CN103405834A

CN103405834A - Self-destructive disposable syringe

Info

Publication number: CN103405834A
Application number: CN201310348187XA
Authority: CN
Inventors: 张建春
Original assignee: JIANGSU KANGYOU MEDICAL INSTRUMENT Co Ltd
Current assignee: JIANGSU KANGYOU MEDICAL INSTRUMENT Co Ltd
Priority date: 2013-08-10
Filing date: 2013-08-10
Publication date: 2013-11-27

Abstract

Disclosed is a self-destructive disposable syringe. Side guiding grooves of a push rod are formed in two sides of a rod body, retaining steps are arranged in the side guiding grooves, a unidirectional retaining part comprises an open clamping ring, retaining stabbing pieces and guiding ratchet pieces, the open clamping ring of the unidirectional retaining part is sleeved on the rob body of the push rod, the guiding ratchet pieces are located inside the side guiding grooves, and outer ends of the guiding ratchet pieces are in contact with sliding faces; the side guiding grooves are formed in the two sides of the rod body of the push rod, so that the area of a transverse section of the rod body is increased, the strength of the rod body is improved, and the defect that the rod body is prone to breakage when stressed is overcome; according to the design structure, direct installation of the unidirectional retaining part is facilitated, installation and dismounting are convenient and simple, a mandrel is not required to be pushed aside, a molding compression die structure of the push rod is simplified, the yield of molded products is improved, and reduction of the production cost is facilitated. Usage functions of the syringe are identical to those of the prior art.

Description

A kind of disposable syringes of self-destroying

Technical field:

The present invention relates to disposable syringe, relate in particular to disposable syringes of self-destroying.

Background technology:

At present, in order to prevent the cross infection of iatrogenic disease, each state all starts requirement and uses self-destruction syringe, requires to guarantee that from structure syringe is only once used, and finishing using is self-destruction, prevents that the user of service from reusing consciously again.World Health Organization (WHO) (WHO), global United Nations Children's Fund regulation started to purchase self-destroyed syringe in 2003, substituted ordinary syringe.China starts to produce self-destruction syringe, wants to capture the international market of disposable syringe, and the cheap and convenience that use of its manufacturing cost is also very crucial.Have in recent years many re-use preventing once-used syringe patent structures, wherein Chinese patent 200510063041.6 discloses and has once used self-destruction syringe, it comprises needle point, cylindrical shell, core bar, ratchet slot, limit the rank that return to Chinese Taiwan, installing hole, non return part, non-return thorn sheet, guiding ratchet sheet, packed-piston and motive position repeatedly, it is on core bar, to be provided with ratchet slot, limit the rank that return to Chinese Taiwan, installing hole and motive position repeatedly, non return part is provided with non-return thorn sheet and guiding ratchet, during assembling, non return part enters and limits the rank that return to Chinese Taiwan by installing hole, there is ratchet to withstand and limit the rank that return to Chinese Taiwan, then will be with sealing-plug to push cylinder body bottom.Although such structure can effectively reach the purpose of syringe self-destruction, but on the central axis of core bar, offer the high-precision ratchet slot of guiding, limit return to Chinese Taiwan rank and installing hole, its mould structure, difficulty of processing and the accuracy of manufacture require all very high, difficulty and cost that mould is manufactured have so just been increased, in process of production in order to guarantee finished product accuracy, must often repair mould and die accuracy, production and the specification requirement of safeguarding are very high, have raised production cost and price.Simultaneously, non return part is placed on to the step of limitting on the rank that return to Chinese Taiwan by installing hole loaded down with trivial details too, because installing hole is less, need to free-handly push aside just non return part can accurately be placed on and limit on the rank that return to Chinese Taiwan, in addition, owing on core bar, having offered installing hole, make core bar be positioned at the stressed too quickly easy fracture in position on installing hole both sides, cause the core bar damage.

Summary of the invention:

The purpose of this invention is to provide a kind of disposable syringes of self-destroying.

