A pen-type syringe

Abstract

The present invention discloses a pen-type syringe, which relates to the technical field of syringes. In the present invention, the inner syringe is clamped and fixedly installed inside the push-pull control assembly, and the inner syringe is clamped and fixedly installed inside the push-pull control cylinder. The circumferential side of the push-pull control cylinder is provided with an automatically replenishing tube that can move radially. The first connecting portion is arranged on one side of the push-pull control cylinder, and the first connecting portion moves along the axial direction of the push-pull control cylinder. The pressing plate fixed to one end of the push-pull piston rod fits on the first connecting portion. The first elastic member is fixedly installed outside the push-pull control cylinder, and the first elastic member is arranged along the axial direction of the push-pull control cylinder. By respectively arranging each positioning part at different quadrant points in the present invention, the axial distances between the first positioning part and the second positioning part, between the second positioning part and the third positioning part, and between the third positioning part and the fourth positioning part are the same. When pressing the push-pull piston rod, the same dose of liquid medicine can be discharged to complete the injection.

Description

Technical Field

[0001] The present invention belongs to the technical field of syringes, and particularly relates to a pen-type syringe. Background Art

[0002] A syringe consists of a barrel with a small hole at the front end and a piston rod that matches it. It is used to inject a small amount of liquid into areas that cannot be accessed by other methods or to draw out from those places. When the piston rod is pulled out, the liquid or gas is sucked into the barrel through the small hole at the front end of the barrel, and when the piston rod is pushed in, the liquid or gas is extruded. The pen-type syringe is one of the commonly used syringes and gets its name because its shape is similar to a pen.

[0003] In the prior art, after a general pen-type syringe sucks the medicinal liquid, most of them achieve the purpose of quantitative injection by directly observing the scale line. During the process of quantitative injection, it is easy to cause deviation in the injection of the medicinal liquid due to visual observation by the naked eye. At the same time, the existing pen-type syringe needs to suck the medicinal liquid again after completing one injection, and cannot achieve the purpose of continuous injection of the medicinal liquid. For this reason, we provide a pen-type syringe to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a pen-type syringe, which solves the problems in the above background art through the specific structural design of an automatic liquid replenishing port, a push-pull control component, and a quantitative component.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention is a pen-type syringe, including an inner syringe and a push-pull control component. The inner syringe includes a push-pull piston rod. The inner syringe is clamped and fixedly installed inside the push-pull control component, and the push-pull control component is coaxially arranged with the inner syringe. Among them, the push-pull control component includes a push-pull control cylinder. The inner syringe is clamped and fixedly installed inside the push-pull control cylinder. An automatically replenishing tube that can move radially is arranged on the circumferential side of the push-pull control cylinder. The automatically replenishing tube is inserted and cooperated with the inner syringe and the two are communicated. A first connecting part is arranged on one side of the push-pull control cylinder, and the first connecting part moves along the axis direction of the push-pull control cylinder. A pressing disc fixed at one end of the push-pull piston rod is attached to the first connecting part. And a first elastic member is fixedly installed outside the push-pull control cylinder, and the first elastic member is arranged along the axis direction of the push-pull control cylinder. When controlling the first connecting part to move towards the direction close to the push-pull control cylinder, the first elastic member is compressed by force. When the injection is completed, the first connecting part is driven to move in the reverse direction and reset by the elastic force of the first elastic member, and the push-pull piston rod is pushed to complete the reset through the first connecting part, and the external medicinal liquid flows into the inner syringe along the automatically replenishing tube by gravity.

[0007] The present invention is further configured such that the end of the push-pull control cylinder close to the first connection portion is provided with an open structure, the end of the push-pull control cylinder far from the first connection portion is provided with a central mounting opening, an axial adjustment cavity coaxial with the circumferential side surface of the push-pull control cylinder is provided, and a plurality of axial slideways are arranged in a circumferential array inside the axial adjustment cavity, and each of the axial slideways communicates with the inner cavity of the push-pull control cylinder.

