CN1323727C - Safety syringe - Google Patents

Abstract

A safety syringe, in order to provide a kind of reduction to assemble the procedure, make and assemble easy, fast, raise the apparatus that the medium input in vivo of the output, safe in utilization, propose the invention, it mainly will snap fit a unit cover in an injection tube, the snap fit unit has bush spare and direct shaping and seal element fixed on bush spare; the sleeve part is provided with an outer sleeve body and an inner sleeve body which is formed by extending a sealing element and is made of plastic elastic material, the inner ring surface of the inner sleeve body is provided with a first clamping part which is adjacent to the containing chamber and protrudes towards the axis and a containing part which corresponds to the through hole and is far away from the axis relative to the first clamping part, the sealing element is made of plastic elastic material, the outer diameter of the sealing element is larger than the outer diameter of the peripheral surface of the sleeve part, and the sealing element is sleeved in the injection cylinder in an airtight elastic manner.

Description

safety syringe

technical field

The invention belongs to a device for injecting a medium into the body, in particular to a safety syringe.

Background technique

As shown in Figures 1 and 2, a conventional safety syringe includes a syringe 1, an engaging seat 2 installed inside the syringe 1, a needle set 3 screwed to the engaging seat 2 and positioned in the syringe 1. Push the push rod 4.

The syringe 1 has a housing chamber 101 inside, a front hole 102 communicating with the housing chamber 101 and having a converging shape, and a shoulder 103 between the housing chamber 101 and the front hole 102 .

The engaging seat 2 has a disc seat 201 which can resist and be positioned on the shoulder 103 , a cylindrical part 202 protruding from one side of the disc seat 201 along the axis, and an O-ring 203 which can be sleeved on the cylindrical part 202 . A flange 204 protrudes toward the axis at one end of the inner ring surface of the cylindrical portion 202 , and a threaded portion 205 is provided at the other end.

The needle set 3 has a needle base 301 screwed on the threaded portion 205 and a needle body 302 fixed inside the needle base 301 .

The push rod 4 has an operable rod portion 401, a piston 402 disposed on the rod portion 401 that can be airtightly sleeved in the accommodating chamber 101, and a piston 402 disposed outside the piston 402 that can pass over the flange 204 and engage with the The tenons 403 for connecting the seats 2 to each other.

A notch 404 is formed in the center of the tenon 403 along the axis, so that the tenon 403 can be compressed and can automatically pop open after releasing the pressing force.

When the engaging seat 2 is inserted from the opening of the accommodation chamber 101, and the cylindrical portion 202 is inserted into the front end hole 102, and the disc seat 201 abuts against the shoulder 103, the push rod 4 can be inserted into the accommodation chamber 101 and aligned. The engaging seat 2 is resisted, but the tenon 403 cannot pass over the flange 204, so that the engaging seat 2 is positioned; then the needle seat 301 of the needle set 3 is screwed into the threaded part 205 from the front hole 102 of the syringe 1 , to complete the grouping operation.

Although the above-mentioned syringe can achieve the intended purpose of use, there are following deficiencies in manufacture and assembly:

1. The engaging seat 2 and the O-ring 203 are two components, which must be produced by two sets of equipment and need to be reassembled, which will increase the cost of manufacturing and assembling.

2. The O-ring 203 is small in size, and it is not easy to assemble it manually. If it is assembled by a machine, the O-ring 203 itself is elastic, so it is easy to break out during assembly, resulting in a high defect rate. And once the O-ring 203 breaks off and is stuck on the operating machine, it must be shut down for maintenance.

3. When assembling, it is necessary to insert the push rod 4 into the accommodation chamber 101 of the syringe 1 and position the engaging seat 2 against the positioning, so that the engaging seat 2 and the needle set 3 can be screwed and connected smoothly, and the assembling operation is quite cumbersome and Production capacity cannot be increased.

4. Using the O-ring 203 to be set on the engaging seat 2 will make the overall components more numerous, and in order to make the tenon 403 pass over the flange 204 smoothly, a slot 404 must be opened in the center of the tenon 403, and the structure is also more complicated. .

5. The engaging seat 2 and the needle seat 301 are two independent parts, which must be assembled to be connected and fixed. During assembly, the engaging seat 2 and the needle seat 301 must be rotated relative to each other so that the needle seat 301 can be smoothly Screwing it into the threaded portion 205 of the engaging seat 2 is a little cumbersome in operation.

