CN220404565U - Manual insulin injection pen - Google Patents

Abstract

The utility model relates to an injection pen body for manually pushing insulin, which comprises a shell, wherein a scale adjusting sleeve is arranged in the shell, the upper part of the scale adjusting sleeve is a holding part and is positioned above the shell; the inner side of the upper part of the scale adjusting sleeve is provided with an excitation button, a lock rod and a spring in sequence from top to bottom; the inner side of the scale adjusting sleeve is connected with an adjusting screw sleeve and a push rod; the lower part of the adjusting screw sleeve is connected with an adjusting nut, the adjusting nut is fixed in the lower part of the shell, a rear cover is fixed below the adjusting nut, a screw rod is arranged in the rear cover in a penetrating way, the screw rod is in sliding connection with the push rod, the push rod is in sliding connection with the lock rod, and the scale adjusting sleeve is in sliding connection with the adjusting screw sleeve. The utility model meets the requirements of various design specifications of the insulin injection pen and is convenient to operate.

Description

Manual insulin injection pen

Technical Field

The utility model relates to an insulin injection pen body, in particular to an injection pen body adopting manual adjustment and metering and manual pushing injection, belonging to the technical field of injection pens of medical appliances.

Background

The diabetes patient needs to control the illness state by injecting insulin, in order to facilitate the operation, an insulin injection pen is used, the insulin is not extracted from an insulin medicine bottle by an injector, and the injection is directly implemented by adopting the injection pen with the pre-filled medicament, so that the convenience of insulin injection is improved, and the diabetes patient can operate by himself.

With the development of insulin injection pen technology, the current requirements for insulin injection pens already comprise (1) that small dose injections can be performed for multiple times, and the maximum single injection dose (60 IU) can be generally achieved for not less than 5 times; (2) The single injection dosage is convenient to adjust, the adjusting range is 0-60IU, and the adjusting precision is high (can reach 1 IU); (3) When the dosage is regulated, the graduations can be visually observed, and the injection pen can also make a sound so as to be convenient for patients with poor eyesight to operate by themselves; (4) During injection, the operation is simple, and the injection pen can make a sound in the injection process to indicate that the injection process is in progress. 1IU = 0.025ml.

Insulin manufacturers typically use pen injectors with a cartridge to pre-fill the insulin medication and then self-assemble the insulin medication into the injection pen for injection by the patient. The pen-type injector is a clip-type bottle, as shown in fig. 1, namely, the clip-type bottle is characterized in that the inner side of a borosilicate glass bottle body A is cylindrical, a rubber piston B is plugged into the clip-type bottle for sealing, a medicament C is filled in the bottle, and an injection pen quantitatively pushes out the medicament C from a bottle opening a (matched with a special needle fitting) by pushing the rubber piston B to inject the medicament C into a patient.

At present, a plurality of similar injection pens exist in the market, such as an insulin injection pen with a Chinese patent publication number of CN103170038A, an injection pen with a Chinese patent publication number of CN215653130U, a medical needle type injection system with a Chinese patent publication number of CN112023184A and the like; even an injection pen adopting a motor for injection, such as a full-automatic insulin injection method and an injection pen with the Chinese patent publication number of CN 114432543A.

Although a plurality of insulin injection pen products exist, the insulin injection pen products still need to be researched and developed so as to obtain an insulin pen meeting various standard requirements, and the insulin injection pen is convenient for a patient to operate and use.

Disclosure of Invention

The utility model aims to provide an injection pen body for manually pushing insulin so as to meet the requirements of related regulations and facilitate the operation and use of patients.

In order to achieve the aim of the utility model, the utility model provides an injection pen body for manually pushing insulin, which comprises a shell, wherein a scale adjusting sleeve is arranged in the shell, the upper part of the scale adjusting sleeve is a holding part and is positioned above the shell; the inner side of the upper part of the scale adjusting sleeve is provided with an excitation button, a lock rod and a spring in sequence from top to bottom; the inner side of the scale adjusting sleeve is connected with an adjusting screw sleeve and a push rod; the lower part of the adjusting screw sleeve is connected with an adjusting nut, the adjusting nut is fixed in the lower part of the shell, a rear cover is fixed below the adjusting nut, a screw rod is penetrated in the rear cover and is in sliding connection with the push rod, the push rod is in sliding connection with the lock rod, and the scale adjusting sleeve is in sliding connection with the adjusting screw sleeve;

outer casingA scale observation window is arranged on the shell; the inner side of the upper part of the shell is provided with a coarse thread; the inner side of the lower part of the shell is provided with an adjusting nut connecting structure body and a rear cover connecting structure body;

Scale adjusting sleeveThe upper part of the device is a holding part which is always positioned above the shell; the lower part of the scale adjusting sleeve is a spiral scale part, a coarse thread groove is formed in the scale adjusting sleeve, and the coarse thread groove is matched with the coarse thread to form coarse thread matching; the wall surface of the spiral graduation part is provided with a dose graduation, and the dose graduation can be observed and read through a graduation observation window;

the inner side of the upper part of the scale adjusting sleeve is provided with a driving lower ratchet which is arranged upwards; a button groove for installing the excitation button is arranged above the lower driving ratchet; a cavity for installing the head of the lock rod is also arranged between the button groove and the driving lower ratchet; a spring step for installing a spring is arranged in the lower direction of the lower driving ratchet;

the inner side of the lower part of the scale adjusting sleeve is provided with a mounting cavity for accommodating the adjusting screw sleeve; the installation cavity is provided with a guide groove for driving the adjusting screw sleeve to synchronously rotate;

excitation buttonThe top is a supply operationA pressing surface for pressing the finger; the vertical surface is a cylinder surface matched with the inner side wall surface of the upper part of the scale adjusting sleeve; the cylinder surface is provided with an installation convex ring which protrudes outwards, and the installation convex ring is embedded in the button groove; the width of the button groove is larger than that of the mounting convex ring; sound teeth are arranged on the inner side of the excitation button;