[0008] The present invention is further configured such that radial moving rods corresponding to the axial slideways one by one are slidably arranged on the circumferential side surface of the push-pull control cylinder, a connecting disk fixed to one end of the radial moving rod is connected to the push-pull control cylinder through a second elastic member, and a clamping portion is fixedly arranged at the other end of the radial moving rod; the inner syringe further includes an inner syringe barrel, the inner syringe barrel is coaxially arranged inside the push-pull control cylinder and is clamped and fixed by each clamping portion, an axial pushing portion corresponding to the clamping portion one by one is axially slidably arranged on the inner wall of the push-pull control cylinder, the axial pushing portion and the corresponding clamping portion are hinged and matched through an inclined connecting rod, and an axial moving rod slidably matched in the corresponding axial slideway is fixedly arranged on the surface of the axial pushing portion.

[0009] The present invention is further configured such that a quantitative adjustment ring coaxial with it is rotatably arranged at the end of the push-pull control cylinder close to the first connection portion, an axial linkage rod extending into the push-pull control cylinder is slidably arranged on the quantitative adjustment ring, the first connection portion is fixedly installed on the circumferential side surface of the axial linkage rod, a second connection portion is fixedly arranged at one end of the axial linkage rod, an axial support portion is fixedly arranged on the side of the quantitative adjustment ring far from the first connection portion, a mounting plate is fixedly arranged at the end of the axial support portion, and the first elastic member is connected between the mounting plate and the second connection portion.

[0010] The present invention is further configured such that a U-shaped mounting portion is fixedly installed on the circumferential side surface of the push-pull control cylinder, a positioning and guiding portion is fixedly arranged on the surface of the U-shaped mounting portion, a clamping control ring that fits with each axial moving rod in a threaded manner is arranged inside the axial adjustment cavity, a support ring is rotatably arranged on the side of the clamping control ring far from the axial moving rod, and a driving rotation rack that slidably cooperates with the positioning and guiding portion is connected to the surface of the support ring through a support rod.

[0011] The present invention is further configured such that the automatic liquid supplementing tube is slidably installed on the U-shaped mounting portion and penetrates into the push-pull control cylinder, an automatic liquid supplementing port that is inserted and cooperated with the automatic liquid supplementing tube is provided on the circumferential side surface of the inner syringe barrel, a guiding rod is fixedly arranged on the surface of the U-shaped mounting portion, a moving portion that is slidably sleeved on the guiding rod is fixedly installed on the circumferential side surface of the automatic liquid supplementing tube, and an inserting control gear that meshes with the driving rotation rack is rotatably arranged on the surface of the U-shaped mounting portion, and the inserting control gear is sleeved on the automatic liquid supplementing tube and the two are in threaded cooperation.

[0012] The present invention is further configured such that the present invention further includes a metering component, the metering component is fixedly installed inside the push-pull control cylinder, and the metering component is sleeved outside the inner syringe barrel; wherein, the metering component includes a fixing ring fixedly installed inside the push-pull control cylinder, and the surface of the fixing ring is fixedly connected with a first positioning portion, a second positioning portion, a third positioning portion, and a fourth positioning portion respectively through support rods, and the first positioning portion, the second positioning portion, the third positioning portion, and the fourth positioning portion are all arranged in an arc structure; the first positioning portion, the second positioning portion, the third positioning portion, and the fourth positioning portion are respectively arranged at different quadrant points, and the axial distances between the first positioning portion and the second positioning portion, between the second positioning portion and the third positioning portion, and between the third positioning portion and the fourth positioning portion are the same.

[0013] The present invention has the following beneficial effects:

[0014] By arranging the first positioning portion, the second positioning portion, the third positioning portion, and the fourth positioning portion at different quadrant points respectively, and the axial distances between the first positioning portion and the second positioning portion, between the second positioning portion and the third positioning portion, and between the third positioning portion and the fourth positioning portion being the same, when pressing the push-pull piston rod, the same dose of liquid medicine can be discharged to complete the injection, without the need to re-aspirate after a single injection to continue the injection, thereby greatly improving the efficiency of liquid medicine injection.

