CN104056330B - Protective devices for injection needles - Google Patents

Abstract

A protection device of a syringe needle device comprises a needle seat connected with the syringe needle device and allowing a needle body to penetrate out, a sleeve pipe group connected with the needle seat, a movable sleeve pipe capable of moving and penetrating in the sleeve pipe group, an elastic element penetrating in the sleeve pipe group and acting on the movable sleeve pipe, and a stop component for stopping the movable sleeve pipe from moving only in the sleeve pipe group. During the injection, the movable sleeve can move in the direction opposite to the needle seat by the elastic force of the elastic element after being separated from the stop component, and the two stop surfaces of the movable sleeve are respectively blocked by the two step surfaces of the sleeve set, so that the movable sleeve completely covers the needle body and cannot move along the axial direction. Therefore, by utilizing the special position relation among the step surface, the clamping surface and the stopping piece, the needle body is automatically hidden after the injection is finished, the assembly and the structure can be simplified, and the smoothness, the safety and the practicability of the medical clinical injection operation can be improved.

Description

Protective devices for injection needles

technical field

The invention relates to an injection needle, in particular to a protection device for an injection needle capable of hiding a needle body.

Background technique

Referring to Fig. 1 and Fig. 2, taking the injection needle device 1 of US Pat. A needle base 12 at the front end, a needle body 13 connected with the needle base 12 and extending along an axis X direction, an isolation tube 14 connected with the needle base 12 and surrounding the needle body 13, and the needle base 12 An inner tube 15 and an outer tube 16 connected to and surround the isolation tube 14 , an elastic element 17 passing through the isolation tube 14 and the inner tube 15 , a sleeve 18 , and a stopper 19 . The inner tube 15 has a small-diameter section 151 that shrinks inwardly. The outer tube 16 has a rim 161 spaced from the small diameter section 151 by a distance. The sleeve 18 has a first stop surface 181 opposite to the small-diameter section 151 , and a second stop surface 182 facing the ring 161 . The stopper 19 has an end surface 191 against the first stop surface 181 , and a concave portion 194 formed between the two inclined surfaces 192 , 193 and slidingly engaged with the small-diameter section 151 .

Before the injection needle 1 performs the injection procedure, the elastic member 17 will push the sleeve 18 to be blocked by the second stop surface 182 on the rim 161 of the outer tube 16, and the inner tube 15 will be blocked by the second stop surface 182. The small-diameter section 151 is stuck against the recess 194 of the stopper 19, so that the stopper 19 is positioned, and the first stop surface 181 of the sleeve 18 is limited by the end surface 191, thereby, the sleeve 18 Get positioned.

When the injection needle 1 performs an injection procedure, the cannula 18 will press the stopper 19 due to the reaction force when it contacts the patient, so that the stopper 19 pushes the small diameter section 151 against the inclined surface 193 to expand the caliber The first blocking surface 181 of the cannula 18 is allowed to pass through, whereby the cannula 18 will cooperate with the needle body 13 to penetrate into the patient and go deep into the inner tube 15 . When the injection is completed and the needle body 13 is withdrawn from the patient, the elastic element 17 will push the sleeve 18 to move away from the needle hub 12 until the first stop surface 181 and the second stop surface 182 are respectively Limited to the small-diameter section 151 and the ring 161 , the sleeve 18 cannot be displaced due to the loss of the guiding function of the stopper 19 and covers the needle body 13 .

However, although the aforementioned structure can achieve the purpose of isolating the needle body 13 after use, it uses four pipe fittings such as the isolation tube 14, the inner tube 15, the outer tube 16, and the sleeve tube 18. Not only are there many components, the cost is high, and the The stopper 19 must be accommodated between the inner tube 15 and the isolating tube 14, and the plastic variable space of the small-diameter section 151 is preset, so there are disadvantages such as the gap is too large, and the sleeve 18 is easy to shake. Furthermore, if the elastoplasticity of the small-diameter section 151 is too large, it will hinder the shrinkage of the sleeve 18; if the elastoplasticity is too small, the sleeve 18 cannot be effectively blocked, and the needle 13 will still be exposed, There is still room for improvement in terms of security.