Lock rodThe upper part is a sliding guide part which is arranged on the inner side of the upper part of the scale adjusting sleeve and is positioned below the excitation button; the lower part of the sliding guide part is provided with a driving upper ratchet which is downwards arranged and is matched with a driving lower ratchet of the scale adjusting sleeve; spring teeth matched with the sound teeth in the excitation button are arranged above the sliding guide part;

the lower part of the lock rod is a rotary driving part, the main body of the lock rod is a driving cylinder, and a plurality of axially arranged bulges are arranged on the driving cylinder and are driving convex strips; the inner side of the driving cylinder is provided with an accommodating cavity for accommodating the screw rod;

springThe ratchet is positioned between the upper driving ratchet of the lock rod and the lower driving ratchet of the scale adjusting sleeve;

push rodThe device comprises a cylinder with two open ends, wherein the inner side of the cylinder is provided with a containing cavity for storing a rotary driving part of the lock rod, the wall surface of the containing cavity of the push rod is provided with a plurality of driving grooves, and the driving grooves are matched with driving convex strips on the lock rod to form a sliding guide rotary driving matching part;

the cylinder body of the push rod is provided with spring teeth; the bottom of the cylinder body of the push rod is provided with a connecting table; the inner side of the connecting table is communicated with the accommodating cavity above; the inner side of the connecting table is also internally provided with a driving bulge connected with the screw rod;

Adjusting screw sleeveThe main body is cylindrical, and the inner side of the cylinder is provided with a containing cavity for installing the push rod; the upper part of the barrel body of the adjusting screw sleeve is outwards provided with a plurality of raised driving convex strips which are matched with the guide grooves in the scale adjusting sleeve; forming a sliding guide rotation driving matching part; the lower part of the barrel body of the adjusting screw sleeve is outwards provided with continuous threads; the lower part of the inner side of the accommodating cavity of the adjusting screw sleeve is inwards protruded to form a sound tooth, and the spring tooth of the push rod is matched with the sound tooth of the adjusting screw sleeve to form a dose adjusting sound part; bottom of adjusting screw sleeveThe part forms a connecting sleeve which is matched with the connecting table of the push rod, and the connecting sleeve of the adjusting screw sleeve is connected with the connecting table of the push rod to form a rotary guiding longitudinal driving matching part;

adjusting nutThe device is fixed in the middle of the shell; the inner side of the adjusting nut is provided with a screw groove which is matched with the screw thread of the adjusting screw sleeve to form screw thread fit;

rear coverThe bottom of the shell is fixed; the inner side of the rear cover is provided with a driving screw groove;

screw rodThe rod body is provided with a driving thread which is matched with a driving screw groove of the rear cover to form fine thread matching; the pitch of the fine thread is smaller than that of the coarse thread; a driving groove is longitudinally formed in the rod body of the screw rod, and the driving groove of the screw rod is matched with the driving protrusion of the push rod to form a sliding guide rotary driving matching part;

The bottom of the screw is an injection working part;

the bottom of the shell or the bottom of the rear cover is provided with a mounting structure for connecting and assembling the clamping type bottle or the medicine bin.

As a further improvement of the utility model, the shell consists of two parts, namely a shell sleeve and a shell screw sleeve;

the outer shell is a thin-wall shell and comprises a shell, and a scale observation window is arranged on the shell; the scale observation window is a window which is formed by arranging a through hole on the shell;

the upper part of the shell sleeve is provided with a connecting structure body for connecting with the shell screw sleeve, and the connecting structure body comprises a shell screw sleeve connecting bayonet and a shell screw sleeve positioning convex strip;

the shell screw sleeve is a thin-wall shell and comprises a shell, and the diameter of the outer wall of the shell screw sleeve is matched with the inner diameter of the upper part of the shell; the shell body of the shell screw sleeve is also provided with a scale observation window, and the position of the scale observation window corresponds to the position of the scale observation window on the shell sleeve; the shell of the shell screw sleeve is provided with a connecting structure body for being installed into the shell sleeve, and the connecting structure body specifically comprises a shell screw sleeve connecting buckle which is matched with a shell screw sleeve connecting bayonet and a shell screw sleeve positioning groove which is matched with a shell screw sleeve positioning convex strip, wherein the shell screw sleeve positioning convex strip is clamped into the shell screw sleeve positioning groove, the shell screw sleeve connecting buckle is clamped into the shell screw sleeve connecting bayonet, and the positions of 2 scale observation windows are overlapped to form an internally-externally-through scale observation window;

The inner wall of the shell body of the shell screw sleeve is provided with a coarse thread.

Further, a limit table is arranged at the lower part of the inner wall of the shell screw sleeve, and the limit table is lower than the coarse threads of the shell screw sleeve;

the lower part bottom of the scale adjusting sleeve is radially provided with a limiting spring tooth, and the limiting spring tooth is outwards protruded and matched with the limiting table.

As a further improvement of the utility model, the lower part of the shell is provided with a connecting structure body for connecting with the adjusting nut and the rear cover, and the connecting structure body comprises a rear cover connecting bayonet, an adjusting nut positioning convex strip and a rear cover positioning convex strip;

a plurality of positioning grooves are formed in the cylinder body of the adjusting nut and are matched with the adjusting nut positioning convex strips and the rear cover positioning convex strips in the shell, and the adjusting nut positioning convex strips and the rear cover positioning convex strips are clamped into the positioning grooves of the adjusting nut one by one;

the top of the barrel body of the rear cover is a supporting table and supports the bottom of the adjusting nut, and the top of the adjusting nut is propped against the step on the inner side of the shell; the cylinder body of the rear cover is provided with a rear cover connecting buckle which is clamped with the rear cover connecting bayonet of the shell; the cylinder body of the rear cover is provided with a rear cover positioning groove which is clamped with the rear cover positioning convex strip of the shell.

As a further improvement of the utility model, the bottom of the scale adjusting sleeve is axially provided with convex teeth, and when the scale adjusting sleeve is in a retracted state, the convex teeth are propped against the upper surface of the adjusting nut.

As a further improvement of the utility model, the bottom of the connecting table of the push rod extends outwards to form a connecting flange; the connecting flange supports the connecting sleeve of the adjusting screw sleeve of the push rod.

As a further improvement of the utility model, an inward convex supporting bar is arranged on the inner side of the accommodating cavity of the push rod; the inner side of the supporting bar supports the outer wall of the screw rod.

As a further development of the utility model, the pitch of the screw thread fit between the adjusting nut and the adjusting screw sleeve is smaller than the pitch of the coarse screw thread fit.

As a further improvement of the utility model, the bottom of the cylinder body of the adjusting nut is downwards protruded to form convex teeth;

when the adjusting nut is positioned at the bottom, the convex teeth are propped against the upper surface of the rear cover.

As a further improvement of the utility model, the inner side of the rear cover is provided with a connecting structure for detachably connecting the medicine bin, and the driving screw groove is positioned above the connecting structure.

As a further improvement of the utility model, the bottom of the screw is provided with a connector which is connected with a push head;

the bottom of the push head is a push part which is an injection pushing work part;

the upper part of the push head is provided with a connecting part which is connected with the connecting head shape of the screw rod to form a rotary guiding longitudinal driving matching part.