[0015] When it is necessary to change the injection amount of the liquid medicine in the present invention, by rotating the metering control ring so that the pressing portion is aligned with the corresponding position of the second positioning portion, after opening the control valve to deliver a certain amount of liquid medicine into the inner syringe barrel, control the axial linkage rod to slide towards the inner side of the push-pull control cylinder until the pressing portion at the end of the axial linkage rod abuts against the first positioning portion. At this time, a certain amount of liquid medicine in the inner syringe barrel can be discharged to complete the injection. After the liquid medicine injection is completed, release the push-pull piston rod so that the injection piston returns to the initial position. At this time, the pressing portion at the end of the axial linkage rod abuts against the metering control ring again. After opening the control valve again to replenish the liquid medicine in the inner syringe barrel, the same injection method can be used to continue the liquid medicine injection. Thus, continuous injection can be achieved. In the same adjustment method, the pressing portion can be adjusted to the positions of the third positioning portion and the fourth positioning portion, and thus quantitative injection of different doses of liquid medicine can be achieved.

[0016] After completing a liquid medicine injection, the present invention gradually releases the pressure on the pressure plate at the end of the push-pull piston rod, and under the action of the elastic restoring force of the first elastic member, the first connecting part moves in the opposite direction and resets. In this process, the pressure plate at the end of the push-pull piston rod is pushed by the first connecting part, so that the push-pull piston rod is pulled toward the outside of the inner syringe to realize the reset of the push-pull piston rod. Subsequently, the control valve is opened again to transport a certain amount of liquid medicine into the inner syringe, and then the control valve is closed and the pressure plate at the end of the push-pull piston rod is pressed again to make the first connecting part move synchronously, so that the first elastic member is gradually compressed until the first connecting part is pressed against the quantitative control ring. At this time, the injection piston on the push-pull piston rod discharges all the liquid medicine in the inner syringe to complete the injection. After the injection is completed, the push-pull piston rod is released to complete its reset. In this way, the continuous operation of liquid medicine injection can be realized, which is beneficial to improving the efficiency of liquid medicine injection.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of a pen-type injector.

[0020] Figure 2 for Figure 1 Schematic diagram of the internal structure.

[0021] Figure 3 for Figure 2 The structural front view.

[0022] Figure 4 It is a schematic diagram of the structure of the push-pull control component in the present invention.

[0023] Figure 5 for Figure 4 Schematic diagram of the structure from an upward perspective.

[0024] Figure 6 It is a longitudinal structural cross-sectional view of the push-pull control assembly in the present invention.

[0025] Figure 7 for Figure 6 Schematic diagram of the structure from an upward perspective.

[0026] Figure 8 It is a cross-sectional view of the horizontal structure of the push-pull control assembly in the present invention.

[0027] Figure 9 This is a diagram showing the mating relationship between the inner syringe and the metering assembly in the present invention.

[0028] Figure 10 This is a schematic structural view of the metering assembly in the present invention.

[0029] Figure 11 is Figure 10 front elevational view of the structure.

[0030] In the drawings, the list of components represented by each reference numeral is as follows:

[0031] 1 - inner syringe, 101 - push - pull piston rod, 102 - inner syringe barrel, 103 - automatic replenishing port, 104 - injection needle, 2 - push - pull control assembly, 201 - push - pull control barrel, 202 - automatic replenishing tube, 203 - first connection part, 204 - first elastic member, 205 - central mounting port, 206 - axial regulation cavity, 207 - axial slideway, 208 - radial moving rod, 209 - second elastic member, 210 - clamping part, 211 - axial pushing part, 212 - oblique connecting rod, 213 - axial moving rod, 214 - metering regulation ring, 215 - axial linkage rod, 216 - second connection part, 217 - axial support part, 218 - mounting plate, 219 - U - shaped mounting part, 220 - positioning and guiding part, 221 - clamping control ring, 222 - support ring, 223 - driving rack, 224 - guiding rod, 225 - moving part, 226 - plug - in control gear, 227 - pressing part, 3 - metering assembly, 301 - fixing ring, 302 - first positioning part, 303 - second positioning part, 304 - third positioning part, 305 - fourth positioning part. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] For the first specific embodiment, please refer to Figure 1-11 , the present invention is a pen - type syringe, including an inner syringe 1 and a push - pull control assembly 2. The inner syringe 1 includes a push - pull piston rod 101; the inner syringe 1 is clamped and fixedly installed inside the push - pull control assembly 2, and the push - pull control assembly 2 and the inner syringe 1 are coaxially arranged;

