Pen type injector

Abstract

The invention discloses a pen type injector, and relates to the technical field of injectors. An inner syringe is clamped and fixedly installed in a push-pull control assembly and a push-pull control cylinder, an automatic liquid supplementing pipe capable of moving in the radial direction is arranged on the circumferential side face of the push-pull control cylinder, a first connecting part is arranged on one side of the push-pull control cylinder, and the first connecting part moves in the axis direction of the push-pull control cylinder; a pressing disc fixed to one end of the push-pull piston rod is attached to the first connecting part, and the first elastic piece is fixedly installed on the outer side of the push-pull control cylinder and arranged in the axis direction of the push-pull control cylinder. The positioning parts are arranged on the different quadrant points respectively, the axial distance between the first positioning part and the second positioning part, the axial distance between the second positioning part and the third positioning part and the axial distance between the third positioning part and the fourth positioning part are the same, and when the push-pull piston rod is pressed, liquid medicine of the same dosage can be discharged to complete injection.

Description

Technical Field

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

[0002] A syringe consists of a syringe with a small hole at the front end and a matching piston core rod. It is used to inject a small amount of liquid into or extract from areas that are inaccessible by other methods. When the core rod is pulled out, the liquid or gas is sucked from the small hole at the front end of the syringe, and when the core rod is pushed in, the liquid or gas is squeezed out. Pen syringes are one of the commonly used syringes, and are named because of their appearance similar to a pen.

[0003] In the prior art, after the general pen-type injector draws the liquid medicine, most of them directly observe the scale line to achieve the purpose of quantitative injection. During the quantitative injection process, it is easy to cause deviation in the injection of the liquid medicine due to naked eye observation. At the same time, the existing pen-type injector needs to draw the liquid medicine again after completing one injection, which cannot achieve the purpose of continuous liquid medicine injection. To this end, we provide a pen-type injector to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a pen-type injector, which solves the above-mentioned problems in the background technology through the specific structural design of the automatic liquid filling port, the push-pull control component and the quantitative component.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a pen-type syringe, comprising an inner syringe and a push-pull control assembly, wherein the inner syringe comprises a push-pull piston rod; the inner syringe is clamped and fixedly installed inside the push-pull control assembly, and the push-pull control assembly and the inner syringe are arranged coaxially; wherein the push-pull control assembly comprises a push-pull control cylinder, the inner syringe is clamped and fixedly installed inside the push-pull control cylinder, a radially movable automatic liquid filling tube is arranged on the peripheral side of the push-pull control cylinder, the automatic liquid filling tube is plug-fitted with the inner syringe and the two are arranged in communication; a first connecting part, the first connecting part is arranged on one side of the push-pull control cylinder side, and the first connecting part moves along the axial direction of the push-pull control cylinder, and the pressure plate fixed at one end of the push-pull piston rod is attached to the first connecting part; and a first elastic member, the first elastic member is fixedly installed on the outside of the push-pull control cylinder, and the first elastic member is arranged along the axial direction of the push-pull control cylinder. When the first connecting part is controlled to move in the direction close to the push-pull control cylinder, the first elastic member is compressed by force. After the injection is completed, the first connecting part is moved in the opposite direction and reset with the help of the elastic force of the first elastic member. The reset is completed by pushing the push-pull piston rod through the first connecting part, and the external medicine flows into the inner syringe along the automatic refilling tube.

[0006] The present invention is further configured such that the end of the push-pull control tube close to the first connection part is configured as an open structure, the end of the push-pull control tube away from the first connection part is provided with a central installation opening, the peripheral side of the push-pull control tube is provided with an axial control cavity coaxial with the tube, a plurality of axial slideways are provided in an annular array inside the axial control cavity, and each of the axial slideways is communicated with the inner cavity of the push-pull control tube.

[0007] The present invention is further configured as follows: a radial moving rod corresponding to the axial slideway is slidably provided on the peripheral side surface of the push-pull control cylinder, a connecting disk fixed at one end of the radial moving rod is connected to the push-pull control cylinder by a second elastic member, and a clamping portion is fixedly provided on the other end of the radial moving rod; the inner syringe also includes an inner syringe, which is coaxially arranged on the inner side of the push-pull control cylinder and is clamped and fixed by various clamping portions, an axial pushing portion corresponding to the clamping portion is axially slidably provided on the inner wall of the push-pull control cylinder, the axial pushing portion is hingedly matched with the corresponding clamping portion by an oblique connecting rod, and an axial moving rod slidably matched in the corresponding axial slideway is fixedly provided on the surface of the axial pushing portion.

