A portable intramuscular injector

Abstract

The present invention relates to the technical field of intramuscular syringes, and in particular to a portable intramuscular syringe, comprising a syringe, a piston handle, a piston, a power unit, a one-way valve of an auxiliary unit and a control unit, wherein the outer sides of the head and tail of the syringe are respectively provided with threads; a piston is slidably mounted inside the syringe; a piston handle is fixedly mounted on the top of the piston; the one-way valve comprises a trapezoidal frustum plug, a hollow cylinder, a cylinder and a spring; the one-way valve is fixedly mounted inside the auxiliary unit; a power unit is fixedly mounted on the head of the syringe; an auxiliary unit is fixedly mounted on the tail of the syringe; a control unit is fixedly mounted inside the power unit; the power unit is electrically connected to the control unit. The present invention not only realizes automatic injection, but also can realize accurate injection of trace amounts of liquid medicine, the injection speed can be adjusted according to the different muscle density of the patient, manual injection can also be used, and at the same time, backdrawing is prevented from causing the liquid medicine in the syringe to be contaminated.

Description

Technical Field

[0001] The invention relates to the technical field of intramuscular injectors, and in particular to a portable intramuscular injector. Background Art

[0002] With the development of medical technology, patients need intramuscular injections during treatment, so intramuscular injections have become one of the common methods of using drugs. The drug is injected into the patient's appropriate muscles through a syringe, and the muscle slowly absorbs the drug to achieve the purpose of treatment. However, during the injection of certain trace amounts of liquid medicine, injection errors may occur due to inconvenient operation and human factors, which may cause discomfort to the patient.

[0003] During the injection process of the syringe, medical staff are required to inject manually. In order to solve the above problems, the prior art discloses some syringes, such as the Chinese invention patent: CN108697848B Publication date: 2021-10-22 discloses an automatic syringe, including a shell, which is arranged to accommodate a syringe with a piston, for sealing the syringe and displacing the drug, the shell having a proximal end and a distal end intended to be applied against the injection site; and a retractable plunger unit, which is arranged between the piston and the proximal end of the shell, the retractable plunger unit comprising a retractable frame and a spring element surrounding the plunger element, wherein The plunger element is fixed to the base of the telescopic plunger unit, and the spring element is maintained in an initial compressed state by the compression force applied by the base of the telescopic plunger unit; when the spring element is released, the tapered profile of the telescopic frame is constructed to provide a friction force that varies with extension, so that as the telescopic plunger unit is extended more, the telescopic extension resistance decreases as the spring force provided by the spring element decreases, and the function of automatic injection is achieved by the spring, but the syringe cannot accurately control the injection dose of certain liquid medicines during the automatic injection process.

[0004] During injection or after use, the syringe may be contaminated by human factors, causing the syringe and the liquid medicine inside the syringe to be contaminated. To address this problem, the prior art discloses a syringe, such as the Chinese invention patent: CN216169226U Publication date: 2022-04-05 Discloses a one-way push-type anti-reuse micro- and quantitative syringe, including an empty barrel, a rubber plug arranged at the top end of a core rod in the empty barrel, an outer sleeve arranged in the opening direction of the empty barrel, and a quantitative push structure arranged in the outer sleeve, the quantitative push structure including a sleeve, a push card and a clamp arranged in the sleeve, and by rotating the hand, the reset spring and the wedge spring lock the push rod, so that the push rod can only be pushed in one direction, ensuring that it will not be reused by others. Although the syringe can achieve one-way movement to ensure that the liquid medicine will not be contaminated, the device can only be used once, which will cause a great waste of medical equipment. If it is not handled properly, it will also cause environmental pollution.

[0005] Based on the change of injection speed during the injection process of the syringe, the prior art has also provided some solutions, such as the Chinese invention patent: CN108404258B Publication date: 2021-04-23 discloses a syringe with a stable injection speed, including a syringe, a needle, a piston and a push rod, the needle is placed at the left end of the syringe, the syringe has an inner cavity, the piston is slidably placed in the inner cavity, the left end of the push rod is connected to the piston, the push rod has a rotatable disc coaxially arranged with the push rod, the disc is placed on the right side of the piston, and the disc has openings radially arranged along the axis of the disc and distributed in a circle There are multiple slide grooves, and there are tension springs and sliders in the slide grooves. The slider slides toward the axial direction of the disc under the tension of the tension spring; a rotatable sleeve coaxially arranged with the push rod is sleeved on the push rod, and the left end of the sleeve is connected to the disc. There is a spirally arranged cam groove on the sleeve, and there is a cam push rod on the syringe. The cam push rod is placed in the cam groove, which realizes effective restriction of the injection speed according to the change of the injection speed. However, the speed restriction of the syringe is a restriction of external force, which only ensures that the drug solution cannot enter the patient's muscles too quickly, and the speed cannot be adjusted according to the different muscle density of the patient.