[0034] Among them, the push-pull control component 2 includes a push-pull control cylinder 201, a first connecting portion 203, and a first elastic member 204; the inner syringe 1 is clamped and fixedly installed inside the push-pull control cylinder 201. The circumferential side of the push-pull control cylinder 201 is provided with an automatically replenishing tube 202 that can move radially. The automatically replenishing tube 202 is inserted and matched with the inner syringe 1 and the two are communicated; the first connecting portion 203 is arranged on one side of the push-pull control cylinder 201, and the first connecting portion 203 moves along the axis direction of the push-pull control cylinder 201. The pressing disc fixed to one end of the push-pull piston rod 101 is attached to the first connecting portion 203;

[0035] The first elastic member 204 is fixedly installed outside the push-pull control cylinder 201 and is arranged along the axis direction of the push-pull control cylinder 201. When the first connecting portion 203 is controlled to move towards the direction close to the push-pull control cylinder 201, the first elastic member 204 is compressed by force. After the injection is completed, the first connecting portion 203 is moved reversely to reset by the elastic force of the first elastic member 204. The push-pull piston rod 101 is pushed by the first connecting portion 203 to complete the reset, and the external liquid medicine flows into the inner syringe 1 along the automatically replenishing tube 202 by gravity.

[0036] In this embodiment of the present invention, the end of the push-pull control cylinder 201 close to the first connecting portion 203 is provided with an open structure. The end of the push-pull control cylinder 201 far from the first connecting portion 203 is provided with a central mounting opening 205. The circumferential side of the push-pull control cylinder 201 is provided with an axially regulating cavity 206 coaxial with it. A plurality of axial slideways 207 are arranged in a circumferential array inside the axially regulating cavity 206. Each axial slideway 207 is communicated with the inner cavity of the push-pull control cylinder 201; a radially moving rod 208 corresponding to each axial slideway 207 is slidably arranged on the circumferential side of the push-pull control cylinder 201. A connecting disc fixed to one end of the radially moving rod 208 is connected to the push-pull control cylinder 201 through a second elastic member 209. A clamping portion 210 is fixedly arranged at the other end of the radially moving rod 208. In the initial state, each second elastic member 209 is in a natural state, so that each clamping portion 210 is close to the inner wall of the push-pull control cylinder 201;

[0037] The inner syringe 1 further includes an inner syringe barrel 102, which is coaxially arranged inside the push-pull control barrel 201 and clamped and fixed by respective clamping portions 210. Axial pushing portions 211 corresponding to the clamping portions 210 are slidably arranged axially on the inner wall of the push-pull control barrel 201. The axial pushing portions 211 and the corresponding clamping portions 210 are hingedly engaged through inclined connecting rods 212. Axial moving rods 213 that are slidably engaged in corresponding axial sliding channels 207 are fixedly arranged on the surfaces of the axial pushing portions 211; during the process of controlling the axial movement of the respective axial moving rods 213, the axial moving rods 213 are used to drive the axial pushing portions 211 to move towards the clamping portions 210. During this process, the respective clamping portions 210 are driven by the inclined connecting rods 212 to move towards the center of the push-pull control barrel 201 until the respective clamping portions 210 tightly press against the peripheral side surface of the inner syringe barrel 102, thereby achieving the clamping and fixing of the inner syringe barrel 102. At this time, the respective second elastic members 209 are in a compressed state.

[0038] In this embodiment of the present invention, a quantitative regulation ring 214 coaxial with it is rotatably arranged at the end of the push-pull control barrel 201 close to the first connection portion 203. An axial linkage rod 215 extending into the interior of the push-pull control barrel 201 is slidably arranged on the quantitative regulation ring 214. The first connection portion 203 is fixedly installed on the peripheral side surface of the axial linkage rod 215. A second connection portion 216 is fixedly arranged at one end of the axial linkage rod 215. An axial support portion 217 is fixedly arranged on the side of the quantitative regulation ring 214 away from the first connection portion 203. A mounting plate 218 is fixedly arranged at the end of the axial support portion 217. The first elastic member 204 is connected between the mounting plate 218 and the second connection portion 216. In the initial state, the first elastic member 204 is in a natural state, the first connection portion 203 is in a position away from the push-pull control barrel 201, and the pressing portion 227 fixed at the end of the axial linkage rod 215 abuts against the quantitative regulation ring 214. After clamping and fixing the inner syringe barrel 102 inside the push-pull control barrel 201, the injection needle 104 is clamped at the liquid suction end of the inner syringe barrel 102 at the position of the central mounting opening 205, thereby completing the installation of the entire inner syringe 1 on the push-pull control barrel 201. At this time, the pressing disc at the end of the push-pull piston rod 101 just fits on the first connection portion 203 (i.e., the push-pull piston rod 101 is in the state of being pulled out and waiting to suck the liquid medicine).

