WO2012167604A1 - Safe self-destructive syringe - Google Patents

Abstract

A safe self-destructive syringe, characterized in that: the syringe comprises a barrel (1), a plunger rod (2), an internal needle seat body (21) disposed in the barrel neck (4) of the barrel (1), the internal needle seat body (21) being an integrally single-body structure, and the internal needle seat body (21) being disposed with an elastic sealing position-limiting base (7). The surface of the elastic sealing position-limiting base (7) is provided with an annular buffer gap (9). An annular sealing position-limiting engagement portion (10) is formed at the outer wall of the elastic sealing position-limiting base (7) outside of the annular buffer gap (9). The end of the plunger rod (2) is provided with a metal hook (11). The syringe uses a single body internal needle seat structure, such that the internally set annular buffer gap (9) enables the internal needle seat body (21) to have a certain stretching and deformation property, thereby achieving stable, complementary lock with the barrel neck (4). At the same time, a buffer zone reduces the pullback force needed to withdraw the internal needle seat, so that the locking force and the pullback force are balanced. The syringe achieves the effects of stable lock and seal without being influenced by the external environment. The syringe final product is relatively pragmatic, easy to operate, requires relatively weak pullback force, and has a stable overall operation state.

Description

 Description

 Safe self-destructing syringe

Technical field

 The present invention relates to the technical field of medical devices, and more particularly to a safe self-destructing injector, and more particularly to a mechanical connection structure thereof.

Background technique

 Comparative document 1, patent number: ZL200410017938. 0, application date: 2004. 04. 26, bulletin number: CN1689654, patentee: Shanghai Dingjiantang Biochemical Technology Co., Ltd., the case publicly disclosed "a damaged safety syringe", The utility model comprises: a jacket, a neck and a needle at an upper end of the jacket, and a core rod in the outer sleeve, wherein: the inner end of the cylinder neck is provided with a convex edge, the inner cavity of the cylinder neck is provided with a needle seat, and the inner wall of the needle seat is a cylindrical hole The outer wall of the needle seat is provided with an annular convex rib and is closely attached to the convex edge of the top end of the inner cavity of the cylinder neck. The needle is placed between the inner and outer walls of the needle seat, and the inner end of the core rod is provided with an inner hole, one end of the barb Placed in the inner hole, the upper part of the core rod is provided with a mounting groove, and a sealing ring is built therein. The middle part of the core rod is set as a six-piece body, a guiding groove is arranged between the sheet bodies, and a positioning piece is embedded in the bottom of the outer casing. Guided in the slot.

 Comparative Document 2, Patent No.: ZL200720067715. 4, Application Date: 2007. 03. 08, Announcement No.: CN201076648, Patentee: Shanghai Dingjiantang Biochemical Technology Co., Ltd., this case discloses "a metal hook structure The core rod includes: a core rod body, a columnar fastener is disposed at an upper end portion of the core rod body, and a rubber plug is sleeved at the columnar fastener member, wherein: the rubber plug is provided with a mounting hole, and the mounting hole is provided with a pouring Hook body.