[0006] In view of this, in order to address the above-mentioned deficiencies, the present invention has improved and optimized the existing syringe and developed a portable intramuscular syringe. Summary of the invention

[0007] Technical problem to be solved by the present invention: Traditional intramuscular syringes can achieve muscle injection, but for micro-injection of certain drugs, not only manpower is required for injection, but also the scale on the outer surface of the syringe needs to be observed, which makes the injection metering very difficult to control, and for muscles of different densities, the injection speed is also different, which increases the pain of the patient. During use, the syringe may be drawn inward for various reasons, resulting in contamination of the drug solution in the syringe, etc. Therefore, the present invention provides a portable intramuscular syringe, which can not only achieve automatic injection, but also achieve precise injection of micro-amounts of drug solution, reducing the influence of human factors. When there is no precise dose injection, manual injection can also be used. At the same time, the injection speed can be adjusted according to the different muscle densities of the patients, and the backdrawing that causes the drug solution in the syringe to be contaminated is also prevented.

[0008] The present invention provides the following technical solutions: a portable intramuscular syringe, comprising a syringe, a piston handle, a piston, a power unit, an auxiliary unit, a one-way valve and a control unit, wherein the outer sides of the head and tail of the syringe are respectively provided with threads; a piston is slidably mounted inside the syringe; a circular groove is provided at the bottom of the piston; a circular groove is provided at the bottom of the piston for fixing and mounting a pressure sensor; the top of the piston is fixedly mounted at the tail end of the piston handle; the one-way valve comprises a trapezoidal frustum plug, a hollow cylinder, a cylinder and a spring; a hollow cylinder is vertically fixedly mounted at the bottom of the trapezoidal frustum plug; a spring is vertically fixedly mounted at the bottom of the trapezoidal frustum plug, and the spring is located in the hollow cylinder; the bottom end of the spring is fixedly mounted at the bottom of the cylinder; the outer side of the bottom end of the hollow cylinder is slidably mounted on the inner side of the top end of the cylinder; a power unit is fixedly mounted on the head of the syringe, and the power unit is used to provide power to the syringe; an auxiliary unit is fixedly mounted on the tail of the syringe; the auxiliary unit is used to assist in the extraction of liquid medicine; a control unit is fixedly mounted inside the power unit; the power unit is electrically connected to the control unit.

[0009] Preferably, the power unit includes a power cylinder, an electric push rod, and an electromagnet; an electric push rod is fixedly installed inside the top of the power cylinder; an electromagnet is fixedly installed on the electric push rod; the electromagnet is a conical structure; a thread is provided on the inner side of the bottom end of the power cylinder, and the electromagnet and the permanent magnet on the piston handle attract each other; and is used to pull the piston handle.

[0010] Preferably, a permanent magnet is fixedly mounted on the head of the piston handle; the permanent magnet is a conical groove; the permanent magnet and the electromagnet attract each other; a circular ring is fixedly mounted above the permanent magnet; the circular ring is used for manual injection.

[0011] Preferably, the auxiliary unit includes an auxiliary cylinder, a circular stopper and a disc; a thread is provided on the inner side surface of the top end of the auxiliary cylinder; a circular stopper is fixedly installed on the inner wall below the thread of the top end of the auxiliary cylinder; a conical groove is axially opened at the center position of the bottom of the circular stopper; a hole is axially opened at the center position of the top of the circular stopper, and is connected with the conical groove; four conical holes are respectively opened at 90° around the bottom of the circular stopper; four through holes are respectively opened at 90° radially around the inner side of the center hole of the circular stopper, and are respectively connected with the four conical holes; the conical groove at the center position of the bottom of the circular stopper is used to cooperate with the trapezoidal frustum plug of the one-way valve, and is set to a conical structure to ensure its sealing, and can also achieve the effect of automatic centering.

