WO2010135895A1

WO2010135895A1 - Retracting structure of a safety syringe

Info

Publication number: WO2010135895A1
Application number: PCT/CN2009/075580
Authority: WO
Inventors: 张淑茗
Original assignee: Chang Shu-Ming
Priority date: 2009-05-26
Filing date: 2009-12-15
Publication date: 2010-12-02
Also published as: CN101898002B; CN101898002A

Abstract

A retracting structure of a safety syringe includes a barrel (10), an upper hub (20), a lower hub (30), a push rod (40), a rotation limiting unit (50), an L-shaped locking and catching unit (60) and a rapidly guiding and braking unit. An opening end (12) is formed on one end of the inner chamber (11) of the barrel (10), the upper hub (20) is slideably restricted in the opening end (12) of the barrel (10). The lower hub (30) is closely ring packed with the upper hub (20). A break part (41) is arranged on the destined section of push rod (40) and a clamping part (45) is arranged on one end of the push rod (40). During being pushed forwardly, the clamping part (45) is hermetically embedded in the upper hub (20) or the lower hub (30). The rotation limiting unit (50) is arranged on any relative position between the barrel (10) and the upper hub (20). The L-shaped locking and catching unit (60) is arranged on any relative position between the lower hub (30) and the barrel (10). The rapidly guiding and braking unit is arranged on any relative position between the push rod (40) and the lower hub (30).

Description

Instruction manual

Title of Invention: A retracting structure for a safety syringe

Technical field

[1] The present invention relates to a safety syringe, and more particularly to a retraction structure for safely retracting an injection needle into a barrel.

Background technique

[2] Most of the syringes on the market today are traditional, including needles without any safety devices.

It can be reused, and it is easy to cause drug and blood pollution. In addition, the nakedness of the injection needle can cause stab wounds by medical staff and cleaning personnel, and deepen the epidemic of infectious diseases. In view of the problems existing in the above-mentioned conventional syringe structure, how to develop a syringe that can avoid secondary pollution caused by repeated use is eagerly awaited by consumers, and is also a goal and direction for related companies to make efforts to develop breakthroughs.

[3] In view of this, the ZL2008201079735 injection needle retracting safety syringe previously applied by the applicant is mainly characterized in that an L-shaped groove is opened at a predetermined position of the outer edge of a needle seat, wherein the L-shaped groove is an outline. a transverse groove section and a longitudinal groove section, and the L-shaped groove corresponding to the needle seat inside the cylinder body is convexly provided with a fixed bump, and the fixed convex point is matched with the guide groove group into the horizontal groove section and the longitudinal groove section of the L-shaped groove; The conventional structural type has found that the following problems still exist in the actual use experience: The conventional safety syringe is mainly composed of a single needle seat form with a cylinder and a push rod, but when applied to a replaceable needle type Injecting acupuncture, often replacing a small injection needle after the liquid is drawn, and the needle and the cylinder are caused by the radial force and the axial force generated by the rotation of the front end of the syringe during the process of changing the needle. The adhesion and the snap fit were destroyed.

Disclosure of invention

technical problem

[4]

Technical solution

[5] In view of the deficiencies in the prior art, the present invention provides a retracting structure of a safety syringe, It can effectively improve the adhesion and the fit of the needle seat and the cylinder.

[6] In order to achieve the above object, the technical solution of the present invention is:

[7] A retracting structure of a safety syringe, comprising a cylinder, an upper needle seat, a lower needle seat and a push rod; wherein an inner end of the inner chamber of the cylinder body is formed with an open end, and the upper needle seat is a sliding limit The lower needle seat is located at the open end of the cylinder, and the lower needle seat is a closed loop group on the upper needle seat. The push rod is provided with a broken portion in a predetermined section and a latching end is arranged at one end, and the front end of the push pin is a closed insert card. Positioning the lower needle seat or the upper needle seat, the upper needle seat, the lower needle seat and the push rod are axially interlocked with each other; and the relative position between the cylinder body and the upper needle seat is provided with a rotation limiting unit The limiting unit includes a limited transposition and a card slot, and a limiting piece embedded in the limiting seat stop on the card slot; the L-shaped position is located at any relative position between the lower hub and the barrel a locking unit, the L-shaped locking unit is an open portion and a limiting portion including an L-shaped groove, and a guide block that is guided to the opening portion and the limiting portion; a relative position between the push rod and the lower needle seat a quick guiding braking unit is provided, which comprises a rotating seat and a rotating slot, and the foregoing two at least three Just above staggered relatively close engagement claws and the card spin grooves, and each of the respective rotary claws and the terminal ends are provided with grooves card easy engagement of guide bevel position.

Beneficial effect

[8] The present invention is applied to a conventional needle retractable safety syringe when applied to a needle-changeable needle

, often replace the fine needle acupuncture after taking the liquid medicine, and the radial force and the axial force generated by the rotation of the front end of the syringe during the process of changing the injection needle, so that the needle seat and the cylinder body are tightly closed Improvements in the issue of the destruction of sexuality and seizure. By means of the L-shaped locking unit and the quick-guide braking unit, the rotating seat of the push rod can be quickly engaged and engaged with the rotating groove of the opposite needle seat, so that the user can carry out the next step of the push rod and the needle seat pair. Position, in the open retraction needle mode, and by the close contact of the push rod with the quick guide braking unit of the opposite needle seat, the liquid residue can be greatly reduced, thereby enabling the invention to achieve safe and environmentally friendly quality. The improvement, as well as the convenience and practical advancement of the injection needle in the use of retraction. DRAWINGS

[9] Figure 1 is an exploded perspective view of the safety syringe of the present invention;

[10] FIG. 2 is an exploded cross-sectional view showing the safety syringe of the present invention;

[11] FIG. 3 is a schematic diagram 1 of the action of the present invention, which shows a state in which the push rod is pushed in the cylinder body toward the needle seat;

[12] FIG. 4 is a schematic view 2 of the operation of the present invention, which shows a state in which the push rod is fitted to the inside of the cylinder;

[13] FIG. 5 is a schematic diagram 3 of the operation of the present invention, which shows that the push rod is not rotated; Figure 6 is a schematic view 4 of the action of the present invention, which shows the state after the pusher is rotated;

Figure ₇ is a schematic view 5 of the action of the present invention, which shows a state in which the push rod is broken after being retracted;

Figure _{8 is a} cross-sectional view showing a second embodiment of the present invention;

Figure _{9 is} an exploded perspective view of a third embodiment of the present invention;

Figure 10 is an exploded perspective view of a fourth embodiment of the present invention;

Figure 11 is an exploded cross-sectional view showing a fourth embodiment of the present invention;

Figure 12 is an exploded sectional view showing an injection needle and an upper needle holder according to a fourth embodiment of the present invention;

FIG. 13 is a first schematic diagram of the operation of the fourth embodiment of the present invention, which shows a state in which the push rod is pushed in the cylinder body toward the needle seat;

Figure 14 is a second schematic view of the operation of the fourth embodiment of the present invention, showing the state in which the push rod is fitted to the inside of the cylinder;

Figure 15 is a third schematic view of the operation of the fourth embodiment of the present invention, showing the state after the pusher is rotated; Figure 16 is a fourth operation diagram of the fourth embodiment of the present invention, showing the state of the pusher after the retraction is retracted; Figure 17 is a schematic cross-sectional view showing a combination of a fifth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the invention

The invention will now be described in conjunction with the drawings and embodiments.