[0039] In this embodiment of the present invention, a U-shaped mounting portion 219 is fixedly installed on the peripheral side surface of the push-pull control cylinder 201. A positioning and guiding portion 220 is fixedly arranged on the surface of the U-shaped mounting portion 219. A clamping control ring 221 that is in threaded cooperation with and abuts against each axial moving rod 213 is arranged inside the axial adjustment cavity 206. A support ring 222 is rotatably arranged on the side of the clamping control ring 221 away from the axial moving rod 213. A driving rotation rack 223 that is slidably engaged with the positioning and guiding portion 220 is connected to the surface of the support ring 222 through a support rod. When the clamping control ring 221 is rotated, the axial movement of the driving rotation rack 223 can be controlled, and during this process, the rotation of the support ring 222 will not be caused. During the process of the clamping control ring 221 rotating and axially moving, each axial moving rod 213 always closely abuts against the clamping control ring 221.

[0040] In this embodiment of the present invention, the automatic liquid replenishing tube 202 is slidably installed on the U-shaped mounting portion 219 and penetrates into the push-pull control cylinder 201. An automatic liquid replenishing port 103 that is inserted and matched with the automatic liquid replenishing tube 202 is arranged on the peripheral side surface of the inner injection cylinder 102. A guiding rod 224 is fixedly arranged on the surface of the U-shaped mounting portion 219. A moving portion 225 that is slidably sleeved on the guiding rod 224 is fixedly installed on the peripheral side surface of the automatic liquid replenishing tube 202. A plugging control gear 226 that is meshed with the driving rotation rack 223 is rotatably arranged on the surface of the U-shaped mounting portion 219. The plugging control gear 226 is sleeved on the automatic liquid replenishing tube 202 and the two are in threaded cooperation; after the inner injection cylinder 102 is placed inside the push-pull control cylinder 201 and is clamped with the injection needle 104, by rotating the clamping control ring 221 to move it in the direction close to the injection needle 104, during this process, the clamping control ring 221 is used to push each axial moving rod 213 to move simultaneously, so that each second elastic member 209 is gradually compressed until each clamping portion 210 tightly presses against the peripheral side surface of the inner injection cylinder 102. At the same time, the driving rotation rack 223 that moves synchronously with the clamping control ring 221 drives the plugging control gear 226 to rotate. Under the threaded cooperation between the plugging control gear 226 and the automatic liquid replenishing tube 202, the automatic liquid replenishing tube 202 undergoes radial movement and is inserted into the automatic liquid replenishing port 103 on the inner injection cylinder 102, thereby completing the preparatory work before liquid medicine suction.

[0041] Subsequently, a medicine storage box is placed on the suspension bracket, and an infusion hose is connected to the outlet at the bottom of the medicine storage box. One end of the infusion hose is connected to the automatic replenishing tube 202 (a control valve is installed at the position where the infusion hose is close to the automatic replenishing tube 202). After opening the control valve, the liquid medicine in the medicine storage box flows by gravity along the infusion hose and the automatic replenishing tube 202 into the inner syringe barrel 102. After a certain amount of liquid medicine is delivered into the inner syringe barrel 102, the control valve is closed. By pressing the pressure plate at the end of the push-pull piston rod 101, the first connecting portion 203 moves synchronously, causing the first elastic member 204 to be gradually compressed until the first connecting portion 203 presses against the quantitative regulation ring 214. At this time, the injection piston on the push-pull piston rod 101 discharges all the liquid medicine in the inner syringe barrel 102 to complete the injection;