[0008] The present invention is further configured such that a quantitative control ring coaxial with the push-pull control cylinder is rotatably provided at the end portion of the push-pull control cylinder close to the first connection portion, an axial linkage rod extending to the interior of the push-pull control cylinder is slidably provided on the quantitative control ring, the first connection portion is fixedly mounted on the circumferential side surface of the axial linkage rod, a second connection portion is fixedly provided at one end of the axial linkage rod, an axial support portion is fixedly provided on the side of the quantitative control ring away from the first connection portion, a mounting plate is fixedly provided on the end portion of the axial support portion, and the first elastic member is connected between the mounting plate and the second connection portion.

[0009] The present invention is further configured such that a U-shaped mounting portion is fixedly mounted on the peripheral side surface of the push-pull control cylinder, a positioning guide portion is fixedly mounted on the surface of the U-shaped mounting portion, the internal thread of the axial regulating cavity is equipped with a clamping control ring that fits with each axial moving rod, a support ring is rotatably arranged on the side of the clamping control ring away from the axial moving rod, and a driving rack that slides with the positioning guide portion is connected to the surface of the support ring through a support rod.

[0010] The present invention is further configured as follows: the automatic fluid replenishing tube is slidably mounted on the U-shaped mounting portion and passes through the interior of the push-pull control cylinder; an automatic fluid replenishing port which is plugged into and matched with the automatic fluid replenishing tube is opened on the circumferential side surface of the inner injection cylinder; a guide rod is fixedly mounted on the surface of the U-shaped mounting portion; a moving portion which is slidably mounted on the guide rod is fixedly mounted on the circumferential side surface of the automatic fluid replenishing tube; a plug-in control gear which is rotatably mounted on the surface of the U-shaped mounting portion and which meshes with a driving rack; the plug-in control gear is sleeved on the automatic fluid replenishing tube and the two are threadably matched.

[0011] The present invention is further configured as follows: the present invention also includes a quantitative component, which is fixedly installed inside the push-pull control cylinder, and the quantitative component is sleeved on the outside of the inner injection cylinder; wherein the quantitative component includes a fixed ring fixedly installed inside the push-pull control cylinder, and the surface of the fixed ring is fixedly connected with a first positioning portion, a second positioning portion, a third positioning portion and a fourth positioning portion 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 spacing between the first positioning portion and the second positioning portion, the axial spacing between the second positioning portion and the third positioning portion, and the axial spacing between the third positioning portion and the fourth positioning portion are the same.

[0012] The present invention has the following beneficial effects: The present invention arranges 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 spacing between the first positioning portion and the second positioning portion, the axial spacing between the second positioning portion and the third positioning portion, and the axial spacing between the third positioning portion and the fourth positioning portion are the same. When the piston rod is pressed and pushed, the same dose of liquid medicine can be discharged to complete the injection, and there is no need to re-absorb after completing a single injection before continuing the injection, thereby greatly improving the efficiency of liquid medicine injection.

[0013] When the injection volume of the medicine liquid needs to be changed, the quantitative control ring is rotated to align the pressing portion with the corresponding position of the second positioning portion. After the control valve is opened to transport a certain amount of medicine liquid into the inner syringe, the axial linkage rod is controlled to slide toward 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 medicine liquid in the inner syringe can be discharged to complete the injection. After the injection of the medicine liquid is completed, the push-pull piston rod is released to return the injection piston to the initial position. At this time, the pressing portion at the end of the axial linkage rod abuts against the quantitative control ring again. After the control valve is opened again to replenish the medicine liquid in the inner syringe, the same injection method can be used to continue to inject the medicine liquid, thereby realizing continuous injection. The pressing portion can be adjusted to the positions of the third positioning portion and the fourth positioning portion in the same adjustment method, thereby realizing quantitative injection of different doses of medicine liquid.

[0014] 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.

[0015] 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

[0016] 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.

[0017] Figure 1 It is a schematic diagram of the structure of a pen-type injector.

[0018] Figure 2 for Figure 1 Schematic diagram of the internal structure.