Contents of the invention

The purpose of the present invention is to provide a safety syringe that reduces assembly procedures, is easy and fast to manufacture and assemble, improves production capacity, and is safe to use.

The present invention includes a syringe, an engaging seat unit installed inside the syringe, a needle unit connected to the engaging seat unit, and a push rod inserted inside the syringe; The tube part of the chamber and the beam tube part fixed at one end of the tube part and in the shape of a bundle, the inside of the tube part has a through hole that can communicate with the chamber and has a small aperture, and the connection between the through hole and the chamber is formed. Resisting part; the engaging seat unit is loaded into the injection barrel from the opening of the chamber opposite to the through hole and positioned on the abutting part, which has a sleeve part and a seal that is directly formed and fixed on the sleeve part , the sleeve has an outer body and an inner body extending from the sealing element and made of a plastic elastic material, the inner ring surface of the inner body has a first engaging portion adjacent to the chamber and protruding toward the axis and the accommodating part corresponding to the through hole, which is arranged on the side of the first engaging part and farther away from the axis than the first engaging part. It is arranged on the outer peripheral surface of the sleeve member, and the outer diameter of the sealing member is larger than the outer diameter of the corresponding outer peripheral surface of the sleeve member; the needle unit has a needle seat and a needle body fixed inside the needle seat, and the needle seat is connected and positioned on On the sleeve part of the snap seat unit; the push rod is inserted in the chamber of the injection cylinder, which has a rod, a piston arranged on the rod and airtightly sleeved in the chamber, and an outer side of the piston and The tenon positioned in the accommodating portion can be locked in time by passing over the first engaging portion.

in:

The sleeve part of the engaging seat unit is made of polypropylene, and the sealing part is made of rubber.

The inner ring surface of the inner casing of the engaging seat unit further has an inclined shoulder between the first engaging portion and the accommodating portion, and the first engaging portion is provided with an oblique hole formed around the oblique axis , the oblique axis intersects the axis at a predetermined angle, and the oblique axis intersects the oblique shoulder perpendicularly.

The outer body of the sleeve part of the engaging seat unit is made of polypropylene material, and the inner sleeve body is made of rubber material.

The inner casing of the engaging seat unit further has a guiding portion adjacent to the chamber and disposed on one side of the first engaging portion, the guiding portion is in the shape of a tapered hole.

The outer body of the engaging seat unit has several flow passages through which the plastic elastic material can flow so that the inner sleeve body and the sealing member are integrally formed, and several support blocks arranged between the flow passages.

The inner ring surface of the inner sleeve has a second engaging portion opposite to the first engaging portion and protruding toward the axis, and the accommodating portion is interposed between the first and second engaging portions; the needle of the needle unit The seat has a joint portion that can pass over the second engaging portion at an appropriate time and be locked and positioned in the accommodating portion.

A safety syringe, comprising a syringe, an engaging seat unit installed inside the syringe, a needle solidified inside the engaging seat unit, and a push rod inserted inside the syringe; the syringe has a The cylindrical part that can define the chamber and the bundled tube part that is fixed on one end of the cylindrical part and is in the shape of a bundle, the inside of the bundled tube part has a through hole that communicates with the chamber and has a smaller aperture, and the through hole is connected to the chamber A stopping part is formed at the joint; the engaging seat unit is loaded into the injection barrel from the opening of the chamber opposite to the through hole and positioned on the stopping part. The engaging seat unit has a sleeve part, which is directly molded and fixed on the sleeve The seal on the cylinder and the needle seat integrally formed with the sleeve, the sleeve has an outer peripheral surface formed around the axis and an inner ring opposite to the outer peripheral surface, the outer body and the seal are extended And the inner sleeve made of plastic elastic material, the inner ring surface of the sleeve member is the inner ring surface of the inner sleeve body, and the inner ring surface of the inner sleeve body has an engaging part adjacent to the chamber and protruding toward the axis and an accommodating part located on one side of the engaging part and farther away from the axis relative to the engaging part; the sealing part is made of a plastically elastic material, and is fixed on the outer peripheral surface of the sleeve part, and the sealing part The outer diameter is larger than the outer diameter of the corresponding sleeve part; the needle unit has a needle base and a needle body fixed inside the needle base; It has an operable rod part, a piston arranged on the rod part and airtightly sheathed in the chamber, and a tenon arranged outside the piston and capable of passing over the engaging part at a proper time and locked and positioned in the accommodating part.

