WO2004004808A1

WO2004004808A1 - Injector with self-destruction structure

Info

Publication number: WO2004004808A1
Application number: PCT/CN2003/000473
Authority: WO
Inventors: Hsien-Ming Hsieh
Original assignee: Hsien-Ming Hsieh
Priority date: 2002-07-02
Filing date: 2003-06-18
Publication date: 2004-01-15
Also published as: CN2536248Y; AU2003281247A1

Abstract

The invention relates to a medical instrument, particularly to an injector with self-destruction structure. The injector comprises a syringe assembly (100), a needle stem assembly (200), and a needle stand assembly (300). The syringe assembly (100) comprises a syringe (110) and a needle cap (120). The syringe consists of a syringe body (111). One end of the needle cap (120) is connected to the bottom of the syringe body (111). A through hole (112) is provided at the bottom of the syringe body (111). The other end of the syringe body (111) is open. The needle stem assembly (200) goes through the open end (114), and can slide within the syringe body (111). The needle stand assembly (200) is provided in the bottom of the syringe body (111). There is a through hole (311) for medicament on the needle stand assembly (300). There is a rest (310) for needle on the needle stand assembly (300). The rest (310) for needle goes through the through hole (112) at the bottom of the syringe body (111). There is a self-destruction structure between the needle stem assembly (200) and the needle stand assembly (300). The needle stem assembly (200) is connected to the needle stand assembly (300) so that the needle stem assembly (200) slides along the inner side of the syringe body (111) with the needle stand assembly (300). The injector according to the invention can be destroyed by itself after being used. Thus the opportunity of spreading diseases is decreased.

Description

TECHNICAL FIELD The present invention relates to a syringe with a self-destructing structure, and more particularly to a syringe for a disposable medical device. BACKGROUND Most existing syringes are composed of a syringe, a needle shaft, and an injection needle. The syringe is circular, and the needle is detachably sleeved on the extended needle connector or the needle seat at the bottom of the syringe. The needle seat and the syringe are integrally injection-molded. One end of the needle rod is equipped with a piston, which is used to draw the injection solution into the syringe and inject it into the body through the injection needle. The other end of the needle rod has a handle, and the end of the barrel has an open hand support. And hand rest to inject the medicine in the syringe into the body. The syringe has the following disadvantages when used:

1. Since medical work is a rigorous work for preventing and treating diseases, preventing the spread of diseases, especially for direct contact with the virus and other factors cannot be ignored. However, there are often some criminals in the society who collect or recycle used disposable syringes for personal benefit, and then sell them in packages, which brings many disadvantages to medical work; and the existing syringes themselves do not have a compulsory destruction structure, Make illegal elements multiply.

The existing syringes still have their injection needles set on the needle holders of the syringe barrels after use, and the needles are exposed, which can easily stab the human body, especially the medical workers and post-processing staff, and cause infection. Disclosure of contents Therefore, it can be seen from the above that the known syringes mentioned above obviously have inconveniences and disadvantages in actual use, and need to be improved.

Therefore, the author felt that the above-mentioned shortcomings could be improved, and he devoted himself to studying and cooperating with the application of science, and finally proposed a practical design with reasonable design and effective improvement of the above shortcomings.

The main purpose of the present invention is to provide a syringe with a self-destructing structure, which can destructively treat its parts one by one during use, effectively prevent re-use, and can retract the needle into the syringe to It prevents infection from pathogenic sources and is convenient and reliable to use.

In order to achieve the above object, the present invention mainly provides a syringe with a self-destructing structure, which includes: a syringe assembly, a needle bar assembly, and a needle seat assembly, wherein the needle The barrel assembly includes a syringe and a needle cap. The syringe has a barrel body. One end of the needle cap is connected to the outside of the bottom of the barrel body. A through hole is provided at the bottom of the barrel body to correspond to the needle cap, and the other end of the barrel body is Figure diagram diagram diagram diagram diagram

Open; the needle bar assembly penetrates the opening of the syringe body and is pivotally located in the syringe; and the needle seat assembly is installed in the bottom of the syringe body, the needle seat assembly has a through-medicine channel hole, and the needle seat The component has an injection needle mounting seat at the exit corresponding to the medicinal solution channel hole, the injection needle mounting seat is penetrated through a through hole at the bottom of the syringe barrel body, and there is an engaging self-destructing structure between the needle bar assembly and the needle seat assembly. The self-destructing structure enables the needle bar assembly to be engaged with the needle base assembly, and the needle bar assembly drives the needle base assembly to slide along the inner wall of the syringe barrel.

By using the self-destructing structure, the used needle seat assembly of the used syringe can be retracted into the syringe assembly, that is, the middle of the syringe, to achieve protective self-destruction to prevent it from being used again or hurting the staff. Brief description of the drawings

1 is an exploded perspective view of the first embodiment of the present invention.

2 is a three-dimensional combined view of the first embodiment of the present invention.

3 is a cross-sectional view of the first embodiment of the present invention.

It is a sectional view taken along the line B-B in FIG. 3.

5 is a sectional view taken along line C-C in FIG. 3.

6 is a schematic diagram of the assembly of the syringe assembly of the first embodiment of the utility model with one quarter of the syringe removed.

7 is a schematic plan view of a needle bar assembly according to the first embodiment of the present invention. 8 is a schematic diagram of the assembly of the needle bar, the needle bar hook and the needle bar piston in the first embodiment of the present invention.

FIG. 9 is an assembly diagram of the needle hub assembly according to the first embodiment of the present invention.

FIG. 10A is a sectional view of a syringe assembly according to the first embodiment of the present invention.