[0012] Preferably, a one-way valve is fixedly installed on the top of the disc; a No. 1 cylinder is provided at the bottom of the disc; a No. 1 groove is provided at the center of the bottom of the No. 1 cylinder; the bottom of the auxiliary cylinder and the No. 1 cylinder at the bottom of the disc are sealed and slidably installed; a thread is provided at the middle position of the outer side of the No. 1 cylinder, and the thread is located on the outer side of the bottom of the auxiliary cylinder; a No. 1 through hole is radially provided on the No. 1 cylinder; the No. 1 through hole is located between the bottom of the disc and the top of the thread; the bottom of the auxiliary cylinder is rotatably installed with the top of the nut; a nut is rotatably installed on the outer side of the middle of the No. 1 cylinder; four solid cylinders are axially arranged at 90° around the top of the disc, and conical bosses are respectively provided on the tops of the four solid cylinders; the No. 1 through hole is used for the flow channel of the drug solution during extraction and injection; the nut and the thread cooperate with each other, and the nut is used to control the rise and fall of the disc.

[0013] Preferably, the bottom of the trapezoidal cone plug on the one-way valve is sealed and connected to one end of the elastic sealing cloth; the other end of the elastic sealing cloth is sealed and connected to the top of the hollow cylinder; the elastic sealing cloth is used to prevent the drug solution from entering the inside of the one-way valve.

[0014] Preferably, sealing gaskets are fixedly installed on the inner side surface of the conical groove at the bottom center of the circular stopper and on the outer surface around the trapezoidal cone plug; sealing gaskets are fixedly installed on the inner walls of the four conical holes around the bottom of the circular stopper and on the outer surface of the conical boss at the top of the solid cylinder; the sealing gaskets are made of rubber material.

[0015] Preferably, a pressure sensor is fixedly installed on the bottom of the piston; a layer of elastic sealing film is fixedly installed on the surface of the pressure sensor; the pressure sensor is electrically connected to the control unit; a plurality of preset values ​​are set in the control unit; when the pressure sensor detects pressure, it sends a signal to the control unit.

[0016] Preferably, a sealing cap is fixedly mounted on the syringe head, and a circular hole slightly larger than the diameter of the piston handle is opened in the center of the sealing cap; the central hole of the sealing cap is larger than the diameter of the piston handle in order to prevent negative pressure from being formed between the top of the piston and the sealing cap when the syringe is drawn and injected, causing the piston to be unable to move normally.

[0017] Preferably, the syringe, power cylinder and auxiliary cylinder are all made of polyethylene material, and are transparent materials; the polyethylene material has good high temperature resistance and corrosion resistance, and polyethylene is non-toxic.

[0018] Preferably, a fixing ring is fixedly installed on the top of the disc 33, and the fixing ring is used to fix the one-way valve. The fixing ring is located between the solid cylinder and the one-way valve, and can fix the one-way valve well.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention has a power unit fixedly installed on the head of the syringe, the power unit includes a power cylinder, an electric push rod and an electromagnet, the electric push rod is fixedly installed inside the top of the power cylinder, the electromagnet is fixedly installed on the electric push rod, and a thread is arranged on the inner side of the bottom of the power cylinder, so that the syringe is automatically controlled by the electric push rod to perform micro-precise injection, and manual injection can also be used when there is no precise dose injection.

[0021] 2. The present invention has an auxiliary unit fixedly installed at the tail of the syringe, the auxiliary unit includes an auxiliary cylinder, a circular stopper, a fixing ring and a disc, a thread is arranged on the inner side surface of the top end of the auxiliary cylinder; a circular stopper is fixedly installed on the inner wall below the thread of the top end of the auxiliary cylinder, a one-way valve is fixedly installed on the disc, and a No. 1 cylindrical seal is slidably installed between the bottom of the auxiliary cylinder and the bottom of the disc, thereby preventing the syringe from being drawn back during use and causing the liquid in the syringe to be contaminated.

[0022] 3. The present invention realizes real-time detection of drug pressure during the injection process by fixing a pressure sensor in the groove at the bottom of the piston, and judges the patient's muscle density by the pressure, thereby controlling the injection speed and reducing the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0025] Figure 2 It is a cross-sectional view of the present invention.

[0026] Figure 3 This is a diagram of the present invention during injection.

[0027] Figure 4 This is a diagram of the present invention during extraction.

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the fixing ring of the present invention.

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the disc of the present invention.

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the circular stopper of the present invention.

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the one-way valve of the present invention.

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure inside the one-way valve of the present invention.