The sleeve part of the engaging seat unit is made of polypropylene, and the sealing part is made of rubber.

The sleeve part of the engaging seat unit is made of polypropylene material, and the inner sleeve body is made of rubber material.

The outer body of the engaging seat unit has several flow passages through which the plastic elastic material can flow to form the inner casing, and several supporting blocks arranged between the flow passages.

The inner casing of the engaging seat unit further has a guiding portion adjacent to the chamber and disposed on one side of the engaging portion, the guiding portion is in the shape of a tapered hole.

The inner ring surface of the inner casing of the engaging seat unit further has an inclined shoulder between the engaging portion and the receiving portion. The engaging portion is provided with an oblique hole formed around the oblique axis. The oblique axis is aligned with the The axes intersect at a predetermined angle, and the oblique axis intersects the oblique shoulder perpendicularly.

Because the present invention is mainly to set an engaging seat unit inside an injection cylinder, the engaging seat unit has a sleeve part and a sealing part directly formed and fixed on the sleeve part; the sleeve part has an outer body and a The sealing element is extended and made of an inner casing made of plastic elastic material. The inner ring surface of the inner casing has a first engaging part adjacent to the chamber and protruding toward the axis, corresponding to the through hole and opposite to the first locking part. An engaging portion farther away from the accommodating portion of the axis, the sealing element is made of plastic and elastic material, and the outer diameter of the sealing element is larger than the outer diameter of the outer peripheral surface of the sleeve element, so that the sealing element is airtight and elastic Set in the syringe. When assembling, the needle unit and the locking seat unit can be connected as a whole; then, the locking seat unit and the needle unit are put into the injection barrel as a whole, when the sealing member of the locking seat unit is abutted against the stopper , then the snap seat unit and the needle unit can be positioned in the injection barrel; finally, just insert the end of the push rod with the piston and tenon into the injection barrel to complete the assembly; when the syringe is injected and is about to be discarded, operate The operator only needs to apply force and then push the push rod towards the inside of the injection barrel, so that the tenon can be easily forced and put into the accommodating part beyond the first engaging part, and the push rod and the engaging seat unit can achieve the purpose of connection; when the push rod When pulled towards the outside of the syringe, the push rod will drive the snap seat unit and the needle unit to retract toward the inside of the syringe until the needle body is hidden in the syringe, and the push rod can be broken to ensure that the needle body is not exposed and stabs the human body danger; the production and assembly of components is also quite easy, and the machine can be used for automatic operation and assembly, which reduces the cost of manufacturing and assembly. The defect rate is low, and the probability of machine shutdown is also low, which can improve production efficiency. The purpose of the present invention is achieved by reducing assembly procedures, making assembly easy and fast, improving production capacity, and using safely.

Description of drawings

Fig. 1 is a schematic perspective view of the exploded structure of a conventional safety syringe.

Fig. 2 is a schematic sectional view of a conventional safety syringe structure.

Fig. 3 is a schematic sectional view of an exploded structure of Embodiment 1 of the present invention.

Fig. 4 is a sectional view of A-A in Fig. 3 .

Fig. 5 is a schematic cross-sectional view of the structure of Embodiment 1 of the present invention.

FIG. 6 is a schematic diagram of the operation of Embodiment 1 of the present invention.

Fig. 7 is a schematic diagram 2 of the operation of the first embodiment of the present invention.

Fig. 8 is a schematic sectional view of the structure of Embodiment 2 of the present invention.

Fig. 9 is a schematic diagram of the operation of the second embodiment of the present invention.

Fig. 10 is a schematic sectional view of the third embodiment of the present invention.

Fig. 11 is a schematic sectional view of the fourth embodiment of the present invention.

Detailed ways

Embodiment one

As shown in Fig. 3, Fig. 4 and Fig. 5, the present invention includes a syringe 10, an engaging seat unit 20 installed inside the syringe 10, a needle unit 30 embedded and fixed in the engaging seat unit 20, and a The plunger 40 is inserted in the syringe 10 in a sliding manner.

The syringe 10 is made into a hollow cylinder, has a cylinder portion 11 that surrounds the axis L and can define a chamber 111, and a bundle tube portion 12 that is fixed at one end of the cylinder portion 11 and is in a constricted shape. The inside of the bundle tube portion 12 There is a through hole 121 which can communicate with the chamber 111 and has a smaller aperture, and the connection between the through hole 121 and the chamber 111 produces a stop portion 13 and an annular groove 14 .