Contents of the invention

The purpose of the present invention is to provide a protective device for injection needles that can simplify components and structures, and improve smooth operation and practicability.

The injection needle has a tube and a needle connected to the tube along an axial direction. The protection device of the present invention includes a needle seat, a sleeve set, a movable sleeve, an elastic element, and a stopper. pieces. The needle base is connected with the tube and allows the needle body to pass through. The sleeve set is connected with the needle base, and has a first annular surface and a second annular surface surrounding the axis and defining an annular groove, and are respectively formed on the first annular surface and the second annular surface and Reverse two-step surface. The movable sleeve is passed through the ring groove, and has a locking surface formed on an inner surface and another locking surface formed on an outer surface. The elastic element is inserted in the ring groove and acts on the movable sleeve. The stopper is inserted between the annular grooves of the first annulus and the second annulus along the direction perpendicular to the axis, so that the movable sleeve is fastened to the stopper, and can follow an external force. The annular groove is displaced toward the direction of the needle seat, and pushes the stopper out of the annular groove, so that the movable sleeve is displaced in the direction opposite to the needle seat by the elastic force of the elastic element, until the aforementioned stop The stop surfaces respectively abut against the aforementioned stepped surfaces and completely cover the needle body, and are blocked by the aforementioned stepped surfaces so as to be unable to move along the axis direction.

In the protective device for injection needles according to the present invention, the sleeve set has an inner sleeve and an outer sleeve surrounding the axis and defining the annular groove, the first annular surface and the second annular surface are respectively formed on The inner sleeve has an outer surface and the outer sleeve has an inner surface.

In the protective device for injection needles according to the present invention, the movable sleeve also has two first recesses formed on the inner surface by utilizing the change of the toroidal potential difference, and the aforementioned first recesses respectively provide the stopper, the inner sleeve There is an accommodating space on the pipe step surface.

In the protective device for injection needles according to the present invention, the movable sleeve also has a second concave portion formed on the outer surface by utilizing the difference in the level difference of the torus, and the second concave portion provides an accommodating space on the stepped surface of the outer sleeve.

In the protective device for injection needles according to the present invention, the change in the level difference of the annulus is formed by utilizing the high and low level differences of the curved surface to form the first concave portion and the second concave portion.

In the protective device for injection needles according to the present invention, the inner sleeve has a piercing opening perpendicular to the axial direction, and a part of the piercing opening is formed on an inner surface along the axial direction and has a plane end edge exposed A rib, the stopper is inserted into the opening along the direction perpendicular to the axis and mounted on the planar end edge of the rib, and is mutually blocked by the elastic force of the elastic element and the locking surface of the inner surface of the movable sleeve , and stably fix the movable sleeve.

In the protective device for injection needles according to the present invention, the movable sleeve also has a convex portion formed between the aforementioned first concave portions, and the stopper has a slope formed at one end, and a slope adjacent to the slope. A limiting surface, the inclined surface extends from one end away from the needle base and close to the axis to the other end adjacent to the needle base and away from the axis, so that the stopper is affected by the movement as the movable sleeve goes deep into the annular groove. The convex part of the sleeve is squeezed, and then moves into the opening of the inner sleeve, and breaks away from the ring groove until it is blocked by the rib, and the limiting surface and the locking surface of the inner surface of the movable sleeve face each other.

In the protection device for injection needles according to the present invention, the protection device further includes a sleeve cover, which is socketed with the outer sleeve, and closes the movable sleeve and the needle body.

In the protective device for injection needles according to the present invention, at least one of the inner sleeve and the outer sleeve further has several split grooves extending along the axial direction from the end far away from the needle hub.