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the piston handle and the piston of the present invention.

[0034] In the figure: syringe 1, ring 11, piston handle 12, piston 13, circular groove 14, cover 15, permanent magnet 16, power unit 2, power cylinder 21, electric push rod 22, electromagnet 23, auxiliary unit 3, auxiliary cylinder 31, circular stopper 32, conical groove 321, conical hole 322, hole 323, through hole 324, disc 33, No. 1 through hole 34, No. 1 cylinder 35, No. 1 groove 36, solid cylinder 37, conical boss 38, fixing ring 39, one-way valve 4, truncated cone plug 41, hollow cylinder 42, cylinder 43, spring 44, elastic sealing cloth 45, nut 5. DETAILED DESCRIPTION

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 8 and Fig. 9As shown, a portable intramuscular syringe comprises a syringe 1, a piston handle 12, a piston 13, a power unit 2, an auxiliary unit 3, a one-way valve 4 and a control unit, wherein the outer sides of the head and tail of the syringe 1 are respectively provided with threads; a piston 13 is slidably mounted inside the syringe 1; a circular groove 14 is provided at the bottom of the piston 13; a groove is provided at the bottom of the piston 13 for fixing and mounting a pressure sensor; the top of the piston 13 is fixedly mounted at the tail end of the piston handle 12; the one-way valve 4 comprises a trapezoidal frustum plug 41, a hollow cylinder 42, a cylinder 43 and a spring 44; a hollow cylinder 42 is vertically fixedly mounted at the bottom of the trapezoidal frustum plug 41; a spring 44 is vertically fixedly mounted at the bottom of the trapezoidal frustum plug 41, and the The spring 44 is located in the hollow cylinder 42; the bottom end of the spring 44 is fixedly mounted on the bottom of the cylinder 43; the outer side of the bottom end of the hollow cylinder 42 is slidably mounted on the inner side of the top of the cylinder 43; a power unit 2 is fixedly mounted on the head of the syringe 1, and the power unit 2 is used to provide power to the syringe; an auxiliary unit 3 is fixedly mounted on the tail of the syringe 1; the auxiliary unit 3 is used to assist in the extraction of liquid medicine; a control unit is fixedly mounted inside the power unit 2; the power unit 2 is electrically connected to the control unit, and the one-way valve 4 is used to prevent the liquid medicine from being contaminated due to human factors when the syringe is being injected or not in use. When the syringe has extracted the liquid medicine, it can only flow out in one direction and cannot be extracted back, thereby preventing contamination.

[0037] like Figures 1 to 4 As shown, the power unit 2 includes a power cylinder 21, an electric push rod 22, and an electromagnet 23; the electric push rod 22 is fixedly installed inside the top of the power cylinder 21; the electromagnet 23 is fixedly installed on the electric push rod 22; the electromagnet 23 is a conical structure; the electromagnet 23 is set to a conical structure in order to achieve the effect of automatic centering; the inner side of the bottom end of the power cylinder 21 is provided with a thread, and the electromagnet 23 and the permanent magnet 16 on the piston handle 12 attract each other; it is used to pull the piston handle 12, and the moving distance of the piston 13 is controlled by the electric push rod 22, thereby improving the accuracy of the movement of the piston 13, thereby achieving accurate control of the dosage of the injected liquid. Medical staff can control the syringe to inject the set dosage according to different needs by operating the button, thereby preventing excessive injection dosage due to human factors.

[0038] like Figure 2 , Figure 3 , Figure 4 , Fig.10As shown, a permanent magnet 16 is fixedly mounted on the head of the piston handle 12; the permanent magnet 16 is a conical groove; the permanent magnet 16 is set to a conical groove structure in order to achieve the effect of automatic centering; the permanent magnet 16 and the electromagnet 23 attract each other; when it is to be used, the electromagnet 23 will be energized, and the magnetic force is different from that of the permanent magnet 16, so that the permanent magnet 16 and the electromagnet 23 attract each other; a circular ring 11 is fixedly mounted above the permanent magnet 16; the circular ring 11 is used for the convenience of medical staff when performing manual injections.