The manual insulin injection pen body can be used after being assembled; when in use, the clamping bottle of the pre-filled insulin medicament is firstly filled into the medicament bin, and then the medicament bin is arranged at the end part of the injection pen body, in particular the screw rod or the push head is abutted against the piston of the clamping bottle; then corresponding injection needles are arranged on the needle connecting parts at the end parts of the medicine bin; finally, the pen cap is sleeved to shield the needle head, and the like, so that the portable pen is convenient to carry, store and transport.

When a patient needs to be injected, the injection dosage is firstly regulated, the shell is held by one hand, the holding part of the scale adjusting sleeve is held by the other hand, the scale adjusting sleeve is rotated, the thick screw groove is meshed with the thick screw thread of the shell to perform spiral ascending movement, and at the moment, the spiral scale part sequentially passes through the scale observation window, so that the adjusted scale is conveniently read. In the process of the spiral rising of the scale adjusting sleeve, the adjusting screw sleeve is driven to synchronously rotate through the cooperation of the guide groove and the driving convex strips, and the adjusting screw sleeve rotates, and the adjusting screw sleeve also can rise spirally due to the fact that the threads of the adjusting screw sleeve are meshed with the screw grooves of the fixed adjusting nut. At this time, the parts positioned on the inner side, the excitation button, the lock rod and the spring are arranged in the scale adjusting sleeve, and are transmitted by the force of the spring and can rise along with the rising, but do not synchronously rotate along with the rising, because the driving convex strip of the lock rod is inserted in the driving groove of the push rod, the push rod can rise along with the adjusting screw sleeve, but the two parts are connected in a rotation guiding way, the push rod is not driven to rotate, the screw rod is not rotated, and the push rod and the lock rod are not rotated; at this time, the push rod and the adjusting screw sleeve rotate relatively, and the spring tooth makes bouncing motion on the rattle tooth, so that rattle sound is generated, and the dosage adjustment is indicated.

The limiting spring tooth of the scale adjusting sleeve is propped against the limiting table when the dosage is adjusted to the maximum.

After the adjustment is finished, the pen cap is taken down, the shell is held, the needle is pricked into a patient, then the excitation button is pressed, the scale adjusting sleeve is pushed downwards, the injection of the medicament is realized, the excitation button is pressed due to the fact that the pressing surface of the excitation button is applied with pressure, the lock rod is synchronously pushed downwards to enable the spring to be compressed, the upper ratchet teeth are driven to be meshed with the lower ratchet teeth, and the lock rod synchronously rotates along with the scale adjusting sleeve and moves downwards; the driving convex strips of the lock rod are matched with the driving grooves of the push rod to drive the push rod to synchronously rotate; the push rod rotates, and the screw rod is driven to rotate through the cooperation of the driving protrusion and the driving groove of the screw rod; the driving thread of the screw rod is meshed with the driving thread groove of the fixed rear cover to drive the screw rod to move downwards in a spiral manner, so that the push head is driven to move downwards, namely the push head pushes the rubber piston of the clip-type bottle, and quantitative injection of the medicament is realized.

In the process, as the excitation button is pressed by the finger, the excitation button moves downwards, but does not rotate (friction force exists between the finger and the excitation button), and at the moment, the lock rod rotates, namely, the spring tooth and the rattle tooth relatively move, and further rattles to indicate that medicament injection is performed.

In-process scale adjustment sleeve spiral decline, until its dogtooth supports at adjusting nut's upper surface, and adjusting nut also synchronous spiral decline, until its dogtooth supports at the upper surface of back lid, through set up the dogtooth at the tip of two helices, can avoid the face contact to avoid the double screw locking. Finally, the injection is completed, the shell is held, the needle head is pulled out, and the pen cap is sleeved.

The injection dosage is readjusted when the injection is performed next time, and then the injection is performed; the patient may repeat the injection dose setting (different injection doses may be set each time depending on the morning, evening, etc.), and then perform the injection. In the process, the screw drives the push head to move downwards continuously, pushing the rubber piston to move downwards until the medicament in the clip-on bottle is injected cleanly.

After all injections are completed, the medicine bin is taken down, the push head is pushed reversely at the moment, the screw rod is rotated reversely to ascend for resetting, the rotation of the screw rod drives the push rod and the lock rod to rotate synchronously at the moment, but the rotation guide connection is adopted between the push rod and the adjusting screw sleeve, so that the adjusting screw sleeve cannot rotate, displacement cannot occur, the upper ratchet teeth driven by the lock rod are separated from the lower ratchet teeth driven by the scale adjusting sleeve, the scale adjusting sleeve cannot be driven to rotate, and displacement cannot occur. Until the screw rod and the push head are reset, the medicine bin of the clamp type bottle is replaced, and the clamp type bottle can be reused.

The manual insulin injection pen body meets various design specification requirements of the insulin injection pen, injection dosage is adjusted by adopting a mode that the scale adjusting sleeve is screwed out, and the pen body sounds in the adjustment process to indicate that dosage adjustment is performed; then the excitation button is pressed to push the scale adjusting sleeve to inject, and the injection process always sounds to indicate that the injection is being performed. After the injection of the medicament in the clip-type bottle is completed, the medicament bin is taken down to reset the push head and the screw rod.

The manual insulin injection pen body is convenient to operate.

Drawings

FIG. 1 is a schematic view of a cartridge for a pen injector;

FIG. 2 is a view showing the overall structure of the insulin injection pen in an unused state;

FIG. 3 is an internal cross-sectional view of FIG. 2;

FIG. 4 is a removable structural component of an insulin injection pen;

FIG. 5 is an overall outline view of the injection pen body for manually pushing insulin according to the present utility model;

FIG. 6 is an exploded view of the components of the manual insulin injection pen of the present utility model;

FIG. 7 is a schematic view of the overall structure of the outer shell;

FIG. 8 is a schematic view of the internal structure of the outer shell after being cut away;

FIG. 9 is a schematic view of the overall structure of the shell screw sleeve 1;

FIG. 10 is a schematic view of the overall structure of the shell screw sleeve 2;

FIG. 11 is a cross-sectional view of the housing insert;

FIG. 12 is a schematic view of the internal structure of the housing in an assembled state;

FIG. 13 is a schematic view of the overall structure of the scale adjustment sleeve 1;

FIG. 14 is a schematic view of the overall structure of the scale adjustment sleeve 2;

FIG. 15 is a schematic view of the internal structure of the scale adjustment sleeve after being cut away;

FIG. 16 is a schematic view of the overall structure of the actuator button 1;

FIG. 17 is a schematic view of the overall structure of the actuator button 2;

FIG. 18 is a schematic view of the internal structure of the actuator button in section;