FIG. 10B is a right side view of the syringe assembly according to the first embodiment of the present invention.

Fig. 10C is a cross-sectional view taken along A-A of Fig. 10A.

FIG. 10D is a C-C cross-sectional view of FIG. 10A.

FIG. 11A is a schematic plan view of a needle bar according to the first embodiment of the present invention.

FIG. 11B is a right side view of the needle bar according to the first embodiment of the present invention.

FIG. 12A is a schematic plan view of a needle bar hook according to the first embodiment of the present invention.

FIG. 12B is a top view of the needle bar hook according to the first embodiment of the present invention.

Fig. 12C is a sectional view taken along the line C-C of Fig. 12B.

Fig. 12D is a sectional view taken along the line B-B in Fig. 12B. FIG. 13A is a top view of the needle rod piston according to the first embodiment of the present invention.

Fig. 13B is a cross-sectional view taken along A-A of Fig. 13A.

FIG. 14A is a schematic plan view of a needle hub according to the first embodiment of the present invention.

FIG. 14B is a sectional view of the needle hub of the first embodiment of the present invention.

Fig. 14C is a sectional view taken along the line B-B of Fig. 14B.

Fig. 15 is a longitudinal sectional view of the needle seat piston according to the first embodiment of the present invention.

FIG. 16 is a sectional view of a second embodiment of the present invention.

FIG. 17A is a schematic plan view of a needle hub according to a second embodiment of the present invention.

Fig. 17B is a cross-sectional view taken along A-A of Fig. 17A.

FIG. 18A is a sectional view of a third embodiment of the needle hub of the present invention.

Fig. 18B is a sectional view taken along the line B-B in Fig. 18A.

FIG. 19 is an assembly schematic diagram of the needle seat structure of the third embodiment of the needle seat of the present invention applied to the second embodiment of the invention. Component symbol

Syringe assembly 100

Syringe 110 Syringe body 111 Through hole 112 Mounting hole 112 'Bottom 113 Open 114 Hand rest

Round long hole needle bar assembly

Needle bar

Connector Hook

Neck

hole

Annular protrusion

Annular protrusion 235

Needle Seat Assembly 300

Needle seat 310 Chemical passage hole 311

Needle mount 312 312

Needle mount 312 'cylinder 313 Headgear cavity 315

Plug ring card Opening hole Assembly hole 3152

Head into the sub needle seat piston 320

Foramen

From

In order to further understand the technology, means and effects adopted by the utility model to achieve the intended purpose, please refer to the following detailed description and drawings of the utility model for plugging the expansion slot. I believe the purpose and characteristics of the utility model As for the characteristics and characteristics, a deep and specific understanding can be obtained from this, however, the drawings are only provided for reference and explanation, and are not intended to limit the present invention.

First embodiment: A syringe with a self-destructing structure, which is different from a general syringe, is reflected. Please refer to FIGS. 1 and 2. The utility model is a syringe with a self-destructing structure, which includes a syringe assembly 100, a needle bar assembly 200 and a needle seat assembly 300. 3 and 6, the syringe assembly 100 includes at least a syringe 110 and a needle cap 120. The syringe 110 has a syringe body 111, and the needle cap 120 is connected to the outer side of the bottom 113 of the syringe body 111. The bottom 113 of the body 111 is provided with a through hole 112 corresponding to the needle cap 120, and the other end of the syringe body 111 is an opening 114; the main part of the needle bar assembly 200 is sleeved in the syringe assembly 100, and is passed through the syringe body The opening 114 of 111 is pivotally arranged in the syringe 110, forming a piston structure, similar to the existing syringe, and the two are closely fitted to each other so that the medicinal solution is sucked into the syringe 110 and injected outward. The purpose is not described here in detail; the cross-sectional shape of the inner wall of the syringe body 111 is a uniform ellipse or an oval-like shape composed of four arcs or other inner walls are polygonal. For ease of use, the inner wall shape of the syringe body 111 The best choice is a symmetrical shape structure around the central axis; the needle seat assembly 300 (this structure is completely different from the existing syringe, the existing syringe's needle seat is directly integrated with the syringe injection molding) is installed on the front and bottom 113 of the syringe body 111 Inside; the needle seat assembly 300 has a medicinal solution passage hole 311 penetrating therethrough, The needle base assembly 300 has an injection needle mounting base 312 at the exit corresponding to the medicinal liquid channel hole 311, and the injection needle mounting base 312 is penetrated through the through hole 112 on the bottom 113 wall of the syringe body 111; the injection needle mounting base 312 is at the time of assembly The bottom 113 of the syringe body 111 is extended through the through hole 112 to facilitate the assembly of an injection needle or the connection of the injection needle, that is, the medicinal solution passage hole 311 extends from the rear end surface of the needle seat assembly 300 to the outer wall of the bottom 113 of the syringe body 111. The above-mentioned needle cap 120 is connected to the outer wall of the bottom 113 of the syringe body 111 and corresponds to the through hole 112. The needle bar assembly 200 and the needle seat assembly 300 have an engaging self-destructing structure. The engaging self-destructing structure is that the needle bar assembly 200 and the needle seat assembly 300 are engaged, and the needle bar assembly 200 drives the needle seat assembly 300 along the needle. The inner wall of the barrel 111 slides, and the self-destructing structure engages the two together, and the needle seat assembly 300 can slide along the inner wall of the barrel 111 with the needle bar assembly 200. The self-destructing structure can be used to force the used Note 3 The syringe base assembly 300 of the injector is retracted into the syringe assembly 100, that is, the middle of the syringe, to achieve the protective self-destructive purpose, so as to prevent being used again or stabbing the staff.