[0019] Figure 3 for Figure 2 The structural front view.

[0020] Figure 4 It is a schematic diagram of the structure of the push-pull control component in the present invention.

[0021] Figure 5 for Figure 4 Schematic diagram of the structure from an upward perspective.

[0022] Figure 6 It is a longitudinal structural cross-sectional view of the push-pull control assembly in the present invention.

[0023] Figure 7 for Figure 6 Schematic diagram of the structure from an upward perspective.

[0024] Figure 8 It is a cross-sectional view of the horizontal structure of the push-pull control assembly in the present invention.

[0025] Fig. 9 It is a diagram showing the matching relationship between the inner syringe and the quantitative component in the present invention.

[0026] Fig.10 It is a schematic diagram of the structure of the quantitative component in the present invention.

[0027] Fig.11 for Fig.10 The structural front view.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1-inner syringe, 101-push-pull piston rod, 102-inner syringe, 103-automatic refill port, 104-injection needle, 2-push-pull control assembly, 201-push-pull control cylinder, 202-automatic refill tube, 203-first connecting part, 204-first elastic member, 205-center installation port, 206-axial regulating 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-axial moving rod, 215-axial moving rod, 216-axial moving rod, 217-axial moving rod, 218-axial moving rod, 219-axial moving rod, 220-axial moving rod, 221-axial moving rod, 222-axial moving rod, 223-axial moving rod, 224-axial moving rod, 225-axial moving rod, 226-axial moving rod, 227-axial moving rod, 228-axial moving rod, 229-axial moving rod, 230-axial moving rod, 231-axial moving rod, 232-axial moving rod, 233-axial moving rod, 234-axial moving rod, 235-axial moving rod, 236-axial moving rod, 237-axial moving rod, 238-axial moving rod, 239-axial moving rod, 240-axial moving rod, 241-axial moving rod, 242-axial moving rod, 243-axial moving rod, 244-axial moving rod, 245-axial moving rod, 246-axial moving rod, 247-axial moving rod, 248-axial moving rod, 249-axial moving rod, 4-quantitative control ring, 215-axial linkage rod, 216-second connecting part, 217-axial support part, 218-mounting plate, 219-U-shaped mounting part, 220-positioning guide part, 221-clamping control ring, 222-support ring, 223-driving rack, 224-guide rod, 225-moving part, 226-plug-in control gear, 227-pressing part, 3-quantitative assembly, 301-fixed ring, 302-first positioning part, 303-second positioning part, 304-third positioning part, 305-fourth positioning part. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] For specific embodiment 1, please refer to Figure 1-11 The present invention is a pen-type syringe, comprising an inner syringe 1 and a push-pull control assembly 2, wherein the inner syringe 1 comprises 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 is coaxially arranged with the inner syringe 1; The push-pull control assembly 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, and a radially movable automatic liquid replenishing tube 202 is arranged on the peripheral side of the push-pull control cylinder 201, and the automatic liquid replenishing tube 202 is plugged and matched with the inner syringe 1 and the two are connected; 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 axial direction of the push-pull control cylinder 201, and the pressure plate fixed at one end of the push-pull piston rod 101 is attached to the first connecting portion 203; The first elastic member 204 is fixedly mounted on the outside of the push-pull control cylinder 201, and the first elastic member 204 is arranged along the axial direction of the push-pull control cylinder 201. When the first connecting part 203 is controlled to move toward the direction close to the push-pull control cylinder 201, the first elastic member 204 is compressed. After the injection is completed, the first connecting part 203 is moved in the opposite direction and reset with the help of the elastic force of the first elastic member 204. The first connecting part 203 pushes the push-pull piston rod 101 to complete the reset, and the external medicine flows along the automatic refilling tube 202 into the inner syringe 1.