FIG. 19 is a schematic view of the overall structure of the lock lever 1;

FIG. 20 is a schematic view of the overall structure of the lock lever 2;

FIG. 21 is a schematic view of the internal structure of the lock lever after being cut away;

FIG. 22 is a schematic view of the internal structure of the lock lever, the excitation button and the scale adjusting sleeve after being cut away in an assembled state;

FIG. 23 is a cross-sectional view of the assembled state of the lock lever, the excitation button and the scale adjustment sleeve;

FIG. 24 is a schematic view of the assembled combination of FIG. 22 and FIG. 12, shown in a cut-away internal configuration;

FIG. 25 is a schematic view of the entire structure of the push rod 1;

FIG. 26 is a schematic view of the overall structure of the push rod 2;

FIG. 27 is a schematic view of the internal structure of the push rod in section;

FIG. 28 is a schematic view of the internal structure of the push rod in an assembled state within the assembled component of FIG. 24;

FIG. 29 is a schematic view of the overall structure of the adjusting screw sleeve;

FIG. 30 is a schematic view of the internal structure of the adjusting screw sleeve after being cut away;

FIG. 31 is a schematic view of the overall structure of the adjusting nut 1;

FIG. 32 is a schematic view of the overall structure of the adjustment nut 2;

FIG. 33 is a schematic view of the internal structure of the adjusting nut after being cut away;

FIG. 34 is a schematic view of the internal structure of the assembled state of the adjuster nut and the adjuster nut after being cut away;

FIG. 35 is a schematic view of the internal structure of the assembled state of the composite member of FIG. 34 within the composite member of FIG. 28;

FIG. 36 is a schematic view of the overall structure of the rear cover;

FIG. 37 is a schematic view of the internal structure of the rear cover in section;

FIG. 38 is a schematic view of the overall structure of the screw;

FIG. 39 is a top view of the screw;

FIG. 40 is a schematic view of the overall structure of the pusher;

FIG. 41 is a schematic view of the overall structure of the assembled state of the screw in the rear cover;

FIG. 42 is a schematic view of the internal structure of the screw, the pusher and the rear cover in an assembled state;

FIG. 43 is a schematic view of the internal structure of the injection pen of the present utility model after being cut away 1;

FIG. 44 is a schematic view of the internal structure of the injection pen of the present utility model after being cut away 2;

FIG. 45 is a schematic view 1 of the overall structure of the drug cartridge;

FIG. 46 is a schematic view of the overall structure of the cartridge 2;

FIG. 47 is a schematic view of the process of dose adjustment of the manual insulin injection pen body of the present utility model when assembled into an insulin injection pen for use;

fig. 48 is a schematic diagram showing the injection process of the manual insulin injection pen body according to the present utility model when the manual insulin injection pen body is assembled into an insulin injection pen for use.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

As shown in fig. 2, the injection pen body for manually injecting insulin of the utility model is combined with the detachable medicine bin and other accessories, and is in an overall structure appearance diagram in a carrying unused state, wherein a pen cap 11 can be pulled out, and the exposed part of the injection pen body of the utility model is a shell 2, a scale adjusting sleeve 3 and a button part 4. As shown in fig. 3, which is a cross-sectional view of fig. 2, a cartridge 12 and a cartridge 13 (i.e., shown in fig. 1) are provided in the pen cap 11 at the front of the housing 2. As shown in fig. 4, the cap 11 is removable, exposing the cartridge 12; the cartridge 13 is further removable from the cartridge 12, and the cartridge 13 may be removed from the cartridge 12 for replacement, leaving only the injection pen. The key point of the utility model is to improve the structure of the injection pen body. The injection pen body is shown in figure 5, and all parts are shown in figure 6.

Shell 2Consists of two parts of a shell sleeve 21 and a shell screw sleeve 22; the outer shell 21 is shown in fig. 7 and 8, and the outer shell screw 22 is shown in fig. 9, 10 and 11.

The whole shell 21 is a thin-wall shell and comprises a shell 211, wherein a scale observation window 212 is arranged on the shell 211, and the scale observation window 212 is a window which is formed in the shell 211 in a penetrating way; the upper part of the shell sleeve 21 is provided with a connecting structure body for connecting with the shell screw sleeve 22, and the connecting structure body comprises a shell screw sleeve connecting bayonet 213 and a shell screw sleeve positioning convex strip 214; the lower part of the outer shell 21 is also provided with a connecting structure body for connecting with an adjusting nut and a rear cover, comprising a rear cover connecting bayonet 216, an adjusting nut positioning convex strip 217 (shorter) and a rear cover positioning convex strip 218 (longer); the connecting structures at the two ends are thickened shells, an interval is formed between the upper part and the lower part, and limiting surfaces 215 are respectively formed at the upper end and the lower end.

The shell screw sleeve 22 is also a thin-wall shell and comprises a shell 221, and the diameter of the outer wall of the shell 221 of the shell screw sleeve 22 is matched with the inner diameter of the upper part of the shell sleeve 21; the shell 221 of the shell screw sleeve 22 is also provided with a scale observation window 222, and the position of the scale observation window corresponds to the position of the scale observation window 212 on the shell sleeve 21; the shell 221 of the shell screw 22 is provided with a connecting structure body for being installed into the shell 21, and specifically comprises a shell screw connecting buckle 223 which is matched with the shell screw connecting bayonet 213, and a shell screw positioning groove 224 which is matched with the shell screw positioning convex strip 214, wherein the bottom of the shell screw positioning groove 224 is preferably provided with a guide opening 2241 (horn mouth); when the shell screw sleeve 22 is installed in the shell sleeve 21, the shell screw sleeve positioning convex strips 214 are clamped into the shell screw sleeve positioning grooves 224 along the guide openings 2241, the shell screw sleeve connecting buckles 223 squeeze the wall surface of the upper shell 211 of the shell sleeve 21 and enter the shell screw sleeve connecting bayonets 213, namely, the positioning and the assembly of the shell screw sleeve 22 in the shell sleeve 21 are realized, and at the moment, the positions of the 2 scale observation windows 212 and 222 are overlapped to form the scale observation windows 23 which are internally and externally communicated.

The inner wall of the housing 221 of the housing insert 22 is provided with a coarse thread 225.

A limit table 226 is provided at the lower portion of the inner wall of the case 221 of the housing 22.

Scale adjusting sleeve 3As shown in fig. 13, 14, and 15, the upper part is a grip 301, which is a protrusion for gripping; the lower part is a spiral graduation part 302, and a thick thread groove 303 is arranged on the lower part and matched with the thick thread 225; the wall surface of the spiral graduation portion 302 is provided with dose graduations along the thick groove 303, and can be observed and read through the graduation observation window 23.