The self-destroying structure pan pointer assembly 200 and needle seat assembly in the utility model

All structures that snap together and drive the needle seat assembly 300 to slide. For example, a fitting structure between a T-shaped hook protruding from the front end surface of the needle bar assembly 200 and a hole opened on the needle base assembly 300 with an enlarged bottom hole and matching the τ-shaped hook.

Referring to FIG. 3, the front end of the needle bar assembly 200 is pivoted and extends with a hook portion 221, and the needle base assembly

The receiving cavity portion 315 is provided in 300. The engaging self-destructing structure is that the hook portion 221 is inserted into the receiving cavity portion 315 and rotated to a certain angle to be engaged with the receiving cavity portion 315.

Referring to FIG. 3 again, the hook portion 221 includes a head portion 2211 and a neck portion perpendicular to the head portion 2211.

2212, the cross-sectional area of the head 2211 is larger than the cross-sectional area of the neck 2212; please refer to FIG. 5 at the same time, the cavity portion 315 is formed by the insertion hole 3151 corresponding to the head 2211 of the hook portion 221 and the bottom of the insertion hole 3151 The expansion hole 3152 is configured, and the expansion hole 3152 is the head of the hook portion 221

2211 rotates at an angle of less than 90 degrees. The depth of the above-mentioned insertion hole 3151 is the same as or slightly shorter than the length of the neck portion 2212 of the hook portion 221, and the height dimension of the expansion hole 3152 is the same as or slightly larger than the thickness dimension of the head portion 2211 of the hook portion 221 to ensure a compact fit. In order to reduce the carryover of the injection solution during use.

3 and FIG. 4, the needle bar assembly 200 includes a needle bar 210, a needle bar hook 220, and a needle bar piston 230; the main body of the needle bar hook 220 is embedded in the needle bar piston 230, and the needle bar piston 230 and The above-mentioned inner wall of the syringe body 111 is matched to ensure a good sealing performance between the needle rod piston 230 and the inner wall of the syringe body 111 to prevent the drug solution from leaking out. Because the inner wall of the syringe body 111 is oval or similar The ellipse and other shapes can ensure that the needle bar piston 230 can move left and right along its axis, as shown in the arrow direction of FIG. 6, and cannot rotate around the axis. The front part of the needle bar 210 is connected with the insert through a strong fitting connection structure. The rear part of the main body of the needle bar hook 220 installed in the needle bar piston 230 is connected, and the needle bar 210 drives the needle bar hook 220 to perform a sealed rotation. The strong connection structure can ensure that the needle bar hook 220 can Rotate with the needle bar 210. Here, the main part of the "embedded" pan pointer rod hook 220 is embedded in the needle rod piston 230, so that the needle rod hook 220 and the needle rod piston 230 are tightly coupled together (see this embodiment); the "set" pan pointer The middle of the rod hook 220 passes through the needle rod piston 230, and both ends of the rod hook 220 hold the needle rod piston 230 therein and join the needle rod hook 220 with the needle rod piston 230 (this structure has been disclosed in the applicant's previous patent) . The above-mentioned "T" hook, which is pivoted and extends the front end surface of the needle bar assembly 200, is capable of rotating the hook portion 221 and the needle bar hook 220 integrally. .

Please refer to FIG. 3 again, the needle base assembly 300 includes a needle base 310 and a needle base piston 320; the needle base 310 is tightly fitted in the needle base piston 320, and the needle base piston 320 and the above-mentioned syringe body 111 Anastomosis of the wall (see Figure 5) to ensure a good sealing performance between the needle seat piston 320 and the inner wall of the syringe body 111 to prevent the drug solution from leaking out, and because the inner wall of the syringe body 111 is oval or similarly oval The shape and the like can ensure that the needle seat assembly 300 can only move left and right along its axis direction, and cannot rotate around the axis, as shown in the arrow direction of FIG. 6; The above-mentioned cavity portion 315 is located inside the needle seat 310, and the cavity The part 315 satisfies the structural requirements that the hook part 221 at the front of the needle bar hook 220 described above is inserted and rotated at an angle of less than 90 degrees and snapped together. The self-destructing structure formed by the hook portion 221 and the cavity portion 315 can ensure that the needle bar hook 220 and the needle base 310 are locked together. When the needle bar 210 is pulled out with force, the needle base 310 and the needle base can be ensured. The piston 320 is moved outward (in the direction of the opening 114 of the syringe body 111), so that the needle on the needle base 310 is retracted into the syringe 110, thereby achieving self-destructing and protective purposes.