In the protective device for injection needles according to the present invention, the needle body is directly connected to the needle seat, and the needle seat is sleeved with the pipe member.

In the protection device for injection needles according to the present invention, the needle body is directly connected to the tube, and the needle seat is sleeved on the tube.

In the protective device for injection needles according to the present invention, the needle base has several mating parts formed on an outer surface, and the sleeve set also has a second inner surface formed on the inner sleeve, and a second There are several engaging parts on at least one of the two annular surfaces. The aforementioned engaging parts and the mating parts of the needle hub engage with each other so that the sleeve set cannot rotate relative to the needle hub. The aforementioned mating parts can be concave Grooves, convex ribs, and a combination of these, and the aforementioned engaging portion can be convex ribs, concave grooves, and a combination of these in conjunction with the mating portion.

In the protective device for injection needles according to the present invention, the needle base also has a protruding ring formed on the front end, a stop ring adjacent to a rear end, and a stop ring adjacent to the middle part formed between the protruding ring and the A ring edge between the stop rings, and the inner sleeve also has a concave ring formed on the inner surface opposite the convex ring and engaged with the convex ring, and the outer sleeve also has a concave ring formed against the stop ring One end of the ring and a barb that hooks into the ring.

The beneficial effect of the present invention is that: by utilizing the special positional relationship between the above-mentioned stepped surface, the locking surface, and the stopper, the present invention can automatically hide the needle body after the injection is completed, which not only can simplify the assembly and structure, but also can improve the The smoothness, safety and practicality of medical clinical injection operations.

Description of drawings

Fig. 1 is the cross-sectional view illustrating No. 8,162,883 of U.S. Patent;

Fig. 2 is a sectional view illustrating that the sleeve pipe cannot be displaced in the aforementioned U.S. Patent No. 8,162,883 case;

3 is a sectional exploded view illustrating a first preferred embodiment of a protective device and a syringe of the present invention;

Fig. 4 is a three-dimensional exploded view of the first preferred embodiment;

Fig. 5 is a three-dimensional sectional view of the first preferred embodiment;

Fig. 6 is a sectional view illustrating the state before the injection procedure of the first preferred embodiment;

Fig. 7 is a partial enlarged view of Fig. 6;

Fig. 8 is a cross-sectional view illustrating a state of performing an injection procedure in the first preferred embodiment;

Fig. 9 is a sectional view illustrating the state after the injection procedure of the first preferred embodiment;

Fig. 10 is a partial enlarged view of Fig. 9;

Fig. 11 is a sectional view illustrating a second preferred embodiment of a protective device and an injection needle of the present invention;

Fig. 12 is a sectional view illustrating the state after the injection procedure of the second preferred embodiment;

13 is a cross-sectional view illustrating a third preferred embodiment of a protective device and an injection needle of the present invention;

Fig. 14 is a cross-sectional view illustrating the state of the injection procedure of the third preferred embodiment;

Fig. 15 is a sectional view illustrating the state after the injection procedure of the third preferred embodiment;

Fig. 16 is a cross-sectional exploded view illustrating a fourth preferred embodiment of a protective device and a syringe of the present invention;

Fig. 17 is a sectional view of the fourth preferred embodiment;

Fig. 18 is a sectional exploded view illustrating a fifth preferred embodiment of a protective device and a syringe of the present invention; and

Fig. 19 is a sectional view of the fifth preferred embodiment.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

Referring to FIG. 3 , FIG. 4 , and FIG. 5 , FIG. 6 , a first preferred embodiment of the protective device of the present invention is installed on an injection needle 2 . The injection needle 2 has a tube 20 , a push rod set 21 that airtightly slides with the tube 20 and is used to push the liquid medicine, and a needle body 23 that extends along an axis X and communicates with the tube 20 . The protective device includes a needle base 22 , a sleeve set 3 , a movable sleeve 4 , an elastic element 5 , a stopper 6 , an end cover 7 and a sleeve cover 8 .