The inner side of the upper part of the scale adjusting sleeve 3 is provided with a driving lower ratchet 304 which is arranged upwards; a button groove 305 for installing the excitation button 41 is arranged above the driving lower ratchet 304; a spring step 306 is provided in the lower direction of the driving lower ratchet 304 for mounting the spring 42.

The inner side of the lower part of the scale adjusting sleeve 3 is provided with a mounting cavity 307 for accommodating the adjusting screw sleeve 5; the installation cavity 307 is provided with a guide groove 308 for driving the adjusting screw 5 to rotate synchronously.

The lower bottom of the scale adjusting sleeve 3 is also provided with a limiting spring tooth 309 which is matched with the limiting table 226.

The bottom of the scale adjusting sleeve 3 is also provided with convex teeth 310 in an axial direction.

Excitation button 41As shown in fig. 16, 17 and 18, the whole body is in a cover shape, and the top is provided with a pressing surface 411 for pressing an operation finger; the vertical surface of the excitation button 41 is a cylinder surface 412 which is matched with the inner side wall surface of the upper part of the scale adjusting sleeve 3; the cylindrical surface 412 is provided with an outwardly protruding mounting flange 413, and the mounting flange 413 is embedded in the button groove 305, so that the excitation button 41 can be limited and mounted on the upper portion of the scale adjustment sleeve 3, and meanwhile, the width of the button groove 305 is larger than that of the mounting flange 413, so that the excitation button 41 can move up and down on the upper portion of the scale adjustment sleeve 3 along the cylindrical surface 412.

The top of the inner side of the excitation button 41 is provided with a column 414 downwards.

Inside the excitation button 41 is provided with ringing teeth 415.

Locking bar 43As shown in fig. 19, 20, and 21, the upper part is a slide guide 431, which is mounted on the upper inner side of the scale adjustment sleeve 3 and is located below the excitation button 41; the lower part of the sliding guide part 431 is provided with a driving upper ratchet 432 arranged downwards; the sliding guide portion 431 is provided with a half ring 433 above, and the ring 433 is provided with a radially outwardly protruding spring tooth 434, and the spring tooth 434 is matched with the sound tooth 415.

The lower part of the lock lever 43 is a rotary driving part, the main body of the lock lever is a driving cylinder 435, and a plurality of axially arranged bulges which are driving convex strips 436 are arranged on the driving cylinder 435; inside the drive cylinder 435 is a receiving cavity 437.

As shown in fig. 22 and 23, the spring 42 is put on the spring step 306 of the scale adjusting sleeve 3, then the driving cylinder 435 of the lock lever 43 passes through the spring 42 and the inner hole of the spring step 306, and the inner top of the slide guide 431 is pressed against the top of the spring 42; the trigger button 41 is aligned with the sliding guide portion 431 of the lock lever 43, the spring tooth 434 is matched with the sound tooth 415, the trigger button is pressed, the lock lever 43 is pushed to move downwards, the spring 42 is compressed until the mounting convex ring 413 is clamped into the button groove 305, and assembly is completed.

The assembly of fig. 22 and 23 is then installed into the housing 2, i.e. as shown in fig. 24, the teeth 310 on the scale-adjusting sleeve 3 are compressed inwardly so as not to protrude from the wall surface of the spiral scale portion 302 as much as possible during installation, and then the rough screw groove 303 of the scale-adjusting sleeve 3 is engaged with the rough screw 225 of the housing screw 22 to form a spiral fit therebetween. The scale adjusting sleeve 3 part of the shell 2 is the middle part of the shell sleeve 21, the inner side is a smooth cylinder surface, and the limiting spring tooth 309 is pressed on the cylinder surface; the large diameter of the front part of the limiting table 226 is connected with the middle cylinder surface of the outer shell 21, so that the limiting spring 309 can enter without obstacle until the limiting spring 309 meets the limiting table 226, namely, the limiting table is limited, the continuous spiral matching is prevented, and the scale adjusting sleeve 3 is screwed out.

Push rod 7As shown in fig. 25, 26 and 27, the cylinder body 701 is a cylinder with two open ends, the inner side of the cylinder body 701 is a containing cavity 702, and a wall surface of the containing cavity is provided with a plurality of driving grooves 703 which are matched with driving convex strips 436 on the lock lever 43.

The cylinder 701 of the push rod 7 is provided with spring teeth 704.

The bottom of the cylinder 701 of the push rod 7 is provided with a connecting table 705, and the bottom of the connecting table 705 extends outwards to form a connecting flange 706; the inner side of the connection table 705 is communicated with the accommodating cavity 702; the inner side of the connection table 705 is also provided with a driving protrusion 707 protruding inwards.

It is further preferred that an inwardly protruding support bar 708 is provided at the inner side of the receiving cavity 702 of the push rod 7.

As shown in fig. 28, the push rod 7 is assembled in the assembly shown in fig. 24, and the driving protrusion 436 of the lock rod 43 is inserted into the driving groove 703 of the push rod 7, so that the two parts are axially slidable relative to each other and are radially connected to each other for driving.

Adjusting screw sleeve 5As shown in fig. 29 and 30, the main body is cylindrical, and the inner side of the cylinder 501 is provided with a containing cavity 502; the upper part of the cylinder 501 is provided with a plurality of raised driving convex strips 503 outwards, which are matched with the guide grooves 308 in the scale adjusting sleeve 3; the lower portion of the barrel 501 is provided outwardly with continuous threads 504. The lower inside of the receiving cavity 502 is inwardly protruded to form a snag tooth 505. The bottom of the adjusting screw 5 forms a connecting sleeve 506 which is matched with the connecting table 705 of the push rod 7.

Adjusting nut 6As shown in FIG. 31, FIG. 32, and FIG.33, a cylinder body 601 is provided with a plurality of positioning grooves 602 which are matched with the adjusting nut positioning convex strips 217 and the rear cover positioning convex strips 218 in the outer shell 21, and a guiding opening 6021 (horn mouth) is arranged at the top of the positioning groove 602 for easy installation.

The inner side of the cylinder 601 is formed with a screw groove 603 matching the screw thread 504.

The bottom of the cylinder 601 protrudes downward to form a tooth 604.

The thread 504 of the adjusting screw sleeve 5 is screwed into the screw groove of the adjusting nut 6 to form a connection fit, i.e. as shown in fig. 34.