10A to 10D, the syringe assembly 100 includes the above-mentioned syringe 110, the syringe 110 includes the above-mentioned syringe body 111, and the bottom 113 of the syringe body 111 has the above-mentioned through hole 112; the syringe body 111 is a cylindrical shape with a uniform inner wall cross-section, having the above-mentioned bottom 113 and the above-mentioned opening 114 at the rear end, and the inner wall cross-sectional shape of the syringe body 111 is oval or quasi-ellipse (four-segment arc) or other polygonal inner walls. The cylindrical shape is oval as shown in FIG. 10B; the edge wall of the rear end opening 114 of the syringe body 111 is folded outward to form a hand rest 115, which is convenient to use. In addition to the above-mentioned syringe 110, the syringe assembly 100 also includes the above-mentioned needle cap 120. The syringe 110 and the needle cap 120 are connected by a weak and fragile structure 130. The needle cap 120 is mounted on the outer wall of the bottom 113 of the syringe body 111 through a weak and easily destructible structure 130, and corresponds to the above-mentioned through-hole 112 through which the injection needle mounting base 312 passes during assembly; the needle cap 120 is a hollow cylindrical shape, and The circular long hole 121 capable of accommodating the injection needle mounting seat 312 and the injection needle is provided on the rear wall with reinforcing ribs 122. As shown in FIG. 10C, there are four reinforcing ribs 122; as shown in FIG. 10D, the easy The damage structure 130 is a plurality of smaller connecting posts 131 connected to the needle cap 120 and the bottom 113 of the syringe 110. When in use, the needle cap can be twisted off along the easily-breakable structure 130, and four connecting posts 131 are evenly distributed. . As shown in FIG. 10A, a ring-shaped protrusion 116 along the inner wall of the syringe body 111 is provided at the open end 114 of the syringe body 111 to prevent the needle bar assembly 200 from accidentally sliding out.

Please refer to FIGS. 11A and 11B. The needle bar 210 in the needle bar assembly 200 includes at least a middle needle bar body 211, a rear handle 212, and a front connector 213. As shown in FIG. 11B, the handle 212 is approximately oval The shape is convenient for injection, and its area is larger than the cross-sectional area of the syringe body 111. It is located at the rear end of the needle shaft 211, and its handle 212 is located outside the syringe body 111 after assembly. The cross section of the needle bar body 211 is a “ten” shape, which can be gradually reduced as it approaches the handle 212. Its outer edge size is smaller than the inscribed circle diameter of the inner wall of the needle barrel body 111, which is convenient for the rotation and use of the needle bar 210. There is a foldable structure 214 at the same position of the needle bar body 211. The foldable structure 214 is a "V" -shaped foldable structure 214, which is opened on each of the "ten" -shaped structures, and other foldable structures can also be used. Structure, such as through holes or other holes in each of the "ten" -shaped needle bar body 211 structure Shape notch. After the injection is completed, the needle bar body 211 is pulled out to forcefully break the needle bar body 211 along its "V" -shaped foldable structure 214 to achieve protective damage. The connector 213 at the front of the needle bar 210 is connected to the needle bar body 211 by a circular plate 215 transverse to the front end of the needle bar body 211; the connector 213 is a "T" shaped connector 213 with a ladder-shaped head, which is convenient for strong connection . There are two piston seats 216 symmetrical to each other on both sides of the central axis of the front part of the needle bar body 211, and the two piston seats 216 are connected to the needle bar 210 through respective point connection structures 217, respectively. The shape of the piston seat 216 is the same as the shape of the syringe body 111 there, as shown in FIG. 11B. The connector 213 at the front of the needle bar 210 is located at the center of the circular plate 215. As shown in FIG. 11B, the respective point connection structures 217 of the two piston seats 216 are respectively located at the edges of the circular plates 215 opposite to the two piston seats 216. After installation, the piston seats 216 are located at the two edges of the needle bar 210, and The inner wall of the syringe body 111 has a certain distance, which is convenient for use (such as when pushing and pulling the needle bar 210) without damaging its structure. This point connection structure 217 constitutes a fragile point on the piston seat 216. After the needle bar 210 is rotated after the injection is completed, since the piston seat 216 is caught by the syringe body 111, the two point connection structure 217 of the piston seat 216 is destroyed. To achieve the purpose of mandatory self-destruction after use. The handle 212 has symmetrical wings at both ends, which is convenient to use.

Referring to FIGS. 12A to 12D, the needle bar hook 220 in the needle bar assembly 200 has a rear cylindrical body 222 in addition to the above-mentioned hook portion 221, and the rear portion is cylindrical to facilitate its rotation. The neck portion 2212 of the hook portion 221 is connected to the front end surface of the cylinder 222 through a cylindrical connection portion 2213. The neck portion 2212 of the hook portion 221 is cylindrical, and the connection portion 2213 is a square column. As shown in FIG. 12B, The cylinder is inscribed in a square column. As shown in Figs. 12B and 12C, a cavity 223 is provided in the rear of the cylinder 222, and the cavity 223 is matched with the connector 21.3 of the above-mentioned needle bar 210. The cavity 223 is formed by a hole 2231 on the central axis and a through hole perpendicular to the hole. The hole 2232 is formed by a hole 2232 which is a through hole and penetrates the entire cylinder 222, which is convenient for processing. In fact, blind holes can also be used where processing permits.

Please refer to FIG. 3 and FIG. 5 again. The strong fitting connection structure between the front part of the needle bar 210 and the rear part of the main body of the needle bar hook 220 is that the connector 213 at the front of the needle bar 210 is strongly inserted into the needle bar hook 220. In the cavity 223 of the cylindrical body 222, the neck size of the "T" connector 213 is slightly smaller than the outer size of the hole 2231 in the cavity 223, and the size of the hole 2232 in the cavity 223 can accommodate the "T" connection When assembling the trapezoidal head of the head 213, the head of the "T" type connector 213 passes through the hole 2231 and is received in the hole 2232. At this time, the neck of the "T" type connector is in the hole 2231 and is The hole 2231 is closely fitted to form a whole. When the needle bar 210 is rotated, the needle bar hook 220 will rotate together with the needle bar 210.