The main component symbols are described below:

The cylinder 10, the chamber 11, the open end 12, the upper needle holder 20, the injection needle 21, the assembly end 22, the O-ring 23, the cassette groove 24, the lower needle holder 30, the receiving groove 31, the assembly groove 32, Through hole 33, flange 34, retaining ring 35, push rod 40, break 41, rubber plug 42, transfer end 43, extension piece 44, latch end 45, beveled edge 451, ring shoulder 45, The rotating unit 50, the limiting base 51, the locking surface 511, the limiting piece 52, the L-shaped locking unit 60, the opening portion 61, the limiting portion 62, the guiding block 63, the rotating base 70, the claw 71, and the groove 72 , guide groove 73, rotary groove 75, claw 76, grooving 77, guide surface 78, cap 80, cylinder 10A, chamber 11A, open end 12A, upper needle holder 2 OAs injection needle 21A, assembly end 22A, O-ring 23A, extending hole 24A, connecting portion 26A, lower needle holder 30A, receiving groove 31A, restricting flange 32A, open port 33A, grouping flange 34A, retaining ring 35A, check valve piece 36A, push rod 40A, break 41A, rubber plug 42A, transfer end 43A, extension piece 44A, click end 45A The extension section 46A, the rotation base 70A, the claw 71A, the catch groove 72A, the guide slope 73A, the rotation groove 75A, the claw 76A, the catch groove 77A, and the guide slope 78A.

[30] Please refer to the retracting structure of the safety syringe shown in FIGS. 1 to 7 including a cylinder 10, an upper needle holder 20, and a lower needle holder.

30 and the push rod 40, and in the embodiment, the injection needle 21 is in the form of a needle type injection needle. among them:

[31] A cylindrical body 10 is formed with an open end 12 at its front end.

[32] An upper needle holder 20 is limited to the open end 12 of the cylinder 10, and the needle needle 21 and the cap 80 are adhered to the front end of the upper needle holder 20, and the assembly end 22 of the convex ring shape is provided at the end. And the inner end of the assembly end 22 is formed with a latching groove 24, the inner end of the latching slot 24 has a through hole communicating with the injection needle 21, and the set of the connecting end 22 is provided with a 0-ring 2

3.

[33] The lower needle holder 30 is provided with a closed groove 31 of the O-ring 23 of the upper needle holder 20, and a pair of slots 32 are connected to the adjacent end of the pocket 31. The set of slots 32 are tightly nested. The assembly of the upper end of the upper needle holder 20 is such that the lower needle holder 30 can be relatively tightly closed to the upper needle holder 20, so that the liquid medicine does not remain in the assembly groove 32, and the group of slots 32 is adjacent. The through hole 33 and the flange 34 on the outer side of the through hole 33 are provided on the side, and the outer edge of the lower needle holder 30 is sleeved with a retaining ring 35 for sealingly guiding the sliding body 10 .

[34] A predetermined portion of the outer rim of the push rod 40 is provided with a rubber plug 42 for sealing and guiding the sliding body 10, and the rod portion of the push rod 40 is hollow (or ribbed). The push rod 40 is not subjected to torsional deformation during the ring rotation process, and can achieve a true rotation condition, and the rear end surface of the push rod 40 is provided with a transfer end 43 of a larger piece shape, and the transfer end 43 is offset adjacent to the side. The extension piece 44 having the same body shape can increase the hand-held rotation area by the two side edges of the transfer end 43 and the extension piece 44, so as to facilitate the user to conveniently adjust the rotation of the push rod 40, and the pair of push rods 40 The through hole 33 of the lower needle holder 30 should be convexly provided with a latching end 45 for providing a through hole, wherein the outer end surface of the latching end ₄₅ has a beveled edge ₄₅ L. When the push rod _{40 is} pushed forward, the click end _{45 is} utilized. inclined tapered surface can be smoothly introduced into the packing through-hole 33 the hub 30, and the other end engaging end 45 is formed with a ring shoulder 452, when the engaging end ₄₅ into the through hole ₃₃ is further obtained that the ring shoulder ₄₅₂ The gear stops at the flange _{34 of the} lower needle holder ₃₀ , and further, the push rod 40, the lower needle holder 30 and the upper needle holder 20 are axially interlocked with each other.