The needle base 22 is connected with the needle body 23 in this preferred embodiment, and is detachably socketed with the pipe member 20, and has a ring 220 formed on an outer surface and adjacent to the middle part, formed on a front end Several abutting portions 221, 222 of the rim 220, a plurality of bridging bridges 223 protruding from the outer surface and located between the rim 220 and the abutting portion 221 of the front end, formed between the rim 220 and a rear A stop ring 224 between the ends and having a diameter larger than the ring 220 , a stepped surface 225 formed between the front end and the bridge 223 , and a protruding ring 226 formed at the front end. The aforesaid mating portions 221 and 222 can be concave grooves or convex ribs, or as shown in this preferred embodiment, both include concave grooves and convex ribs.

The cannula set 3 is detachably fitted on the hub 22 and has an inner cannula 31 and an outer cannula 32 surrounding the axis X.

The inner sleeve 31 fits with the needle hub 22 until one end abuts against the stepped surface 225, and has two split grooves 311 extending from the end away from the needle hub 22 along the axis X direction and corresponding to each other, formed on an outer A first annular surface 312 on the surface, a stepped surface 313 formed on the first annular surface 312 and facing the needle seat 22, at least one through hole 314 penetrating along the direction perpendicular to the axis X and located between the aforementioned split grooves 311, At least one rib 315 formed on an inner surface along the axis X direction and having a planar end edge 318 exposed in a part of the through opening 314 is formed on the inner surface opposite to the aforementioned mating portion 221 and interacts with the mating portion 221 respectively. Several engaging portions 316 are engaged, and a concave ring 317 is formed on the inner surface opposite to the protruding ring 226 and engaged with the protruding ring 226 . The engaging portion 316 and the mating portion 221 can be convex ribs or grooves, so that the inner sleeve 31 cannot rotate relative to the needle hub 22 . The rib 315 can be formed by extending at least one engaging portion 316 .

The outer sleeve 32 fits on the needle hub 22, and has a barb 320 formed at one end abutting against the stop ring 224 and hooked with the ring 220, along the axis from the end away from the needle hub 22 Two split grooves 321 extending in the X direction and opposite to the aforementioned split grooves 311, a second ring surface 322 formed on an inner surface and defining a ring groove 30 with the first ring surface 312, and a second ring surface 322 formed on the second ring surface 322 And a step surface 323 facing away from the needle hub 22 , and a plurality of engaging portions 324 formed on an inner surface opposite to the engaging portion 222 and engaging with the engaging portion 222 respectively. The engaging portion 324 and the mating portion 222 can be convex ribs or grooves, so that the outer sleeve 32 cannot rotate relative to the needle hub 22 .

The movable sleeve 4 is displaceably inserted in the annular groove 30, and has two locking surfaces 41, 42, 41, 42, 42 formed on an inner surface and an outer surface oppositely and facing the aforementioned step surfaces 313, 323 respectively. Formed on the inner surface and using a curved surface to form a convex portion 43 with high and low toroidal level difference changes and two first concave portions 44, 45 located on both sides of the convex portion 43, and formed on the outer surface and also using a curved surface A second recess 46 is formed with high and low toroidal level variations. The aforementioned first recesses 44 , 45 respectively provide an accommodating space for the stopper 6 and the stepped surface 313 of the inner sleeve 31 . The second concave portion 46 provides an accommodating space for the stepped surface 323 of the outer sleeve 32 .

The elastic element 5 is inserted in the annular groove 30 and is partially sleeved on the bridging bridge 223 of the needle hub 22 , and acts on the movable sleeve 4 .