Please refer to FIGS. 13A and 13B. First, refer to FIG. 4. The needle rod piston 230 is a columnar body that matches the inner wall of the syringe body 111, and its outer contour matches the inner wall of the syringe 110, that is, its cross-sectional shape is Oval or quasi-ellipse (formed by four arcs) with cavity 231 in it, The cavity 231 can receive a cylindrical body 222 at the rear of the needle bar hook 220. The cavity 231 is consistent with the shape of the cylindrical body 222 at the rear of the needle bar hook 220, and is also a cylindrical shape. Therefore, the depth of the cavity 231 is the same as the length of the cylindrical body 222 of the needle bar hook 220, and the cavity is the same. The radius of 231 may be slightly larger than the radius of the cylinder 222 to ensure that the above-mentioned cylinder 222 can rotate in the cavity 231; in order to better ensure its overall sealing performance, the size of the cavity 231 may also be the same as the above-mentioned cylinder 222 Or slightly smaller, because the needle bar piston 230 is made of thermoplastic elastic material during processing, it will not affect the rotation of the needle bar hook 220 therein. A through hole 233 is provided at the bottom of the front end of the cavity 231, and the through hole 233 corresponds to the square pillar-shaped connecting portion 2213 in the needle bar hook 220. The depth of the through hole 233 is consistent with the height of the square pillar-shaped connecting portion 2213. An interference fit with each other, that is, its size is slightly smaller than that of a square cylinder to ensure its sealing performance and prevent the liquid medicine from seeping out. When assembling, the front hook of the needle bar hook 220 passes through the through hole 233 strongly. Because of the piston made of thermoplastic material, the needle bar hook 220 can be rotated inside the needle bar piston 230 when the force is applied; and during injection, it will not cause The chemical liquid leaks out from the through hole 233 toward the opening 114 of the syringe 110, and has reliable sealing performance.

Please refer to FIG. 8 again, when the needle bar assembly 200 is assembled, the needle bar hook 220 is first inserted into the needle bar piston 230 along the axis and the front hook extends out of the front of the piston, and then the needle bar 210 is strongly inserted into the assembled The needle bar hook 220 in the needle bar piston 230 constitutes a needle bar assembly 200.

Please refer to FIGS. 12A to 12D again, a circular groove 224 is formed on the front surface of the cylinder 222, and a circular and concave semicircular arc groove 225 is provided on the rear surface; please refer to FIG. 13A, The cavity 231 has a ring-shaped protrusion 232 in the front part and a half-arc ring-shaped protrusion 235 in the rear part. The annular protrusion 232 corresponds to and coincides with the annular groove 224, and the protrusion 235 corresponds to and coincides with the concave semicircular arc groove 225. The anastomosis structure can prevent the needle bar hook 220 from disengaging from the needle bar piston 230, and plays a sealing and positioning role when the needle bar hook 220 is rotated.

Please refer to FIG. 3 and FIGS. 13A and 13B again. The outer contour of the above-mentioned needle bar piston 230 matches the inner wall of the syringe body 111, and the sealing performance between the needle bar piston 230 and the syringe body 111 is guaranteed. It is convenient for the needle bar piston 230 to be slidably and tightly installed in the syringe body 111. When the needle bar assembly 200 is pulled left or right according to the state shown in FIG. 3, the medicine liquid can be sucked into the syringe body 111 through the medicine liquid passage hole 311. Inside or outside the syringe body 111. The needle bar hook 220 is embedded in the cavity 231 of the needle bar piston 230 and its front hook portion 221 protrudes from the front surface of the needle bar piston 230. To ensure that the needle bar hook 220 cooperates with the needle bar piston 230, the needle is extended The connecting portion 2213 of the hook portion 221 on the front end surface of the rod piston 230 is tightly fitted with the needle rod piston 230 to prevent the penetration of the medicinal solution. The needle rod piston 230 is made of a non-toxic elastic material, such as a rubber material, and the elastic material In addition to ensuring the sealing performance of the manufactured needle bar piston 230, the needle bar hook 220 can also be rotated in the needle bar piston 230. The front of the needle bar 210 is forcibly mounted (inserted). The rear of the needle bar hook 220 inside the needle bar piston 230 allows the needle bar hook 220 to follow the needle bar when the needle bar 210 is rotated. 210—turn.