[35] The main features of the invention are:

[36] The relative position between the cylinder 10 and the upper needle holder 20 is provided with a rotation limiting unit 50, and the rotation limiting unit 50 includes a 限-shaped limiting seat 51 and can be inserted into the limiting seat 51. In the embodiment, the limiting piece 51 is annularly disposed on the outer wall surface of the upper needle holder 20, and the limiting seat 51 is provided with a closing card at the rear end. The limiting surface 52 is annularly disposed on the inner ring wall surface at the open end 12 of the cylindrical body 10, and the respective limiting seats 51 of the upper needle holder 20 are advanced toward the open end 12 of the cylindrical body 10, Each of the limiting seats 51 can be inserted into the respective limiting pieces 52 of the cylinder 10 one by one, so that the upper needle holder 20 and the cylinder 10 can be interlocked, and the shaft between the upper needle holder 20 and the cylinder 10 To the limit.

[37] Then, the L-shaped latch unit 60 is provided at a position opposite to the lower hub 30 and the barrel 10, and the L-shaped latch unit 60 is an open portion 61 including a longitudinal axis direction of the L slot and a transverse direction The limiting portion 62 and the convex guiding block 63 which can be guided to the opening portion 61 and the limiting portion 62; wherein the vertical axis opening portion 61 and the horizontal diameter limiting portion 62 of the L groove shape are groove-shaped The guide block 63 of the opposite opening portion 61 and the limiting portion 62 protrudes from the inner wall of the cylindrical body 10 relative to the lower needle holder 30, thereby being disposed at a predetermined position on the outer ring wall surface of the lower needle holder 30. The guide block 63 is guided to slide through the open end of the longitudinal opening portion 61 of the lower needle holder 30. After the guide block 63 is slid to the bottom edge of the opening portion 61, the guide block 63 is further rotated to the limit portion 62 to the bottom limit. The guiding block 63 is axially restricted to the limiting portion 62 of the lower needle holder 30 together with the cylindrical body 10, that is, the lower needle holder 30 is axially limited to the inside of the cylindrical body 10, thereby enabling the lower needle holder 30. The upper needle holder 20 is stably locked to the open end 12 of the cylinder 10. When the lower needle holder 30 is rotated toward the open portion 61 of the L-shaped latch unit 60, the guide block 63 inside the cylindrical body 10 is rotatably aligned to the open portion 61 of the lower needle holder 30, so that the injection of the upper needle holder 20 is performed. The needle 21 is retracted to the inside of the barrel 10 along with the lower needle holder 30 at the open end 12 of the barrel 10.

[38] The relative position between the push rod 40 and the lower needle holder 30 is provided with a quick guiding braking unit, and the quick guiding braking unit is a rotating base 70 and a rotating slot 75 including easy-to-alignment engagement, wherein The rotating slot 75 is disposed inside the end of the lower hub 30 in this embodiment, and the rotating base 70 is disposed at a relative position of the push rod 40 corresponding to the rotating slot 75. The foregoing two at least four groups are relatively close together. The staggered engaging claws 76, 71 and the catching grooves 71, 72, and the ends of the four claws 76, 71 and the four card grooves 77, 72 are respectively provided with guiding surfaces 78, 73 for easy meshing alignment, Quickly guiding the relative meshing position and interlocking the two, and by the tight engagement of the rotating base 70 of the push rod 40 with the rotating groove 75 of the lower needle holder 30, the gap between the two can be eliminated and the gap can be reduced. The liquid medicine remains, so that the internal liquid medicine pushed forward by the push rod 40 to the cylinder body 10 can be almost completely injected, so that the injection is completed quickly, and the rotary seat 70 of the push rod 40 is automatically smoothly guided into the rotation groove 75 of the lower needle holder 30. In addition, the rotating base 70 and the rotating slot 75 of the quick guiding braking unit are positive and negative in this embodiment. Rotation interlocking engagement form, the main configuration of the embodiment is rotary pawls 76, 71, the card grooves 77, 72 and the guide ramp 78, 73 mutually symmetrical layout pattern in a continuous ring. [39] With the above structure and composition design, please refer to Figs. 3 to 7 for the operation of the present invention.