[0031] In this embodiment of the present invention, the end of the push-pull control cylinder 201 close to the first connection part 203 is set to an open structure, and the end of the push-pull control cylinder 201 away from the first connection part 203 is provided with a central installation opening 205, and the circumferential side of the push-pull control cylinder 201 is provided with an axial control cavity 206 coaxial with the axial control cavity 206, and a plurality of axial slideways 207 are arranged in a circumferential array inside the axial control cavity 206, and each axial slideway 207 is connected to the inner cavity of the push-pull control cylinder 201; the circumferential side of the push-pull control cylinder 201 is slidably provided with a radial moving rod 208 corresponding to the axial slideway 207 one by one, and the connecting disk fixed at one end of the radial moving rod 208 is connected to the push-pull control cylinder 201 through a second elastic member 209, and the other end of the radial moving rod 208 is fixedly provided with a clamping portion 210, and each second elastic member 209 is in a natural state in the initial state, so that each clamping portion 210 is close to the inner wall of the push-pull control cylinder 201; The inner syringe 1 also includes an inner syringe 102, which is coaxially arranged inside the push-pull control cylinder 201 and is clamped and fixed by various clamping parts 210. The inner wall of the push-pull control cylinder 201 is axially slidably provided with an axial push part 211 corresponding to the clamping part 210 one by one. The axial push part 211 is hingedly matched with the corresponding clamping part 210 through an oblique connecting rod 212. The surface of the axial push part 211 is fixedly provided with an axial moving rod 213 that is slidably matched in the corresponding axial slideway 207. In the process of controlling the axial movement of each axial moving rod 213, the axial moving rod 213 is used to drive the axial pushing portion 211 to move toward the direction close to the clamping portion 210. In this process, the oblique connecting rod 212 drives each clamping portion 210 to move toward the center of the push-pull control cylinder 201 until each clamping portion 210 is tightly pressed against the side surface of the inner injection cylinder 102, thereby achieving the clamping and fixation of the inner injection cylinder 102. At this time, each second elastic member 209 is in a compressed state.

[0032] In this embodiment of the present invention, a quantitative control ring 214 coaxial with the push-pull control cylinder 201 is rotatably provided at the end thereof close to the first connection portion 203, an axial linkage rod 215 extending to the inside of the push-pull control cylinder 201 is slidably provided on the quantitative control ring 214, the first connection portion 203 is fixedly mounted on the peripheral side of the axial linkage rod 215, a second connection portion 216 is fixedly provided at one end of the axial linkage rod 215, an axial support portion 217 is fixedly provided on the side of the quantitative control ring 214 away from the first connection portion 203, a mounting plate 218 is fixedly provided at the end of the axial support portion 217, and the first elastic member 204 is connected to 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 connecting portion 203 is in a position away from the push-pull control cylinder 201, and the pressing portion 227 fixed at the end of the axial linkage rod 215 is against the quantitative control ring 214. After the inner syringe 102 is clamped and fixed inside the push-pull control cylinder 201, the injection needle 104 is clamped on the liquid aspiration end of the inner syringe 102 at the position of the central mounting port 205, thereby completing the installation of the entire inner syringe 1 on the push-pull control cylinder 201. At this time, the pressure plate at the end of the push-pull piston rod 101 just fits on the first connecting portion 203 (that is, the push-pull piston rod 101 is in the state of being pulled out to absorb the liquid).

[0033] In this embodiment of the present invention, a U-shaped mounting portion 219 is fixedly installed on the side surface of the push-pull control cylinder 201, a positioning guide portion 220 is fixedly provided on the surface of the U-shaped mounting portion 219, and the internal thread of the axial regulating cavity 206 is equipped with a clamping control ring 221 that fits with each axial moving rod 213, and a support ring 222 is rotatably provided on the side of the clamping control ring 221 away from the axial moving rod 213, and a driving rack 223 that slides with the positioning guide portion 220 is connected to the surface of the support ring 222 through a support rod, and the axial movement of the driving rack 223 can be controlled when the clamping control ring 221 is rotated, and the support ring 222 will not be caused to rotate in this process. In the process of the clamping control ring 221 rotating and moving axially, each axial moving rod 213 is always tightly attached to the clamping control ring 221.