[0042] After completing one injection of the liquid medicine, gradually release the pressing on the pressure plate at the end of the push-pull piston rod 101. Under the elastic restoring force of the first elastic member 204, the first connecting portion 203 moves reversely to reset. During this process, the pressure plate at the end of the push-pull piston rod 101 is pushed by the first connecting portion 203, causing the push-pull piston rod 101 to be pulled outwards of the inner syringe barrel 102 to achieve the reset of the push-pull piston rod 101. At this time, the injection piston on the push-pull piston rod 101 moves to the left side of the automatic replenishing port 103 (as shown in Figure 2 and Figure 3 ). Subsequently, open the control valve again to deliver a certain amount of liquid medicine into the inner syringe barrel 102, then close the control valve and press the pressure plate at the end of the push-pull piston rod 101 again to make the first connecting portion 203 move synchronously, causing the first elastic member 204 to be gradually compressed until the first connecting portion 203 presses against the quantitative regulation ring 214. At this time, the injection piston on the push-pull piston rod 101 discharges all the liquid medicine in the inner syringe barrel 102 to complete the injection. After the injection is completed, release the push-pull piston rod 101 to complete its reset. In this way, the continuous operation of liquid medicine injection can be realized, which is beneficial to improving the efficiency of liquid medicine injection.

[0043] Specific Embodiment 2: On the basis of Specific Embodiment 1, the present invention further includes a quantitative component 3. The quantitative component 3 is fixedly installed inside the push-pull control cylinder 201 and sleeved outside the inner syringe barrel 102. Among them, the quantitative component 3 includes a fixed ring 301 fixedly installed inside the push-pull control cylinder 201. The surface of the fixed ring 301 is fixedly connected with a first positioning portion 302, a second positioning portion 303, a third positioning portion 304, and a fourth positioning portion 305 through support rods respectively. The first positioning portion 302, the second positioning portion 303, the third positioning portion 304, and the fourth positioning portion 305 are all arranged in an arc structure;

[0044] The first positioning part 302, the second positioning part 303, the third positioning part 304 and the fourth positioning part 305 are respectively arranged at different quadrant points. The axial distances between the first positioning part 302 and the second positioning part 303, between the second positioning part 303 and the third positioning part 304, and between the third positioning part 304 and the fourth positioning part 305 are the same. After opening the control valve to deliver a certain amount of liquid medicine into the inner syringe barrel 102, the pressing control method in the first specific embodiment is adopted to make the axial linkage rod 215 slide inwardly towards the push-pull control cylinder 201 until the pressing part 227 at the end of the axial linkage rod 215 abuts against the first positioning part 302. At this time, a certain amount of liquid medicine in the inner syringe barrel 102 can be discharged to complete the injection. After the liquid medicine injection is completed, the push-pull piston rod 101 is released to make the injection piston return to the initial position. At this time, the pressing part 227 at the end of the axial linkage rod 215 abuts against the quantitative regulation ring 214 again. After opening the control valve again to supplement the liquid medicine in the inner syringe barrel 102, the same injection method can be adopted to continue the liquid medicine injection, and thus continuous injection can be achieved.

[0045] When it is necessary to change the injection amount of the liquid medicine, the quantitative regulation ring 214 is rotated to align the pressing part 227 with the corresponding position of the second positioning part 303. After opening the control valve to deliver a certain amount of liquid medicine into the inner syringe barrel 102, the pressing control method in the first specific embodiment is adopted to make the axial linkage rod 215 slide inwardly towards the push-pull control cylinder 201 until the pressing part 227 at the end of the axial linkage rod 215 abuts against the first positioning part 302. At this time, a certain amount of liquid medicine in the inner syringe barrel 102 can be discharged to complete the injection. After the liquid medicine injection is completed, the push-pull piston rod 101 is released to make the injection piston return to the initial position. At this time, the pressing part 227 at the end of the axial linkage rod 215 abuts against the quantitative regulation ring 214 again. After opening the control valve again to supplement the liquid medicine in the inner syringe barrel 102, the same injection method can be adopted to continue the liquid medicine injection, and thus continuous injection can be achieved. The pressing part 227 can be adjusted to the positions of the third positioning part 304 and the fourth positioning part 305 in the same adjustment method, and thus quantitative injection of different doses of liquid medicine can be achieved.

[0046] Specific embodiment three: On the basis of the second specific embodiment, the quantitative regulation ring 214 is rotated to align the pressing part 227 with the corresponding position of the fourth positioning part 305. At this time, the pressing part 227 at the end of the axial linkage rod 215 abuts against the quantitative regulation ring 214. After opening the control valve to deliver a certain amount of liquid medicine into the inner syringe barrel 102, the push-pull piston rod 101 is pressed to make the axial linkage rod 215 slide inwardly towards the push-pull control cylinder 201 until the pressing part 227 at the end of the axial linkage rod 215 abuts against the fourth positioning part 305. At this time, a certain amount of liquid medicine in the inner syringe barrel 102 can be discharged to complete the injection.