[40] When the user is using the syringe, the upper needle holder 20 is preliminarily limited to the open end 12 of the cylinder 10, and the lower needle holder 30 is located in the cylinder by the L-shaped locking unit 60. 10 is stopped at the rear end of the upper needle holder 20, and when the push rod 40 is in the injection advancement, the tapered flange 451 of the latching end 45 of the push rod 40 is a through hole 33 that is forced into the lower needle holder 30, After the latching end 45 enters the through hole 33, the latching end 45 is in full contact with the latching slot 24 of the upper needle hub 20 to reduce the residual of the liquid medicine, and the latching end 45 enters the through hole 33. The ring shoulder portion 452 is located at the flange 34 of the lower needle holder 30 so that the push rod 40 and the lower needle holder 30 are in an axially interlocking state, and the rotating seat 70 of the push rod 40 is intended to be engaged with The rotation groove 75 of the lower needle holder 30, if the claw 71 of the rotary base 70 and the groove 77 of the rotary groove 75 are not correctly aligned, the guide inclined surface 73 of the claw 71 of the rotary base 70 and the rotary groove 7 5 The guide bevels 78 of the claws 76 are guided by the fast beveling function of each other, so that the claws 76, 71 of the two can be automatically rotated and introduced into the grooves 77, 7 of the interlaced engagement. 2 positions, so as to facilitate the user to engage in the alignment without the need for the alignment, and the rotating base 70 of the push rod 40 is the rotation groove 75 that is tightly engaged with the lower needle holder 30, and the assembly end 22 of the upper needle holder 20 is The clamping ring 32 is tightly received in the clamping groove 32 of the lower needle holder 30, and the latching end 45 of the push rod 40 is tightly received in the latching groove 24 of the upper needle holder 20, so that the push rod 40 can completely inject the liquid medicine. Outside.

[41] Please refer to FIG. 5~6. When the injection needle 21 is to be retracted into the barrel 10 after injection, the push rod 40 needs to be manually rotated, so that the hand is held at the rear end of the push rod 40. 43 and the extending piece 44 rotates, and the rotating seat 70 of the rotating rod 70 can be quickly aligned and tightly engaged with the rotating groove 75 of the lower needle holder 30 by obliquely pushing the inclined taper surfaces of the rotating base 70 and the rotating groove 75. When the two are tightly engaged, the plurality of claws 71 of the rotating base 70 are interlaced and inserted into the plurality of slots 77 of the rotating slot 75, and the plurality of slots 72 of the rotating bases 70 are engaged with the rotation of the rotating slots 75. The claws 76, the ends of the plurality of claws 76, 71 and the guide grooves 78, 73 formed between the ends of the plurality of claws 76, 71 are also in close contact with each other, thereby reducing the residual liquid medicine, so that the push rod 40 can be By rotating the external force, the lower needle holder 30 is rotated in synchronization, and after the external force is rotated, the guide block 63 of the cylindrical body 10 is converted from the limiting portion 62 originally located at the lower needle holder 30 to the lower needle holder 30. The opening portion 61, and the user can further retract the push rod 40 so that the ring shoulder portion 452 of the click end 45 of the push rod 40 stops at the flange 34 of the lower needle holder 30, And the assembly groove 22 of the lower needle holder 30 is annularly engaged with the assembly end 22 of the upper needle holder 20, and then the displacement is reduced. After the fracture portion 41 of the push rod 40 is retracted and exposed outside the cylinder 10, the force is applied. Breaking the break 41 (as shown in Fig. 7), the pusher 40 is cut into two segments, and then the needle 21 adhered to the lower needle holder 30 and the upper needle holder 20 is retained. For safety purposes within the barrel 10.

