CN114504704A

CN114504704A - Syringe

Info

Publication number: CN114504704A
Application number: CN202210093638.9A
Authority: CN
Inventors: 侯士双; 陈常娇; 袁霞林
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-05-17

Abstract

The invention relates to an injector, which comprises a tube body; the fixing sleeve is vertically arranged in the pipe body and is fixed relative to the pipe body; the injection assembly comprises a needle tube, a piston rod and a needle head, wherein the needle tube is fixedly arranged in the fixed sleeve in a penetrating manner, the piston is arranged in the needle tube and can move up and down relative to the needle tube, the lower end of the piston rod is inserted into the needle tube and can be abutted against the upper end face of the piston, the piston rod can move up and down along the needle tube, and the needle head is connected with the lower end of the needle tube and extends out of the tube body; the movable sleeve is arranged between the fixed sleeve and the tube body, the lower end of the movable sleeve can extend out of the tube body and hide the needle head in the tube body, and the movable sleeve moves upwards relative to the fixed sleeve when being pressed; the elastic piece acts on the movable sleeve to enable the movable sleeve to always keep a downward moving trend; the handle sleeve is sleeved at the upper end of the tube body and can move up and down relative to the tube body, and the handle sleeve is connected with the upper end of the piston rod. The injector is convenient to use and can control the injection speed and the injection amount.

Description

Syringe

Technical Field

The invention relates to the technical field of medical appliances, in particular to an injector.

Background

The injector is widely used in the fields of beauty treatment, medical treatment and the like, the injector has manual injection and automatic injection modes in operation, the manual injector comprises a needle cylinder, a push rod, a piston and a needle head, as shown in the 'injector easy to control injection' disclosed in the Chinese utility model with the patent number of CN201720986544.9 (with the publication number of CN208598918U), when in injection, 4 fingers of a user cooperate with a palm to grasp the needle cylinder, and the injection is completed by pressing the push rod with the thumb, so that the following problems exist: 1. the maximum stroke of the thumb of an adult is 20mm, and the holding type determines that the syringe can not be made thick, so that the medicine loading of the syringe is limited; 2. the injector is inconvenient to use, a user firstly holds the syringe in the specified posture and then presses the push rod with the thumb to complete the injection process, and if the old or other patients with inflexible hands and feet want to complete self-injection, a certain use threshold exists.

In an automatic injector, such as "an automatic injector" disclosed in the chinese utility model patent with patent No. CN202020808343.1 (publication No. CN212395534U), the movable sleeve is pressed against the skin and automatically injected soon after being pressed, but the injection speed is uncontrollable, the injection amount cannot be controlled, even if the injection pen is capable of controlling the injection amount, the dose is set first, the use is inconvenient, and the injection cannot be stopped midway.

Disclosure of Invention

The invention aims to solve the technical problem of providing an injector which is convenient to use and can control the injection progress and the injection amount aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a syringe comprises

The pipe body is vertically arranged and two ends of the pipe body are open;

the fixing sleeve is vertically arranged in the pipe body and is fixed relative to the pipe body;

the injection assembly comprises a needle tube, a piston rod and a needle head, wherein the needle tube is fixedly arranged in the fixed sleeve in a penetrating mode, the piston is arranged in the needle tube and can move up and down relative to the needle tube, the lower end of the piston rod is inserted into the needle tube and can abut against the upper end face of the piston, the piston rod can move up and down along the needle tube, and the needle head is connected with the lower end of the needle tube and extends out of the tube body;

the movable sleeve is arranged between the fixed sleeve and the tube body, the lower end of the movable sleeve can extend out of the tube body and hide the needle head in the tube body, and the movable sleeve moves upwards relative to the fixed sleeve when being pressed;

the elastic piece acts on the movable sleeve to enable the movable sleeve to always keep a downward moving trend;

the handle sleeve is characterized by further comprising a handle sleeve which is sleeved at the upper end of the tube body and can move up and down relative to the tube body, and the handle sleeve is connected with the upper end of the piston rod.

In order to prevent the handle sleeve from moving downwards to inject before the needle penetrates into skin, a positioning piece is arranged on the tube body, the positioning piece extends along the axial lead direction of the tube body, and the positioning piece can swing along the radial direction of the tube body to a first position which is abutted against the handle sleeve to limit the handle sleeve to move downwards or a second position which can be far away from the handle sleeve to allow the handle sleeve to move; the movable sleeve is provided with a locking structure capable of positioning the positioning piece at the first position and an unlocking structure capable of allowing the positioning piece to move to the second position, and the locking structure is located above the unlocking structure. Before the movable sleeve moves to the position where the needle penetrates into the skin, the positioning piece is positioned at the first position by the locking structure, and the handle sleeve cannot move downwards; after the needle penetrates into the skin, the unlocking structure enables the positioning piece to move to the second position, and the handle sleeve can move downwards to perform injection.

