CN113018593B - Medical device for treating diabetes - Google Patents

Abstract

The invention discloses a medical device for treating diabetes, which comprises a shell, wherein an injection inner core capable of moving back and forth and a needle head detachably mounted at the front end of the injection inner core are arranged in an inner cavity of the shell, a medicine bottle for supplying medicine to the injection inner core is also arranged in the inner cavity of the shell, the injection inner core comprises a core barrel, a piston rod, a sliding part and a liquid suction needle, the piston of the core barrel is arranged in the inner cavity of the core barrel in a sliding manner, the piston rod is connected to one side of the piston and extends out of one end of the core barrel, the other end of the core barrel is provided with an injection port connected with the needle head, the extending end of the piston rod is connected to one side of the sliding part, the liquid suction needle is mounted on the other side of the sliding part, and the liquid suction needle is inserted into the medicine bottle to suck medicine liquid. The invention can prevent air from entering the injection port at the front end of the core barrel in the process of replacing the needle head, and can prevent residual liquid from being expanded by heating and seeping out of the injection port when the device is stored in a state that the one-way switch valve is closed.

Description

A medical device for diabetes treatment

technical field

The invention belongs to the field of medical supplies, and relates to a medical device for treating diabetes.

Background technique

In the current treatment of diabetes, regular insulin injections are routinely administered according to the patient's condition. When the condition is severe, the patient often needs intensive insulin therapy, that is, injecting insulin 3-4 times a day. This method requires multiple injections a day, and because the injections are more frequent, there are many methods in the prior art that can facilitate the patient to perform subcutaneous injections. Injection-molded devices, such as insulin pens, are used to allow patients to self-administer regular injections to manage their diabetes. Since the needle needs to be replaced for each injection, there are some injection devices that can easily replace the needle or even replace the needle by itself. However, it is found during use that patients or their relatives often forget to replace the syringe or injection before injection. The gas in the cavity is discharged, which will affect the injection dose and injection effect during injection. The gas in the injection cavity mostly enters during the process of changing the needle and inhaling the liquid medicine. In addition, another problem that often occurs is the injection device that is used multiple times. There is often a small amount of liquid medicine remaining in the injection cavity of the inner core. When traveling and working, the user may not be able to timely after each injection. Clean the inner core, so when the injection device is stored, the residual liquid often seeps out from the needle. This is because the preservation of insulin needs to be maintained at a lower temperature, so the residual liquid in the injection device is prone to thermal expansion after injection. Therefore, The leakage from the needle contaminates the injection device and the surrounding environment, and the concentration of the residual liquid after the leakage will also be affected to a certain extent, causing a certain error in the next injection.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a medical device for diabetes treatment, so as to solve the problem that the injection device that can quickly replace the needle in the prior art cannot prevent the air from entering the injection cavity when the needle is replaced and the medicinal liquid is inhaled, so that the patient must It is a technical problem that the gas is discharged during the first injection, and the residual liquid after the injection cannot be prevented from easily leaking out of the needle during natural storage, polluting the injection device and the surrounding environment.

The described medical device for diabetes treatment comprises a casing, an injection inner core that can move back and forth and a needle detachably installed at the front end of the injection inner core are arranged in the inner cavity of the casing, and the inner cavity of the casing is provided with a The inner cavity is also provided with a medicine bottle for supplying medicine to the injection inner core. The injection inner core includes a core barrel, a piston, a piston rod, a sliding member and a liquid suction needle. The core barrel piston is slidably arranged with the core barrel. In the inner cavity of the barrel, the piston rod is connected to one side of the piston and protrudes from one end of the core barrel, and the other end of the core barrel is provided with an injection port connected to the needle, and the extension of the piston rod The end is connected to one side of the sliding member, the other side of the sliding member is installed with the liquid suction needle, the liquid suction needle is inserted into the medicine bottle to absorb the liquid medicine, and the sliding member is provided with a protruding shell for For the drive rod that drives the movement of the slider, the suction needle and the inner cavity of the core barrel are communicated through a suction channel, and the injection port is provided with a one-way on-off valve that only allows flow in the direction of the needle, The suction channel is provided with a one-way valve that only allows flow in the direction of the core barrel, the one-way switch valve is controlled to open and close by a switch member that moves perpendicular to the movement direction of the injection core, and the switch member is connected to the The core barrels are slidably connected by a sliding structure, the left and right sides of the switch member are symmetrically fixed with protruding sliding columns, and the inner side of the casing is provided with a sliding groove matched with the sliding columns to drive the switching components to rise and fall. The chute includes a low-position groove located in the front and rear parts, a high-position groove located in the middle part, and an inclined transition groove, and the transition groove is used to connect the low-position groove and the high-position groove. The front part is at the position where the needle is replaced and the rear part is at the position where the new needle is replaced, and the middle part of the high position groove is the stop position of the injection port in the storage state.