Comparison Document 3, Patent No.: ZL 200720075476. 7 , Application Date: 2007. 10. 16, Announcement No.: CN201101783, Patentee: Shanghai Top Tang Biochemical Technology Co., Ltd. The present invention discloses a "safety self-destructing syringe", comprising: a cylinder body, the end of the cylinder body is a cylinder neck, a needle seat is arranged in the cylinder neck, a needle tube is arranged in the needle seat body, and a core rod is arranged in the cylinder body cavity, The end of the core rod is provided with a rubber plug, wherein: the top end of the core rod is provided with a mounting hole, and the mounting hole is provided with an s-shaped pull-back hook, and the S-shaped pull-back hook is composed of an upper hook body and a lower hook body, and the lower body body Placed in the mounting hole, the lower hook body is V-shaped, and one side arm of the lower hook body is vertical, and is parallel with the inner wall of the mounting hole and closely adheres to the inner wall of the mounting hole, and the upper hook body is inverted V-shaped, and the upper hook body is The side arm and the one side arm of the lower hook body are at an angle of less than 180 degrees and greater than 90 degrees, and the upper hook body is inverted V-shaped, and the maximum width between the arms is larger than the inner diameter of the inner cavity of the needle seat, and the lower hook body In a V shape, the maximum width between the arms is greater than the width of the lumen of the mounting hole. Comparative Document 4, Patent No.: ZL200720075475. 2, Application Date: 2007. 10. 16, Announcement No.: CN201101782, Patentee: Shanghai Top Tang Biochemical Technology Co., Ltd., this case discloses "a safe self-destructive vaccine syringe" The utility model comprises: a cylinder body, a core rod is arranged in the cylinder body, a rubber plug is arranged near the end of the core rod, a needle is arranged in the cylinder neck of the cylinder body, and a needle tube is arranged at the needle head, wherein: the core rod end portion The side wall of the rod body is provided with a lateral notch, the transverse notch is connected with the longitudinal notch at the end of the mandrel rod, the transverse notch is matched with the longitudinal notch, and the needle is sleeved by the upper needle seat and the lower needle seat, and the lower needle seat is sleeved The cavity is hollow, the lower needle seat has a cylindrical structure, and the lower needle seat is provided with a lower needle seat rib relative to the inner wall of the opening at the other end of the needle seat.

Comparative document V, patent application number: ZL200910048684. 1, application date: 2009. 04. 01, announcement number: CN101850141A, patentee: Jiangsu Yile Medical Products Co., Ltd., this case discloses "a safe syringe", including: The cylinder body is provided with a core rod, a rubber plug is sleeved at the core rod, and a needle seat is arranged in the cylinder neck of the cylinder body, and the needle seat end portion is provided The utility model has a needle tube, wherein: the core rod end is provided with a safety pull-back lock cylinder body, and the outer wall of the safety return lock cylinder body is provided with an upper limit locking ring and a lower limit locking ring from top to bottom, the cylinder body The upper end of the cylinder neck is provided with a top safe pull-back needle seat and a lower safety pull-back base from top to bottom, and the upper safe pull-back needle seat and the lower safety pull-back base are annular, and the safety pull-back lock cylinder can penetrate The center of the safety pull back needle seat and the lower safety pull back base.

The above-mentioned comparative documents disclose several typical needle-seat pull-back safety syringes or safety self-destructing syringes. The basic design principle is to utilize the pull-back parts provided at the ends of the core rods and the needle holders in the syringe to be partially engaged. The pull-back force of the core rod pulls the needle head back to the inner body of the syringe barrel for safe or safe self-destruction. The pull-back member of the end of the core rod generally adopts two forms, one of which is a metal barb, and the partial locking of the barb body and the inner needle seat is realized by utilizing the elastic property of the metal piece, and the second is a column pull-back piece. Generally, a protruding snap-locking structure is arranged on the outer surface of the column, and cooperates with the inner structure of the inner needle seat to realize partial locking with the inner needle seat. The original design of such an inner needle back pull-type safety or safety self-destructing syringe is to adopt a single inner needle seat structure, but in actual tests, it is found that when the inner needle seat and the cylinder neck meet the standard of engagement The pullback force required for the inner needle seat to be pumped back is large, which makes the syringe unable to achieve safe operation. When the required pullback force of the inner needle seat reaches the desired value, the inner needle seat and the neck of the cylinder barrel are engaged. And the sealing effect is not ideal. Due to the defects in the structure of the existing needle holder and the characteristics of the material itself, the balance between the clamping force and the pulling back force cannot always be achieved. Based on the above reasons, developed a split type double needle seat pull-back safety or safety self-destruction The syringe is generally designed with an upper and lower double needle seat structure, the upper needle seat realizes the engagement function with the neck of the syringe barrel, the lower needle seat realizes the engagement function with the pullback member, the upper needle seat and the lower needle The seats are connected by a nip.