[0034] In this embodiment of the present invention, the automatic refilling tube 202 is slidably mounted on the U-shaped mounting portion 219 and penetrates into the push-pull control cylinder 201. An automatic refilling port 103 that is plugged into the automatic refilling tube 202 is provided on the side surface of the inner syringe 102. A guide 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 guide rod 224 is fixedly installed on the side surface of the automatic refilling tube 202. A plug-in control gear 226 that meshes with the driving rack 223 is rotatably arranged on the surface of the U-shaped mounting portion 219. The plug-in control gear 226 is sleeved on the automatic refilling tube 202 and the two are threadedly matched. When the inner syringe 102 is placed into the push-pull control cylinder 201 and is connected to the injection needle 1 04 is clamped, the clamping control ring 221 is rotated to move it in the direction close to the injection needle 104. In this process, the clamping control ring 221 is used to push the axial moving rods 213 to move simultaneously, so that the second elastic members 209 are gradually compressed until the clamping parts 210 are tightly pressed against the side surfaces of the inner syringe 102. At the same time, the driving rack 223 that moves synchronously with the clamping control ring 221 drives the plug-in control gear 226 to rotate. Under the cooperation of the plug-in control gear 226 and the thread of the automatic liquid filling tube 202, the automatic liquid filling tube 202 moves radially and is inserted into the automatic liquid filling port 103 on the inner syringe 102, thereby completing the preparation work before the liquid is absorbed.

[0035] Subsequently, a medicine storage box is placed on the hanging rack, and an infusion hose is connected to the outlet at the bottom of the medicine storage box, and one end of the infusion hose is connected to the automatic liquid replenishing tube 202 (a control valve is installed at the position of the infusion hose close to the automatic liquid replenishing tube 202). After opening the control valve, the medicine liquid in the medicine storage box flows along the infusion hose and the automatic liquid replenishing tube 202 to the inner syringe 102. After a certain amount of medicine liquid is delivered to the inner syringe 102, the control valve is closed, and the first connecting part 203 is synchronously moved by pressing the pressure plate at the end of the push-pull piston rod 101, so that the first elastic member 204 is gradually compressed until the first connecting part 203 is pressed against the quantitative control ring 214. At this time, the injection piston on the push-pull piston rod 101 discharges all the medicine liquid in the inner syringe 102 to complete the injection; After completing a drug injection, gradually release the pressure 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 in the opposite direction to reset. In this process, the first connecting portion 203 pushes the pressure plate at the end of the push-pull piston rod 101, so that the push-pull piston rod 101 is pulled outward from the inner injection cylinder 102 to reset 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 liquid replenishment port 103 (such as Figure 2 and Figure 3 As shown), the control valve is then opened again to deliver a certain amount of liquid medicine into the inner syringe 102, and then the control valve is closed and the pressure plate at the end of the push-pull piston rod 101 is pressed again to make the first connecting part 203 move synchronously, so that the first elastic member 204 is gradually compressed until the first connecting part 203 is pressed against the quantitative control ring 214. At this time, the injection piston on the push-pull piston rod 101 discharges all the liquid medicine in the inner syringe 102 to complete the injection. After the injection is completed, the push-pull piston rod 101 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.

[0036] Specific embodiment 2, on the basis of specific embodiment 1, the present invention further comprises a quantitative component 3, the quantitative component 3 is fixedly mounted inside the push-pull control cylinder 201, and the quantitative component 3 is sleeved on the outside of the inner injection cylinder 102; wherein the quantitative component 3 comprises a fixed ring 301 fixedly mounted inside the push-pull control cylinder 201, and the surface of the fixed ring 301 is respectively 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 a support rod, and 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 quadrants, and the axial spacing between the first positioning portion 302 and the second positioning portion 303, the axial spacing between the second positioning portion 303 and the third positioning portion 304, and the axial spacing between the third positioning portion 304 and the fourth positioning portion 305 are the same; after the control valve is opened to deliver a certain amount of liquid medicine into the inner injection cylinder 102, the pressing control method in the specific embodiment 1 is adopted to make the axial linkage rod 215 push and pull the inner side of the control cylinder 201 Slide until the pressing portion 227 at the end of the axial linkage rod 215 abuts against the first positioning portion 302. At this time, a certain amount of liquid medicine in the inner syringe 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 portion 227 at the end of the axial linkage rod 215 abuts against the quantitative control ring 214 again. After the control valve is opened again to replenish the liquid medicine in the inner syringe 102, the same injection method can be used to continue to inject the liquid medicine, thereby achieving continuous injection; When it is necessary to change the injection volume of the liquid medicine, the quantitative control ring 214 is rotated to align the pressing portion 227 with the corresponding position of the second positioning portion 303. After the control valve is opened to deliver a certain amount of liquid medicine into the inner syringe 102, the pressing control method in the specific embodiment 1 is used to make the axial linkage rod 215 slide toward the inner side of 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, a certain amount of liquid medicine in the inner syringe 102 can be discharged to complete the injection. After the injection of the drug solution, the push-pull piston rod 101 is released to allow the injection piston to return to the initial position. At this time, the pressing portion 227 at the end of the axial linkage rod 215 rests against the quantitative control ring 214 again. After the control valve is opened again to replenish the drug solution in the inner syringe 102, the same injection method can be used to continue to inject the drug solution, thereby achieving continuous injection. The pressing portion 227 can be adjusted to the positions of the third positioning portion 304 and the fourth positioning portion 305 in the same adjustment method, thereby achieving quantitative injection of different doses of drug solution.