Preferably, the one-way switch valve is a membrane valve, including a valve body, a membrane and a valve plate, the valve body is provided with a water inlet, a water outlet and a valve cavity, and the membrane is arranged in the valve cavity and covered on On the water inlet, the aperture of the water outlet is smaller than that of the membrane and protrudes toward the membrane, the valve plate is fixedly connected with the switch member and is slidably inserted into the valve cavity from the lower side, so that the The valve plate and the valve body are kept sealed. In the open state, the membrane arches toward the water outlet to open the water inlet. In the closed state, the valve plate is inserted and pressed against the membrane to seal the inlet. water outlet.

Preferably, the chute further includes a straight connecting groove that is connected to the low position grooves at both ends in a straight line; There is a first elastic blocking piece, and the other end is provided with a second elastic blocking piece. The first elastic blocking piece in the natural state seals the end of the straight connecting groove there and is squeezed by the rear side When opened, the second elastic blocking piece seals the end of the corresponding transition groove there in a natural state and opens when it is pressed by the upper side.

Preferably, the front part of the core barrel is detachably mounted on a front sliding assembly that slides in the inner cavity of the housing, the front sliding assembly has a protruding part protruding below the injection port, the The switch member is vertically slidably inserted into the switch groove on the protruding member.

Preferably, the front side of the switch groove is provided with a support piece accommodating groove, the front lower part of the switch member is connected with an elastic support member inclined forward and upward, and the elastic support member is provided with a support plate when a new needle is dropped. A supporting groove for supporting the root of the needle head, and the top of the front side of the supporting sheet accommodating groove has a rearwardly protruding extrusion for pressing the elastic supporting member to bend it backward when the switch member is lowered A pressing piece is fixed on the front upper part of the switch piece, and the pressing piece is provided with a downwardly open chute, and the chute and the elastic supporting piece inject the injection into the switch piece when the switch piece is lowered. The mouth squeezes the new needle that has fallen.

Preferably, the root of the needle has an annular groove, and when the root of the needle is pressed and connected to the injection port, the upper end of the elastic support member is pressed by the pressing portion until it is stuck in the annular groove. In the groove, when the switch member rises, the upper end of the elastic support member pushes the annular groove forward and upward to push out the used needle.

Preferably, the front sliding assembly includes a front arc plate supporting the core barrel and a connecting ring fixed on the front arc plate, and the front part of the core barrel is threadedly connected with the connecting ring to allow the injection The port protrudes forward, a sliding positioning column is fixedly connected under the connecting ring, and a limit groove for sliding cooperation with the sliding positioning column is arranged in the inner cavity of the housing, and the limiting groove is far away from the needle head. The rear end is provided with a quantitative adjustment mechanism, and the casing is fixed with a limit structure that restricts the rearward movement position of the sliding member. The quantitative adjustment mechanism controls the piston by adjusting the quantitative plate against the sliding positioning column back and forth. The moving distance relative to the core barrel when the medicinal liquid is drawn, and the front end of the limiting groove is used to limit the core barrel during injection.

Preferably, the quantitative adjustment mechanism further comprises a screw mounting member, an adjusting screw, a telescopic rod, a worm wheel, a worm and an adjusting knob, the screw mounting member is fixed in the housing, and a rotating connection is provided on the screw mounting member The adjusting screw is a through hole arranged in the front-rear direction, the front part of the adjusting screw is threaded and is threadedly connected with one end of the telescopic round rod that is slidably inserted into the through hole, and the other end of the telescopic round rod is fixed In connection with the quantitative plate, the worm wheel is installed on the protruding section at the rear of the adjustment screw, the worm is arranged in the left-right direction and is engaged with the worm wheel, and the extension end of the worm is connected with the adjustment knob.