The engaging seat unit 20 is made into a step-by-step hollow column, and is loaded into the injection barrel 10 from the opening of the chamber 111 opposite to the through hole 121, and has a sleeve part 21 and a sleeve part 21 which is directly formed and fixed on the sleeve part 21. Seal 22. The sleeve member 21 has an outer casing 23 made of a hard plastic material (the present embodiment may be abbreviated as PP polypropylene material) and is fixed inside the outer casing 23 and is made of a plastic elastic material (the present embodiment may use rubber) Material) made of the inner casing 24, the outer casing 23 has a disk portion 231 that can be resisted on the stop portion 13, a circular tube portion 232 that is protruding from one side of the disk portion 231 and has a smaller diameter, surrounds The axis L corresponds to the outer peripheral surface 233 of the disk portion 231 and the inner peripheral surface 234 opposite to the outer peripheral surface 233. The disk portion 231 is provided with several flow channels 235 extending in the radial direction and between the several flow channels 235. Several support blocks 236 between. The inner casing 24 is integrally formed extending inwardly from the seal 22 through the conduction of the flow channel 235 , and has an inner ring surface 241 formed around the axis L. The inner ring surface 241 is adjacent to the chamber 111 and faces the axis L. The protruding first engaging portion 242, the second engaging portion 243 disposed opposite to the first engaging portion 242 and protruding toward the axis L, is interposed between the first and second engaging portions 242, 243 and The accommodating portion 244 farther away from the axis L, the abutting shoulder 245 provided at the connection between the first engaging portion 242 and the accommodating portion 244 , and the shoulder portion 245 adjacent to the chamber 111 and disposed on the side of the first engaging portion 242 The guide part 246 is in the shape of a tapered hole. The sealing member 22 is made of a plastic elastic material (rubber in this embodiment), and is directly poured on the disk portion 231 of the outer casing 23, and is connected with the disk portion 231 and the inner casing body 24 by using the flow channel 235. A better consolidation effect is produced, and the use of the support block 236 can make the inner casing 24 have better positioning. And its outer ring part can protrude on the outer peripheral surface 233, and the inner ring part is connected with the inner sleeve body 24 as a whole, and the outer diameter D of the sealing member 22 is larger than the outer diameter of the outer peripheral surface 233 of the corresponding outer sleeve body 23 d.

The needle unit 30 has a needle base 31 , a needle body 32 fixed inside the needle base 31 , and a cover 33 sleeved on the needle base 31 and capable of covering the outside of the needle body 32 .

The outer peripheral surface of the needle holder 31 has a connecting portion 311 that can be inserted into the through hole 121 and can pass over the second engaging portion 243 and connect to the positioning accommodating portion 244, and can be abutted against the outer end surface of the round tube portion 232 and can be used for a cover. 33 against the snap ring 312 positioned.

The push rod 40 is inserted in the chamber 111 of the syringe 10, and has an operable rod portion 41, a piston 42 arranged at one end of the rod portion 41 and can be airtightly sleeved in the chamber 111, and The tenon 43 disposed in the outer side of the piston 42 and capable of crossing over the first engaging portion 242 and locking in the accommodating portion 244 in good time. The minimum outer diameter of the tenon 43 is also greater than the inner diameter formed by the first engaging portion 242, and utilizing the material properties of the inner casing 24, when the tenon 43 passes through the first engaging portion 242, it can engage with the seat unit 20 achieve a solid connection.

As shown in Figure 5, when assembling, the connecting part 311 of the needle unit 30 can be inserted from the port of the round tube part 232 of the engaging seat unit 20, and the material properties of the inner sleeve body 24 are used to make the connecting part 311 very easy. Then the second engaging portion 243 can be forced to pass over, and the needle unit 30 can be integrated with the engaging seat unit 20 . Then, insert the engaging seat unit 20 and the needle unit 30 covered with the cover 33 from the open end of the chamber 111 so that the whole is put into the syringe 10, and make the direction of the needle 32 and the cover 33 opposite to each other. According to the through hole 121 , when the sealing member 22 is nested inside the ring groove 14 and the plate portion 231 abuts against the abutting portion 13 , the engaging seat unit 20 and the needle unit 30 can be positioned in the syringe 10 . Finally, just insert the end of the push rod 40 provided with the piston 42 and tenon 43 into the chamber 111 to complete the assembly, and the above-mentioned assembly can be assembled by automatic machine operation, and the seal 22 does not have a sleeve. There is a risk of separation of the barrel 21.