[0039] like Figures 1 to 7 As shown, the auxiliary unit 3 includes an auxiliary cylinder 31, a circular stopper 32 and a disc 33; a thread is provided on the inner side surface of the top of the auxiliary cylinder 31; a circular stopper 32 is fixedly installed on the inner wall below the thread at the top of the auxiliary cylinder 31; a conical groove 321 is axially opened at the center of the bottom of the circular stopper 32; a hole 323 is axially opened at the center of the top of the circular stopper 32; and it is connected with the conical groove 321; four conical holes 322 are respectively opened at 90 degrees on the bottom of the circular stopper 32; the inner side of the central hole of the circular stopper 32 is radially 90 degrees around the inner side. Four through holes 324 are respectively opened at 0°, and are respectively connected with the four tapered holes 322; the tapered groove 321 at the center position of the bottom of the circular stopper 32 is used to cooperate with the trapezoidal frustum plug 41 of the one-way valve 4. The tapered structure is set to ensure its sealing performance and can also achieve automatic centering; the bottom of the circular stopper 32 is respectively opened with four tapered holes 322 at 90° to ensure its sealing performance. When extracting the medicine, it can pass through these four tapered holes 322. The four tapered holes 322 are set to speed up the extraction of the medicine.

[0040] like Figure 2 , Figure 3 , Figure 4 , Figure 6As shown, a one-way valve 4 is fixedly installed on the top of the disc 33; a No. 1 cylinder 35 is arranged at the bottom of the disc 33; a No. 1 groove 36 is provided at the center of the bottom of the No. 1 cylinder 35, and the bottom of the auxiliary cylinder 31 and the No. 1 cylinder 35 at the bottom of the disc 33 are sealed and slidably installed; a thread is provided at the middle position of the outer side of the No. 1 cylinder 35, and the thread is located on the outer side of the bottom of the auxiliary cylinder 31; a No. 1 through hole 34 is radially provided on the No. 1 cylinder 35; the No. 1 through hole 34 is located between the bottom of the disc 33 and the top of the thread; the bottom of the auxiliary cylinder 31 is rotatably installed with the top of the nut 5 The nut 5 is installed, and the nut 5 is threadedly connected with the No. 1 cylinder 35; four solid cylinders 37 are axially arranged at 90° around the top of the disk 33, and the tops of the four solid cylinders 37 are respectively provided with conical bosses 38; the No. 1 through hole 34 is used for the flow channel of the liquid medicine during extraction and injection; the nut 5 and the thread cooperate with each other to control the rise and fall of the disk 33, thereby controlling the cooperation between the conical boss 38 on the solid cylinder 37 and the conical hole 322 at the bottom of the circular block 32, ensuring its sealing, facilitating the extraction of the liquid medicine, and also speeding up the extraction and injection of the liquid medicine.

[0041] like Figures 2 to 4 As shown, the bottom of the trapezoidal cone plug 41 on the one-way valve 4 is sealed and connected to one end of the elastic sealing cloth 45; the other end of the elastic sealing cloth 45 is sealed and connected to the top of the hollow cylinder 42; the elastic sealing cloth 45 is used to prevent the drug liquid from entering the one-way valve 4 and accumulating at the bottom of the one-way valve 4, causing waste of the drug liquid, and also prevents certain acidic or alkaline drug liquids from corroding the spring 44, causing serious contamination of the drug liquid and a decrease in the elastic potential energy of the spring 44, resulting in a decrease in sealing performance.

[0042] Sealing gaskets are fixedly installed on the inner side surface of the conical groove 321 at the center of the circular stopper 32 and on the outer surface around the trapezoidal cone plug 41; sealing gaskets are fixedly installed on the inner walls of the four conical holes 322 around the bottom of the circular stopper 32 and on the outer side surface of the conical boss 38 at the top of the solid cylinder 37; the sealing gaskets are made of rubber material, and sealing gaskets of the same size are set according to the sizes of different mating parts. The sealing gaskets are used to ensure their sealing when extracting and injecting liquid medicine.

[0043] like Figures 2 to 4As shown, a pressure sensor is fixedly installed at the bottom of the piston 13; a layer of elastic sealing film is fixedly installed on the surface of the pressure sensor; the pressure sensor is electrically connected to the control unit; a plurality of preset values ​​are set in the control unit; when the pressure sensor detects pressure, it sends a signal to the control unit, and according to the different muscle density of the patient, the corresponding preset value is set by the size of the liquid pressure during injection. When the detected pressure exceeds the preset value, the control unit sends a signal to control the pushing speed of the electric push rod 22, adjust the feeding speed of the piston 13, and thus adjust the injection speed of the liquid medicine.