The setting element can have multiple structural style, for the convenience with handle cover, movable sleeve cooperation, simple structure ground, the setting element includes extension arm and location portion, the extension arm extends along the axial lead direction of body, and the one end of extension arm links to each other with the body, and the other end links to each other with location portion, the extension arm can be for the radial swing of body, under the state that the setting element is in the first position, the front and the handle cover of location portion offset, the back of location portion offsets with the periphery wall of movable sleeve, the periphery wall of movable sleeve is promptly locking structure. The outer peripheral wall of the movable sleeve extrudes the positioning part to be abutted against the handle sleeve, and the handle sleeve cannot move downwards to perform injection; in addition, the outer peripheral wall of the movable sleeve is used as a locking structure, the structure is simple, and no additional locking structure is needed.

In order to facilitate the location of the fixed sleeve in the pipe body, the periphery wall epirelief of fixed sleeve is equipped with the convex part, link to each other through connecting portion an organic whole between pipe body and the fixed sleeve, set up on the movable sleeve from its top downwardly extending in order to dodge the groove of dodging of connecting portion, be in under the state of first position at the setting element, the periphery wall of movable sleeve offsets with the back of location portion, the internal perisporium of movable sleeve offsets with the convex part. Because the dodging groove is formed in the movable sleeve, the peripheral wall of the movable sleeve has certain elasticity and can swing radially, so that the effect that the peripheral wall of the movable sleeve presses against the positioning part is weakened, and the convex part is arranged on the fixed sleeve and can play a role in stabilizing the peripheral wall of the movable sleeve.

The handle sleeve is tightly propped against the inner peripheral wall of the handle sleeve by the positioning portion, so that the handle sleeve can be limited to move downwards, in order to improve the downward stability of the handle sleeve limited by the positioning portion, the handle sleeve is provided with a first positioning groove, and the positioning portion can be buckled in the first positioning groove, so that the front surface of the positioning portion is propped against the top wall of the first positioning groove. The positioning part is buckled in the first positioning groove, so that the handle sleeve is better in resisting effect.

The unlocking structure can have various structural forms, the structure is simple, the movable sleeve is provided with an avoiding opening for accommodating the positioning part, the avoiding opening is positioned below the locking structure, and the avoiding opening is the unlocking structure. When the positioning part swings into the avoiding opening, the handle sleeve is stopped by the positioning part and disappears, and the handle sleeve can move downwards for injection.

In order to enable the positioning part to swing into the avoiding opening, the front surface of the positioning part is provided with a first inclined surface, the wall thickness of the first inclined surface is gradually thickened along the downward moving direction of the handle sleeve. When dodging the mouth and being about to aim at location portion in the body footpath like this, the handle cover is pressed down, because the effect on first inclined plane, the extension arm can swing towards the direction of movable sleeve for location portion gets into and dodges in the mouth, and location portion disappears to the location of handle cover this moment, and the handle cover can continue to move down and inject.

In order to make after the injection is accomplished, the handle cover can not reciprocate, still set up the second constant head tank that is located directly over the first constant head tank on the handle cover, under the state that the piston moved to the needle tubing bottom, the second constant head tank is radially facing to in the body and is dodging the mouth, location portion lock is established in the second constant head tank. In the injection process, the location portion of setting element is because the inner wall extrusion of handle cover, extension arm are in the state of inside swing all the time, when the second constant head tank radially faces the dodge mouth on the movable sleeve at the body, the handle cover disappears to the extrusion of location portion, and the extension arm swings to the state of natural vertical extension, and location portion is detained and is established in the second constant head tank this moment, plays the effect of location to the handle cover, and the handle cover can not reciprocate.

In order to prevent the user from being injured by the fact that the needle head is exposed when the movable sleeve moves upwards after injection is completed, the limiting piece is arranged on the tube body, and the limiting piece is located on a path where the movable sleeve moves upwards when the piston is located at the bottom of the needle tube and the movable sleeve is located at the lower limit position. After the injection is finished, the limiting piece limits the movable sleeve to move upwards.

Simple structure ground, the locating part includes linking arm and spacing portion, the linking arm extends along the axial lead direction of body, and the upper end and the body of linking arm link to each other, and the lower extreme links to each other with spacing portion, the linking arm can be for the radial swing of body, and is located needle tubing bottom and movable sleeve under the state that is located lower extreme position at the piston, spacing portion is located directly over the movable sleeve.

Before injection is completed, the movable sleeve can extrude the limiting part to the connecting arm to swing outwards, after injection is completed and the movable sleeve moves downwards, the connecting arm can resume swinging until the limiting part is positioned right above the movable sleeve, but the requirement that the limiting part does not interfere with the downward movement of the handle sleeve is met, so that the handle sleeve is provided with a vertically extending strip-shaped groove, the limiting part can be positioned in the strip-shaped groove, and relative displacement can be generated between the limiting part and the strip-shaped groove; the top of the movable sleeve is provided with an elastic arm capable of swinging relative to the movable sleeve in the radial direction;