[0037] Specific embodiment three, on the basis of specific embodiment two, by rotating the quantitative control ring 214, the pressing portion 227 is aligned with the corresponding position of the fourth positioning portion 305, at this time, the pressing portion 227 at the end of the axial linkage rod 215 is pressed against the quantitative control ring 214, after the control valve is opened to deliver a certain amount of liquid medicine into the inner injection cylinder 102, the axial linkage rod 215 is slid toward the inner side of the push-pull control cylinder 201 by pressing the push-pull piston rod 101, until the pressing portion 227 at the end of the axial linkage rod 215 is pressed against the fourth positioning portion 305, at this time, a certain amount of liquid medicine in the inner injection cylinder 102 can be discharged to complete the injection; Next, the quantitative control ring 214 is continuously rotated so that the pressing portion 227 is aligned with the corresponding position of the third positioning portion 304. At this time, the pressing portion 227 at the end of the axial linkage rod 215 abuts against the quantitative control ring 214. By pressing the push-pull piston rod 101, the axial linkage rod 215 slides toward the inside of 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. Subsequently, the quantitative control ring 214 is rotated again so that the pressing portion 227 is aligned with the corresponding position of the second positioning portion 303. At this time, the pressing portion 227 at the end of the axial linkage rod 215 abuts against the quantitative control ring 214. By pressing the push-pull piston rod 101, the axial linkage rod 215 slides toward the inside of 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. Finally, the quantitative control ring 214 is rotated again to align the pressing portion 227 with the corresponding position of the first positioning portion 302. At this time, the pressing portion 227 at the end of the axial linkage rod 215 abuts against the quantitative control ring 214. The axial linkage rod 215 slides toward the inner side of the push-pull control cylinder 201 by pressing the push-pull piston rod 101 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, thereby completely discharging and injecting the liquid medicine delivered to the inner syringe 102. After completing the injection of all the liquid medicine in the inner syringe 102, the quantitative control ring 214 is rotated to realign the pressing portion 227 with the corresponding position of the fourth positioning portion 305. At this time, the control valve is opened again to deliver a certain amount of liquid medicine into the inner syringe 102. The liquid medicine injection can continue to be achieved using the same injection control method as mentioned above.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does 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.

[0039] 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 implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pen-type syringe, comprising an inner syringe (1), wherein the inner syringe (1) comprises a push-pull piston rod (101); characterized in that: It also comprises 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) and the inner syringe (1) are coaxially arranged; Wherein, the push-pull control component (2) comprises: A push-pull control cylinder (201), wherein the inner syringe (1) is clamped and fixedly installed inside the push-pull control cylinder (201), and a radially movable automatic liquid replenishing tube (202) is arranged on the peripheral side of the push-pull control cylinder (201), and the automatic liquid replenishing tube (202) is plugged and matched with the inner syringe (1), and the two are arranged in communication; A first connection part (203), the first connection part (203) is arranged on one side of the push-pull control cylinder (201), and the first connection part (203) moves along the axial direction of the push-pull control cylinder (201), and a pressure plate fixed at one end of the push-pull piston rod (101) is attached to the first connection part (203); and a first elastic member (204), wherein the first elastic member (204) is fixedly mounted on the outside of the push-pull control cylinder (201), and the first elastic member (204) is arranged along the axial direction of the push-pull control cylinder (201); when the first connecting portion (203) is controlled to move in a direction close to the push-pull control cylinder (201), the first elastic member (204) is compressed by force; when the injection is completed, the first connecting portion (203) is moved in the opposite direction and reset by virtue of 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 medicine flows along the automatic liquid replenishing tube (202) into the inner syringe (1).