14A to 14C, in addition to the medicinal solution passage hole 3Π and the injection needle mount 312 described above, the needle base 310 also has a rear cylinder 313 (such as an oval cylinder) similar to the syringe body 111. ) And the front plug 314; the plug 314 is located on the central axis of the needle base 310 and is used for assembling between the needle base 310 and the through hole 112 of the syringe body 111. In this embodiment, the needle base 310 and the plug 314 are the connecting parts of the injection needle mounting base 312 and the rear post 313 of the needle base 310, and the plug 314 and the injection needle mounting base 312 are located on the central axis, that is, the needle base assembly The medicinal solution passage hole 311 in 300 is located on the central axis of the needle base assembly 300, that is, the central axis of the plug 314. Therefore, the through hole 112 through which the above-mentioned injection needle mounting base 312 passes also serves as the assembly hole of the needle base 310. The two are combined into one (see Figure 3 and Figure 10A). The plug 314 is consistent with the through hole 112 (also serving as a mounting hole) of the bottom 113 of the syringe body 111, and its shape can be conical. The plug 314 is used to assemble the needle seat assembly 300 on the bottom 113 of the syringe body 111 and Just fit into the through hole 112 of the bottom 113 of the syringe body 111 (see the description of the syringe assembly 100 above). It extends outward to form an injection needle mounting base 312, which facilitates the assembly of the injection needle, and can also fix the injection needle to it during production. The above-mentioned cavity portion 315 corresponds to the above-mentioned hook portion 221. The cavity portion 315 is composed of an insertion hole 3151 corresponding to the head of the hook portion 221 and an expansion hole 3152 at the bottom of the insertion hole 3151 (see FIG. 14C). ₀ expansion The hole 3152 can rotate the head of the hook portion 221 by an angle less than 90 degrees. In order to facilitate the mold opening process, the expansion hole 3152 penetrates the entire needle base 310 along the radial direction, that is, the cylinder 313, and is perpendicular to the insertion hole 3151. The insertion hole 3151 is just to enable the hook to be inserted. The axial projection shape of the head 2211 of the hook portion 221 is the same, and it is also an approximately square (rectangular columnar hole). The expansion hole 3152 allows the hook portion 221 to pass in one direction and move in a circular motion. Do not allow the hook to pass after rotating less than 90 degrees. As shown in FIG. 14C, in order to prevent the hook portion 221 inserted into the cavity portion 315 from being returned for destructive protection purposes, a pair of clips 316 are provided on the top edge of the expansion hole 3152 corresponding to the hook portion 221. After the hook portion 221 is inserted and rotated about 90 degrees in the direction of the arrow (clockwise), it is stopped by the front wall of the expansion hole 3152 and cannot continue to rotate. At the same time, due to the elastic effect of the clip 316, it can be rotated during clockwise rotation. The hook portion 221 is passed. Once passed, the clip 316 returns to block the hook portion 221 from rotating in the reverse direction, so that the hook portion 221 cannot be returned, and the purpose of locking the hook and the needle base 310 is achieved. The medicinal solution passage hole 311 in the above-mentioned needle base assembly 300 penetrates the entire needle base assembly 300 and is located on the central axis of the needle base assembly 300.

Referring to FIG. 5, the needle seat piston 320 is a hollow cylindrical body, and its outer contour shape is consistent with the shape of the inner wall of the syringe body 111. Referring to FIG. 15, the needle seat piston 320 has a through hole 322, and the two ends of the outer wall are respectively provided with half-arc annular protrusions 321. The semi-circular arc-shaped protrusion 321 is in close contact with the inner wall of the syringe body 111 during assembly to ensure its sealing performance.

Please refer to FIGS. 14A to 14C, FIG. 15 and FIG. 9 again. An annular groove 317 is provided on the surface of the cylinder 313, and the groove 317 is used for clamping the needle seat piston 320. In order to ensure the sealing performance after assembly, The outer dimension of the annular groove 317 should be larger than the size of the above-mentioned through hole 322, and the two are tightly combined after assembly. Therefore, the through hole 322 can just ensure that the main body 313 of the needle base 310 passes and meets the space required for its assembly. When the needle base piston 320 is assembled with the needle base 310, the annular groove 317 on the needle base 310 just fits the needle base piston 320, and the two closely cooperate to form the needle base assembly 300.

Refer to Figure 13B, Figure 3, and Figure 6. To reduce the needle rod piston when pushing and pulling the needle rod assembly 200,

The frictional resistance between 230 and the inner wall of the syringe body 111 is provided with a set of annular protrusions 234 on the front and rear portions of the outer periphery of the needle rod piston 230 that fit the inner wall of the syringe body 111, which is convenient to use.

Please refer to FIG. 3 and FIG. 6. When assembling, in this embodiment, the needle seat piston 320 is first sleeved on the needle seat 310 to form a needle seat assembly 300 (as shown in FIG. 9), and then opened from the rear end of the syringe body 111. At the mouth 114, the needle seat assembly 300 is assembled to the bottom 113 of the syringe body 111 in a correct orientation. At this time, the injection needle mounting seat 312 in the needle seat assembly 300 extends from the through hole 112 (also serving as an assembly hole) of the syringe body 111. Out of the syringe body 111, its plug 314 is just caught in its through hole 112 (also serves as an assembly hole). Since the needle seat piston 320 is closely fitted with the needle seat 310, the shape of the needle seat piston 320 is in turn the same as the syringe body 111. The inner walls match with each other, resulting in an ideal sealing effect, so that liquids such as medicinal liquid will not leak out (see Figure 6). The needle bar hook 220 is embedded in the needle bar piston 230 (see FIG. 8). At this time, the hook portion 221 at the front of the needle bar hook 220 extends from the needle bar piston 230, and then the needle bar 210 is forcibly mounted on the needle bar. The piston 230 constitutes a needle bar assembly 200 (see FIG. 8). Finally, the needle bar assembly 200 is assembled into the syringe body 111 from the rear opening 114 of the syringe body 111 in the correct orientation. After assembly, the needle bar hook 220 in the needle bar assembly 200 is just right Align the cavity portion 315 on the needle base 310.

In use, firstly separate the needle cap 120 along its weak and fragile structure 130 connected to the syringe body 111 (a destructive permanent separation) to expose the injection needle mounting seat 312 in the needle seat assembly 300. The injection needle is installed, and the injection needle can be injection-molded on the mounting seat 312 during processing. After extracting the liquid medicine, injection is performed. After the injection is completed, the hook portion 221 at the front of the needle bar hook 220 is pushed into the cavity portion 315 of the needle seat piston 320. The approximately rectangular parallelepiped head 2211 enters the bottom of the insertion hole 3151 of the needle seat 310, and the needle bar 210 is rotated clockwise. The angle (less than 90 degrees) is about 90 degrees in this embodiment. At this time, the hook portion 221 is caught by the clip 316 in the cavity portion 315, so that the hook portion 221 must not move backward to realize the self-destruct function. At this time, because the hook portion 221 is caught and cannot be returned, the needle bar assembly 200 and the needle seat assembly 300 are engaged together, and the needle bar 210 is pulled out with force. The needle seat assembly 300 will follow the needle bar 210 to the center of the syringe 110. Move the needle holder 310 away from the bottom 113 of the syringe body 111 to prevent the needle from stabbing a medical staff or staff after the injection. At the same time, when the needle bar 210 is rotated, the piston seats 216 on both sides of the needle bar 210 are received by the syringe. The limit of 110 will be broken along its point connection structure 217 to prevent it from being used again. Then twist the needle bar 210 with force to reduce the medical waste and achieve self-destructive protection.

