A subcutaneous injection metered dose injection device

Abstract

The application relates to the technical field of medical devices, in particular to a subcutaneous injection quantitative injection device which comprises an injection storage tube, a piston disc, a piston connecting rod, a positioning screw cap, a medicine pushing spring, a setting external thread and a setting pushing disc. The inside of the injection storage tube is movably provided with the piston disc. The side surface of the piston disc is fixedly provided with the piston connecting rod. The inside of the injection storage tube is provided with a pressing communication structure close to one end. The pressing communication structure is in a normally closed state and is communicated when being pressed. The other end of the injection storage tube is screwedly provided with the positioning screw cap. The piston connecting rod penetrates through the positioning screw cap. The medicine pushing spring is arranged on the outside of the piston connecting rod. The subcutaneous injection quantitative injection device can change the position of the setting pushing disc, pre-set the pushing stroke of the piston disc during injection, and thus realizes quantitative injection. The structure is simple and convenient to use.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a subcutaneous injection quantitative injection device. Background Technology

[0002] Subcutaneous injection is a route of drug administration that uses a syringe or other injection device to inject medication below the skin layer and above the muscle layer. Existing syringes, such as the disposable, safe, and destructible syringe disclosed in Chinese patent CN2741587Y, include: a disposable, safe, and destructible syringe with an outer casing, a core rod inside the casing, a piston above the core rod, the core rod and piston being fixedly connected, a cylindrical head integral with the outer casing, a cylindrical hole inside the cylindrical head, an injection needle inside the cylindrical hole, a protective sleeve covering the cylindrical head, and the injection needle consisting of a needle hub and a needle tube. The needle is provided with a through hole, and part of the needle tube is placed in the through hole. The needle tube is bonded to the needle seat. An arc-shaped cam ring is provided in the cylindrical hole. The needle seat and the arc-shaped cam ring are tightly sealed to prevent the injection needle from retracting during injection and to separate when the injection needle is pulled back. The head of the core rod is provided with a hook-shaped clip, and the bottom of the needle seat is provided with a beveled edge. After the liquid is injected, the core rod is pushed forward. The hook-shaped clip at the head of the core rod hooks the beveled edge at the bottom of the needle seat. Pulling back the core rod will pull the injection needle back into the outer sleeve, and the needle tip will be biased towards the inner wall of the outer sleeve, so that the injection needle pulled back into the outer sleeve cannot be pushed out again. The needle seat is provided with an air vent to remove air after liquid is drawn.

[0003] When performing subcutaneous injections, because the needle is inserted to a shallow depth, a 30-degree angled insertion method is often used. In existing syringes, as described in the aforementioned patent, the physician needs to apply a pushing force to the tail of the syringe during injection. At this time, the physician's hand muscles are in a tense state, which is not conducive to the stability of the angled insertion. Furthermore, it is impossible to pre-set the dosage of the injected drug, and the dosage can only be controlled by feel, which is not precise enough and has low safety. Summary of the Invention

[0004] The purpose of this invention is to provide a subcutaneous injection quantitative injection device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a subcutaneous injection quantitative injection device, comprising an injection storage tube, a piston disc, a piston rod, a positioning threaded cap, a drug-push spring, a setting external thread, and a setting push plate. The piston disc is movably disposed inside the injection storage tube. A piston rod is fixedly disposed on one side surface of the piston disc. A pressing and connecting structure is disposed inside the injection storage tube near one end. The pressing and connecting structure is normally closed but opens when pressed. A positioning threaded cap is screwed onto the other end of the injection storage tube. The piston rod passes through the positioning threaded cap. A drug-push spring is sleeved on the outside of the piston rod. The drug-push spring is located between the inner wall surfaces of the piston disc and the positioning threaded cap and is in a compressed state. A setting external thread is formed on the outer surface of the piston rod. The setting push plate is screwed onto the outside of the setting external thread.

[0006] The pressing and connecting structure includes a first partition, a second partition, a second support tube, a first support tube, a rubber cable tray hose, a compression plate, a compression outer frame, a compression ridge, a drive spring, a pressing top column, a tube wall sleeve, and a pressing button plate.