The stopper 6 has an inclined surface 61 formed at one end, and a restricting surface 62 adjacent to the inclined surface 61 and capable of being accommodated between the first recesses 44 . The slope 61 extends from one end away from the needle hub 22 and close to the axis X to the other end adjacent to the needle hub 22 and away from the axis X. As shown in FIG. It is worth mentioning that, during assembly, the stopper 6 is inserted into the opening 314 through the gap between the opening 314 and the rib 315 along the direction perpendicular to the axis X, and rests on the plane end edge of the rib 315 318, or the restricting surface 62 protrudes into the annular groove 30 and engages with the locking surface 41, and is subjected to the elastic force of the elastic element 5 to interact with the locking surface 41 of the movable sleeve 4 stop, and be stable at a first position (as shown in Fig. 6 and Fig. 7) of clamping the movable sleeve 4, in addition, the stopper 6 can also go deep into the annular groove 30 with the movable sleeve 4, Squeezed by the protrusion 43 of the movable sleeve 4, it is displaced along the opening 314 to be blocked by the rib 315, so that the restricting surface 62 is separated from the annular groove 30 and stabilized on a first part of the movable sleeve 4. Two positions (as shown in Figure 9 and Figure 10).

The end cap 7 closes an end of the movable sleeve 4 opposite to the needle hub 22 , and has a through hole 71 extending along the axis X for the needle body 23 to pass through.

The sleeve cover 8 is sleeved with an end of the outer sleeve 32 of the sleeve set 3 opposite to the needle hub 22 , and closes the movable sleeve 4 and the needle body 23 .

When assembling, it is only necessary to fit the inner sleeve 31 and the needle hub 22 first, make the inner sleeve 31 fasten with the concave ring 317 and the convex ring 226 of the needle hub 22, and then pass the stopper 6 through. Put it into the opening 314 of the inner sleeve 31, and then fit the outer sleeve 32 and the needle hub 22 so that the outer sleeve 32 buckles the ring 220 of the needle hub with the barb 320. At this time, The inner sleeve 31 and the outer sleeve 32 combined with the needle hub 22 form an annular groove 30 for the elastic element 5 to pass through, and then the elastic element 5 and the movable sleeve 4 are inserted into the aforementioned annular groove 30 , so that the movable sleeve 4 utilizes the elastoplasticity formed by the groove 311 of the inner sleeve 31 and the groove 321 of the outer sleeve 32 to smoothly follow the circular groove 30 and move toward the direction of the needle hub 22, while the elastic element 5. Squeeze and store the elastic force of the elastic element 5. After the locking surface 41 passes through the stopper 6, use a jig (not shown) to penetrate into the inner sleeve 31 and push the stopper. When the element 6 is displaced in the direction away from the axis X, the movable sleeve 4 can be pushed by the elastic element 5 and displaced in the direction opposite to the needle seat 22 without external force, until the locking surface 41 is blocked. Positioning is obtained behind the limiting surface 62 of the stopper 6. At this time, the stopper 6 will be indirectly pushed up by the elastic force of the elastic element 5, and will be pushed to the top with the locking surface 41 of the movable sleeve 4. It is worth noting that the needle body 23 can pass through the inner sleeve along the axis X after the aforementioned stopper 6 clamps the movable sleeve 4 31 and connect with the needle base 22, or connect the needle body 23 and the needle base 22 before fitting the inner sleeve 31 and the needle base 22, and finally, close the movable sleeve with the end cap 7 4. Put the sleeve cover 8 and the outer sleeve 32 together again to complete the assembly.

Referring to Fig. 6 and Fig. 7, it is worth mentioning that since the first recesses 44, 45 and the second recess 46 of the movable sleeve 4 respectively form the slope 61 for the stopper 6, the inner sleeve 31 The step surface 313 of the outer sleeve 32 and the step surface 323 of the outer sleeve 32 accommodate the space, therefore, the resistance when the movable sleeve 4 is displaced can be reduced, and the smoothness of the movement can be improved.