 There are many problems in the actual production and use of the split inner needle seat. First, the upper and lower needle holders have higher mold cost, and the mold opening process is more complicated, and often cannot be demoulded once, and second demoulding is required. Second, In the assembly process, the upper and lower split type needle holders are prone to assembly errors, resulting in product scrapping, and at the same time, the assembly difficulty is increased. Thirdly, the upper and lower split type needle holders are prone to operation failure, and the working state of the syringe is stable. Poor. In summary, there is still a need to further improve the structure of the existing needle-seat pull-back safety or safety self-destructing syringe, and to develop a single-body inner needle seat capable of simultaneously satisfying the clamping force and the pull-back force and having the sealing effect. structure. Summary of the invention

 The object of the present invention is to provide a safe self-destructing syringe which adopts a single inner needle seat structure, and the inner needle seat portion forms a buffer zone with elastic expansion and contraction function, which overcomes the defects caused by the material itself, and the elastic buffer zone. It can ensure the bite force and tightness between the inner needle seat and the neck, and reduce the pulling force required for the inner needle seat to pull back when the inner needle seat is pulled back, so that the two key elements of contradiction achieve an optimal balance. Point, with "0"-shaped sealing rubber ring can ensure the complete sealing effect of the inner needle seat and the neck of the syringe barrel. This one-piece inner needle seat can be demoulded at one time, and the working state is stable, which can realize one-hand operation and overcome the present There are shortcomings and deficiencies in the technology.

In order to achieve the above object, the technical solution of the present invention is: a safe self-destructive injection The utility model comprises a cylinder body, a core rod is arranged in the cylinder body, a rubber plug is sleeved at the core rod, an inner needle seat body is arranged in the cylinder neck of the cylinder body, and a pull-back locking cavity is opened at a lower end of the inner needle seat body, the inner needle The end of the seat body is provided with a needle tube, wherein: the inner needle seat body is provided with a needle tube base, and an elastic sealing limit base integrally formed with the needle tube base, and the two are integrated into one body. The structure, the needle base and the elastic sealing limit base form an annular step or an annular slope surface, the elastic sealing limit base surface is provided with an annular buffer gap, and the elastic sealing limit base outside the annular buffer gap An annular seal limit engagement portion is formed at the outer wall, and a metal barb body is disposed at the end of the core rod.

 The utility model relates to a safe self-destructing syringe, which comprises a cylinder body, a core rod is arranged in the cylinder body, a rubber plug is sleeved at the core rod, and an inner needle seat body is arranged in the cylinder neck of the cylinder body, and the lower end of the inner needle seat body is provided with a back Pulling the locking cavity, the end of the inner needle seat body is provided with a needle tube, wherein: the inner needle seat body is provided with a needle tube base, and an elastic sealing limit base formed integrally with the needle tube base, two The component assembly structure has an annular step or an annular slope between the base of the needle tube and the elastic sealing limit base, and an annular buffer gap is formed on the surface of the elastic sealing limit base, and an elastic seal on the outer side of the annular buffer gap An annular seal limit engagement portion is formed on the outer wall of the limit base, and a metal barb body is arranged at the end of the core rod.

The invention discloses a safe self-destructing syringe. The syringe adopts a single-type inner needle seat structure, and the overall structure design is reasonable. The concept of the buffer part is very clever, and the built-in buffer gap makes the inner needle seat have certain telescopic deformation characteristics, and The neck and neck cooperate to achieve a stable clamping effect. At the same time, the buffer can reduce the required pull-back force when the needle seat is pulled back, so that the clamping force and the pull-back force are perfectly balanced. The inner needle seat can be injection molded at one time, effectively reducing the thickness. Manufacturing costs, simplifying manufacturing processes, and achieving stable syringes The card position and sealing effect are not affected by the external environment. The finished syringe is easy to operate in actual use, requires less pull-back force, and has stable overall working condition, and has good practicability. Compared with the prior art, It has outstanding substantive features and significant progress.

DRAWINGS

 Fig. 1 is a view showing an initial state of a first embodiment of the present invention.

 Fig. 2 is a view showing the state of use of the first embodiment of the present invention.

 Fig. 3 is a diagram showing the safety self-destruction of the first embodiment of the present invention.