Second Embodiment: The structure disclosed in the embodiment is particularly suitable for an intravenous syringe. Please refer See FIG. 16, which includes a syringe assembly 100, a needle bar assembly 200, and a needle seat assembly 300. The syringe assembly 100 includes at least a syringe 110 having a syringe body 111, and a through hole 112 and a mounting hole 112 'at the bottom 113 of the syringe body 111, respectively. The needle bar assembly 200 also includes a needle bar 210, a needle bar hook 220, and The needle bar piston 230 has the same assembly structure as the first embodiment, and a hook portion 221 protrudes from the front end surface of the needle bar piston 230. The needle base assembly 300 also includes a needle base 310 and a needle base piston 320. The rear portion of the seat 310 also has a hook receiving cavity portion 315. Except that the component structures described above are different from the first embodiment, other components are the same as those of the first embodiment, and their assembly and usage are also the same as those of the first embodiment. It will not be described in detail here. In addition, the syringe assembly 100 also includes a needle cap 120 and a weak and fragile structure 130 connected to the syringe. The following description focuses on a structure different from the first embodiment.

Please refer to FIG. 16 and FIGS. 17 A and 17 B. The plug 314 at the front of the needle base 310 is located on the central axis of the needle base 310 (same as the first embodiment) to ensure the accuracy of assembly and the impact of squeezing. Is used for assembling between the needle base 310 and the mounting hole 112 ′ of the bottom 113 of the syringe body 111; and the through-medicine channel hole 311 is offset from the central axis of the needle base assembly 300, that is, it is offset from the plug 314 and the drug channel hole The injection needle mount 312 ′ at 311 passes through the through hole 112 of the bottom 113 of the syringe body 111.

Please refer to FIGS. 18A and 18B, which are structural diagrams of another needle base 310 suitable for the first embodiment. The needle base 310 also has a medicinal fluid passage hole 311, and includes an injection needle mounting base 312 with a plug 314 and a rear cylinder 313 (such as an oval cylinder) similar to the syringe body 111; the plug 314 is used for the needle Assembly between the base 310 and the syringe body 111. The cavity portion 315 is also composed of an insertion hole 3151 and an expansion hole 3152. The insertion hole 3151 is located at the central axis of the front portion of the cylinder 313. At the bottom of the expansion hole 3152, there is an assembly hole penetrating the entire needle seat 310 and the cylinder 313 along the axis direction 3152〃, the mounting hole 3152〃 is a circular hole whose diameter is the same as the diameter of the circumscribed circle of the above-mentioned expansion hole 3152. The mounting hole 3152〃 is convenient for reasonable processing of the cavity portion 315; the injection needle mounting seat 312 can be passed through a mounting seat cover 312 " Installed in the mounting hole 3152〃, its mounting seat cover 312 "is close to the bottom of the expansion hole 3152, and can be fixed together after assembly to form a whole.

Referring to FIG. 19, in combination with the second embodiment and the eighteenth FIGS. 18A and 18B, the figure shows an assembly diagram of the needle seat structure applied in the second embodiment, and the structure and diagram of the cavity portion 315 thereof The structures reacted by 18A and 18 B are the same. The plug 314 at the bottom of the needle base 310 is located on the central axis of the needle base 310 and is assembled in the mounting hole 112 ′ (see FIG. 16) of the bottom 113 of the syringe body 111; and the through-medicine channel hole 311 deviates from its central axis, ie, deviates At the plug 314, the injection needle mounting seat 312 ′ at the medicinal solution passage hole 311 passes through the through hole 112 of the bottom 113 of the syringe body 111. The cavity portion 315 is also composed of an insertion hole 3151 and an expansion hole 3152. The insertion hole 3151 is located at the central axis of the rear portion of the cylinder 313. At the bottom of the expansion hole 3152, there is an entire needle seat 310 along the central axis.装配, the mounting hole 3152 "is a circular hole, and the diameter of The opening hole 3152 has the same diameter of the circumscribed circle, and the mounting hole 3152〃 is convenient for reasonable processing of the cavity portion 315. The plug 314 can be installed in the mounting hole 3152〃 through the plug sleeve 314 ", and the plug sleeve 314" abuts the bottom of the expansion hole 3152 After installation, they can be fixed together to form a whole. Industrial applicability

The utility model provides a syringe with a self-destructing structure, which can destructively treat its components one by one during use, effectively prevent re-use, and can retract the needle into the syringe to prevent infection from the source. Easy to use and reliable. The above descriptions are merely detailed descriptions and drawings of specific embodiments of the present utility model, and are not intended to limit the present utility model and its features. Those who are familiar with this technical field, follow the spirit of the present utility model, etc. All effective modifications or changes should be included in the patent scope of this application.