Preferably, the medicine bottle and the sliding member are placed on a rear sliding assembly, the rear sliding assembly includes a rear arc plate and a medicine bottle support plate, the front end of the rear arc plate is fixedly connected to the sliding member, and the The medicine bottle support plate is slidably connected with the rear arc plate in an arc shape, and a sliding connection block is arranged on the lower side of the medicine bottle support plate, and the sliding connection block is slidably connected with the guide groove on the rear arc plate.

Preferably, at least one of the left and right sides of the inner cavity of the housing is hinged with a needle support plate and is provided with a support plate accommodating groove for accommodating the needle support plate. They are connected by a torsion spring, and the rear end of the support plate accommodating groove is used to abut the needle support plate to keep it left and right under the action of the torsion spring. For the needle, when the injection inner core moves forward, the needle support plate is pressed into the support plate accommodating groove.

Technical effects of the present invention: 1. In this solution, the one-way on-off valve and the switch element are provided, so that the injection port at the front end of the core barrel can prevent the air from entering during the process of changing the needle, and at the same time, the one-way on-off valve is closed. The device can also prevent the residual liquid from seeping out from the injection port or the needle due to thermal expansion. On the other hand, in this device, the liquid is sucked by the suction needle. Air is inhaled when the medicinal liquid is drawn, so the device prevents the air from entering the injection cavity and the leakage of residual liquid at the same time, overcomes the related problems in the prior art, facilitates the user to use the device to inject insulin and ensures that the device is not clean when it is inconvenient to clean. Does not cause liquid leakage.

2. In this scheme, the falling new needle is supported by the elastic support member and the needle head support plate. When the driving rod is pulled backward, the switch member is driven by the chute to descend through the sliding column, and then the switch member, the pressing member and the elastic support are passed. The synergistic action of the parts press-fits the root of the needle with the injection port, which not only ensures the reliability of the connection but also facilitates the operation, and the same action is used to remove the used needle. , using the cooperative action of the switch piece, the pressing piece and the elastic support piece, the old needle head is pushed out by the elastic support piece. Therefore, this solution realizes needle replacement by a simple operation of pulling the drive rod in one direction, and the above-mentioned action process and the opening and closing of the one-way on-off valve are coordinated through the switch element, and can also ensure the process of replacing the needle between the on-off states of the one-way on-off valve. Change accordingly to avoid errors that may result from separate operations.

3. The structure and use method of the injection core in this scheme cooperate with the quantitative adjustment mechanism provided by this scheme, which can accurately adjust the injection volume. The operation mode is relatively simple, and the rotation process is converted into a linear adjustment quantitative plate through two decelerations. Variations in the inhaled dose can thus be precisely adjusted.

Description of drawings

FIG. 1 is a schematic structural diagram of a medical device for diabetes treatment according to the present invention.

FIG. 2 is a schematic structural diagram of the injection core in the structure shown in FIG. 1 .

FIG. 3 is a cross-sectional view of the injection core in the structure shown in FIG. 1 after the injection core is enclosed by the upper outer shell and the inner shell.

FIG. 4 is a cross-sectional view of the structure shown in FIG. 3 in the direction A-A.

FIG. 5 is an enlarged view of the region A of the structure shown in FIG. 4 .

FIG. 6 is an enlarged view of the region B of the structure shown in FIG. 4 .

FIG. 7 is an enlarged view of the region C of the structure shown in FIG. 4 .

FIG. 8 is a schematic diagram of the chute and the sliding column in the structure shown in FIG. 4 in the storage state of the device.

FIG. 9 is a schematic view of the chute and the sliding column in the structure shown in FIG. 8 when a new needle is replaced.

Fig. 10 is a schematic view of the sliding groove and the sliding column in the structure shown in Fig. 8 when the needle is extended out of the housing.

FIG. 11 is a partial cross-sectional view of the structure shown in FIG. 1 from a side view.