[0007] Both the first partition and the second partition are fixedly disposed inside the injection storage tube, and there is a certain gap between the first partition and the second partition. A first support tube is fixedly disposed on the surface of the first partition, and a second support tube is fixedly disposed on the surface of the second partition.

[0008] A rubber cable tray hose is installed between the second support tube and the first support tube. The rubber cable tray hose is elastic. An extrusion plate is fixedly installed above the rubber cable tray hose. The width of the extrusion plate is greater than the diameter of the rubber cable tray hose. The two ends of the extrusion plate are fixedly installed to the first partition plate and the second partition plate, respectively. An extrusion frame is fitted around both the rubber cable tray hose and the extrusion plate.

[0009] An extrusion ridge is fixedly provided on the inner lower surface of the extrusion frame. The extrusion ridge contacts the outer surface of the rubber cable tray hose. The driving spring is located below the rubber cable tray hose. One end of the driving spring is fixedly connected to the outer surface of the first partition plate. The driving spring is elastically bent and applies an upward elastic force to the extrusion frame. A pressing pin is fixedly provided on the upper surface of the extrusion frame. A tube wall sleeve is provided on the surface of the injection storage tube. One end of the pressing pin passes through the tube wall sleeve and extends to the outside of the injection storage tube. A pressing button is fixedly provided at the end of the pressing pin. The pressing button is located outside the injection storage tube.

[0010] One end of the injection storage tube is connected to an injection nozzle, the press-connect structure is located near the injection nozzle, a needle cap is fixedly fitted over the injection nozzle, and an injection needle is embedded and fixed at the end of the needle cap.

[0011] The piston disc is disc-shaped, and a rubber sealing sleeve is fixedly fitted on its outer surface. The rubber sealing sleeve is in sealing contact with the inner wall surface of the injection storage tube. An anti-rotation plate is fixedly installed at the end of the piston rod away from the piston disc. The anti-rotation plate is flat.

[0012] The surface of the positioning threaded cover is provided with a through-hole of air pressure grooves, which are evenly distributed in a circumferential array. A positioning rod sleeve is fixedly installed at the center of the positioning threaded cover. The positioning rod sleeve is a short cylindrical tube with a smooth inner wall surface. The piston connecting rod passes through the positioning rod sleeve. Guide bevels are respectively opened at both ends of the inner wall surface of the positioning rod sleeve. A helical fitting sleeve is fixedly installed at the center of the setting push plate. The helical fitting sleeve is a short cylindrical tube with an internal thread on its inner wall surface. The setting external thread is helically engaged with the aforementioned internal thread.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The present invention provides a subcutaneous injection quantitative injection device that can achieve quantitative injection by changing the position of the set push plate and pre-setting the advancement stroke of the piston plate during injection. It has a simple structure and is easy to use.

[0015] The designed press-and-connect structure keeps the end of the injection storage tube near the needle in a normally closed state. This reduces the entry of dust and bacteria into the injection storage tube during daily storage, promoting aseptic preservation. Furthermore, unlike traditional syringes, no force needs to be applied to the tail end during injection; simply pressing the button allows for automatic drug delivery, reducing the force required by the physician's hand and improving hand stability during the injection process. The button's proximity to the needle, especially during subcutaneous tilted injections, further facilitates operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle.

[0018] Figure 3 This is the front view of the present invention.

[0019] Figure 4 This is a three-dimensional half-sectional schematic diagram of the present invention.

[0020] Figure 5 This is a three-dimensional half-section front view of the present invention.

[0021] Figure 6 This is a cross-sectional view of the injection storage tube.