the limiting part is positioned in the strip-shaped groove under the condition that the piston is positioned in the middle of the needle tube; under the state that the movable sleeve is positioned at the upper limit position and the piston is positioned at the bottom of the needle tube, the front surface of the limit part is abutted against the inner peripheral wall at the upper end of the strip-shaped groove, and the back surface of the limit part is abutted against the elastic arm of the movable sleeve; under the state that the piston is located needle tubing bottom and the movable sleeve is located the lower extreme position, the front of spacing portion offsets with the internal perisporium of bar groove upper end, just spacing portion is located the movable sleeve directly over. Before injection is finished, the limiting part is positioned in the strip-shaped groove, and interference on upward movement of the movable sleeve can be avoided; when the piston moves to the bottom of the needle tube and injection is finished, the limiting part is positioned above the strip-shaped groove, the limiting part is extruded by the inner peripheral wall of the handle sleeve at the moment, the connecting arm swings inwards, and the limiting part extrudes the elastic arm of the movable sleeve to swing inwards; when the injector is removed from the skin, the movable sleeve moves downwards under the action of the elastic piece, but the limiting part is still in a state that the limiting part is extruded by the inner peripheral wall of the handle sleeve and the connecting arm swings inwards, and the limiting part is positioned right above the movable sleeve to limit the movable sleeve to move upwards.

Before the injection begins, there is certain distance between the lower extreme of piston and piston rod, when pushing down after the handle cover unblock, leads to the piston rod to play axially suddenly easily, and the use feels poor and injection speed is too fast, the lower extreme of piston rod is equipped with the damping piece, the internal perisporium in close contact with of periphery wall and the needle tubing of this damping piece, and the damping piece can reciprocate along the needle tubing along the piston rod. The damping block has the function of increasing damping for the downward movement of the piston rod and relieving the over-high speed of the piston rod during the initial movement.

The movable sleeve is an actuating piece, and when injection is needed, the handle sleeve is unlocked by pressing the movable sleeve, so that the injection assembly can inject liquid medicine. However, if the syringe is dropped onto a hard surface (for example if the user drops the device onto the floor), the holster is likely to move on impact and trigger the injection assembly, causing waste of medication.

If the syringe is disposable and the user has not used it is discarded and a new syringe must be purchased, resulting in money and syringe waste; if the syringe is reusable, it must also be reloaded to deliver a new dose, resulting in wasted fluid. Preferably, the lower extreme of body can be covered with the cap body with dismantling, be equipped with axial extension's first support arm on the cap body, the inside of movable sleeve is equipped with axial extension and rather than the second support arm that links to each other, and the top of second support arm can the cartridge in fixed cover, fixed cover is last to be equipped with the fender portion that can offset with the top of second support arm the cap body is covered under the state of establishing on the body, the second support arm is extruded between first support arm and fixed cover, and the second support arm offsets with fender portion. The first support arm is arranged on the cap body, the second support arm is arranged on the movable sleeve, and the first support arm extrudes the second support arm to enable the second support arm to be abutted against the blocking part of the fixed sleeve under the condition that the cap body is covered on the tube body, so that the movable sleeve is limited to move upwards, the movable sleeve is prevented from moving upwards under the unnecessary condition (when the injection assembly is not used) and further triggering the injection assembly to cause waste of liquid medicine or scrapping of the injection device; the first support arm can release the extrusion to the second support arm under the state that the cap body is dismantled from the body, makes the second support arm break away and is bound by the fender portion, and the movable sleeve can upwards move and make the syringe normally work.

After not extrudeing the second support arm in order to make first support arm, the movable sleeve can rebound smoothly, the top of second support arm is equipped with the second inclined plane that top-down leaned out, be equipped with the third inclined plane that top-down leaned out on the internal perisporium of fixed cover, the third inclined plane can offset with the second inclined plane, and this third inclined plane is promptly for keeping off the portion, and the removal is sheathe in at the activity because the effect on third inclined plane, the angle that the second support arm can inwards swing and remove to avoid the interference of keeping off the portion.

Compared with the prior art, the invention has the advantages that: according to the invention, the handle sleeve is arranged, so that after the movable sleeve is pressed against the skin, the handle sleeve is pressed downwards, the injection of the liquid medicine can be realized, during the injection, the injector does not need to be held, only the movable sleeve is required to be pressed downwards to push against the skin, the requirement on the posture of the hand for operating the injector during the injection is low, and the use is convenient; the syringe is not held by the palm and the piston rod is pushed by the thumb for injection, so that the length and the diameter of the needle tube can be larger, and the medicine loading is larger; in addition, the injection is performed by pressing the handle sleeve, so that the injection speed and the injection amount can be controlled, the injection can be stopped at any time in the middle of the injection process, and the liquid medicine can not seep out.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the present invention (with a cap mounted on the tube);

FIG. 2 is a cross-sectional view (half-section from the positioning member) of FIG. 1;

FIG. 3 is another cross-sectional view (half-section from the stop) of FIG. 1;

FIG. 4 is another cross-sectional view of FIG. 1 (half-section from the second arm of the holster);

FIG. 5 is a schematic view of the structure of FIG. 1 with the cap and outer cover removed;

FIG. 6 is a schematic structural view of the tube in FIG. 5;

FIG. 7 is a structural view of the tube body of FIG. 5 in another direction;