Claims

Rights request

1. A syringe with a self-destructing structure, including:

A syringe assembly includes a syringe and a needle cap. The syringe has a syringe body. One end of the needle cap is connected to the outside of the bottom of the syringe body. A through hole is provided at the bottom of the syringe body to correspond to the needle cap. The other end of the body is open;

A needle bar assembly is passed through the opening of the syringe body and is pivotally disposed in the syringe; and a needle seat assembly is installed in the bottom of the syringe body, and the needle seat assembly has a through-medicine channel hole. The needle seat assembly has an injection needle mounting seat corresponding to the outlet of the medicinal solution channel hole, the injection needle mounting seat is penetrated through a through hole at the bottom of the syringe body, and an engaging and self-destructing structure is provided between the needle bar assembly and the needle seat assembly. The snap-in self-destructing structure can make the needle bar assembly and the needle seat assembly engage, and the needle bar assembly drives the needle seat assembly to slide along the inner wall of the syringe barrel.

2. The syringe with a self-destructing structure according to claim 1, wherein the front end of the needle bar assembly is pivoted and extended with a hook portion, the needle seat component is provided with a cavity portion, and the snap-in self-destructing structure is a hook portion inserted into the cavity. And rotate to a certain angle and engage with the cavity.

3. The syringe with a self-destructing structure according to claim 2, wherein the hook portion is composed of a head portion and a neck portion perpendicular to the head portion, and a cross-sectional area of the head portion is larger than a cross-sectional area of the neck portion; It is composed of an insertion hole corresponding to the head of the hook portion and an expansion hole at the bottom of the insertion hole. The expansion hole allows the head of the hook portion to rotate at an angle of less than 90 degrees.

4. The syringe with a self-destructing structure according to claim 3, wherein the needle bar assembly includes a needle bar, a needle bar hook, and a needle bar piston, and the needle bar hook is embedded and sleeved in the needle bar piston, and the needle bar piston and the The inner wall of the syringe is matched, and the front part of the needle bar is connected with the rear part of the needle bar hook through a strong fitting connection structure, and drives the needle bar hook to rotate in a sealed manner; the hook part is a front part integrated with the needle bar hook, "T" type hook; the above-mentioned needle base assembly includes a needle base and a needle base piston; the needle base is tightly sleeved in the needle base piston, and the needle base piston coincides with the inner wall of the syringe barrel; the above-mentioned cavity portion is located in the needle base internal.

5. The syringe with a self-destructing structure according to claim 4, wherein the expansion hole penetrates the entire needle seat along its radial direction and is perpendicular to the insertion hole, and the expansion is provided with a pair of clips on the top edge of the hook portion .

6. The syringe with a self-destructing structure according to claim 4, wherein the bottom of the expansion hole has a mounting hole penetrating the entire needle seat along its axial direction, the mounting hole is a circular hole, and the diameter of the hole is circumscribed with the expansion hole. The circle diameter is the same, and the expansion hole has a pair of clips on the top edge corresponding to the hook portion.

7. The syringe with a self-destructing structure according to claim 5 or 6, wherein the rear part of the needle base is a cylinder and the front part is a plug, and the plug is located on the central axis of the needle base for the needle base and the syringe. For assembling the through-holes of the body, the plug is a connecting part of the injection needle mounting seat and the cylinder, and the medicinal solution channel hole in the needle seat assembly is located on the central axis of the needle seat assembly, that is, the central axis of the plug.

8. The syringe with a self-destructing structure according to claim 5 or 6, wherein the rear part of the needle seat is a cylinder and the front part is a plug, and the bottom of the syringe body is provided with an assembly hole, and the plug is located in the middle of the needle seat. On the axis, it is used for assembling between the needle seat and the assembly hole of the syringe body. The medicinal solution channel hole in the needle seat assembly is deviated from the center axis of the needle seat assembly, that is, the plug.

9. The syringe with a self-destructing structure according to claim 5 or 6, wherein the needle bar in the needle bar assembly comprises a needle bar body in the middle, a handle at the rear end, and a connector at the front; The connector is connected to the needle bar body through a circular plate transversely positioned at the front end of the needle bar body. The connector is a type connector with a ladder-shaped head; the rear part of the needle bar hook in the needle bar assembly has a cylindrical body, and the rear part of the cylindrical body is inside the cylindrical body. It has a cavity, which is matched with the connector of the needle bar. The cavity is formed by a hole on the central axis and a hole penetrating through and perpendicular to the hole; the front part of the needle bar and the rear part of the hook of the needle bar The strong fitting connection structure is that the connector at the front of the needle bar is strongly inserted into the cavity of the cylinder at the rear of the needle bar hook. The neck size of the "T" connector is slightly smaller than the outer size of the hole in the cavity. The size of the hole in the cavity accommodates the ^ν τ "type connector head; the needle rod piston is a cylindrical body that matches the inner wall of the syringe. The needle rod piston has a cavity, and the cavity accommodates a cylinder at the rear of the needle rod hook. The back cylinder of the cavity and the above-mentioned needle bar hook The shape is the same, and it is also a cylinder. The bottom of the cavity has a through hole. The neck of the hook is connected to the front end of the cylinder through a cylindrical connection. The through hole corresponds to the square cylindrical connection. The depth is consistent with the height of the square-cylinder-shaped connecting portion and interference fit with each other.

10. The syringe with a self-destructing structure according to claim 1, 2, 3, 4, 5, or 6, wherein the cross-sectional shape of the inner wall of the syringe body is a uniform oval shape.

11. The syringe with a self-destructing structure according to claim 1, 2, 3, 4, 5, or 6, wherein the cross-sectional shape of the inner wall of the syringe body is an ellipse-like shape composed of four arcs.

12. The syringe with a self-destructing structure according to claim 1, 2, 3, 4, 5 or 6, wherein the cross-sectional shape of the inner wall of the syringe body is polygonal.