[0022] In the diagram: 1. Injection storage tube; 2. Piston disc; 3. Piston connecting rod; 4. Positioning threaded cap; 5. Drug pushing spring; 6. Setting external thread; 7. Setting push plate; 101. First partition plate; 102. Second partition plate; 103. Second support tube; 104. First support tube; 105. Rubber bridge hose; 106. Extrusion plate; 107. Extrusion outer frame; 108. Extrusion protrusion; 109. Drive spring; 110. Pressing top column; 111. Tube wall sleeve; 112. Pressing knob; 113. Injection nozzle; 114. Needle cap; 115. Injection needle; 201. Rubber sealing sleeve; 301. Anti-rotation and torsion plate; 401. Air pressure groove; 402. Positioning rod sleeve; 403. Guide angle; 701. Spiral fitting sleeve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 6 This invention provides a technical solution: a subcutaneous injection quantitative injection device, comprising an injection storage tube 1, a piston disc 2, a piston connecting rod 3, a positioning threaded cover 4, a drug-push spring 5, a setting external thread 6, and a setting push plate 7. The piston disc 2 is movably disposed inside the injection storage tube 1, and the piston connecting rod 3 is fixedly disposed on one side surface of the piston disc 2. A press-and-connect structure is disposed inside the injection storage tube 1 near one end. The press-and-connect structure is normally closed and connected when pressed. The positioning threaded cover 4 is screwed onto the other end of the injection storage tube 1. The piston connecting rod 3 passes through the positioning threaded cover 4. The drug-push spring 5 is sleeved on the outside of the piston connecting rod 3. The drug-push spring 5 is located between the inner wall surface of the piston disc 2 and the positioning threaded cover 4. The drug-push spring 5 is in a compressed state. The setting external thread 6 is formed on the outer surface of the piston connecting rod 3, and the setting push plate 7 is screwed onto the outside of the setting external thread 6.

[0025] The press-connect structure includes a first partition 101, a second partition 102, a second support tube 103, a first support tube 104, a rubber cable tray hose 105, an extrusion plate 106, an extrusion outer frame 107, an extrusion ridge 108, a drive spring 109, a press top column 110, a tube wall sleeve 111, and a press button 112.

[0026] Both the first partition 101 and the second partition 102 are fixedly disposed inside the injection storage tube 1. There is a certain gap between the first partition 101 and the second partition 102. The surface of the first partition 101 is fixedly connected to the first support tube 104, and the surface of the second partition 102 is fixedly connected to the second support tube 103.

[0027] A rubber cable tray hose 105 is installed between the second support tube 103 and the first support tube 104. The rubber cable tray hose 105 is elastic. An extrusion plate 106 is fixedly installed above the rubber cable tray hose 105. The width of the extrusion plate 106 is greater than the diameter of the rubber cable tray hose 105. The two ends of the extrusion plate 106 are fixedly installed to the first partition 101 and the second partition 102, respectively. An extrusion frame 107 is fitted around both the rubber cable tray hose 105 and the extrusion plate 106.

[0028] An extrusion ridge 108 is fixedly provided on the lower inner surface of the extrusion frame 107. The horizontal cross-section of the extrusion ridge 108 gradually decreases from bottom to top, thereby reducing the contact area with the rubber cable tray hose 105 and increasing the contact pressure. The extrusion ridge 108 contacts the outer surface of the rubber cable tray hose 105. The driving spring 109 is located below the rubber cable tray hose 105. One end of the driving spring 109 is fixedly connected to the outer surface of the first partition 101. The driving spring 109 bends elastically and applies an upward elastic force to the extrusion frame 107. A pressing top post 110 is fixedly provided on the upper surface of the extrusion frame 107. A tube wall sleeve 111 is provided on the surface of the injection storage tube 1. One end of the pressing top post 110 passes through the tube wall sleeve 111 and extends to the outside of the injection storage tube 1. A pressing button 112 is fixedly provided at the end of the pressing top post 110. The pressing button 112 is located outside the injection storage tube 1.

[0029] One end of the injection storage tube 1 is connected to an injection nozzle 113. A press-connecting structure is located near the injection nozzle 113. A needle cap 114 is fixedly fitted over the injection nozzle 113. An injection needle 115 is embedded and fixed at the end of the needle cap 114.