As further shown in fig. 35, the assembly shown in fig. 34 is incorporated into the assembly shown in fig. 28, so that the positioning grooves 602 of the adjustment nut 6 are all matched with the adjustment nut positioning protrusions 217 and the rear cover positioning protrusions 218 in the outer shell 21; simultaneously, the accommodating cavity 502 of the adjusting screw sleeve 5 is sleeved with the cylinder 701 of the push rod 7; further, the spring tooth 704 is snapped into the snapper 505 and the connection table 705 is snapped into the connection sleeve 506, the connection flange 706 is snapped over the connection sleeve 506 and underneath the connection sleeve 506, so that the push rod 7 is axially (longitudinally) connected with the adjustment screw 5, but is radially movable relative to each other, and upon relative movement, the spring tooth 704 cooperates with the snapper 505 and makes a clicking sound.

Rear cover 8As shown in fig. 36 and 37, the top of the cylinder 801 is a support table 802; the barrel 801 is provided with a rear cover connecting buckle 803 which is matched with the rear cover connecting bayonet 216; the barrel 801 is further provided with a rear cover positioning groove 804 which is matched with the rear cover positioning convex strip 218, and preferably, the top of the rear cover positioning groove 804 is provided with a guiding opening (horn mouth).

The inside of the top of the rear cover 8 is provided with a driving screw 805.

The inner side of the barrel 801 is provided with a connecting structure which is matched with the medicine bin 12 for detachable connection, and comprises a medicine bin connecting bayonet 806 and a medicine bin positioning groove 807.

Screw 91As shown in fig. 38 and 39, the rod body is provided with a driving thread 911 which is matched with the driving screw groove 805 and is a thin thread; the rod body is provided with a longitudinal driving groove 912912 is preferably provided with 2 strips. The end of the rod body is provided with a connector 913.

Push head 92As shown in fig. 40, it is attached to the end of the screw 91 and connected to the joint 913. The bottom of the push head 92 is a push part 921; the upper portion of push head 92 is connecting portion 922, and connecting portion 922's top inboard is via hole 923, and connecting portion 922's inboard is holding the chamber, holds one side in chamber and is equipped with through groove 924, through the longitudinal fit of groove 924 with connector 913, makes the big head part card of connector 913 go into holding the intracavity, and the little head part passes via hole 923, even push head 92 cooperatees with screw 91, realizes axial (longitudinal) link together between the two, but radial relative motion.

As shown in fig. 41 and 42, the screw 91 is screwed into the drive screw groove 805 of the rear cover, and the pusher 92 is engaged with the end of the screw 91.

Finally, the assembly shown in fig. 41 and 42 is assembled into the assembly shown in fig. 35, the driving grooves 912 on both sides of the screw 91 are connected with the driving protrusions 707 of the push rod 7, and the rod body of the screw 91 is supported by the supporting bars 708; further, the rear cover positioning groove 804 of the rear cover 8 is matched with the rear cover positioning convex strip 218 in the outer shell 21, and is pushed into the outer shell 21 until the rear cover connecting buckle 803 is blocked into the rear cover connecting bayonet 216, so as to realize fixation; the support stand 802 of the rear cover 8 also bears against the adjusting nut 6, which is likewise fixed in the outer shell 21. The inner and outer shell threaded sleeves 22, the adjusting nut 6 and the rear cover 8 of the outer shell 21 are completely fixed, namely, no axial relative displacement is generated, and no radial relative displacement is generated. As shown in fig. 43 and 44, the injection pen is assembled.

The manual insulin injection pen body can be used after being assembled; when in use, the card bottle 13 is firstly put into the medicine bin 12, then the mounting structure (see fig. 45 and 46 in detail) of the medicine bin 12 is aligned with the medicine bin connecting structure at the inner side of the rear cover 8, particularly the mounting column 122 is aligned with the inner wall of the rear cover 8, then the medicine bin positioning protrusion 123 is inserted with the medicine bin positioning groove 807, the medicine bin 12 is pushed into the injection pen body, and finally the medicine bin connecting buckle 124 is clamped into the medicine bin connecting bayonet 806, thus realizing the mounting; then corresponding injection needles are arranged on the needle connecting parts 125 at the end parts of the medicine bin 12; finally, the pen cap 11 is sleeved to shield the needle head and the like, so that the portable pen is convenient to carry, store and transport. Thus, a complete usable insulin injection pen is formed.

When the patient needs to inject, the injection dose is adjusted first, as shown in fig. 47, the housing 2 is held by one hand, the holding part 301 of the scale adjusting sleeve 3 is held by one hand, the scale adjusting sleeve 3 is rotated, the rough screw groove 303 is meshed with the rough screw 225 of the housing 2, and the spiral ascending movement is performed, and at this time, the spiral scale part 302 sequentially passes through the scale observation window 23, so that the adjusted scale is conveniently read. In the process of the spiral rising of the scale adjusting sleeve 3, the guide groove 308 and the driving convex strip 503 are matched to drive the adjusting screw sleeve 5 to synchronously rotate, so that the adjusting screw sleeve 5 rotates, the screw thread 504 of the adjusting screw sleeve 5 is meshed with the screw groove 603 of the fixed adjusting nut 6, the adjusting screw sleeve 5 also can be spirally rising, but the rising distance of the adjusting screw sleeve 5 is smaller than that of the scale adjusting sleeve 3 because the screw pitch of the screw thread on the adjusting screw sleeve 5 is smaller than that of the scale adjusting sleeve 3. At this time, the parts located inside, the trigger button 41, the lock lever 43, and the spring 42 are installed in the scale adjustment sleeve 3, and are transferred by the force of the spring 42 to rise along with, but not rotate synchronously, because the driving convex strip 436 of the lock lever 43 is inserted in the driving groove 703 of the push rod 7, the push rod 7 rises along with the adjusting screw sleeve 5, but the two are connected in a rotating way, the push rod 7 is not driven to rotate, the screw 91 is not rotated, and the push rod 7 and the lock lever 43 are not rotated as well; at this point, the push rod 7 and the adjustment screw sleeve 5 are rotated relatively, and the spring tooth 704 is in bouncing motion on the rattle tooth 505, and then rattles, indicating that dose adjustment is being performed.

The dose is adjusted up to the limit spring 309 of the scale adjusting sleeve 3 against the limit table 226.