Referring to Fig. 6, Fig. 7 and Fig. 8, before the injection needle 2 performs the injection procedure, the movable sleeve 4 cannot move away from the needle seat 22 because it is locked by the stopper 6 at the first position. Direction displacement, thereby, only need to puncture the patient's body surface with the needle body 23 that is partly exposed outside the movable sleeve 4, just can use the above-mentioned injection external force during the process that the needle body 23 penetrates into the patient's body gradually, The movable sleeve 4 is forced by the reaction force resisted by the patient's body surface to press the elastic element 5 and move toward the needle hub 22, and gradually go deep into the annular groove 30, while the curved surface formed by the convex part 43 Sliding smoothly along the slope 61 of the stopper 6, and pressing the stopper 6 to displace radially along the through opening 314 to break away from the annular groove 30, and to rest on the plane end edge 318 of the rib 315, and The puncture injection depth of the needle body 23 is balanced with the strength of the aforementioned external injection force, or positioned at the maximum preset length of the needle body 23 .

Referring to Fig. 9 and Fig. 10, when the aforementioned injection procedures are completed and the needle body 23 is gradually pulled away from the patient's body surface, the movable sleeve 4 will be pushed up by the elastic force of the compressed elastic element 5, Automatically follow the circular groove 30 to move away from the needle seat 22 until the locking surface 41 of the movable sleeve 4 is blocked by the step surface 313 of the inner sleeve 31, and the other locking surface 42 can just be in contact with the inner sleeve 31. The stepped surfaces 323 face each other. In this way, the movable sleeve 4 cannot move along the axis X direction because the opposite locking surfaces 41 , 42 are blocked by the opposite step surfaces 313 , 323 of the inner sleeve 31 and the outer sleeve 32 respectively. And completely cover the needle body 23 to achieve the purpose of isolating the needle body 23 after the injection needle 2 is used. It is worth mentioning that the displacement of the movable sleeve 4 is used to reduce the resistance of the displacement by the elastoplasticity provided by the grooves 311, 321 of the inner sleeve 31 and the outer sleeve 32, so that the displacement of the movable sleeve 4 The action can be completed smoothly.

Referring to Fig. 11 and Fig. 12, it is a second preferred embodiment of the present invention, which is roughly the same as the first preferred embodiment, except that:

The needle body 23 is completely hidden in the movable sleeve 4 before injection. In this way, the patient's fear of the needle body 23 can be reduced, and the movable sleeve 4 can also gradually penetrate into the annular groove 30 along the axis X direction during the injection process, thereby gradually revealing the needle body 23, and during injection After the procedure is completed, as shown in Figure 12, the elastic element 5 is used to push the movable sleeve 4 to a state where it completely covers the needle body 23 and cannot move along the axis X direction, so as to isolate the needle body after use 23 purposes.

Referring to FIG. 13 , FIG. 14 , and FIG. 15 , a third preferred embodiment of the protective device of the present invention is installed on an injection needle 9 . The injection needle 9 has a tube 90, a push rod group 91 that is airtightly slid with a large diameter section 901 of the tube 90 and is used to push the liquid medicine, and a needle connected with a small diameter section 902 of the tube 90. body93. The protective device includes a needle base 92, a sleeve set 3, a movable sleeve 4, an elastic element 5, a stopper 6, an end cap 7, and a Cover 8, the difference is:

The needle base 92 is detachably socketed with the large-diameter section 901 of the tube 90 for the needle body 93 to pass through. In this way, the protective device of the present invention is sheathed on the pipe member 90 and surrounds the needle body 93 at the front end of the pipe member 90 .

When in use, the movable sleeve 4 can also gradually penetrate into the ring groove 30 along the axis X direction during the injection process, as shown in Figure 14, to gradually reveal the needle body 93, and after the injection procedure is completed, As shown in 15 , it is in a state of completely covering the needle body 93 and unable to move along the axis X direction, so as to achieve the purpose of isolating the needle body 93 .