As shown in Figure 6, when the syringe is injected and is about to be discarded, the operator only needs to apply force and then push the push rod 40 toward the inside of the syringe 10. By using the material properties of the inner sleeve 24, the tenon 43 can be easily forced. And go over the first engaging portion 242 , and make the tenon 43 drop into the accommodating portion 244 , so that the push rod 40 can be connected with the engaging seat unit 20 . As shown in Figure 7, when the push rod 40 is pulled toward the outside of the syringe 10, the push rod 40 can drive the engaging seat unit 20 and the needle unit 30 to move toward the inside of the syringe 10 until the needle body 32, the cover body When all 33 have been hidden in the syringe 10, the push rod 40 can be broken off, which can ensure that the needle body 32 does not have the danger of being exposed and stabbing the human body. Therefore, the syringe of the first embodiment of the present invention has the following advantages:

1. The sealing member 22 and the sleeve member 21 are directly molded on the same component, manufactured by the same machine, and do not need to be reassembled, which can reduce the cost of manufacturing and assembling.

2. The sealing element 22 is formed directly on the sleeve element 21, so there is no assembly problem, and the cost of manual assembly can be saved, and the machine can be used for the overall assembly operation, so the sealing element 22 will not jump out. The defect rate is low, and the probability of machine downtime is also low, which can improve production efficiency.

3. When assembling, connect the engaging seat unit 20 and the needle unit 30 in advance, and then put the engaging seat unit 20 and the needle unit 30 into the syringe 10 until they are positioned. The assembly operation is quite easy and the assembly speed is fast , Production capacity can be greatly improved.

4. The sealing member 22 is directly formed on the sleeve member 21, which can simplify the components, and utilize the material properties of the inner sleeve body 24. The tenon 43 does not need to be opened with a slot, and the structure is relatively simple, and can be used on the same machine. At the same time, complete the assembly work with the same operation action.

5. As shown in Figure 4, the outer casing 23 made of polypropylene and the support block 236 can be used to support the inner casing 24 and the seal 22 made of rubber, so that the tenon 43 of the push rod 40 is engaged with the When the seat unit 20 is nested, it can achieve the purpose of stable combination and urgent tightening.

Embodiment two

As shown in FIG. 8 , the safety syringe of the present invention is substantially the same as that of the first embodiment, the difference lies in that the inner ring surface 241 ′ of the inner sleeve body 24 ′ of the engaging seat unit 20 ′ has an intervening first engaging portion 242 ’ and the accommodating portion 244 ′, which is an inclined shoulder 245 ′, and the first engaging portion 242 ′ is provided with an oblique hole 247 ′ formed around the oblique axis L ′, and the oblique axis L ′ and the axis L The intersection is about 20°, and the oblique axis L' intersects the oblique shoulder 245' perpendicularly. As shown in Figure 9, when the push rod 40 is connected to the engaging seat unit 20' by the tenon 43, due to the setting of the inclined hole 247', the tenon 43 will exert a unilateral outward extrusion effect on the inner casing 24' At the same time, because the sealing member 22' is restricted by the injection cylinder 10, when the operating push rod 40 moves toward the outside of the injection cylinder 10 (the cover can be removed first), the original unilateral outward pressure is released. In addition, using the material characteristics of the inner sleeve body 24' and the effects of the inclined hole 247' and the inclined shoulder 245', the engaging seat unit 20' and the needle body 32 of the needle unit 30 can be retracted into the syringe 10, It will be deflected as a whole (at this time, the oblique hole 427' will be deformed by the extrusion of the tenon 43 and shaped by the tenon 43), and the tip of the needle body 32 can be abutted against the stopper 13, and then broken and pushed. Rod 40, just can guarantee that needle body 32 does not have the danger of being exposed.