After the adjustment is finished, the pen cap 11 is taken down, the shell 2 is held, the needle is pricked into a patient, then the excitation button 41 is pressed, the scale adjusting sleeve 3 is pushed downwards, and the injection of medicament is realized, as shown in fig. 48, as the pressing surface 411 of the excitation button 41 is applied with pressure, the excitation button 41 is pressed, the lock rod 43 is synchronously pushed downwards to compress the spring 42, the upper ratchet 432 is driven to be meshed with the lower ratchet 304, and the lock rod 43 synchronously rotates along with the scale adjusting sleeve 3 and moves downwards; the driving convex strip 436 of the lock rod 43 is matched with the driving groove 703 of the push rod 7 to drive the push rod 7 to synchronously rotate; the rotation of the push rod 7 drives the screw 91 to rotate by the cooperation of the driving protrusion 707 and the driving groove 912 of the screw 91; the driving screw 911 of the screw 91 is meshed with the driving screw groove 805 of the fixed rear cover 8, so that the screw 91 is driven to move downwards in a spiral manner, and then the push head 92 is driven to move downwards, namely the push head 92 pushes the rubber piston B of the cartridge bottle 13, so that quantitative injection of the medicament is realized; the screw 91 is screwed down because the push head 92 and the screw 91 have a degree of freedom of rotational connection, but the push head 92 does not rotate with the screw 91 due to radial friction with the rubber piston B, and only axial movement is provided.

During this process, as the trigger button 41 is held down by a finger, the trigger button 41 moves downward but does not rotate, and at this time the lock lever 43 is in rotational motion, i.e., the spring tooth 434 and the rattle tooth 415 move relative to each other, thereby making a "rattle" sound indicating that a medicament injection is being performed.

In the process, the scale adjusting sleeve 3 is spirally lowered until the convex teeth 310 of the scale adjusting sleeve are abutted against the upper surface of the adjusting nut 6, the adjusting nut 6 is synchronously spirally lowered until the convex teeth 604 of the scale adjusting sleeve are abutted against the upper surface of the rear cover 8, and surface contact can be avoided by arranging the convex teeth at the end parts of the two spirals, so that double-thread locking is avoided. Finally, the injection is completed, the housing 2 is held, the needle is pulled out, and the pen cap 11 is sleeved.

The injection dosage is readjusted when the injection is performed next time, and then the injection is performed; in the process, the screw 91 continuously descends in a spiral manner, and the push head 92 pushes the rubber piston B of the cartridge 13 to continuously downwards until the medicament in the cartridge 13 is completely injected. After all injections are completed, the medicine bin 12 is taken down, the push head 92 is pushed reversely at this moment, the screw 91 is rotated reversely and ascended for resetting, at this moment, the rotation of the screw 91 drives the push rod 7 and the lock rod 43 to rotate synchronously, but because the push rod 7 is connected with the adjusting screw sleeve 5 in a rotating way, the adjusting screw sleeve 5 cannot rotate, displacement cannot occur, the upper driving ratchet 432 of the lock rod 43 is separated from the lower driving ratchet 304 of the scale adjusting sleeve 3, the scale adjusting sleeve 3 cannot be driven to rotate, and the scale adjusting sleeve 3 cannot displace. Until the screw 91 and the push head 92 are reset, the medicine compartment 12 of the cartridge 13 is replaced.

The manual insulin injection pen body meets various design specification requirements of the insulin injection pen, injection dosage is adjusted by adopting a mode that the scale adjusting sleeve 3 is screwed out, and the pen body sounds in the adjustment process to indicate that dosage adjustment is performed; then the trigger button 41 is pressed to push the scale adjustment sleeve 3 for injection, and the injection process always sounds to indicate that the injection is being performed. After the injection of the medicine in the cartridge 13 is completed, the push head 92 and the screw 91 can be reset by removing the medicine compartment 12.

The manual insulin injection pen body is convenient to operate.

While the preferred embodiments of the present utility model have been illustrated and described, the present utility model is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. The injection pen body for manually pushing insulin is characterized by comprising a shell, wherein a scale adjusting sleeve is arranged in the shell, the upper part of the scale adjusting sleeve is a holding part and is positioned above the shell;

The inner side of the upper part of the scale adjusting sleeve is provided with an excitation button, a lock rod and a spring in sequence from top to bottom;

the inner side of the scale adjusting sleeve is connected with an adjusting screw sleeve and a push rod;

the lower part of the adjusting screw sleeve is connected with an adjusting nut, the adjusting nut is fixed in the lower part of the shell, a rear cover is fixed below the adjusting nut, a screw rod is penetrated in the rear cover and is in sliding connection with the push rod, the push rod is in sliding connection with the lock rod, and the scale adjusting sleeve is in sliding connection with the adjusting screw sleeve;

outer casingA scale observation window is arranged on the shell; outer casingThe inner side of the upper part of the sleeve is provided with a coarse thread; the inner side of the lower part of the shell is provided with an adjusting nut connecting structure body and a rear cover connecting structure body;

scale adjusting sleeveThe upper part of the device is a holding part which is always positioned above the shell; the lower part of the scale adjusting sleeve is a spiral scale part, a coarse thread groove is formed in the scale adjusting sleeve, and the coarse thread groove is matched with the coarse thread to form coarse thread matching; the wall surface of the spiral graduation part is provided with a dose graduation, and the dose graduation can be observed and read through a graduation observation window;

the inner side of the upper part of the scale adjusting sleeve is provided with a driving lower ratchet which is arranged upwards; a button groove for installing the excitation button is arranged above the lower driving ratchet; a cavity for installing the head of the lock rod is also arranged between the button groove and the driving lower ratchet; a spring step for installing a spring is arranged in the lower direction of the lower driving ratchet;

The inner side of the lower part of the scale adjusting sleeve is provided with a mounting cavity for accommodating the adjusting screw sleeve; the installation cavity is provided with a guide groove for driving the adjusting screw sleeve to synchronously rotate;

excitation buttonThe top is a pressing surface for pressing the operation finger; the vertical surface is a cylinder surface matched with the inner side wall surface of the upper part of the scale adjusting sleeve; the cylinder surface is provided with an installation convex ring which protrudes outwards, and the installation convex ring is embedded in the button groove; the width of the button groove is larger than that of the mounting convex ring; sound teeth are arranged on the inner side of the excitation button;

lock rodThe upper part is a sliding guide part which is arranged on the inner side of the upper part of the scale adjusting sleeve and is positioned below the excitation button; the lower part of the sliding guide part is provided with a driving upper ratchet which is downwards arranged and is matched with a driving lower ratchet of the scale adjusting sleeve; spring teeth matched with the sound teeth in the excitation button are arranged above the sliding guide part;

the lower part of the lock rod is a rotary driving part, the main body of the lock rod is a driving cylinder, and a plurality of axially arranged bulges are arranged on the driving cylinder and are driving convex strips; the inner side of the driving cylinder is provided with an accommodating cavity for accommodating the screw rod;

springThe ratchet is positioned between the upper driving ratchet of the lock rod and the lower driving ratchet of the scale adjusting sleeve;