The symbols in the drawings are: 1. Shell, 101, Upper shell, 102, Inner shell, 103, Chute, 1031, Low position groove, 1032, Transition groove, 1033, High position groove, 1034, Linear connection groove, 1035, second elastic block, 1036, first elastic block, 1037, partition, 104, needle support plate, 105, support groove, 106, limit structure, 107, watch case, 108, drive Groove, 2. Needle, 201, Needle body, 202, Root, 203, Protrusion, 204, Annular groove, 3. Injection core, 301, Core barrel, 302, Front arc plate, 303, Connecting ring, 304 , switch piece, 305, pressing piece, 306, elastic support piece, 307, protruding part, 3071, support piece accommodating groove, 3072, extrusion part, 308, sliding column, 309, sliding positioning column, 310, Piston Rod, 311, Slider, 312, Drive Rod, 313, Back Arc Plate, 3131, Medicine Bottle Holder, 3132, Guide Groove, 3133, Sliding Connection Block, 314, Medicine Bottle, 315, Suction Needle, 316, Check valve, 317, suction channel, 318, piston, 319, check valve, 3191, valve body, 3192, valve cavity, 3193, water inlet, 3194, membrane, 3195, valve plate, 3196, water outlet, 320, injection port, 4, needle supply box, 5, needle collection box, 6, trigger structure, 601, reel, 602, cable, 603, front pressure link, 7, quantitative adjustment mechanism, 701, quantitative plate, 702, telescopic rod, 703, screw mounting piece, 704, adjusting screw, 705, extension section, 706, worm gear, 707, worm.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, through the description of the embodiments, to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present invention.

As shown in Figures 1-11, the present invention provides a medical device for diabetes treatment, comprising a housing 1, the inner cavity of the housing 1 is provided with an injection inner core 301 that can move back and forth and is detachably installed in the housing 1. The needle 2 at the front end of the injection inner core 301 is also provided with a medicine bottle 314 for supplying the injection inner core 301 in the inner cavity of the outer casing 1 . The injection core 301 includes a core barrel 301, a piston 318, a piston rod 310, a sliding member 311 and a suction needle 315. The piston 318 is slidably arranged in the inner cavity of the core barrel 301, and the piston rod 310 is connected to On one side of the piston 318 and extending from one end of the core barrel 301, the other end of the core barrel 301 is provided with an injection port 320 connected to the needle 2, and the extended end of the piston rod 310 is connected to the One side of the sliding member 311, the other side of the sliding member 311 is installed with the liquid suction needle 315, the liquid suction needle 315 is inserted into the medicine bottle 314 to absorb the liquid medicine, and the sliding member 311 is provided with a protruding shell 1. A driving rod 312 used to drive the sliding member 311 to move, the suction needle 315 and the inner cavity of the core barrel 301 are communicated through a suction channel 317, and the injection port 320 is provided with One-way on-off valve 319 that flows in the direction of needle 2, the suction channel 317 is provided with a one-way valve 316 that only allows flow in the direction of the core barrel 301, and the one-way on-off valve 319 passes perpendicular to the injection core 301. The switch member 304 that moves in the moving direction controls the opening and closing. The switch member 304 is slidably connected to the core barrel 301 through a sliding structure. The switch member 304 is symmetrically fixed with protruding sliding columns 308 on the left and right sides. The inner side is provided with a chute 103 that cooperates with the sliding column 308 to drive the switch member 304 to rise and fall. Transition groove 1032, the transition groove 1032 is used to connect the low position groove 1031 and the high position groove 1033, the front part of the high position groove 1033 is at the position where the needle head 2 is replaced and the rear part is at the position where the new needle head 2 is replaced position, the middle of the high position groove 1033 is the stop position of the injection port 320 in the storage state.

The one-way switch valve 319 is a membrane valve, including a valve body 3191, a membrane 3194 and a valve plate 3195. The valve body 3191 is provided with a water inlet 3193, a water outlet 3196 and a valve cavity 3192, and the membrane 3194 is provided in the The valve cavity 3192 is covered on the water inlet 3193, the diameter of the water outlet 3196 is smaller than that of the membrane 3194 and protrudes toward the membrane 3194, and the valve plate 3195 is fixedly connected with the switch member 304 and extends from the bottom. The side sliding is inserted into the valve cavity 3192, and the valve plate 3195 and the valve body 3191 are kept sealed. In the open state, the membrane 3194 arches toward the water outlet 3196 to open the water inlet 3193, and when closed In the state, the valve plate 3195 is inserted and pressed against the membrane 3194 to close the water inlet 3193 .

The chute 103 further includes a straight connecting groove 1034 that is directly connected to the low position grooves 1031 at both ends. The front end of the portion 1037 is provided with a first elastic blocking piece 1036, and the other end is provided with a second elastic blocking piece 1035. The first elastic blocking piece 1036 seals the end of the linear connecting groove 1034 there in a natural state. The second elastic blocking piece 1035 closes the end of the corresponding transition groove 1032 there and opens when it is squeezed by the upper side in a natural state.