Embodiment Three

As shown in Figure 10, the present invention includes a syringe 10", an engaging seat unit 20" installed inside the syringe 10", a needle body 30" fixed in the engaging seat unit 20", and a movable Insert the push rod 40 "inside the syringe 10 ". The structure of the syringe 10 " and the push rod 40 " is exactly the same as that of the first embodiment, so it will not be described in detail. The following is only for the engaging seat unit 20 "And the needle body 30" description:

The engaging seat unit 20 ″ has a sleeve member 21 ″, a sealing member 22 ″ directly formed and fixed on the sleeve member 21 ″, and a needle seat 25 ″ integrally formed with the sleeve member 21 ″. The sleeve part 21 "has an outer casing 23" made of a hard plastic material and an inner casing 24" fixed inside the outer casing 23" and made of a plastically elastic material. The outer casing 23" has a The disc part 231 "stopped on the stop part 13 ", the circular tube part 232 " protruding from the side of the disc part 231 " and having a smaller diameter, surrounding the axis L and corresponding to the outer peripheral surface 233 " of the disc part 231 " and The inner peripheral surface 234 ″ is set opposite to the outer peripheral surface 233 ″, and the disk part 231 ″ is preset with several flow channels 235 ″ in the radial direction. The inner sleeve body 24 ″ has an inner annular surface 241 ″ formed around the axis L, The inner annular surface 241" has an engaging portion 242" that is adjacent to the chamber 111" and protrudes toward the axis L, and is located on one side of the engaging portion 242" and is farther away from the engaging portion 242" than the accommodating portion 242" of the axis L. Section 244″.

The sealing member 22" is made of rubber material, and is directly poured into the flow channel 235", and its outer ring part can be protruded on the outer peripheral surface 233", while the inner ring part is connected with the inner sleeve body 24". And the outer diameter of the sealing member 22" is greater than the outer diameter of the corresponding outer peripheral surface 233" of the outer casing 23".

The needle body 30 ″ is directly fixed in the needle seat 25 ″ of the engaging seat unit 20 ″, and can protrude to the outside of the syringe 10 ″.

Therefore, the third embodiment of the present invention integrates the sleeve member 21", the sealing member 22" and the needle seat 25", which not only reduces the number of components, but also reduces the trouble of manufacturing and assembling, and only needs to be assembled The needle body 30" is inserted and fixed inside the needle seat 25" to complete the assembly, which is quite easy to operate. Compared with the existing syringes, the existing syringe needle seat needs to be rotated relative to the engaging seat to be screwed together. The invention has indeed achieved the purpose of reducing components and assembling procedures.

Embodiment four

As shown in FIG. 11 , the present invention is substantially the same as the third embodiment, the difference being that the inner ring surface 541 of the inner sleeve body 54 of the engaging seat unit 50 also has a The inclined shoulder 545 is inclined, and the engaging portion 542 is provided with an inclined hole 547 formed around the inclined axis L′, and the inclined axis L′ is perpendicular to the inclined shoulder 545 . When the engaging seat unit 50 and the needle body 60 are retracted into the interior of the syringe, it can also ensure that the needle body 60 is not in danger of being exposed (similar to the state shown in FIG. 9 ).

To sum up the above, the safety syringe of the present invention directly consolidates the plastically elastic seal and the sleeve into one body, which not only achieves the purpose of sealing, but also achieves the effects of easy manufacturing and assembly, increased production capacity, and reduced costs. Reach the object of the present invention.

Claims (13)

1, a kind of safety injector, include injection tube, be installed in injection tube inside clamping base unit, be attached at the needle unit on the clamping base unit and be plugged in the push rod of injection tube inside; Injection tube has around axis and can define the tube portion of room and be fixed in a portion one end and be the beam tube portion of bringing shape together, and beam tube portion inside has the perforation that can communicate and have smaller aperture due with room, and perforation and room joining place generation stop section; Clamping base unit is to be the opposite room opening injection tube of packing into inner and be positioned on the stop section with perforation, it has sleeve member and straight forming and is installed in sealing member on the sleeve member, sleeve member has the outer peripheral face that produces around axis and reaches the inner ring surface that is opposing setting with outer peripheral face, inner ring surface has first holding section and holding part, sealing member is can plasto elastic material make than the sleeve member tool, and be installed on the outer peripheral face of sleeve member, and the external diameter of sealing member is greater than the external diameter of pairing sleeve member outer peripheral face; Needle unit has needle stand and is installed in the needle body of needle stand inside, and the needle stand binding is positioned on the sleeve member of clamping base unit; Push rod is plugged in the room of injection tube, and it has bar portion, be arranged in the bar portion and airtightly be set in the piston in the room and be located at the piston outside and can cross first holding section and be located in tenon in the holding part; The sleeve member that it is characterized in that described clamping base unit has outer sleeve body and is extended the interior body that forms and make with the plastic elastic material of tool by sealing member, the inner ring surface of sleeve member is the inner ring surface of interior body, the inner ring surface of body in first holding section is arranged at, and be adjacent to room and protrude towards axis; Holding part is located at first holding section, one side and is away from axis with respect to first holding section corresponding to perforation.