FIG. 8 is a schematic structural view of the inner tube of FIG. 2;

FIG. 9 is a schematic view of the structure of the active sheath of FIG. 5;

FIG. 10 is a cross-sectional view of FIG. 9;

FIG. 11 is an exploded view of FIG. 1 (with the cap removed from the tube);

FIG. 12 is a cross-sectional view (half-section from the retainer) of FIG. 11;

FIG. 13 is a schematic view of the movable sleeve of FIG. 1 moving upward (the avoiding opening faces the positioning portion of the positioning member);

FIG. 14 is a cross-sectional view (half-section at the location of the locating feature) of FIG. 13;

FIG. 15 is a cross-sectional view of the handle cover of FIG. 13 pressed down (half-section from the detent);

FIG. 16 is a schematic view of the handle cover of FIG. 15 shown in a lower limit position;

FIG. 17 is a cross-sectional view (half-section from the positioner) of FIG. 16;

FIG. 18 is another cross-sectional view (half-section from the stop) of FIG. 16;

FIG. 19 is a schematic structural view of the reduction of the movable sleeve of FIG. 16;

FIG. 20 is a cross-sectional view (half-section from the retainer) of FIG. 19;

fig. 21 is another cross-sectional view (half cut from the stop) of fig. 19.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 21, the syringe of the preferred embodiment includes a tube body 1, a fixed sleeve 2, an injection assembly, a movable sleeve 4, a handle sleeve 5, an elastic member 6 and a cap body 8.

The vertical setting of body 1 and both ends are uncovered, and fixed cover 2 is vertical to be located in the body 1 and fixed for body 1. In this embodiment, the pipe body 1 and the fixing sleeve 2 are integrally formed through the connecting portion 10, and the movable sleeve 4 is provided with an avoiding groove 45 which extends downwards from the top thereof to avoid the connecting portion 10, and of course, the pipe body 1 and the fixing sleeve 2 can also be assembled.

As shown in fig. 2, the injection assembly includes a needle tube 71, a piston 72, a piston rod 73 and a needle 74, the needle tube 71 is fixedly inserted into the fixed sleeve 2, the piston 72 is disposed in the needle tube 71 and can move up and down relative to the needle tube 71, the lower end of the piston rod 73 is inserted into the needle tube 71 and can abut against the upper end surface of the piston 72, the piston rod 73 can move up and down along the needle tube 71, and the needle 74 is connected with the lower end of the needle tube 71 and extends out of the tube body 1.

Since the piston 72 and the lower end of the piston rod 73 have a certain distance before the start of injection and the piston rod 73 is likely to suddenly move in the axial direction immediately after the piston rod 73 starts moving downward, the feeling of use is poor and the injection speed is too high, the lower end of the piston rod 73 is provided with a damping block 75, the outer peripheral wall of the damping block 75 is in close contact with the inner peripheral wall of the needle tube 71, and the damping block 75 can move up and down along the needle tube 71 along with the piston rod 73. The damping block 75 may be a rubber block and functions to increase the damping for the downward movement of the piston rod 73 and to alleviate the piston rod 73 from moving too fast during the initial movement.

As shown in fig. 12, the movable sleeve 4 is sleeved on the fixed sleeve 2, the movable sleeve 4 is located between the fixed sleeve 2 and the tube body 1, the lower end of the movable sleeve 4 can extend out of the tube body 1 and hide the needle 74, the movable sleeve 4 moves upward relative to the fixed sleeve 2 when being pressed by skin, and the elastic element 6 acts on the movable sleeve 4 to keep the movable sleeve 4 moving downward all the time. In this embodiment, the elastic element 6 is a spring, the upper end of which abuts against the connecting portion 10 of the fixed sleeve and the lower end of which abuts against the connecting wall 40 connecting the movable sleeve 4 and the second arm 44 below.

A vertically extending limiting groove 41 is formed in the peripheral wall of the movable sleeve 4, a positioning block 21 is arranged on the peripheral wall of the fixed sleeve 2, the positioning block 21 is located in the limiting groove 41, and when the movable sleeve 4 moves downwards to the top wall of the limiting groove 41 and abuts against the positioning block 21, the movable sleeve 4 moves to the lower limit position, as shown in fig. 12; when the movable sleeve 4 is moved up until the connecting portion 10 abuts against the bottom wall of the avoiding groove 15, the movable sleeve 4 is moved to the upper limit position, as shown in fig. 17.

The handle sleeve 5 is sleeved at the upper end of the tube body 1 and can move up and down relative to the tube body 1, the handle sleeve 5 is connected with the upper end of the piston rod 73, and when the handle sleeve 5 is pressed downwards, the piston rod 73 moves downwards to push the piston 72 to inject liquid medicine.

As shown in fig. 6 and 8, the outer peripheral wall of the tube body 1 is provided with a guide block 11, the inner peripheral wall of the handle sleeve 5 is provided with a guide groove 51, the guide block 11 can be placed in the guide groove 51 and slide along the guide groove 51, the guide groove 51 extends vertically, and the guide block 11 and the guide groove 51 are matched to enable the handle sleeve 5 to move only up and down. It is of course also possible to arrange the guide groove on the tube body 1 and the guide block on the handle sleeve 5. This structure also achieves the above object.