[42] In addition, the push rod 40 and the lower needle holder 30 are in meshing engagement position, and the lower needle holder 30 is easily rotated by guiding the guiding surfaces 78 and 73 of the braking unit quickly, because the upper needle holder 20 and the barrel The relative position of the body 10 is provided with a rotation limiting unit 50, and the combination groove 22 of the upper needle holder 20 and the lower needle holder 30 are in a ring-shaped card configuration, so that the lower needle holder 30 is only The ringing action can be generated relative to the upper needle holder 20 to prevent the user from injecting the push rod 40 into the near bottom limit. The rotating base 70 of the push rod 40 can be guided by the guiding inclined surface 73 to make the push rod The rotating base 70 of the 40 is rotationally engaged with the rotating groove 75 of the lower needle holder 30. When the lower needle holder 30 is rotated and aligned, the lower needle holder 30 also easily moves the upper needle holder 20 and the injection needle 21 to rotate, thereby facilitating the injection. The needle 21 injects a rotating accident in the human body, so that the problem can be effectively solved by the design of the limiting unit 50 between the upper needle holder 20 and the barrel 10.

[43] Thereby, the L-shaped locking unit 60 and the quick-guide braking unit can enable the rotating base 70 of the push rod 40 to be quickly engaged and engaged with the rotating groove 75 of the opposite needle seat, which is convenient to use. The next step of turning the push rod 40 and the needle seat alignment is to open the retracting injection needle 21 mode, and by the close contact of the push rod 40 with the quick guide braking unit of the opposite needle seat, The liquid residue is greatly reduced, so that the present invention can achieve safety and environmental quality improvement, and the convenience and practical progress of the injection needle 21 in retracting use. In addition, the limiting seat 51 of the limiting unit 50 can also be disposed at the inner wall edge of the open end 12 of the cylinder 10, and the limiting piece 52 can also be disposed on the outer wall edge of the upper needle holder 20 and Relative to the position of the limiter 51 of the cylinder 10.

Referring to FIG. 8, which is a second embodiment of the present invention, the L-shaped slot of the L-shaped latch unit 60 disposed between the lower needle hub 30 and the barrel 10 of the needle syringe is The position portion 62 and the opening portion 61 may be disposed on the inner wall of the open end 12 of the cylindrical body 10, and the open groove end of the open portion 61 may be located at the end of the cylindrical body 10, and the guide block 63 may be disposed on the lower needle holder 30. The outer wall surface of the lower needle holder 30 can be inserted into the bottom edge of the opening portion 61 of the L-shaped latch unit ₆₀ , and then rotated in the direction of the limiting portion 62 to the bottom limit to be in the axial position. The purpose of the lower needle holder 30 and the upper needle holder 20 being axially limited to the open end 12 of the barrel 10 can be achieved.

[45] Referring to FIG. 9, which is a third embodiment of the present invention, the rotary seat 70A and the rotary groove 75A form of the quick-guide braking unit provided between the push rod 40 and the lower needle holder 30 The unidirectional loop can be engaged in the forward or reverse direction, and the rotary seat 70A and the rotary slot 75 A are positive or reverse unidirectional loops to guide the meshing alignment. For each of the rotation claws 70A and the rotation grooves 75A, the claws 76A, 71A, the card The grooves 77A, 72A and the inclined surfaces 78A, 73A are arranged in a continuous loop in an asymmetrical pattern.