The technical scheme that the present invention takes is:

A kind of disposable syringes of self-destroying, it is characterized in that: comprise needle point, cylindrical shell, push rod, packed-piston and unidirectional retaining spare, described push rod comprises the piston securement head, the piston limit groove, front axle is to limited step, the side guide groove, sliding surface, the retaining face, inclined-plane, bar body and rear axial limited step, the piston limit groove is annular groove, be positioned at the lower end of piston securement head, in the both sides of bar body, be provided with the side guide groove, sliding surface is positioned at the bottom surface of side guide groove, in the side guide groove, be provided with 1～6 retaining step, the end face of retaining step is the retaining face, the lateral surface of retaining step is inclined-plane, the retaining face is connected by inclined-plane with sliding surface, retaining facing near front axle to limited step one end, front axle is corresponding with the height of unidirectional retaining spare with the distance between nearest retaining face to limited step, in side guide groove upper end, front axle is set to limited step, axial limited step after the lower end of side guide groove arranges, unidirectional retaining spare comprises slotted collar, retaining thorn sheet and guiding ratchet sheet, the lower end lateral surface that is arranged on slotted collar of described two retainings thorn sheet symmetry, and two guiding ratchet sheets are arranged on the lower end medial surface of slotted collar, the slotted collar of unidirectional retaining spare is enclosed within on the bar body of push rod, make guiding ratchet sheet be arranged in the side guide groove, the outer end of guiding ratchet sheet contacts with sliding surface, packed-piston is enclosed within on the piston securement head, the push rod that packed-piston and unidirectional retaining spare are housed is positioned at cylindrical shell, and needle point is fixedly mounted on the liquid outlet of cylindrical shell.

Further, the quantity of retaining step is 2～6.

Further, the distance between the retaining face of each retaining step equates.

Further, the upper end in the side guide groove is provided with a retaining step, and the lower end in the side guide groove is provided with a retaining step.

Due to the present invention, the side guide groove is arranged on to the both sides of the bar body of push rod, make the lateral cross section area of bar body increase, improved the intensity of bar body, overcome and be arranged on the defect that the core bar center causes the stressed easy fracture of bar body because of the installing hole play the guiding role, such project organization not only is convenient to the direct installation of unidirectional retaining spare, mounting or dismounting facilitate simple and direct, without pushing core bar aside, and simplified the forming mould structure of push rod, improved the qualification rate of pressing, be conducive to reduce production costs.Its use function is same as the prior art.

The accompanying drawing explanation:

Fig. 1 is structural representation of the present invention;

Fig. 2 is the structural representation of push rod;

Fig. 3 is the partial enlarged drawing at the A place in Fig. 2;

Fig. 4 is the B-B cross-sectional schematic of Fig. 2;

Fig. 5 is that C in Fig. 4 is to view;

Fig. 6 is the structural representation of unidirectional retaining spare;

Fig. 7 is the left view of Fig. 6;

Fig. 8 is the top view of Fig. 6;

In figure, the 1-needle point; The 2-cylindrical shell; The 3-push rod; The 4-packed-piston; The unidirectional retaining spare of 5-; 31-piston securement head; 32-piston limit groove; The 33-front axle is to limited step; 34-side guide groove; The 35-sliding surface; 36-retaining face; The 37-inclined-plane; 38-bar body; Axial limited step after 39-; The 51-slotted collar; 52-retaining thorn sheet; 53-guiding ratchet sheet.

The specific embodiment:

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described:

Embodiment 1:

