. The present invention can be modified without relinquishing the spirit and scope of this invention. The assembly of the needle 2 longitudinally mounted on the syringe 1 to align with the axis of the syringe 100 as shown in Figure 1 is adapted for hypodermic injection. The needle assembly 2 can also be modified to be mounted eccentrically in the syringe parallel to the axis of the syringe 100 in intravenous injections, not limited in this invention. The spindle portion 22 can be formed with at least one projection (not shown) to be susceptible to coupling with another projection (not shown) formed in the sleeve portion 12 to prevent free rotation of the spindle portion 22 in the portion of sleeve 12 when the hollow needle portion 21 is engaged on the spindle portion 22.

Claims (1)

1. CLAIMS l. - A safety syringe comprising: a syringe composed of a syringe barrel to be filled and thus contain liquid medicine, a syringe barrel defined longitudinally in a central portion of the barrel of the syringe, a sleeve portion formed in the front portion of the cylinder constituting and bending conically forwardly from the cylinder, and a support portion formed in the forward portion of the cylinder between the cylinder and the syringe and the sleeve portion; a pierced needle assembly including a movable hollow needle, coupled to a spindle secured in the sleeve portion of said syringe and a needle head portion connected to the spindle portion by a hollow neck, a central injection hole formed in said needle head and an exhaust notch formed in the neck part; said central injection hole and the exhaust notch communicate with a central hole longitudinally configured from the spindle through the hole of the needle when coupling the portion of the hollow needle in the spindle; the assembly of the hollow needle being then longitudinally mounted in the syringe on the axis of the syringe for normal use as injection; and a piston instrument comprising: a piston contained in the cylinder of the syringe, a tilt cap contained in the upper part of the thrust surface (pusher) of the piston having a longitudinal axis defined in the center of the tilt cavity and deflectable from the axis of the syringe at an acute angle, a guide port converging backward from the thrust surface (pusher) to communicate with the tilt bushing and projectively aligned with the head part of the needle to slide guiding said part backward within the guide port to engage with the tilt cavity to skew or skew the hollow needle obliquely when the needle assembly is retracted into the syringe barrel, and a plunger rod connected to the plunger; said cuff portion contains: a perforated cover formed in the front end of the sleeve portion, an annular groove formed in the inner wall of the aperture of the perforated cover, a truncated cone sleeve which contracts conically from a cylindrical cap in front of the support portion of the syringe and communicating with the perforated cover; the cylindrical bushing has an internal diameter greater than the internal diameter of the rear portion of the truncated cone bushing, and the perforated cover has an internal diameter equal to the internal diameter of the front portion of the truncated cone bushing, all forming a hole conical in the sleeve portion that gradually contracts in diameter from the support portion towards the opening of the cover; and said hollow needle comprises a coupling cover formed in the rear section of the hollow needle containing a bushing for a rod formed in the inner part communicating with a needle opening located longitudinally with the hollow needle and a hollow spiral cap Within the rod sleeve, said spindle contains a truncated cone portion engageable with the bushing for the truncated cone portion in the sleeve portion, a packing ring secured in an inner groove for ring and engageable with the annular groove in the sleeve. sleeve portion for retaining a front portion of the spindle in said sleeve portion, a hollow stem portion protruding from the truncated cone portion with at least one male projection circumferentially formed in the stem to engage with the female notch which is recessed in the coupling cover of the hollow needle for coupling / uncoupling said hollow needle from the spindle which is secured in the syringe from outside the barrel of the syringe and an elongated cylindrical portion formed in the back of the spindle engageable with the cylindrical sleeve in the sleeve portion. SUMMARY OF THE INVENTION A safety syringe comprising: a pierced needle assembly (2) containing a hollow needle (21) removably coupled to a spindle portion (22) that is embedded in a sleeve portion (12). ) of a syringe (1) and having a needle head (23) formed on the back of the spindle (22) and a plunger (31) slidably maintained in the syringe (1) which in turn has a tilt cavity (32) located in a recess of the front part of the plunger or pusher (31) to couple the assembly of the needle (2) with the plunger (31) causing a retraction inside the syringe (1) that produces a tilt of the shaft of the needle (21) preventing the latter from protruding out of the syringe (2) and allowing a variety of pierced needles to be replaced in the spindle part outside the syringe (1) for convenient mounting of the needle needle (2) in the syringe (1). DAU