Referring to Fig. 16 and Fig. 17, it is a fourth preferred embodiment of the present invention, which is roughly the same as the third preferred embodiment, except that:

The injection needle 9 also has a medicine tube 94 which is accommodated in the pipe member 90 and pre-stored medicine, and the push rod 91 and the medicine tube 94 are airtightly slid. The drug tube 94 has a tube wall 941 surrounding the axis X, and a plug 942 . The plug 942 closes an end of the tube wall 941 facing the needle hub 92 . The needle hub 92 is sleeved on the small-diameter section 902 of the pipe member 90 , and matches the diameter of the small-diameter section 902 , which is slightly different from the shape of the needle hub 92 in the third preferred embodiment.

Referring to Fig. 18 and Fig. 19, it is a fifth preferred embodiment of the present invention, which is roughly the same as the fourth preferred embodiment, except that:

The pipe member 90 also has an external thread portion 903 formed on an outer surface of the small diameter section 902 . The needle holder 92 also has an internal thread portion 921 formed on an inner surface and screwed with the external thread portion 903 of the tube 90 . The needle body 93 is connected to the needle base 92 and has two piercing sections 931 , 932 facing oppositely and facing the movable sleeve 4 and the medicine tube 94 respectively.

Thereby, when the needle hub 92 is screwed into the external threaded portion 903 of the tube 90 , the piercing section 932 of the needle body 93 will pierce the plug 942 and communicate with the medicine tube 94 .

To sum up, the protective device for injection needles of the present invention has the following advantages and effects:

1. The present invention only uses three pipe fittings such as the inner sleeve 31, the outer sleeve 32, and the movable sleeve 4. Not only are the components significantly less than those of the prior art, the cost is low, and the gap between the inner sleeve 31 and the outer sleeve 32 is The annular groove 30 only needs to accommodate the elastic element 5 and allow the movable sleeve 4 to slide. In addition to reducing the overall volume of the protective device, the inner sleeve 31 and the outer sleeve 32 can also stabilize the movable sleeve 4 .

2. What is important is that the present invention only needs to utilize the special positional relationship between the above-mentioned step surfaces 313, 323, locking surfaces 41, 42, and the stopper 6, so that the movable sleeve 4 can be matched with the use requirements, respectively. Form the first embodiment mode that can provide the injection guide needle body 23, and can also form the second embodiment mode that can provide the needle body 23 completely hidden before use for patients with needle body 23 phobia, and can also be aimed at direct connection The tube 90 with the needle body 93 provides the third and fourth embodiment modes that are directly socketed on the tube 90, or for the injection needle 9 that is pre-prepared with the drug tube 94, when it is socketed on the tube 90, the The fifth embodiment mode in which the needle body 93 pierces and communicates with the drug tube 94 makes it automatically hide the needle body 23 (93) and cannot be displaced after the injection is completed, which is not only easy to use and operate, but also can improve the medical clinical injection operation smoothness, safety and practicality.

The above is only an explanation of the specific structural embodiments of the present invention. Without violating the structure and spirit of the present invention, all those skilled in the art can still make various changes and modifications. In order to be covered in the scope of the following patent applications in this case.

Claims (12)