Push rodThe device comprises a cylinder with two open ends, wherein the inner side of the cylinder is provided with a containing cavity for storing a rotary driving part of the lock rod, the wall surface of the containing cavity of the push rod is provided with a plurality of driving grooves, and the driving grooves are matched with driving convex strips on the lock rod to form a sliding guide rotary driving matching part;

the cylinder body of the push rod is provided with spring teeth; the bottom of the cylinder body of the push rod is provided with a connecting table; the inner side of the connecting table is communicated with the accommodating cavity above; the inner side of the connecting table is also internally provided with a driving bulge connected with the screw rod;

adjusting screw sleeveThe main body is cylindrical, and the inner side of the cylinder is provided with a containing cavity for installing the push rod; the upper part of the barrel body of the adjusting screw sleeve is outwards provided with a plurality of raised driving convex strips which are matched with the guide grooves in the scale adjusting sleeve; forming a sliding guide rotation driving matching part; the lower part of the barrel body of the adjusting screw sleeve is outwards provided with continuous threads; the lower part of the inner side of the accommodating cavity of the adjusting screw sleeve is inwards protruded to form a sound tooth, and the spring tooth of the push rod is matched with the sound tooth of the adjusting screw sleeve to form a dose adjusting sound part; the bottom of the adjusting screw sleeve is provided with a connecting sleeve which is matched with the connecting table of the push rod, and the connecting sleeve of the adjusting screw sleeve is connected with the connecting table of the push rod to form a rotary guiding longitudinal driving matching part;

Adjusting nutThe device is fixed in the middle of the shell; the inner side of the adjusting nut is provided with a screw groove which is matched with the screw thread of the adjusting screw sleeve to form screw thread fit;

rear coverThe bottom of the shell is fixed; the inner side of the rear cover is provided with a driving screw groove;

screw rodThe rod body is provided with a driving thread which is matched with a driving screw groove of the rear cover to form fine thread matching; the pitch of the fine thread is smaller than that of the coarse thread; a driving groove is longitudinally formed in the rod body of the screw rod, and the driving groove of the screw rod is matched with the driving protrusion of the push rod to form a sliding guide rotary driving matching part;

the bottom of the screw is an injection working part;

the bottom of the shell or the bottom of the rear cover is provided with a mounting structure for connecting and assembling the clamping type bottle or the medicine bin.

2. The manual insulin injection pen according to claim 1, wherein the housing comprises a housing sleeve and a housing screw sleeve;

the outer shell is a thin-wall shell and comprises a shell, and a scale observation window is arranged on the shell; the scale observation window is a window which is formed by arranging a through hole on the shell;

the upper part of the shell sleeve is provided with a connecting structure body for connecting with the shell screw sleeve, and the connecting structure body comprises a shell screw sleeve connecting bayonet and a shell screw sleeve positioning convex strip;

The shell screw sleeve is a thin-wall shell and comprises a shell, and the diameter of the outer wall of the shell screw sleeve is matched with the inner diameter of the upper part of the shell; the shell body of the shell screw sleeve is also provided with a scale observation window, and the position of the scale observation window corresponds to the position of the scale observation window on the shell sleeve; the shell of the shell screw sleeve is provided with a connecting structure body for being installed into the shell sleeve, and the connecting structure body specifically comprises a shell screw sleeve connecting buckle which is matched with a shell screw sleeve connecting bayonet and a shell screw sleeve positioning groove which is matched with a shell screw sleeve positioning convex strip, wherein the shell screw sleeve positioning convex strip is clamped into the shell screw sleeve positioning groove, the shell screw sleeve connecting buckle is clamped into the shell screw sleeve connecting bayonet, and the positions of 2 scale observation windows are overlapped to form an internally-externally-through scale observation window;

the inner wall of the shell body of the shell screw sleeve is provided with a coarse thread.

3. The injection pen for manually pushing insulin according to claim 2, wherein a limit table is arranged at the lower part of the inner wall of the shell screw sleeve, and the limit table is lower than the coarse thread of the shell screw sleeve;

the lower part bottom of the scale adjusting sleeve is radially provided with a limiting spring tooth, and the limiting spring tooth is outwards protruded and matched with the limiting table.

4. The manual insulin injection pen according to claim 1, wherein the lower part of the housing is provided with a connecting structure for connecting the adjusting nut and the rear cover, comprising a rear cover connecting bayonet, an adjusting nut positioning convex strip and a rear cover positioning convex strip;

A plurality of positioning grooves are formed in the cylinder body of the adjusting nut and are matched with the adjusting nut positioning convex strips and the rear cover positioning convex strips in the shell, and the adjusting nut positioning convex strips and the rear cover positioning convex strips are clamped into the positioning grooves of the adjusting nut one by one;

the top of the barrel body of the rear cover is a supporting table and supports the bottom of the adjusting nut, and the top of the adjusting nut is propped against the step on the inner side of the shell; the cylinder body of the rear cover is provided with a rear cover connecting buckle which is clamped with the rear cover connecting bayonet of the shell; the cylinder body of the rear cover is provided with a rear cover positioning groove which is clamped with the rear cover positioning convex strip of the shell.

5. The injection pen for manually pushing insulin according to claim 1, wherein the bottom of the scale adjusting sleeve is axially provided with convex teeth, and the convex teeth are abutted against the upper surface of the adjusting nut when the scale adjusting sleeve is in a retracted state;

the bottom of the cylinder body of the adjusting nut protrudes downwards to form convex teeth;

when the adjusting nut is positioned at the bottom, the convex teeth are propped against the upper surface of the rear cover.

6. The manually pushed insulin injection pen according to claim 1, wherein the bottom of the connecting table of the push rod is extended outwards to form a connecting flange; the connecting flange supports the connecting sleeve of the adjusting screw sleeve of the push rod.

7. The manual insulin injection pen according to claim 1, wherein an inwardly protruding support bar is provided at an inner side of the receiving chamber of the push rod; the inner side of the supporting bar supports the outer wall of the screw rod.

8. The manually propelled insulin injection pen of claim 1, wherein the thread pitch of the threaded engagement between the adjustment nut and the adjustment screw is smaller than the thread pitch of the coarse thread engagement.

9. The manual insulin injection pen according to claim 1, wherein the inner side of the rear cover is provided with a connecting structure for detachably connecting the medicine compartment, and the driving screw groove is positioned above the connecting structure.

10. The injection pen for manually pushing insulin according to claim 1, wherein the bottom of the screw is provided with a connector connected with a pushing head;

the bottom of the push head is a push part which is an injection pushing work part;

the upper part of the push head is provided with a connecting part which is connected with the connecting head shape of the screw rod to form a rotary guiding longitudinal driving matching part.