 Figure 4 is a diagram showing an initial state of a second embodiment of the present invention.

 Figure 5 is a diagram showing the state of use of the second embodiment of the present invention.

 Figure 6 is a diagram showing the safety self-destruction of the second embodiment of the present invention.

 Figure 7 is a schematic view showing the structure of the inner needle seat body in the first embodiment of the present invention.

 Figure 8 is a schematic view showing the structure of the inner needle seat body in the second embodiment of the present invention.

 Figure 9 is a schematic view showing the structure of the cylinder of the present invention.

 Figure 10 is a schematic view showing the structure of the core rod of the present invention.

detailed description

 The invention will now be further described with reference to the accompanying drawings.

The invention is a safe self-destructing syringe, as shown in FIG. 1 , which is a schematic structural view of a first embodiment of the present invention, which mainly comprises a cylinder 1 , and a core rod 2 is arranged in the cylinder body 1 , and the core rod 2 is sleeved A rubber plug 3 is connected, and an inner needle seat body 21 is disposed in the cylinder neck 4 of the cylinder body 1. The lower end of the inner needle seat body 21 is provided with a pull-back locking cavity 5, and the end of the inner needle seat body 21 is provided with a needle tube 12, The utility model is characterized in that: the inner needle seat body 21 is provided with a needle base 6 and a needle base 6 The elastic sealing limit base 7 is formed as an integral structure, and the two are integrated into a single structure, and an annular step 8 or an annular slope is formed between the needle base 6 and the elastic sealing limit base 7 . The "O"-shaped sealing rubber ring 14 is sleeved at the step 8 ("O"-shaped sealing rubber ring 14 can cooperate with the inner wall of the cylinder neck to achieve a sealing effect, effectively preventing leakage of the front end of the syringe), and the elastic sealing limit base 7 is provided with an annular buffer gap 9 on the outer surface of the elastic sealing limit base 7 on the outer side of the annular buffer gap 9 to form an annular sealing limit engaging portion 10, and a metal barb body 11 is arranged at the end of the core rod 2.

 The safe self-destructing syringe of the present invention may have another split structure, which comprises a cylinder 1 in which a core rod 2 is arranged, and a plug 3 is sleeved at the core rod 2, and the barrel 1 is The inner neck seat body 21 is provided with an inner needle seat body 21, and the lower end of the inner needle seat body 21 is provided with a pull-back locking cavity 5, and the end of the inner needle seat body 21 is provided with a needle tube 12, wherein: the inner needle seat body 21 is provided with a needle base 6 and an elastic sealing limit base 7 integrally formed with the needle base 6, and the two components are assembled, and the needle base 6 and the elastic sealing limit base 7 are formed. An annular step 8 or an annular slope surface, the annular step 8 is sleeved with a "0"-shaped sealing rubber ring 14 ("O"-shaped sealing rubber ring 14 can cooperate with the inner wall of the cylinder neck to achieve a sealing effect, effective The end of the elastic sealing limit base 7 is provided with an annular buffer gap 9 , and the outer wall of the elastic sealing limit base 7 outside the annular buffer gap 9 forms an annular sealing limit engaging portion 10 . The surface of the annular seal limiting engagement portion 10 is curved to facilitate guiding. 2 is provided with a metal end of the rod member 11 barbs.

In a specific implementation, the height of the annular buffer gap 9 from the slot to the bottom of the groove is 0.1 mm-20 mm, the width of the annular buffer gap 9 is 0.1 mm-20 mm, and the annular buffer gap 9 outer groove wall and annular seal The distance between the arc top of the surface of the limit engaging portion 10 is 0.1mm-20mm, the distance between the outer groove wall slot of the annular buffer gap 9 and the outer wall of the annular seal limit engagement portion 10 is 0.1mm-20mm, and the annular buffer gap 9 is at the bottom of the groove wall and the ring The distance between the outer walls of the seal-like engagement portion 10 is 0.1 mm to 20 mm.