The front part of the core barrel 301 is detachably mounted on a front sliding assembly that slides in the inner cavity of the housing 1, and the front sliding assembly has a protruding part 307 that protrudes below the injection port 320, so the The switch member 304 is vertically slidably inserted into the switch slot on the protruding member 307 .

The front side of the switch slot is provided with a support piece accommodating slot 3071 , and the front lower part of the switch member 304 is connected with an elastic support member 306 inclined forward and upward. When supporting the root portion 202 of the needle head 2, the support groove 3071 has a front-side top of the support plate accommodating groove 3071 that protrudes backwards for squeezing the elastic support member 306 so that it can be placed on the switch member 304. A pressing part 3072 that bends backwards when descending, a pressing member 305 is fixed on the front upper part of the switch member 304, and the pressing member 305 is provided with a downwardly opening inclined groove, the inclined groove and the elastic support When the switch member 304 descends, the member 306 squeezes the dropped new needle 2 toward the injection port 320 .

The root portion 202 of the needle 2 has an annular groove 204. When the root portion 202 of the needle 2 is pressed and connected to the injection port 320, the upper end of the elastic support member 306 is pressed by the pressing portion 3072. Being stuck in the annular groove 204 , when the switch member 304 rises, the upper end of the elastic support member 306 pushes the annular groove 204 forward and upward to push out the used needle 2 .

The front sliding assembly includes a front arc plate 302 supporting the core barrel 301 and a connecting ring 303 fixed on the front arc plate 302. The front part of the core barrel 301 is threadedly connected to the connecting ring 303 and is The injection port 320 protrudes forward, a sliding positioning column 309 is fixedly connected under the connecting ring 303, and a limit groove for sliding cooperation with the sliding positioning column 309 is arranged in the inner cavity of the housing 1. A quantitative adjustment mechanism 7 is provided at the rear end of the limit groove away from the needle 2, and a limit structure 106 is fixed in the housing 1 to limit the rearward displacement of the sliding member 311. The quantitative adjustment mechanism 7 is adjusted forward and backward. The quantitative plate 701 against the sliding positioning column 309 controls the moving distance of the piston 318 relative to the core barrel 301 when absorbing the liquid medicine, and the front end of the limiting groove is used for the core barrel 301 during injection limit.

The quantitative adjustment mechanism 7 also includes a screw mount 703, an adjustment screw 704, a telescopic rod 702, a worm wheel 706, a worm 707 and an adjustment knob. The screw mount 703 is fixed in the housing 1, and the screw mount 703 is provided with a through hole rotatably connected to the adjusting screw 704 and arranged in the front-rear direction. The front part of the adjusting screw 704 is threaded and connected with one end of the telescopic rod 702 slidably inserted into the through hole. , the other end of the telescopic rod 702 is fixedly connected to the quantitative plate 701 , the worm wheel 706 is installed on the extension section 705 at the rear of the adjusting screw 704 , and the worm wheel 707 is arranged in the left-right direction and meshes with the worm wheel 706 , the extending end of the worm 707 is connected with the adjusting knob.

The case 1 includes an upper case 101 and a lower case 1 , the lower case 1 includes an inner case 102 and a watch case 107 , and the screw mounting member 703 is fixed on the inner case 102 and the watch case 107 In between, the upper casing 101 and the lower casing 1 are connected to form driving grooves 108 on the left and right sides for sliding engagement with the driving rod 312 .

The medicine bottle 314 and the sliding member 311 are placed on the rear sliding assembly. The rear sliding assembly includes a rear arc plate 313 and a medicine bottle support plate 3131. The front end of the rear arc plate 313 is fixedly connected to the sliding member 311. , the medicine bottle support plate 3131 is arc-shaped and is slidably connected to the rear arc plate 313, and the lower side of the medicine bottle support plate 3131 is provided with a sliding connection block 3133, the sliding connection block 3133 and the rear arc plate 313 The guide groove 3132 on the sliding connection.