1. A protective device for an injection needle, which has a pipe, and a needle body connected to the pipe along an axial direction, characterized in that the protective device includes: a needle hub connected to the tube and through which the needle body passes; A sleeve set, connected with the needle hub, has an inner sleeve and an outer sleeve surrounding the axis, the inner sleeve has a first ring formed on an outer surface, and a first ring formed on the first ring a step surface of a surface, the outer sleeve has a second annulus defining an annular groove with the first annulus, and another step oppositely formed on the second annulus; A movable sleeve is inserted in the annular groove, and has a locking surface formed on an inner surface and another locking surface formed on an outer surface; an elastic element is inserted in the annular groove and acts on the movable sleeve; and A stopper is inserted between the annular grooves of the first ring surface and the second ring surface along the direction perpendicular to the axis, so that the movable sleeve is fastened to the stopper so that when pressed by an external force, Follow the circular groove to move toward the needle seat, and push the stopper out of the circular groove, so that the movable sleeve is displaced in the direction opposite to the needle seat by the elastic force of the elastic element, until the The locking surfaces respectively abut against the step surfaces and completely cover the needle body, and are blocked by the step surfaces and cannot move along the axis direction. 2. The protection device for injection needles according to claim 1, characterized in that, the movable sleeve also has two first recesses formed on the inner surface by utilizing the difference in the level difference of the torus, and the first recesses are respectively An accommodating space is provided for the stopper and the stepped surface of the inner casing. 3. The protective device for injection needles according to claim 2, characterized in that, the movable sleeve also has a second concave portion formed on the outer surface by utilizing the change of the level difference of the torus, and the second concave portion provides the casing There is an accommodating space on the pipe step surface. 4 . The protective device for injection needles according to claim 3 , wherein the change in the level difference of the annulus is formed by utilizing the high and low level differences of the curved surface to form the first concave portion and the second concave portion. 5 . 5. The protective device for injection needles according to claim 2, characterized in that, the inner sleeve has a through hole penetrating along the direction perpendicular to the axis, and is formed on an inner surface along the axis direction and has a plane The end edge is exposed in a rib of a part of the opening, the stopper is inserted in the opening along the direction perpendicular to the axis and mounted on the planar end edge of the rib, under the elastic force of the elastic element and in the movable sleeve The locking surfaces on the surface block each other, and stably lock the movable sleeve. 6. The protection device for injection needles according to claim 5, characterized in that, the movable sleeve also has a convex portion formed oppositely between the first concave portions, and the stopper has a protrusion formed at one end An inclined surface, and a limiting surface adjacent to the inclined surface, the inclined surface extends from one end away from the needle base and close to the axis to the other end adjacent to the needle base and away from the axis, so that the stopper goes deep with the movable sleeve The process of the annular groove is squeezed by the convex part of the movable sleeve, and moves into the opening of the inner sleeve, and breaks away from the annular groove until it is blocked by the rib, the limit surface and the inner surface of the movable sleeve. The locking surfaces face each other. 7. The protective device for injection needles according to claim 1, characterized in that, the protective device further comprises a cover, the cover is sleeved with the outer sleeve, and closes the movable sleeve and the needle body . 8. The protection device for injection needles according to claim 1, characterized in that at least one of the inner sleeve and the outer sleeve further has a plurality of shafts extending along the axis direction from the end far away from the needle hub. Split ditch. 9 . The protective device for injection needles according to claim 1 , wherein the needle body is directly connected to the needle holder, and the needle holder is sleeved on the tube. 10 . 10 . The protective device for injection needles according to claim 1 , wherein the needle body is directly connected to the tube, and the needle seat is sleeved on the tube. 11 . 11. The protective device for injection needles according to claim 9 or 10, characterized in that the needle hub has several mating parts formed on an outer surface, and the sleeve set also has a plurality of mating parts formed on the inner sleeve Several engaging parts of at least one of an inner surface of the tube and the second annular surface of the outer sleeve, the engaging parts and the mating parts of the needle hub are engaged with each other, so that the sleeve set cannot be opposed to the needle The seat is rotated, the said matching part can be a concave groove, a convex rib, and a combination of the concave groove and the convex rib, and the said engaging part can be a convex rib, a concave groove, and the said engaging part. A combination of concave grooves and convex ribs. 12. The protective device for injection needles according to claim 11, characterized in that, the needle holder further has a protruding ring formed at the front end, a stop ring adjacent to a rear end, and adjacent to the middle part and A ring formed between the protruding ring and the stop ring, and the inner sleeve also has a concave ring formed on the inner surface opposite to the protruding ring and engaged with the protruding ring, and the outer sleeve also has a A barb at the end abutting against the stop ring and hooked with the ring.