 In a specific implementation, the surface of the annular seal limiting engaging portion 10 is curved, and the distance from the top of the arc to the edge of the curved surface is smaller than the distance from the top of the arc to the lower edge of the curved surface. The neck is pulled out.

 In an embodiment, an annular recess 13 is formed at an outer wall of the elastic sealing limit base 7 at the lower portion of the annular seal limiting engaging portion 10, and the annular recess 13 is at the same level as the groove bottom of the annular buffer gap 9 or The bottom of the groove is higher than the annular buffer gap 9.

 In an embodiment, the upper surface of the elastic sealing limit base 7 is provided with an annular buffer gap 9.

 In a specific implementation, the lower surface of the elastic sealing limit base 7 is provided with an annular buffer gap 9.

 In a specific implementation, as shown in FIG. 7, the needle base 6 is in the shape of a cylinder, and the elastic sealing limit base 7 is disposed at the bottom of the needle base 6, and the two form an integrated single structure or a split type. Assembly structure.

 In a specific implementation, the needle base 6 is in the shape of a cylinder, and the elastic sealing limit base 7 is disposed at the middle portion of the cylinder base 6 column, and the two form an integral single structure or a split assembly structure.

In a specific implementation, as shown in FIG. 8, the needle base 6 is cylindrical, and the elastic sealing limit base 7 is disposed at the top of the needle base 6, and the two form a unitary single structure or a split type. Assembly structure. In a specific implementation, the annular sealing limit engaging portion 10 of the outer wall of the elastic sealing limiting base is formed with a plurality of notches or cutting lines, and the above structure plays an auxiliary function, and the annular sealing limit engaging portion is stretched and contracted. The deformation can reduce the resistance when the inner needle seat is pulled back.

 In a specific implementation, as shown in FIG. 10, the metal barb body 11 is formed by bending a single metal wire or a metal piece, and the first connecting arm 15 end is fixedly connected with the end of the core rod 2, first An arc-shaped corner 17 of 1 degree to 179 degrees is formed between the other end of the connecting arm 15 and the end of the second connecting arm 16 , and the other end of the second connecting arm 16 and the elastic arm 18 end form an arc at the top end of the metal barb 11 At the top corner 19, the other end of the elastic arm 18 is suspended.

 In a specific implementation, as shown in FIG. 9, the inner wall of the cylinder neck 4 of the cylinder 1 is provided with an annular sealing limit recess 20 matched with the annular sealing limit engaging portion 10, and the annular sealing limit is The depth of the recess 20 is 0.1 mm-20 mm, the height of the annular seal limiting recess 20 is 0.1 mm-20 mm, and the bottom of the recess of the annular seal limiting recess 20 is curved.

As shown in Fig. 1, the inner hub body 21 is assembled from the rear portion into the inner body of the syringe barrel, and the buffer zone, that is, the annular buffer gap 9 and the annular seal limit engagement portion 10 are disposed near the lower end of the inner needle seat. Wherein, the outer diameter of the annular seal limiting engagement portion 10 is smaller than the inner diameter of the cylinder neck, but since the annular buffer gap 9 is provided, the annular seal limit engagement portion 10 is subjected to the pressure of the inner wall of the cylinder neck. , the pressure will be slightly deformed to the center position, and the outer surface of the annular seal limit engaging portion 10 is curved, so that the guiding effect is obtained, so that the inner needle seat group is very smooth when it is inserted into the neck of the cylinder. An annular seal limit recess 20 is provided in the neck to cooperate with the annular seal limit engagement portion 10. When the annular seal limit engagement portion 10 is displaced thereto, the annular seal limit engagement portion 10 Just sliding into the annular seal limit recess 20, at this time, the pressure acting on the annular seal limit engagement portion 10 disappears or partially disappears, and the ring is dense. The sealing position engaging portion 10 is reset and deformed, and is engaged with the annular sealing limit recess 20, and the outer wall of the annular sealing limit engaging portion 10 is closely attached to the inner wall of the annular sealing limiting recess 20 to realize the inner needle seat and the neck neck. The limit sealing effect is as shown in the figure. The core 1 is provided with a core rod 2, the end of the core rod 2 is sleeved with a rubber plug 3, and the end of the core rod 2 is assembled with a metal barb body 11.