[46] Referring to FIGS. 10-16, the present invention may also be a fourth embodiment of a needle changeable syringe type, wherein the inner wall of the front end of the upper needle holder 20A is provided for combining needle-changeable injection. The connecting portion 26A of the needle 21A and the connecting portion 26A are provided with an elongated extending hole 24A in a tubular shape, wherein the inner edge of the connecting portion 26A is formed with an internal thread portion for the connecting end 211A of the needle-changeable needle 21A. Screwed into the joint portion 26A of the upper needle holder 20A, and the outer annular surface of the elongated extending hole 24A is also combined for the pressing force of the needle-changeable needle 21A, and the lower needle holder 30A is opposed to the extending hole The inner edge of the 24A is provided with a tilting resilient check valve piece 36A. The check valve piece 36A is provided with a limiting flange 32A corresponding to the upper needle seat 20A end, and an open port 33A is provided at the other end. The upper needle holder 20A is provided with a connecting end 22A opposite to the outer edge of the card holder 30A, and the lower needle holder 30A is provided with a connecting edge 34A with respect to the inner edge of the set of the connecting end 22A. The assembly end 22A of the upper needle holder 20A is provided with an O-ring 23A, and the outer wall of the upper needle holder 20A is opposite to the cylinder. The inner wall of the 10A is provided with a limiting unit 50, wherein the limiting base 51 of the limiting unit 50 is disposed on the outer wall of the upper needle holder 20A, and the inner edge of the open end 12A of the cylinder 10A corresponds to the upper seat. The limiter seat of the 20A is provided with a limiting piece 52. The needle-changing needle of the embodiment is mainly used with the L-shaped locking unit 60 by the limiting unit 50, which can effectively prevent the syringe from being improperly operated by the user. The damage, such as: the snap-in and the sealing damage, and the needle-injectable needle 21 is required to be injected into the body 10A after the liquid medicine is sucked into the cylinder 10A, by the rotation-restricting unit 50 It is possible to prevent the sealing force and the clamping force of the syringe from being damaged by the radial and axial forces generated by the rotation of the needle 21 拆卸.

[47] In the above, the lower needle holder 30A is provided with a recess 31A of the O-ring 23A, and the rotation groove 75 is connected to the adjacent side of the pocket 31A, and the lower needle holder 30A is connected to the upper needle holder 20A. an outer wall surface of the cylindrical body 10A equipped with opposing L-shaped latch means _60, wherein the L-shaped slot open portion of the L-shaped latch means 60 and the stopper portion 61 of the outer ring 62 is laid under the edge of the wall surface 30A of the hub, and The guide block 63 is disposed on the inner ring edge wall surface of the L-shaped latch unit 60, and the push rod 40A is provided with a rotating base 70, an extended section 46A and a ring corresponding to the lower needle seat 30A-end. shoulder ₄₅ a, 40A when advancing the pusher into the group at the hub 30A and 20A inch needle hub, which engages the rotating base 70 is closed at the hub 30A of the rotary drum 75, and the push rod 40A of the elongated The segment 46A is sleeved in the extending hole 24A of the upper needle holder 2 OA, and the annular shoulder portion 45A has a tapered tapered edge to smoothly pass through the open port 33A of the resilient check valve piece 36A, and the stop limit is located at another The limiting flange 34A of the end allows the extension section 46A to smoothly enter the extending hole 24A, and then the ring shoulder 45A is engaged with the limiting edge 32A of the outer end of the extending hole 24A, and the quick guiding system The moving unit is disposed at a relative position of the push rod 40A-end and the lower needle holder 30A, wherein the quick-guide braking unit includes a rotating base 70 disposed at the front end of the push rod 40A, and a rotation provided at the lower needle holder 30A. The groove 75, the two are included with four sets of relatively closely interlaced claws 76, 71 and the grooves 77, 72, and each end of each of the four claws 76, 71 and the four card grooves 77, 72 is respectively provided. Easy to engage the alignment guides 78, 73 for quickly guiding the relative engagement positions and interlocking the two, and by the rotation seat 70 of the push rod 40A and the rotation groove 75 of the lower needle holder 30A In the present embodiment, the rotating base 70 and the rotating slot 75 of the quick-guide braking unit are in a positive and reverse two-way loop-engagement engagement configuration, and the main configuration thereof is the claws 71, 71, The patterns in which the card grooves 77, 72 and the guide slopes 78, 73 are symmetrical with each other are arranged in a continuous loop.