A kind of disposable syringes of self-destroying, as shown in Fig. 1～8, it is by needle point 1, cylindrical shell 2, push rod 3, packed-piston 4 and unidirectional retaining spare 5 form, described push rod 3 comprises piston securement head 31, piston limit groove 32, front axle is to limited step 33, side guide groove 34, sliding surface 35, retaining face 36, inclined-plane 37, bar body 38 and rear axial limited step 39, piston limit groove 32 is annular groove, be positioned at the lower end of piston securement head 31, in the both sides of bar body 38, be provided with side guide groove 34, sliding surface 35 is positioned at the bottom surface of side guide groove 34, in side guide groove 34, be provided with 5 retaining steps, upper end in side guide groove 34 is provided with 3 retaining steps, lower end in side guide groove 34 is provided with 2 retaining steps, the end face of retaining step is retaining face 36, the lateral surface of retaining step is inclined-plane 37, retaining face 36 is connected by inclined-plane 37 with sliding surface 35, retaining face 36 towards near front axle to limited step 33 1 ends, front axle between limit step 33 and nearest retaining face 36 apart from corresponding with the height of unidirectional retaining spare 5, in side guide groove 34 upper ends, be provided with front axle to limited step 33, axial limited step 39 after the lower end of side guide groove 34 arranges, unidirectional retaining spare 5 is comprised of slotted collar 51, retaining thorn sheet 52 and guiding ratchet sheet 53, the lower end lateral surface that is arranged on slotted collar 51 of described two retainings thorn sheet 52 symmetries, and two guiding ratchet sheets 53 are arranged on the lower end medial surface of slotted collar 51 symmetrically, the slotted collar 51 of unidirectional retaining spare 5 is enclosed within on the bar body 38 of push rod 3, guiding ratchet sheet 53 is arranged in side guide groove 34, the outer end of guiding ratchet sheet 53 contacts with sliding surface 35, packed-piston 4 is enclosed within on piston securement head 31, the push rod 3 that packed-piston 4 and unidirectional retaining spare 5 are housed is positioned at cylindrical shell 2, and needle point 1 is fixedly mounted on the liquid outlet of cylindrical shell 2.

In the above-described embodiments, the distance between the retaining face 36 of the quantity of retaining step and each retaining step can be according to the nominal nominal capacity Set arbitrarily of cylindrical shell.

Claims

1. disposable syringes of self-destroying, it is characterized in that: comprise needle point (1), cylindrical shell (2), push rod (3), packed-piston (4) and unidirectional retaining spare (5), described push rod (3) comprises piston securement head (31), piston limit groove (32), front axle is to limited step (33), side guide groove (34), sliding surface (35), retaining face (36), inclined-plane (37), bar body (38) and rear axial limited step (39), piston limit groove (32) is annular groove, be positioned at the lower end of piston securement head (31), in the both sides of bar body (38), be provided with side guide groove (34), sliding surface (35) is positioned at the bottom surface of side guide groove (34), in side guide groove (34), be provided with 1～6 retaining step, the end face of retaining step is retaining face (36), the lateral surface of retaining step is inclined-plane (37), retaining face (36) is connected by inclined-plane (37) with sliding surface (35), retaining face (36) towards near front axle to limited step (33) one ends, front axle is corresponding with the height of unidirectional retaining spare (5) with the distance between nearest retaining face (36) to limited step (33), in side guide groove (34) upper end, front axle is set to limited step (33), in the lower end of side guide groove (34), rear axial limited step (39) is set, unidirectional retaining spare (5) comprises slotted collar (51), retaining thorn sheet (52) and guiding ratchet sheet (53), the lower end lateral surface that is arranged on slotted collar (51) that described two retainings thorn sheets (52) are symmetrical, two guiding ratchet sheets (53) are arranged on the lower end medial surface of slotted collar (51), the slotted collar (51) of unidirectional retaining spare (5) is enclosed within on the bar body (38) of push rod (3), make guiding ratchet sheet (53) be arranged in side guide groove (34), the outer end of guiding ratchet sheet (53) contacts with sliding surface (35), packed-piston (4) is enclosed within on piston securement head (31), the push rod (3) that packed-piston (4) and unidirectional retaining spare (5) are housed is positioned at cylindrical shell (2), and needle point (1) is fixedly mounted on the liquid outlet of cylindrical shell (2).

2. disposable syringes of self-destroying according to claim 1, it is characterized in that: the quantity of retaining step is 2～6.

3. disposable syringes of self-destroying according to claim 1, it is characterized in that: the distance between the retaining face (36) of each retaining step equates.

4. disposable syringes of self-destroying according to claim 1, it is characterized in that: the upper end in side guide groove (34) is provided with (3) individual retaining step, and the lower end in side guide groove (34) is provided with 2 retaining steps.