[0030] The piston disc 2 is disc-shaped, and a rubber sealing sleeve 201 is fixedly fitted on its outer surface. The rubber sealing sleeve 201 is in sealing contact with the inner wall surface of the injection storage tube 1. An anti-rotation plate 301 is fixedly installed at one end of the piston rod 3 away from the piston disc 2. The anti-rotation plate 301 is flat.

[0031] The surface of the positioning threaded cover 4 is provided with a through air pressure slot 401, which is evenly distributed in a circumferential array. A positioning rod sleeve 402 is fixedly installed at the center of the positioning threaded cover 4. The positioning rod sleeve 402 is a short cylindrical tube with a smooth inner wall surface. The piston connecting rod 3 passes through the positioning rod sleeve 402. Guide angles 403 are respectively opened at both ends of the inner wall surface of the positioning rod sleeve 402. The guide angles 403 play a guiding role. During the axial movement of the setting external thread 6, when it is tilted under force, it prevents the thread of the setting external thread 6 from blocking and jamming with the positioning rod sleeve 402. A spiral fitting sleeve 701 is fixedly installed at the center of the setting push plate 7. The spiral fitting sleeve 701 is a short cylindrical tube with an internal thread on its inner wall surface. The setting external thread 6 is helically engaged with the aforementioned internal thread.

[0032] When using the injection device of the present invention, to draw the medicine, the injection needle 115 is inserted into the medicine bottle, one hand holds the injection storage tube 1 and presses the button 112 at the same time, and the other hand pulls the setting push plate 7 to move backward, so that the piston plate 2 moves backward, thereby realizing the medicine drawing.

[0033] When the button 112 is pressed, the outer frame 107 and the extrusion ridge 108 move downwards, reducing the pressure of the extrusion ridge 108 on the rubber cable tray hose 105. At this time, the second support tube 103 and the first support tube 104 are connected through the rubber cable tray hose 105, thus allowing the medicine to flow. Figure 4 As shown, the button 112 is in the pressed state; conversely, when the button 112 is released, the spring force of the drive spring 109 causes the extrusion ridge 108 to be extruded and moved upward, flattening and sealing the rubber bridge hose 105 to prevent the medicine from flowing.

[0034] After drawing the medication, releasing the pressing knob 112 will seal the medication inside the injection storage tube 1. At this time, the push spring 5 will remain in a compressed state. By pinching the anti-rotation plate 301 and rotating the setting push plate 7, the injection volume can be set. The distance between the positioning rod sleeve 402 and the spiral fitting sleeve 701 is equal to the pushing stroke of the piston plate 2 during the injection process. After setting the appropriate injection volume, hold the injection storage tube 1 and insert the injection needle 115 under the skin at an angle for injection. During injection, simply pressing the pressing knob 112 will connect the rubber bridge hose 105. The medication inside the injection storage tube 1 will be automatically injected into the patient's body under the elastic force of the push spring 5, without the need for the doctor to apply pushing force at the end, making the injection more stable.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hypodermic injection device, comprising an injection storage tube (1), a piston disc (2), a piston connecting rod (3), a positioning threaded cap (4), a medicine pushing spring (5), a setting external thread (6) and a setting pushing disc (7), the inside of the injection storage tube (1) is movably provided with the piston disc (2), and the side surface of the piston disc (2) is fixedly provided with the piston connecting rod (3), characterized in that: The inside of the injection storage tube (1) is provided with a pressing communication structure near one end, which is normally closed and communicated when pressed, the other end of the injection storage tube (1) is screw fitted with a positioning threaded cap (4), the piston connecting rod (3) penetrates through the positioning threaded cap (4), the outer sleeve of the piston connecting rod (3) is provided with a medicine pushing spring (5), the medicine pushing spring (5) is located between the piston disc (2) and the inner wall surface of the positioning threaded cap (4), the medicine pushing spring (5) is in a compressed state, the outer surface of the piston connecting rod (3) is provided with a set external thread (6), and the set push disc (7) is screw fitted outside the set external thread (6).