[0044] like Figures 1 to 4 As shown, a cover 15 is fixedly installed on the head of the syringe 1, and a circular hole slightly larger than the diameter of the piston handle 12 is opened in the center of the cover 15; the central hole of the cover 15 is larger than the diameter of the piston handle 12 to prevent negative pressure from being formed between the top of the piston 13 and the cover 15 when the syringe is drawn and injected, resulting in the piston 13 being unable to move normally. When the power cylinder 21 is removed, the cover 15 can ensure that impurities will not enter the syringe 1, preventing the syringe 1 from being contaminated, and can also play a role in fixing the piston handle 12 so that the piston handle 12 will not move radially.

[0045] The syringe 1, the power cylinder 21 and the auxiliary cylinder 31 are all made of polyethylene material, and are transparent materials; the polyethylene material has good high temperature resistance and corrosion resistance, and polyethylene is non-toxic; a scale is set on the syringe 1, and the transparent material is for medical staff to observe the internal situation well with the naked eye, and also to observe the dosage when extracting and injecting the liquid medicine. The transparent material can also observe the internal parts of the power cylinder and the auxiliary cylinder. After a long period of use, the damage of the internal parts can be identified, which is convenient for timely replacement.

[0046] like Figures 2 to 5 As shown, a fixing ring 39 is fixedly installed on the top of the disc 33. The fixing ring 39 is used to fix the one-way valve 4. The fixing ring 39 is located between the solid cylinder 37 and the one-way valve 4, and can fix the one-way valve 4 well so that the one-way valve 4 does not rotate on the disc 33.

[0047] During operation, when extracting liquid medicine, the nut 5 at the bottom of the auxiliary cylinder 31 is rotated, and the disk 33 in the auxiliary cylinder 31 is driven to move downward through the nut 5, and the disk 33 drives the solid cylinder 37 to move downward, so that the conical boss 38 at the top of the solid cylinder 37 moves downward from the conical holes 322 around the bottom of the circular stopper 32, and at the same time, the bottom of the one-way valve 4 moves downward with the disk 33, and the spring 44 is extended by elastic potential energy, and the trapezoidal frustum plug 41 is always in contact and sealed with the conical groove 321 at the bottom of the circular stopper 32, and the extraction button on the outside of the power cylinder 21 is manually pressed to give The control unit sends a signal, and the control unit receives the signal to control the electric push rod 22 to contract, driving the piston handle 12 to rise, and the piston handle 12 drives the piston 13 to rise, and a negative pressure is formed under the piston 13, and the liquid medicine begins to be extracted into the syringe 1. When the liquid medicine is extracted, the button is pressed again, the electric push rod 22 stops moving, and the piston 13 no longer rises. At this time, the nut 5 at the bottom of the auxiliary cylinder 31 is rotated in the opposite direction, and the disc 33 drives the solid cylinder 37 to move upward, so that the tapered holes 322 around the bottom of the circular stopper 32 and the tapered boss 38 on the top of the solid cylinder 37 are in sealing contact with each other.