Referring to FIG. 17, which is a fifth embodiment of the present invention, wherein the L-shaped latch unit 60 of the needle holder 30A and the barrel 10A are disposed opposite each other. The slot limiting portion 62 and the opening portion 61 may be disposed on the inner wall of the open end 12A of the tubular body 10A, and the open slot end of the open portion 61 is located at the end of the cylindrical body 10A, and the guide block 63 may be disposed on the lower needle. The outer wall surface of the seat 30A can be accessed by the guide block 63 of the lower needle holder 30A into the bottom edge of the opening portion 61 of the L-shaped latch unit 60, and then rotated in the direction of the limiting portion 62 to the bottom limit to be in the axial position. The purpose of the lower needle holder 30A and the upper needle holder 20A in the axial direction is limited to the open end 12A of the cylinder 10A.

Industrial applicability

[49]

Sequence table free content

[50]

Claims

Claim

[Claim 1] A retracting structure of a safety syringe, comprising a cylinder, an upper needle seat, a lower needle seat and a push rod; wherein an inner end of the inner chamber of the cylinder body is formed with an open end, and the upper needle seat is slid The lower needle seat is located at the open end of the cylinder body, and the lower needle seat is a closed loop group formed on the upper needle seat. The push rod is provided with a broken portion in a predetermined section and a latching end is arranged at one end, and the front end of the push pin is tightly embedded. The card is positioned in the lower needle seat or the upper needle seat, so that the upper needle seat, the lower needle seat and the push rod are axially interlocked with each other; the feature is: any relative between the barrel and the upper needle seat The position is provided with a limit-rotating unit, wherein the limit-turning unit comprises a limited transposition and a card slot, and a limit-rotating piece embedded in the limit-rotation block to terminate in the card slot; any relative between the lower hub and the barrel The L-shaped locking unit is provided with an L-shaped open portion and a limiting portion, and a guide block that is guided to the opening portion and the limiting portion; the push rod and the lower needle seat a relative guiding position is provided with a quick guiding braking unit, which comprises a rotating seat and a rotating slot, the foregoing Among those containing at least three or more sets just staggered relatively tight engagement claws and the card spin grooves, and each of the respective rotary claws and the terminal ends are provided with grooves card easy engagement of guide bevel position.

[Claim 2] The retracting structure of the safety syringe according to claim 1, wherein: the connection structure of the rotation limiting unit, the L-shaped locking unit and the quick guiding braking unit can be used for the needle Injection needle structure.

[Claim 3] The retracting structure of the safety syringe according to claim 1, wherein: the connection structure of the rotation limiting unit, the L-shaped locking unit and the quick guiding braking unit can be used for exchangeable Needle needle structure.

[Claim 4] The retracting structure of the safety syringe according to claim 1, wherein: the rotation limiting unit is configured to provide a rotation regulating piece at a position close to the open end of the inner wall of the cylindrical body, and the upper needle The outer wall surface of the seat is provided with a limit rotation seat for providing a limit and a limit rotation relative to the limit rotation piece.

[Claim 5] The retracting structure of the safety syringe according to claim 1, wherein: the rotation limiting unit is configured to provide a rotation restricting seat near the open end of the inner wall of the cylinder, and the outer wall surface of the upper needle seat The relative limiter is provided with a limiter that provides limit and limit rotation.

[Claim 6] The retracting structure of the safety syringe according to claim 1, wherein: the predetermined position of the outer wall surface of the lower needle seat is an open portion and a limiting portion provided with an L-shaped groove, and the inner wall of the cylinder The open portion and the limit portion corresponding to the L-groove are provided with guide blocks for guiding the slide.

[Claim 7] The retracting structure of a safety syringe according to claim 1, wherein: the predetermined position of the outer wall surface of the lower needle seat is a guide block, and the inner wall of the cylinder corresponds to the lower needle seat. The guide block may be provided with an L-slot open portion and a limit portion that provide a guide to the inside.

[Claim S] The retracting structure of a safety syringe according to claim 1, wherein the rotary seat and the rotary groove of the quick guide brake unit are positively and reversely coupled with each other.

[Claim 9] The retracting structure of a safety syringe according to claim 1, wherein: the rotating seat and the rotating groove of the quick guiding braking unit are mutually positive or only reverse unidirectional rings The steering guide engages the alignment.