2. A device for subcutaneous dosing according to claim 1, characterized in that: The pressing communication structure comprises a first partition disc (101), a second partition disc (102), a second frame tube (103), a first frame tube (104), a rubber bridge soft tube (105), an extrusion fixed plate (106), an extrusion outer frame (107), an extrusion rib (108), a driving spring piece (109), a pressing top column (110), a tube wall sleeve (111) and a pressing button disc (112).

3. A device for subcutaneous dosing according to claim 2, characterized in that: The first partition disc (101) and the second partition disc (102) are fixedly arranged in the inside of the injection storage tube (1), and the first partition disc (101) and the second partition disc (102) have a certain gap therebetween, the surface of the first partition disc (101) is fixedly and communicatively provided with the first frame tube (104), and the surface of the second partition disc (102) is fixedly and communicatively provided with the second frame tube (103).

4. A device for subcutaneous dosing according to claim 3, characterized in that: The second frame tube (103) and the first frame tube (104) are communicatively arranged with the rubber bridge soft tube (105), the rubber bridge soft tube (105) has elasticity, the upper portion of the rubber bridge soft tube (105) is fixedly provided with the extrusion fixed plate (106), the width of the extrusion fixed plate (106) is greater than the diameter of the rubber bridge soft tube (105), and the two ends of the extrusion fixed plate (106) are fixedly installed with the first partition disc (101) and the second partition disc (102) respectively, and the outer portions of the rubber bridge soft tube (105) and the extrusion fixed plate (106) are sleeved with the extrusion outer frame (107).

5. A device for subcutaneous dosing according to claim 4, characterized in that: The inner lower surface of the extrusion outer frame (107) is fixedly provided with an extrusion ridge (108) in contact with the outer surface of the rubber bridge soft tube (105), the driving elastic sheet (109) is arranged below the rubber bridge soft tube (105), one end of the driving elastic sheet (109) is fixedly connected with the outer surface of the first partition disc (101), the driving elastic sheet (109) is elastically bent and applies an upward elastic force to the extrusion outer frame (107), the upper surface of the extrusion outer frame (107) is fixedly provided with a pressing top column (110), the surface of the injection storage tube (1) is communicatively provided with a tube wall sleeve (111), one end of the pressing top column (110) penetrates through the tube wall sleeve (111) and extends to the outside of the injection storage tube (1), and the end of the pressing top column (110) is fixedly provided with a pressing knob disc (112) located outside the injection storage tube (1).

6. A device for subcutaneous dosing according to claim 1, characterized in that: One end of the injection storage tube (1) is communicatively provided with an injection nozzle (113), the pressing communication structure is arranged close to the injection nozzle (113), and the outside of the injection nozzle (113) is fixedly sleeved with a needle cap (114), and the end of the needle cap (114) is fixedly embedded with an injection needle (115).

7. A device for subcutaneous dosing according to claim 1, characterized in that: The piston disc (2) is disc-shaped, and a rubber sealing sleeve (201) is fixedly sleeved on the outer surface of the piston disc (2), the rubber sealing sleeve (201) is in sealing contact with the inner wall surface of the injection storage tube (1), and the end of the piston connecting rod (3) away from the position of the piston disc (2) is fixedly provided with an anti-rotation plate (301), and the anti-rotation plate (301) is flat.

8. A device for subcutaneous dosing according to claim 1, characterized in that: The surface of the positioning threaded cap (4) is provided with a gas pressure groove hole (401), the gas pressure groove hole (401) is uniformly distributed in a circumferential array, the center of the positioning threaded cap (4) is fixedly provided with a positioning rod sleeve (402), the positioning rod sleeve (402) is in the shape of a short cylindrical tube, and the inner wall surface thereof is smooth, the piston connecting rod (3) penetrates through the positioning rod sleeve (402), the inner wall surface of the positioning rod sleeve (402) is provided with a guide inclined angle (403) close to the two ends, the center of the setting push disc (7) is fixedly provided with a spiral fitting sleeve (701), the spiral fitting sleeve (701) is in the shape of a short cylindrical tube, and the inner wall surface thereof is provided with an internal thread, and the setting external thread (6) is screwedly connected with the internal thread.

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