When in injection, the handle sleeve 5 is held to push the movable sleeve 4 against the skin and is pressed downwards, so that the needle 74 penetrates into the skin, then the handle sleeve 5 is pressed downwards to inject the liquid medicine, but in order to prevent the needle 74 from penetrating into the skin in place, the handle sleeve 5 moves downwards to inject, the pipe body 1 is provided with the positioning piece 12, the positioning piece 12 extends along the axial lead direction of the pipe body 1, and the positioning piece 12 can swing along the radial direction of the pipe body 1 to a first position which is abutted against the handle sleeve 5 to limit the downward movement of the handle sleeve 5 or a second position which is far away from the handle sleeve 5 to allow the movement of the handle sleeve 5; the movable sleeve 4 is provided with a locking structure capable of positioning the positioning member 12 at a first position and an unlocking structure allowing the positioning member 12 to move to a second position, and the locking structure is positioned above the unlocking structure.

As shown in fig. 2, 4 and 6, in this embodiment, the positioning element 12 includes an extension arm 121 and a positioning portion 122, the extension arm 121 extends along an axial line direction of the tube body 1, a first through hole 13 is formed on a circumferential wall of the tube body 1, an upper end of the extension arm 121 is connected to a top wall of the first through hole 13, a lower end of the extension arm is connected to the positioning portion 122, the positioning portion 122 is located in the first through hole 13, and the extension arm 121 can swing radially relative to the tube body 1. The outer peripheral wall of the fixed sleeve 2 is convexly provided with a convex part 20, when the positioning element 12 is in the first position, the front surface (i.e. the outer surface) of the positioning part 122 abuts against the handle sleeve 5, the back surface (i.e. the inner surface) of the positioning part 122 abuts against the outer peripheral wall of the movable sleeve 4, the inner peripheral wall of the movable sleeve 4 abuts against the convex part 20, and the outer peripheral wall of the movable sleeve 4 is the locking structure. In this embodiment, the handle sleeve 5 is provided with a first positioning groove 52, the positioning portion 122 can be buckled in the first positioning groove 52, so that the front surface of the positioning portion 122 is abutted against the top wall of the first positioning groove 52, and the front surface of the positioning portion 122 has a first inclined surface 1221 whose wall thickness gradually becomes thicker along the downward movement direction of the handle sleeve 5.

As shown in fig. 2, before the movable sleeve 4 moves to the position where the needle 74 pierces the skin, the outer peripheral wall of the movable sleeve 4 presses the positioning portion 122 outward to abut against the handle sleeve 5 (i.e. the locking structure positions the positioning member 12 at the first position), and the handle sleeve 5 cannot move downward for injection;

as shown in fig. 15, the movable sleeve 4 is provided with an escape opening 42 for accommodating the positioning portion 122 therein, the escape opening 42 is located below the locking structure, and the escape opening 42 is the unlocking structure. After the needle 74 penetrates the skin, the movable sleeve 4 moves upwards to the avoiding opening 42, that is, it faces the positioning portion 122, and the handle sleeve 5 is pressed downwards, because of the first inclined surface 1221, the extension arm 121 swings towards the direction of the movable sleeve 4, so that the positioning portion 122 enters the avoiding opening 42 (at this time, the positioning member 12 moves to the second position due to the unlocking structure), at this time, the positioning of the positioning portion 122 on the handle sleeve 5 disappears, and the handle sleeve 5 can move downwards for injection.

As shown in fig. 17, the handle cover 5 further has a second positioning groove 53 located right above the first positioning groove 52, the second positioning groove 53 faces the avoiding opening 42 in the radial direction of the tube 1 in the state that the piston 72 moves to the bottom of the needle tube 71, and the positioning portion 122 is buckled in the second positioning groove 53 by the restoring force of the extension arm 121. Specifically, in the injection process, the positioning portion 122 of the positioning member 12 is pressed by the inner wall of the handle sleeve 5, and the extension arm 121 is always in the state of swinging inward, when the second positioning groove 53 radially faces the avoiding opening 42 on the movable sleeve 4 in the tube body 1, the handle sleeve 5 presses the positioning portion 122 away, the extension arm 121 swings to the state of extending naturally and vertically, the positioning portion 122 is buckled in the second positioning groove 53, and the movable sleeve 4 moves downward under the action of the elastic member 6 after being separated from the skin, and the avoiding opening 42 on the movable sleeve 4 is located below the positioning portion 122, that is, the outer peripheral wall of the movable sleeve 4 abuts against the back surface of the positioning portion 122 (as shown in fig. 20), so that the handle sleeve 5 cannot move upward; and because the piston 72 is pressed against the bottom of the needle tube 71 after the injection is finished, the handle sleeve 5 is fixedly connected with the piston rod 73, and the needle tube 71 plays a role in limiting the handle sleeve 5 to move downwards.