2, safety injector according to claim 1, the sleeve member that it is characterized in that described clamping base unit are to make with the polypropylene material, and sealing member is to make with the rubber material.

3, safety injector according to claim 1, the interior body inner ring surface that it is characterized in that described clamping base unit has more between first holding section and holding part and is skewed inclination shoulder, be provided with the inclined hole that produces around oblique axis in first holding section, oblique axis and axes intersect have predetermined angular, and oblique axis and inclination shoulder intersect vertically.

4, safety injector according to claim 1, the sleeve member outer sleeve body that it is characterized in that described clamping base unit is to make with the polypropylene material, interior body is to make with the rubber material.

5, safety injector according to claim 1 is characterized in that the interior body of described clamping base unit has more the guidance part that is adjacent to room and is located at first holding section, one side, and guidance part is the taper hole shape.

6, safety injector according to claim 1, the outer sleeve body that it is characterized in that described clamping base unit have can for plastic flow of elastomeric materials pass to make in body and integrated several runners of sealing member and be arranged on several piece back-up block between the runner.

7, safety injector according to claim 1 is characterized in that the inner ring surface of described interior body has second holding section that is opposite setting and protrudes towards axis with first holding section, and makes holding part between first and second holding section; The needle stand of needle unit has can be crossed second holding section and be located in joint portion in the holding part.

8, a kind of safety injector, include injection tube, be installed in injection tube inside clamping base unit, be cemented in the needle body of clamping base unit inside and be plugged in the push rod of injection tube inside; Injection tube has around axis and can define the tube portion of room and be fixed in a portion one end and be the beam tube portion of bringing shape together, and beam tube portion inside has the perforation that communicates and have smaller aperture due with room, and perforation and room joining place generation stop section; Clamping base unit is to be the opposite room opening injection tube of packing into inner and be positioned on the stop section with perforation, clamping base unit has sleeve member and straight forming and is installed in sealing member on the sleeve member, sleeve member has the outer peripheral face that produces around axis and reaches the inner ring surface that is opposing setting with outer peripheral face, and inner ring surface has holding section and holding part; Sealing member is can plasto elastic material to make with tool, and is installed on the outer peripheral face of sleeve member, and the external diameter of sealing member is greater than the external diameter of pairing sleeve member outer peripheral face; Needle unit has needle stand and is installed in the needle body of needle stand inside; Push rod is to be to be plugged in the room of injection tube with passing, and it has can be for the bar portion of operation, be arranged in the bar portion and airtightly be set in the piston in the room and be located at the piston outside and can cross the holding section and be located in tenon in the holding part; It is characterized in that described needle stand and sleeve member are one-body molded; The sleeve member of clamping base unit has outer sleeve body and extends the interior body form and to make with the plastic elastic material of tool by sealing member, and the inner ring surface of sleeve member is the inner ring surface of interior body; The inner ring surface of body in the holding section is arranged at, and be adjacent to room and protrude towards axis; Holding part is located at holding section one side and is away from axis with respect to the holding section.

9, safety injector according to claim 8, the sleeve member that it is characterized in that described clamping base unit are to make with the polypropylene material, and sealing member is to make with the rubber material.

10, safety injector according to claim 8, the sleeve member that it is characterized in that described clamping base unit are to make with the polypropylene material, and interior body is to make with the rubber material.

11, safety injector according to claim 8, the outer sleeve body that it is characterized in that described clamping base unit have can for plastic flow of elastomeric materials pass to form in body several runners and be arranged on several piece back-up block between the runner.

12, safety injector according to claim 8 is characterized in that the interior body of described clamping base unit has more the guidance part that is adjacent to room and is located at holding section one side, and guidance part is the taper hole shape.

13, safety injector according to claim 8, the interior body inner ring surface that it is characterized in that described clamping base unit has more between holding section and holding part and is skewed inclination shoulder, be provided with the inclined hole that produces around oblique axis in the holding section, oblique axis and axes intersect have predetermined angular, and oblique axis and inclination shoulder intersect vertically.

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