[0048] During the injection process, the dosage button on the outside of the power cylinder 21 is pressed to send a signal to the control unit. After receiving the signal, the control unit controls the electric push rod 22 to be pushed out. The electric push rod 22 drives the piston handle 12 to move downward. The piston handle 12 drives the piston 13 to drop. The piston 13 pushes the liquid medicine into the patient's body. At the same time, during the injection process, the pressure sensor at the bottom of the piston 13 detects the pressure of the liquid medicine in the syringe 1 in real time. By judging the pressure of the liquid medicine and the preset value in the control unit, the pushing speed of the electric push rod 22 is controlled, thereby controlling the speed of injection.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A portable intramuscular syringe, comprising a syringe (1), a piston handle (12), a piston (13), a power unit (2), an auxiliary unit (3), a one-way valve (4) and a control unit, characterized in that: The outer sides of the head and tail of the syringe (1) are respectively provided with threads; a piston (13) is slidably mounted inside the syringe (1); a circular groove (14) is provided at the bottom of the piston (13); the top of the piston (13) is fixedly mounted on the tail end of the piston handle (12); the one-way valve (4) comprises a trapezoidal frustum plug (41), a hollow cylinder (42), a cylinder (43) and a spring (44); a hollow cylinder (42) is vertically fixedly mounted at the bottom of the trapezoidal frustum plug (41); a spring (44) is vertically fixedly mounted at the bottom of the trapezoidal frustum plug (41), and the The spring (44) is located in the hollow cylinder (42); the bottom end of the spring (44) is fixedly mounted in the bottom of the cylinder (43); the outer side of the bottom end of the hollow cylinder (42) is slidably mounted on the inner side of the top end of the cylinder (43); a power unit (2) is fixedly mounted on the head of the syringe (1), and the power unit (2) is used to provide power to the syringe; an auxiliary unit (3) is fixedly mounted on the tail of the syringe (1); the auxiliary unit (3) is used to assist in the extraction of liquid medicine; a control unit is fixedly mounted inside the power unit (2); the power unit (2) is electrically connected to the control unit; The auxiliary unit (3) comprises an auxiliary cylinder (31), a circular stopper (32) and a disc (33); a thread is provided on the inner side surface of the top end of the auxiliary cylinder (31); a circular stopper (32) is fixedly mounted on the inner side wall below the thread at the top end of the auxiliary cylinder (31); a conical groove (321) is axially provided at the center position of the bottom of the circular stopper (32); a hole (323) is axially provided at the center position of the top of the circular stopper (32) and is connected with the conical groove (321); four conical holes (322) are respectively provided at 90° on the bottom of the circular stopper (32); four through holes (324) are respectively provided at 90° on the inner side of the center hole of the circular stopper (32) and are respectively connected with the four conical holes (322); a one-way valve (4) is fixedly mounted on the top of the disc (33); the disc ( A No. 1 cylinder (35) is provided at the bottom of the disc (33); a No. 1 groove (36) is provided at the center of the bottom of the No. 1 cylinder (35); the bottom of the auxiliary cylinder (31) is sealed and slidably installed with the No. 1 cylinder (35) at the bottom of the disc (33); a thread is provided at the middle position of the outer side of the No. 1 cylinder (35), and the thread is located at the outer side of the bottom of the auxiliary cylinder (31); a No. 1 through hole (34) is radially provided on the No. 1 cylinder (35); the No. 1 through hole (34) is located between the bottom of the disc (33) and the top of the thread; the bottom of the auxiliary cylinder (31) is rotatably installed with the top of the nut (5), and the nut (5) and the No. 1 cylinder (35) are threadedly connected; four solid cylinders (37) are provided around the top of the disc (33) at an axial angle of 90°, and the tops of the four solid cylinders (37) are respectively provided with conical bosses (38; The bottom periphery of the trapezoidal truncated cone plug (41) on the one-way valve (4) is sealed to one end of an elastic sealing cloth (45); the other end of the elastic sealing cloth (45) is sealed to the top periphery of the hollow cylinder (42); A fixing ring (39) is fixedly mounted on the top of the disc (33), and the fixing ring (39) is used to fix the one-way valve (4).

2. A portable intramuscular injector according to claim 1, characterized in that: The power unit (2) comprises a power cylinder (21), an electric push rod (22), and an electromagnet (23); the electric push rod (22) is fixedly mounted inside the top end of the power cylinder (21); the electromagnet (23) is fixedly mounted on the electric push rod (22); the electromagnet (23) is a conical structure; and a thread is arranged on the inner side of the bottom end of the power cylinder (21).

3. A portable intramuscular injector according to claim 2, characterized in that: A permanent magnet (16) is fixedly mounted on the head of the piston handle (12); the permanent magnet (16) is a conical groove; and a circular ring (11) is fixedly mounted above the permanent magnet.

4. A portable intramuscular injector according to claim 1, characterized in that: Sealing gaskets are fixedly mounted on the inner side surface of the conical groove (321) at the center of the circular stopper (32) and on the outer surface of the trapezoidal truncated cone plug (41); sealing gaskets are fixedly mounted on the inner walls of the four conical holes (322) around the bottom of the circular stopper (32) and on the outer surface of the conical boss (38) at the top of the solid cylinder (37).

5. A portable intramuscular injector according to claim 4, characterized in that: A pressure sensor is fixedly mounted on the bottom of the piston (13); and a layer of elastic sealing film is fixedly mounted on the surface of the pressure sensor.

6. A portable intramuscular injector according to claim 5, characterized in that: A sealing cover (15) is fixedly mounted on the head of the syringe (1), and a circular hole slightly larger than the diameter of the piston handle (12) is opened in the center of the sealing cover (15).

7. A portable intramuscular injector according to claim 6, characterized in that: The needle cylinder (1), the power cylinder (21) and the auxiliary cylinder (31) are all made of polyethylene material.

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