 As shown in Fig. 2, the syringe is used, the core rod is pushed forward, the metal barb body at the end of the core rod is displaced forward, and the end of the metal barb body forms a curved detour portion, and the width of the meandering portion is slightly Less than or equal to the diameter of the inner cavity of the pull-back locking cavity 5, so that the end of the barb body easily enters the pull-back locking cavity 5, and the rear width of the metal barb body is larger than the inner diameter of the pull-back locking cavity 5 However, since the end portion of the twisted portion has an elastic characteristic, the elastic arm of both sides of the metal barb is bent and the inner side of the twisted portion is easily deflected toward the inner side. At this time, the inner angle of the rounded portion becomes small, and thus, the metal barb The body can be fully inserted into the pull-back locking cavity.

As shown in FIG. 3, after the metal barbs enter the pull-back locking cavity, since the metal member has elastic characteristics, the angle between the top end of the metal barbs becomes smaller, and a reverse force is applied to the outside. The force is transmitted to the inner wall of the pull-back locking chamber through the elastic arms on both sides of the metal barb. At this time, the core rod is pulled backward, because the end of one elastic arm of the metal barb body is suspended, and the other elastic arm The end portion forms a reverse angle, which causes the metal barb not to be completely inserted vertically into the pull-back locking cavity, and a slight deflection occurs when inserted, so the angle between the suspended end of the elastic arm and the inner wall of the pull-back locking cavity is slightly larger. When the core rod is pulled, the metal barb body is pulled in the reverse direction, and the floating end of the elastic arm is easily inserted into the inner wall of the pull-back locking cavity. At this time, the end of the core rod is firmly locked by the metal barb body, and the homeoscopic seat is firmly locked. Pulling the core rod, the inner needle seat is taken out from the neck of the cylinder body, and the arc of the outer lower edge of the annular seal limiting engagement portion 10 is relatively gentle, so it is easy to be ring-shaped after being compressed and deformed toward the center. Sealing in the recessed depression, continue Pull the mandrel backwards until the entire needle head is completely pulled into the barrel cavity. The reverse angle formed by the lower end of the elastic arm will deflect the needle head to one side, causing the needle tube to completely deviate from the neck and the needle head cannot be newly assembled again. Inside the neck, at this time, push the core rod forward, and bend the end of the needle tube, thus completing the entire safe self-destruct operation of the syringe.

 The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention.