As shown in fig. 3, 6, 8, and 9, the pipe body 1 is provided with a limiting member 14, the limiting member 14 includes a connecting arm 141 and a limiting portion 142, the second through hole 15 is formed in the peripheral wall of the pipe body 1, the connecting arm 141 extends along the axial line direction of the pipe body 1, the upper end of the connecting arm 141 is connected to the top wall of the second through hole 15, the lower end of the connecting arm is connected to the limiting portion 142, the limiting portion 142 is located in the second through hole 15, and the connecting arm 141 can swing radially relative to the pipe body 1.

The handle sleeve 5 is provided with a vertically extending strip-shaped groove 54, the limiting part 142 can be positioned in the strip-shaped groove 54, and relative displacement can be generated between the limiting part and the strip-shaped groove 54; the top of the mobile jacket 4 is provided with an elastic arm 43 able to oscillate radially with respect thereto.

As shown in fig. 3, in a state where the piston 72 is positioned at the middle portion of the needle tube 71, the stopper 142 is positioned at the middle-lower portion of the strip-shaped groove 54; before the injection is completed, the stopper 142 is located in the groove 54, and does not interfere with the upward movement of the movable sleeve 4.

As shown in fig. 18, in a state where the movable sleeve 4 is located at the upper limit position and the piston 72 is located at the bottom of the needle tube 71, the front surface of the stopper 142 abuts against the inner peripheral wall of the upper end of the strip-shaped groove 54, the back surface of the stopper 142 abuts against the elastic arm 43 of the movable sleeve 4, and the stopper 142 presses the elastic arm 43 of the movable sleeve 4 to swing inward;

as shown in fig. 21, after the injector is removed from the skin, when the piston 72 is located at the bottom of the needle tube 71 and the movable sleeve 4 is located at the lower limit position, the movable sleeve 4 moves downward under the action of the elastic element 6, but the limiting portion 142 is still in a state of being squeezed by the inner peripheral wall of the handle sleeve 5 and swinging the connecting arm 141 inward, that is, the front surface of the limiting portion 142 abuts against the inner peripheral wall of the upper end of the strip-shaped groove 54, and when the limiting portion 142 is located right above the movable sleeve 4, that is, the limiting member 14 is located on the upward moving path of the movable sleeve 4, so as to limit the movable sleeve 4 to move upward, so as to prevent the needle 74 from being exposed and injuring the user.

As shown in fig. 4, the lower end of the pipe body 1 is detachably covered with the cap body 8, the cap body 8 is provided with a first support arm 81 extending axially, the movable sleeve 4 is provided with a second support arm 44 extending axially and connected with the movable sleeve, the top of the second support arm 44 is provided with a second inclined plane 441 inclining outwards from top to bottom, the top of the second support arm 44 can be inserted into the fixed sleeve 2, the fixed sleeve 2 is provided with a blocking part capable of abutting against the top of the second support arm 44, and the blocking part is a third inclined plane 22 inclining outwards from top to bottom and arranged on the inner peripheral wall of the fixed sleeve 2.

Under the state that the cap body 8 covers the tube body 1, the second support arm 44 is extruded between the first support arm 81 and the fixed sleeve 2, and the second support arm 44 abuts against the blocking part, so that the movable sleeve 4 is limited to move upwards, and the movable sleeve 4 is prevented from moving upwards under the unnecessary condition (when the injector does not work), and further the injection assembly is triggered to cause the waste of liquid medicine or the rejection of the injection device.

As shown in fig. 12 and 14, in a state that the cap body 8 is detached from the tube body 1, the first arm 81 can release the pressing on the second arm 44, so that the second arm 44 is released from being bound by the blocking portion, and the movable sleeve 4 can move upward, and during the moving process of the movable sleeve 4, due to the effect of the third inclined surface 22, the second arm 44 can swing inward by a certain angle to avoid the interference of the blocking portion, thereby ensuring that the movable sleeve 4 can move upward smoothly.

As shown in fig. 2 and 8, in this embodiment, the handle cover 5 includes an outer cover 55 and an inner tube 56, the top of the outer cover 55 is closed and is sleeved on the inner tube 56, the first positioning groove 52, the second positioning groove 53, and the strip-shaped groove 54 are formed by matching through holes provided on the inner tube 56 with the inner wall surface of the outer cover 55, so as to form the groove on the inner wall surface of the handle cover 5, and the guide groove 51 is provided on the inner wall surface of the inner tube 56.