[0047] Next, continue to rotate the metering control ring 214 so that the pressing portion 227 is aligned with the corresponding position on the third positioning portion 304. At this time, the pressing portion 227 at the end of the axial linkage rod 215 abuts against the metering control ring 214. By pressing the push-pull piston rod 101, the axial linkage rod 215 slides inwardly into the push-pull control cylinder 201 until the pressing portion 227 at the end of the axial linkage rod 215 abuts against the third positioning portion 304. At this time, the same dose of liquid medicine in the inner syringe 102 can be discharged to complete the injection;

[0048] Subsequently, rotate the metering control ring 214 again so that the pressing portion 227 is aligned with the corresponding position on the second positioning portion 303. At this time, the pressing portion 227 at the end of the axial linkage rod 215 abuts against the metering control ring 214. By pressing the push-pull piston rod 101, the axial linkage rod 215 slides inwardly into the push-pull control cylinder 201 until the pressing portion 227 at the end of the axial linkage rod 215 abuts against the second positioning portion 303. At this time, the same dose of liquid medicine in the inner syringe 102 can be discharged to complete the injection;

[0049] Finally, rotate the metering control ring 214 again so that the pressing portion 227 is aligned with the corresponding position on the first positioning portion 302. At this time, the pressing portion 227 at the end of the axial linkage rod 215 abuts against the metering control ring 214. By pressing the push-pull piston rod 101, the axial linkage rod 215 slides inwardly into the push-pull control cylinder 201 until the pressing portion 227 at the end of the axial linkage rod 215 abuts against the first positioning portion 302. At this time, the same dose of liquid medicine in the inner syringe 102 can be discharged to complete the injection. Thus, all of the liquid medicine delivered to the inner syringe 102 can be discharged for injection. After all of the liquid medicine in the inner syringe 102 has been injected, rotate the metering control ring 214 so that the pressing portion 227 is realigned with the corresponding position on the fourth positioning portion 305. At this time, open the control valve again to deliver a certain amount of liquid medicine into the inner syringe 102, and the same injection control method described above can be used to continue to achieve liquid medicine injection.