At least one of the left and right sides of the inner cavity of the housing 1 is hinged with a needle support plate 104 and is provided with a support plate accommodating groove 105 for accommodating the needle support plate 104. The housings 1 are connected by a torsion spring, and the rear end of the support plate accommodating slot 105 is used to abut the needle support plate 104 to keep it left and right under the action of the torsion spring. The needle support plate 104 The needle head 2 is supported when it is set left and right, and the needle head support plate 104 is pressed into the support plate accommodating groove 105 when the injection inner core 301 moves forward.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as various insubstantial improvements made by the inventive concept and technical solutions of the present invention are adopted, or no improvement is made. The direct application of the concept and technical solutions of the present invention to other occasions falls within the protection scope of the present invention.

Claims (6)

1. A medical device for diabetes treatment, comprising a casing (1), an injection inner core (301) capable of moving back and forth is provided in the inner cavity of the casing (1) and a detachable installation on the injection inner core (301) The needle (2) at the front end, the inner cavity of the outer shell (1) is further provided with a medicine bottle (314) for supplying medicine to the injection inner core (301), characterized in that: the injection inner core (301) is characterized in that: (301) includes a core barrel (301), a piston (318), a piston rod (310), a sliding member (311) and a suction needle (315), the piston (318) is slidably arranged on the core barrel (301) In the inner cavity of the cylinder, the piston rod (310) is connected to one side of the piston (318) and protrudes from one end of the core barrel (301), and the other end of the core barrel (301) is provided with a connecting needle In the injection port (320) of (2), the protruding end of the piston rod (310) is connected to one side of the sliding member (311), and the suction needle is installed on the other side of the sliding member (311). (315), the liquid suction needle (315) is inserted into the medicine bottle (314) to absorb the liquid medicine, and the sliding member (311) is provided with a protruding housing (1) for driving the sliding member (311) The moving drive rod (312), the suction needle (315) and the inner cavity of the core barrel (301) are communicated through the suction channel (317), and the injection port (320) is provided with only a A one-way switch valve (319) that flows in the direction of the needle (2), the suction channel (317) is provided with a one-way valve (316) that only allows flow in the direction of the core barrel (301), the one-way switch The valve (319) is controlled to open and close by a switch member (304) that moves perpendicular to the movement direction of the injection core (301), and the switch member (304) is slidably connected to the core barrel (301) through a sliding structure, so On the left and right sides of the switch member (304), protruding sliding columns (308) are symmetrically fixed, and the inner side of the casing (1) is provided with a sliding groove (103) matched with the sliding column (308) for driving the The switch member (304) is lifted up and down, and the chute (103) includes a low position groove (1031) located in the front and rear parts, a high position groove (1033) located in the middle and an inclined transition groove (1032), the transition groove ( 1032) is used to connect the low position groove (1031) and the high position groove (1033), the front part of the high position groove (1033) is at the position where the needle head (2) is replaced and the rear part is at the position where the new needle head is replaced (2), the middle of the high-position groove (1033) is the stop position of the injection port (320) in the storage state; The one-way switch valve (319) is a membrane valve, including a valve body (3191), a membrane (3194) and a valve plate (3195). The valve body (3191) is provided with a water inlet (3193) and a water outlet (3196). ) and a valve cavity (3192), the membrane (3194) is set in the valve cavity (3192) and covered on the water inlet (3193), and the water outlet (3196) has a smaller aperture than the membrane (3194). ) and protrudes toward the membrane (3194), the valve plate (3195) is fixedly connected with the switch (304) and is slidably inserted into the valve cavity (3192) from the lower side, and the valve A seal is maintained between the plate (3195) and the valve body (3191). In the open state, the membrane (3194) arches toward the water outlet (3196) to open the water inlet (3193), and in the closed state, the valve After the plate (3195) is inserted, press the film (3194) to close the water inlet (3193); The front part of the core barrel (301) is detachably mounted on a front sliding assembly that slides in the inner cavity of the housing (1), the front sliding assembly has a protrusion extending below the injection port (320). a protruding part (307), the switch part (304) is vertically slidably inserted into a switch slot on the protruding part (307); The front side of the switch slot is provided with a support piece accommodating slot (3071), and the front lower part of the switch member (304) is connected with an elastic support member (306) inclined forward and upward, and the elastic support member (306) ) is provided with a support groove for supporting the root (202) of the needle head (2) when