The operation of the syringe of this embodiment is as follows:

1. in the initial state, as shown in fig. 2, 3 and 4, the cap 8 is covered on the tube 1, the second arm 44 is squeezed between the first arm 81 and the fixed sleeve 2, and the movable sleeve 4 cannot move upwards; the positioning part 122 of the positioning piece 12 is positioned in the first positioning groove 52 and is extruded by the outer peripheral wall of the movable sleeve 4, the inner peripheral wall of the movable sleeve 4 is abutted against the convex part 20, and the handle sleeve 5 cannot move downwards; the limiting part 142 of the limiting part 14 is positioned at the lower part of the strip-shaped groove 54; the lower end of the movable sleeve 4 extends out of the tube body 1 and hides the needle head 74 inside;

2. taking off the cap body 8, as shown in fig. 12, the first arm 81 releases the pressing of the second arm 44, and the other states are the same as the initial state;

3. as shown in fig. 14, the movable sleeve 4 is pressed against the skin, the movable sleeve 4 moves upwards, the needle 74 gradually penetrates the skin, the second arm 44 swings inwards, at this time, because the positioning portion 122 is positioned in the first positioning groove 52, the handle sleeve 5 cannot move downwards relative to the tube body 1, and the movable sleeve 4 moves until the avoiding opening 42 is opposite to the positioning portion 122 of the positioning member 12 in the radial direction of the tube body 1;

4. as shown in fig. 15, when the handle sleeve 5 is pressed downward, the piston rod 73 moves downward, the extension arm 121 of the limiting member 12 swings inward until the positioning portion 122 escapes from the first positioning groove 52 and moves into the escape opening 42, and the damping block 75 on the piston rod 73 contacts the piston 72; in the process of moving the handle sleeve 5 downwards, the position of the limiting part 142 of the limiting part 14 in the strip-shaped groove 54 also rises;

5. as shown in fig. 17 and 18, the handle sleeve 5 is continuously pressed downward, the piston 72 moves downward to inject the liquid medicine, until the positioning portion 122 of the positioning member 12 radially faces the second positioning groove 53 in the tube body 1 and is fastened in the second positioning groove 53, the handle sleeve 5 cannot move upward, the piston 72 is located at the bottom of the needle tube 71, the injection is completed, and the handle sleeve 5 cannot move downward due to the limiting effect of the needle tube 71 on the piston 72; the limiting part 142 of the limiting part 14 is extruded by the inner wall of the upper end of the strip-shaped groove 54 to swing inwards, the limiting part 142 extrudes the elastic arm 43 of the movable sleeve 4 to swing inwards, otherwise, the limiting part 142 interferes with the movable sleeve 4, and the movable sleeve 4 cannot move upwards;

6. as shown in fig. 20 and 21, when the injector is removed from the skin, the movable sleeve 4 moves downwards to the lower limit position under the action of the elastic element 6, the limiting part 142 is still in a state of being pressed by the inner peripheral wall at the upper end of the strip-shaped groove 54 and the connecting arm 141 swings inwards, and at this time, the limiting part 142 is positioned right above the movable sleeve 4 to limit the movable sleeve 4 to move upwards, so as to prevent the user from being pricked by the exposed needle 74.

In the above, the term "inner" means a direction close to the axis of the pipe body 1, and the term "outer" means a direction away from the axis of the pipe body 1. As can be seen from the above, the syringe of the present embodiment involves few parts, is easy to use, and can control the injection speed and the injection amount.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity.

Claims

1. A syringe comprises

The pipe body (1) is vertically arranged and two ends of the pipe body are open;

the fixing sleeve (2) is vertically arranged in the pipe body (1) and is fixed relative to the pipe body (1);

the injection assembly comprises a needle tube (71), a piston (72), a piston rod (73) and a needle head (74), wherein the needle tube (71) is fixedly arranged in the fixed sleeve (2) in a penetrating manner, the piston (72) is arranged in the needle tube (71) and can move up and down relative to the needle tube (71), the lower end of the piston rod (73) is inserted into the needle tube (71) and can abut against the upper end face of the piston (72), the piston rod (73) can move up and down along the needle tube (71), and the needle head (74) is connected with the lower end of the needle tube (71) and extends out of the tube body (1);

the movable sleeve (4) is arranged between the fixed sleeve (2) and the tube body (1), the lower end of the movable sleeve (4) can extend out of the tube body (1) and hide the needle head (74), and the movable sleeve (4) moves upwards relative to the fixed sleeve (2) when being pressed;

the elastic piece (6) acts on the movable sleeve (4) to enable the movable sleeve (4) to keep a downward moving trend all the time;

the novel telescopic handle is characterized by further comprising a handle sleeve (5) which is sleeved at the upper end of the pipe body (1) and can move up and down relative to the pipe body (1), wherein the handle sleeve (5) is connected with the upper end of the piston rod (73).

2. The syringe of claim 1, wherein: the positioning piece (12) is arranged on the pipe body (1), the positioning piece (12) extends along the axial lead direction of the pipe body (1), and the positioning piece (12) can swing along the radial direction of the pipe body (1) to a first position which is abutted against the handle sleeve (5) to limit the handle sleeve (5) to move downwards or a second position which can be far away from the handle sleeve (5) to allow the handle sleeve (5) to move; the movable sleeve (4) is provided with a locking structure capable of positioning the positioning piece (12) at a first position and an unlocking structure capable of allowing the positioning piece (12) to move to a second position, and the locking structure is located above the unlocking structure.

3. The syringe of claim 2, wherein: the locating piece (12) comprises an extension arm (121) and a locating portion (122), the extension arm (121) extends along the axial lead direction of the pipe body (1), one end of the extension arm (121) is connected with the pipe body (1), the other end of the extension arm is connected with the locating portion (122), the extension arm (121) can swing radially relative to the pipe body (1), the locating piece (12) is located at the first position, the front face of the locating portion (122) is abutted to the handle sleeve (5), the back face of the locating portion (122) is abutted to the peripheral wall of the movable sleeve (4), and the peripheral wall of the movable sleeve (4) is the locking structure.