2. A pen-type injector according to claim 1, characterized in that: The end of the push-pull control tube (201) close to the first connection part (203) is arranged as an open structure, and the end of the push-pull control tube (201) away from the first connection part (203) is provided with a central installation opening (205), and the circumferential side of the push-pull control tube (201) is provided with an axial control cavity (206) coaxial with the axial control cavity (201), and a plurality of axial slideways (207) are arranged in a circumferential array inside the axial control cavity (206), and each of the axial slideways (207) is communicated with the inner cavity of the push-pull control tube (201).

3. A pen-type injector according to claim 2, characterized in that: A radial moving rod (208) corresponding to the axial slideway (207) is slidably disposed on the peripheral side of the push-pull control cylinder (201); a connecting disk fixed at one end of the radial moving rod (208) is connected to the push-pull control cylinder (201) via a second elastic member (209); and a clamping portion (210) is fixedly disposed at the other end of the radial moving rod (208); The inner syringe (1) further comprises an inner syringe (102), wherein the inner syringe (102) is coaxially arranged on the inner side of the push-pull control cylinder (201) and is clamped and fixed by various clamping parts (210); an axial push part (211) corresponding to the clamping part (210) is axially slidably arranged on the inner wall of the push-pull control cylinder (201); the axial push part (211) is hingedly matched with the corresponding clamping part (210) via an oblique connecting rod (212); and an axial moving rod (213) slidably matched in the corresponding axial slideway (207) is fixedly arranged on the surface of the axial push part (211).

4. A pen-type injector according to claim 3, characterized in that: The end of the push-pull control cylinder (201) close to the first connection part (203) is rotatably provided with a quantitative control ring (214) coaxial therewith, and an axial linkage rod (215) extending to the inside of the push-pull control cylinder (201) is slidably provided on the quantitative control ring (214), the first connection part (203) is fixedly mounted on the peripheral side of the axial linkage rod (215), a second connection part (216) is fixedly mounted on one end of the axial linkage rod (215), an axial support part (217) is fixedly mounted on the side of the quantitative control ring (214) away from the first connection part (203), a mounting plate (218) is fixedly mounted on the end of the axial support part (217), and the first elastic member (204) is connected between the mounting plate (218) and the second connection part (216).

5. A pen-type injector according to claim 4, characterized in that: A U-shaped mounting portion (219) is fixedly mounted on the side surface of the push-pull control cylinder (201), a positioning guide portion (220) is fixedly mounted on the surface of the U-shaped mounting portion (219), the internal thread of the axial regulating cavity (206) is equipped with a clamping control ring (221) that fits with each axial moving rod (213), a support ring (222) is rotatably mounted on the side of the clamping control ring (221) away from the axial moving rod (213), and a driving rack (223) that slidably fits with the positioning guide portion (220) is connected to the surface of the support ring (222) via a support rod.

6. A pen-type injector according to claim 5, characterized in that: The automatic refilling tube (202) is slidably mounted on the U-shaped mounting portion (219) and penetrates into the push-pull control cylinder (201); an automatic refilling port (103) plugged into and matched with the automatic refilling tube (202) is provided on the peripheral side of the inner injection cylinder (102); a guide rod (224) is fixedly mounted on the surface of the U-shaped mounting portion (219); a moving portion (225) slidably sleeved on the guide rod (224) is fixedly mounted on the peripheral side of the automatic refilling tube (202); a plug-in control gear (226) meshing with the driving rack (223) is rotatably mounted on the surface of the U-shaped mounting portion (219); the plug-in control gear (226) is sleeved on the automatic refilling tube (202) and the two are threadedly matched.

7. A pen-type injector according to claim 6, characterized in that: It also comprises a quantitative component (3), wherein the quantitative component (3) is fixedly mounted inside the push-pull control cylinder (201), and the quantitative component (3) is sleeved on the outside of the inner injection cylinder (102); The quantitative assembly (3) comprises a fixing ring (301) fixedly mounted inside the push-pull control cylinder (201); a first positioning portion (302), a second positioning portion (303), a third positioning portion (304) and a fourth positioning portion (305) are respectively fixedly connected to the surface of the fixing ring (301) via supporting 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-shaped 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, and the axial spacing between the first positioning portion (302) and the second positioning portion (303), the axial spacing between the second positioning portion (303) and the third positioning portion (304), and the axial spacing between the third positioning portion (304) and the fourth positioning portion (305) are the same.

Images