[0050] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A pen-type syringe, comprising an inner syringe (1), and the inner syringe (1) includes a push-pull piston rod (101); characterized in that, It further includes a push-pull control component (2), the inner syringe (1) is clamped and fixedly installed inside the push-pull control component (2), and the push-pull control component (2) is coaxially arranged with the inner syringe (1); Wherein, the push-pull control component (2) includes: A push-pull control cylinder (201), the inner syringe (1) is clamped and fixedly installed inside the push-pull control cylinder (201), an automatically replenishing liquid tube (202) that can move radially is arranged on the circumferential side of the push-pull control cylinder (201), the automatically replenishing liquid tube (202) is inserted and matched with the inner syringe (1) and the two are communicated; A first connecting part (203), the first connecting part (203) is arranged on one side of the push-pull control cylinder (201), and the first connecting part (203) moves along the axis direction of the push-pull control cylinder (201), and the pressing disc fixed at one end of the push-pull piston rod (101) is attached to the first connecting part (203); And a first elastic member (204), the first elastic member (204) is fixedly installed outside the push-pull control cylinder (201), and the first elastic member (204) is arranged along the axis direction of the push-pull control cylinder (201). When the first connecting part (203) is controlled to move towards the direction close to the push-pull control cylinder (201), the first elastic member (204) is compressed by force. After the injection is completed, the first connecting part (203) moves reversely and resets by the elastic force of the first elastic member (204). The push-pull piston rod (101) is pushed by the first connecting part (203) to complete the reset, and the external liquid medicine flows into the inner syringe (1) along the automatically replenishing liquid tube (202); The end of the push-pull control cylinder (201) close to the first connecting part (203) is arranged as an open structure, a central installation port (205) is opened at the end of the push-pull control cylinder (201) far from the first connecting part (203), an axial adjustment cavity (206) coaxial with it is opened on the circumferential side of the push-pull control cylinder (201), and a plurality of axial slideways (207) are arranged in a circumferential array inside the axial adjustment cavity (206), and each of the axial slideways (207) is communicated with the inner cavity of the push-pull control cylinder (201); Radial moving rods (208) corresponding to the axial slideways (207) one by one are slidably arranged on the circumferential side of the push-pull control cylinder (201), a connecting disc fixed at one end of the radial moving rod (208) is connected with the push-pull control cylinder (201) through a second elastic member (209), and a clamping part (210) is fixedly arranged at the other end of the radial moving rod (208); The inner syringe (1) further includes an inner syringe barrel (102), which is coaxially arranged inside the push-pull control barrel (201) and clamped and fixed by respective clamping portions (210). Axial pushing portions (211) corresponding to the clamping portions (210) are slidably arranged on the inner wall of the push-pull control barrel (201) in the axial direction. The axial pushing portions (211) and the corresponding clamping portions (210) are hinged and matched through inclined connecting rods (212). An axial moving rod (213) that is slidably fitted in the corresponding axial slideway (207) is fixedly arranged on the surface of the axial pushing portion (211). A U-shaped mounting portion (219) is fixedly installed on the circumferential surface of the push-pull control barrel (201). A positioning and guiding portion (220) is fixedly arranged on the surface of the U-shaped mounting portion (219). A clamping control ring (221) that is in threaded fit with and abuts against each axial moving rod (213) is arranged inside the axial control cavity (206). A support ring (222) is rotatably arranged on the side of the clamping control ring (221) away from the axial moving rod (213). A driving and rotating rack (223) that is slidably fitted with the positioning and guiding portion (220) is connected to the surface of the support ring (222) through a support rod. The automatic liquid supply pipe (202) is slidably installed on the U-shaped mounting portion (219) and penetrates into the push-pull control barrel (201). An automatic liquid supply port (103) that is inserted and fitted with the automatic liquid supply pipe (202) is formed on the circumferential surface of the inner syringe barrel (102). A plugging control gear (226) that meshes with the driving and rotating rack (223) is rotatably arranged on the surface of the U-shaped mounting portion (219). The plugging control gear (226) is sleeved on the automatic liquid supply pipe (202) and the two are in threaded fit. It further includes a metering assembly (3), which is fixedly installed inside the push-pull control barrel (201) and sleeved outside the inner syringe barrel (102). Among them, the metering assembly (3) includes a fixed ring (301) fixedly installed inside the push-pull control barrel (201). A first positioning portion (302), a second positioning portion (303), a third positioning portion (304), and a fourth positioning portion (305) are respectively and fixedly connected to the surface of the fixed ring (301) through support rods. The first positioning portion (302), the second positioning portion (303), the third positioning portion (304), and the fourth positioning portion (305) are all arranged in an arc structure. The first positioning portion (302), the second positioning portion (303), the third positioning portion (304), and the fourth positioning portion (305) are respectively arranged at different quadrant points. The axial distances between the first positioning portion (302) and the second positioning portion (303), between the second positioning portion (303) and the third positioning portion (304), and between the third positioning portion (304) and the fourth positioning portion (305) are the same.

2. The pen-type syringe according to claim 1, characterized in that, A quantitative regulation ring (214) coaxial with the push-pull control cylinder (201) is rotatably arranged at the end of the push-pull control cylinder (201) close to the first connection part (203). An axial linkage rod (215) extending into the interior of the push-pull control cylinder (201) is slidably arranged on the quantitative regulation ring (214). The first connection part (203) is fixedly installed on the peripheral side surface of the axial linkage rod (215). A second connection part (216) is fixedly arranged at one end of the axial linkage rod (215). An axial support part (217) is fixedly arranged on the side of the quantitative regulation ring (214) away from the first connection part (203). A mounting plate (218) is fixedly arranged at the end of the axial support part (217). The first elastic part (204) is connected between the mounting plate (218) and the second connection part (216).

3. A pen-type syringe according to claim 2, characterized in that, A guide rod (224) is fixedly arranged on the surface of the U-shaped mounting part (219). A moving part (225) which is slidably sleeved on the guide rod (224) is fixedly installed on the peripheral side surface of the automatic liquid replenishing pipe (202).

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