4. The syringe of claim 3, wherein: the periphery wall epirelief of fixed cover (2) is equipped with convex part (20), link to each other through connecting portion (10) an organic whole between body (1) and fixed cover (2), set up on movable sleeve (4) and dodge groove (45) from its top downwardly extending in order to dodge connecting portion (10), be in under the state of primary importance in setting element (12), the periphery wall of movable sleeve (4) offsets with the back of location portion (122), the internal perisporium and convex part (20) of movable sleeve (4) offset.

5. The syringe of claim 3, wherein: the handle sleeve (5) is provided with a first positioning groove (52), and the positioning part (122) can be buckled in the first positioning groove (52), so that the front surface of the positioning part (122) is abutted against the top wall of the first positioning groove (52).

6. The syringe of claim 5, wherein: the movable sleeve (4) is provided with an avoiding opening (42) for accommodating the positioning part (122), the avoiding opening (42) is positioned below the locking structure, and the avoiding opening (42) is the unlocking structure.

7. The syringe of claim 6, wherein: the front surface of the positioning part (122) is provided with a first inclined surface (1221) with the wall thickness gradually becoming thicker along the downward moving direction of the handle sleeve (5).

8. The syringe of claim 6, wherein: the handle sleeve (5) is further provided with a second positioning groove (53) located right above the first positioning groove (52), the second positioning groove (53) radially faces the avoidance opening (42) in the tube body (1) in the state that the piston (72) moves to the bottom of the needle tube (71), and the positioning part (122) is buckled in the second positioning groove (53).

9. The syringe of any one of claims 1 to 8, wherein: the lower end of the piston rod (73) is provided with a damping block (75), the outer peripheral wall of the damping block (75) is in close contact with the inner peripheral wall of the needle tube (71), and the damping block (75) can move up and down along the needle tube (71) along with the piston rod (73).

10. The syringe of any one of claims 1 to 8, wherein: the pipe body (1) is provided with a limiting piece (14), and the limiting piece (14) is positioned on the upward moving path of the movable sleeve (4) in the state that the piston (72) is positioned at the bottom of the needle pipe (71) and the movable sleeve (4) is positioned at the lower limit position.

11. The syringe of claim 10, wherein: the limiting part (14) comprises a connecting arm (141) and a limiting part (142), the connecting arm (141) extends along the axial lead direction of the tube body (1), one end of the connecting arm (141) is connected with the tube body (1), the other end of the connecting arm is connected with the limiting part (142), the connecting arm (141) can swing radially relative to the tube body (1), the piston (72) is located at the bottom of the needle tube (71) and the movable sleeve (4) is located at the lower limit position, and the limiting part (142) is located right above the movable sleeve (4).

12. The syringe of claim 11, wherein: a vertically extending strip-shaped groove (54) is formed in the handle sleeve (5), the limiting part (142) can be located in the strip-shaped groove (54), and relative displacement can be generated between the limiting part and the strip-shaped groove; the top of the movable sleeve (4) is provided with an elastic arm (43) which can swing relative to the radial direction of the movable sleeve;

the limiting part (142) is positioned in the strip-shaped groove (54) under the condition that the piston (72) is positioned in the middle part of the needle tube (71); under the condition that the movable sleeve (4) is positioned at the upper limit position and the piston (72) is positioned at the bottom of the needle tube (71), the front surface of the limit part (142) is abutted against the inner peripheral wall at the upper end of the strip-shaped groove (54), and the back surface of the limit part (142) is abutted against the elastic arm (43) of the movable sleeve (4); under the condition that the piston (72) is positioned at the bottom of the needle tube (71) and the movable sleeve (4) is positioned at the lower limit position, the front surface of the limiting part (142) is abutted against the inner peripheral wall at the upper end of the strip-shaped groove (54), and the limiting part (142) is positioned right above the movable sleeve (4).

13. The syringe of any one of claims 1 to 8, wherein: the lower extreme of body (1) can be covered with the cap body (8) with dismantling, be equipped with axially extended first support arm (81) on the cap body (8), the inside of movable sleeve (4) is equipped with axially extended and rather than continuous second support arm (44), and the top of second support arm (44) can the cartridge in fixed cover (2), be equipped with the fender portion that can offset with the top of second support arm (44) on fixed cover (2) the state on body (1) is established in cap body (8) lid, second support arm (44) are extruded between first support arm (81) and fixed cover (2), and the top of second support arm (44) offsets with the fender portion.

14. The syringe of claim 13, wherein: the top of the second support arm (44) is provided with a second inclined surface (441) which inclines outwards from top to bottom, the inner peripheral wall of the fixed sleeve (2) is provided with a third inclined surface (22) which inclines outwards from top to bottom, the third inclined surface (22) can be abutted against the second inclined surface (441), and the third inclined surface (22) is the blocking part.