Claims

^ ^  A safe self-destructing syringe comprising a cylinder (1), a core rod (2) in the cylinder body (1), a rubber plug (3) sleeved at the core rod (2), a cylinder body ( 1) The inner neck seat body (21) is provided in the neck (4), the lower end of the inner needle seat body (21) is provided with a pull-back locking cavity (5), and the end of the inner needle seat body (21) is provided with a needle tube (12), characterized in that: the inner needle seat body (21) is provided with a needle base (6), and an elastic sealing limit base (7) integrally formed with the needle base (6), The two are integrated into a single structure, and an annular step (8) or an annular slope is formed between the needle base (6) and the elastic sealing limit base (7), and the surface of the limiting base (7) is elastically sealed. An annular buffer gap (9) is opened, and an annular sealing gap (9) is formed on the outer wall of the elastic sealing limit base (7) on the outer side of the annular buffer gap (9), and the end of the core rod (2) Features a metal barb (11).  2. A safe self-destructing syringe, which comprises a cylinder (1), a core rod (2) is arranged in the cylinder body (1), and a rubber plug (3) is sleeved at the core rod (2), the cylinder body ( 1) The inner neck seat body (21) is provided in the neck (4), the lower needle end body (21) is provided with a pull-back locking cavity (5) at the lower end, and the needle end of the inner needle seat body (21) is provided with a needle tube (12), characterized in that: the inner needle seat body (21) is provided with a needle base (6), and an elastic sealing limit base (7) integrally formed with the needle base (6), The two-component assembly structure forms an annular step (8) or an annular slope between the needle base (6) and the elastic sealing limit base (7), and the surface of the elastic sealing limit base (7) is opened. Annular buffer gap (9), annular buffer gap (9) The outer side of the elastic seal limit base (7) forms an annular seal limit engagement portion (10), and the core rod (2) is provided at the end Metal barbs (11). 3. A safe self-destructing syringe according to claim 1 wherein: The height of the annular buffer gap (9) from the notch to the bottom of the groove is 0.1 mm-20 mm, the width of the annular buffer gap (9) is 0.1 mm-20 mm, the annular buffer gap (9), the outer groove wall and the ring shape The distance between the arcuate top of the surface of the sealing limit engagement portion (10) is 0.1 mm-20 mm, and the annular buffer gap (9) is between the outer groove wall slot and the outer wall of the annular seal limit engagement portion (10). The distance between the holes is 0.1mm-20mm, and the distance between the bottom of the outer groove wall and the outer wall of the annular seal limit engagement portion (10) is 0.1mm-20mm.  4. A safe self-destructing syringe according to claim 1, wherein the surface of the annular seal limiting engagement portion (10) is curved.  The safe self-destructing syringe according to claim 1, wherein: the surface of the annular seal limiting engaging portion (10) is curved, and the distance from the top of the arc to the edge of the curved surface Less than the distance from the top of the arc to the lower edge of the arc.  The safety self-destructing syringe according to claim 1, wherein: the outer wall of the elastic sealing limit base (7) of the lower portion of the annular seal limiting engagement portion (10) is formed in a ring shape. Depression (13).  The safe self-destructing syringe according to claim 6, wherein: the annular recess (13) is located at the same level as or higher than the annular buffer gap of the groove bottom of the annular buffer gap (9). (9) The bottom of the groove.  The safe self-destructing syringe according to claim 1, characterized in that: the annular step (8) is sleeved with an "O"-shaped sealing rubber ring (14).  The safe self-destructing syringe according to claim 1, characterized in that: the upper surface of the elastic sealing limit base (7) is provided with an annular buffer gap (9). 10. A safe self-destructing syringe according to claim 1 wherein: An annular buffer gap (9) is formed on the lower surface of the elastic sealing limit base (7).  The safe self-destructing syringe according to claim 1, wherein: the needle base (6) is cylindrical, and the elastic sealing limit base (7) is disposed on the needle base (6). At the bottom, the two form a one-piece unitary structure or a split-type assembly structure. A safe according to claim 1 of the auto-disable syringes, characterized in _that: said needle base (6) into a cylinder-shaped, elastic sealing stopper base (7) provided in the needle bed (6 At the middle of the cylinder, the two form a one-piece unitary structure or a split-type assembly structure.  The safe self-destructing syringe according to claim 1, wherein: the needle base (6) is in the shape of a cylinder, and the elastic sealing limit base (7) is disposed on the needle base (6). At the top, the two form a one-piece unitary structure or a split-type assembly structure.  The safety self-destructing syringe according to claim 1, wherein: the annular sealing limit engagement portion (10) of the outer wall of the elastic sealing limiting base (7) forms a plurality of notches or Cut the line. A safe according to claim 1 of the auto-disable syringes, characterized in _that: said metallic barb (11) formed by bending a single metal wire or sheet metal in which a first connecting arm (15) The end is fixedly connected to the end of the core rod (2), and the other end of the first connecting arm (15) and the end of the second connecting arm (16) form an arc-shaped chamfer (17) of 1 degree to 179 degrees, second The other end of the connecting arm (16) forms a curved apex angle (19) at the top end of the metal barb (11) with the elastic arm (18), and the other end of the elastic arm (18) is suspended. The safe self-destructing syringe according to claim 1, characterized in that: the inner wall of the cylinder neck (4) of the cylinder body (1) is provided with an annular sealing limit engagement portion (10) Cooperating annular seal limit recess (20), depth of annular seal limit recess (20) The height of the annular seal limit recess (20) is 0.1mm-20mm, and the bottom of the recess of the annular seal limit recess (20) is curved.