the new needle head (2) falls, and the top of the front side of the support piece accommodating groove (3071) has a rearward protrusion for pressing A pressing part (3072) that presses the elastic support member (306) to bend it backwards when the switch member (304) descends, a pressing member (305) is fixed on the front upper part of the switch member (304) , the pressing member (305) is provided with a downwardly opening inclined groove, and the inclined groove and the elastic supporting member (306) are directed to the injection port (320) when the switching member (304) descends Squeeze the falling new needle (2); The root (202) of the needle (2) has an annular groove (204), and when the root (202) of the needle (2) is press-connected with the injection port (320), the elastic supporting member The upper end of (306) is pressed by the pressing part (3072) to be stuck in the annular groove (204). The annular groove (204) is pressed from the front and top to push out the used needle (2). 2 . The medical device for diabetes treatment according to claim 1 , wherein the chute ( 103 ) further comprises a straight connecting groove ( 1034 ) that is linearly connected to the low-position groove ( 1031 ) at both ends. 3 . ), between the straight connecting groove (1034) and the high position groove (1033), there is a partition (1037) separating the two, the front end of the partition (1037) is provided with a first elastic blocking piece (1036) ), and the other end is provided with a second elastic blocking piece (1035), the first elastic blocking piece (1036) in the natural state seals the end of the linear connecting groove (1034) there, and after receiving The second elastic blocking piece (1035) closes the end of the corresponding transition groove (1032) at the position in a natural state and opens when it is squeezed from the upper side. 3. A medical device for diabetes treatment according to claim 2, wherein the front sliding assembly comprises a front arc plate (302) supporting the core barrel (301) and a front arc plate (302) fixed on the The connecting ring (303) on the front arc plate (302), the front part of the core barrel (301) is threadedly connected with the connecting ring (303) and the injection port (320) is protruded forward, the connection A sliding positioning column (309) is fixedly connected under the ring (303), and a limiting groove slidingly matched with the sliding positioning column (309) is provided in the inner cavity of the housing (1), and the limiting groove is far away from all the The rear end of the needle head (2) is provided with a quantitative adjustment mechanism (7). The mechanism (7) controls the moving distance of the piston (318) relative to the core barrel (301) when absorbing the medicinal liquid by adjusting the quantitative plate (701) against the sliding positioning column (309) back and forth. The front end of the position groove is used to limit the position of the core barrel (301) during injection. 4 . The medical device for diabetes treatment according to claim 3 , wherein the quantitative adjustment mechanism ( 7 ) further comprises a screw mounting member ( 703 ), an adjusting screw ( 704 ), a telescopic round rod ( 4 . 702), a worm gear (706), a worm (707) and an adjustment knob, the screw mounting piece (703) is fixed in the housing (1), and the screw mounting piece (703) is provided with a rotational connection to the adjustment knob A screw (704) is provided with a through hole along the front-rear direction, the front part of the adjusting screw (704) is threaded and connected with one end of the telescopic rod (702) slidably inserted into the through hole, the The other end of the telescopic rod (702) is fixedly connected to the quantitative plate (701), and the worm wheel (706) is installed on the protruding section (705) at the rear of the adjusting screw (704). The direction is set and meshed with the worm gear (706), and the adjustment knob is connected to the protruding end of the worm (707). 5. A medical device for diabetes treatment according to claim 4, characterized in that: the medicine bottle (314) and the sliding member (311) are placed on a rear sliding assembly, and the rear sliding assembly It includes a rear arc plate (313) and a medicine bottle support plate (3131), the front end of the rear arc plate (313) is fixedly connected with the sliding member (311), and the medicine bottle support plate (3131) is arc-shaped and The rear arc plate (313) is slidably connected, and a sliding connection block (3133) is provided on the lower side of the medicine bottle support plate (3131), and the sliding connection block (3133) is connected with the guide rails on the rear arc plate (313). Slot (3132) sliding connection. 6. A medical device for diabetes treatment according to claim 5, characterized in that: at least one of the left and right sides of the inner cavity of the housing (1) is hinged with a needle support plate (104) and There is a support plate accommodating groove (105) for accommodating the needle support plate (104), the needle support plate (104) and the housing (1) are connected by a torsion spring, the support plate accommodating groove The rear end of (105) is used to abut the needle support plate (104) to keep the left and right arrangement under the action of the torsion spring, and the needle support plate (104) supports the needle when it is arranged left and right (2) When the injection inner core (301) moves forward, the needle support plate (104) is pressed into the support plate accommodating groove (105).

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