A device for nerve block drug delivery that is easy for a single person to operate.

Abstract

This invention belongs to the field of medical device technology. Addressing the problems of current devices for nerve block injection, which involve numerous steps leading to errors or delays and are inconvenient for single-handed operation under ultrasound guidance, this invention provides a new, easily operable device for nerve block injection. The device includes an anesthetic injector, a retraction injector, a three-way valve, and a quantitative retraction mechanism. The three-way valve is connected to the anesthetic injector, the retraction injector, and the quantitative retraction mechanism. The doctor can complete the retraction operation and automatically switch the pathway in the three-way valve by simply rotating the retraction component in the quantitative retraction mechanism with one hand. The retraction component limits the movement distance of the piston in the retraction injector. After retraction, the quantitative retraction mechanism automatically closes the sealing switch in the three-way valve, completing the automatic switching of the three-way valve so that anesthetic can be injected when the conditions for anesthetic injection are met.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a device for nerve block drug injection that is easy for single-person operation. Background Technology

[0002] Nerve block is the injection of local anesthetic around nerve trunks, plexuses, and ganglia to block nerve impulse conduction and produce anesthesia in the area they innervate. A single injection can achieve a large anesthetic area. Ultrasound-guided nerve block is a precise pain management technique that uses real-time ultrasound imaging to guide the doctor in accurately injecting anesthetic around the target nerve, blocking nerve conduction. Compared to traditional methods, it has higher accuracy, avoids damage to surrounding tissues, reduces patient pain, and improves surgical safety. Before each injection, aspiration is required to confirm that the needle tip is not in a blood vessel or cerebrospinal fluid, and that no air has entered. If blood is aspirated, the needle tip should be rotated 90° to 180° and withdrawn or advanced a few millimeters, then aspirated again. If blood is still present, the needle should be withdrawn and re-punctured until no blood, air, or cerebrospinal fluid is aspirated. Then, the local anesthetic is slowly injected in multiple doses.

[0003] Patent CN111529009B discloses a device for nerve block drug injection that is easy for single-person operation, including a base plate, a puncture needle, a retraction unit, and a drug injection unit. The base plate is provided with a negative pressure indicator window, a positive pressure indicator window, and a connector connected to the puncture needle. Negative pressure indicator diaphragms and positive pressure indicator diaphragms are respectively provided in the negative pressure indicator window and the positive pressure indicator window. The negative pressure indicator diaphragm divides the negative pressure indicator window into a negative pressure retraction chamber and a first cavity. The positive pressure indicator diaphragm divides the positive pressure indicator window into a positive pressure drug injection chamber and a second cavity. The negative pressure retraction chamber and the positive pressure drug injection chamber are connected to the connector through a retraction pipeline and a drug injection pipeline, respectively. Both the retraction pipeline and the drug injection pipeline are provided with push-button switches. During use, under ultrasound guidance, place the puncture needle at the target position. Open the push-button switch on the negative pressure aspiration line. If there is no blood return in the line and the negative pressure is maintained, it indicates that the puncture needle is properly positioned, has not entered a blood vessel, and meets the requirements for drug injection. Close the push-button switch on the negative pressure aspiration line. At this point, observe the positive pressure diaphragm bulging towards the second cavity; drug injection can begin. Open the push-button switch on the drug injection line to begin drug injection. Adjust the push-button switch as needed to complete the drug injection procedure.

[0004] However, the above-mentioned technical solution requires the doctor to continuously press the switch during the aspiration process. This means that the aspiration time needs to be precisely controlled during a single aspiration. In actual operation, the doctor needs to open the aspiration switch, observe the negative pressure, close the aspiration switch, and then open the injection switch. This involves many steps, which can easily lead to errors or delays and is not convenient for single-handed operation under actual ultrasound guidance. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of existing devices for nerve block drug injection, which have many steps that are prone to errors or delays and are not convenient for single-handed operation under actual ultrasound guidance.

[0006] To achieve the above objectives, the present invention provides a novel, easily operable device for nerve block injection, comprising an anesthetic injector, a retraction injector, a three-way valve, and a quantitative retraction mechanism. The mounting plate is detachably connected to the retraction injector; the three-way valve is connected to the anesthetic injector, the retraction injector, and the quantitative retraction mechanism. In use, the doctor holds the ultrasound probe with one hand and uses the other hand to rotate the retraction component in the quantitative retraction mechanism to complete the retraction operation and automatically switch the pathway in the three-way valve. The retraction component limits the movement distance of the piston in the retraction injector, preventing insufficient or excessive retraction. The doctor does not need to precisely control the piston's movement during retraction; they only need to monitor whether liquid is being drawn from the retraction injector. After retraction, the linkage component in the quantitative retraction mechanism automatically closes the sealing switch in the three-way valve, automatically switching the three-way valve so that anesthetic can be injected when the conditions for anesthetic injection are met. This device is simple and convenient to use, improving medical efficiency.

[0007] Based on the above technical concept, the technical solution adopted by this invention is as follows: A device for administering nerve block medication that is easy to operate by a single person includes an anesthetic injector and a retraction injector, and further includes: A three-way tubing is connected to an anesthetic syringe, a retraction syringe, and an injection needle, respectively, and the three-way tubing is equipped with a blocking switch for controlling the connection of the retraction syringe. Mounting plate, detachably connected to the back-pull syringe; The quantitative back-pull mechanism is mounted on the mounting plate and connected to both the plugging switch and the back-pull syringe. It is used to limit the total amount of back-pull by the back-pull syringe in a single operation and automatically closes the plugging switch after the back-pull is completed.

[0008] In the above technical solution, the preferred embodiment of the quantitative back-drawing mechanism includes: The retraction assembly has one end located above the mounting plate and connected to the retraction syringe, and the other end rotatably connected to the mounting plate; The tubing clip has one end located on the outside of the mounting plate and connected to the end of the aspiration syringe connected to the tee tubing, while the other end is slidably connected to the mounting plate. The linkage component is located inside the mounting plate, with one end abutting against the pipe clamp frame and the other end connected to the pullback component.

[0009] Further specifying the above technical solution, the pullback component includes: The retractable disc has an installation cylinder on its upper surface and a rotating rod at its bottom, which is rotatably connected to the installation plate. The mounting rod passes through the retraction syringe and connects to the mounting tube.

[0010] To further specify the above technical solution, the linkage components include: The transmission unit is located inside the mounting plate, and one end is connected to the bottom end of the rotating rod. The L-shaped lever has one end inside the mounting plate and the other end outside the mounting plate with a first connecting rope. The end of the first connecting rope away from the L-shaped lever passes through the inside of the mounting plate and is connected to the transmission unit. The automatic pipeline switching push block is slidably set inside the mounting plate, with one end movably connected to the L-shaped clamp rod and the other end abutting against the pipeline clamp frame.

[0011] Further specifying the above technical solution, the transmission unit includes: The drive gear is located at the bottom of the rotating rod; The transmission gear is rotatably mounted inside the mounting plate and meshes with the drive gear. A connecting rod is provided above the transmission gear. A ratchet rack, which is fitted onto a connecting rod; The ratchet is located inside the mounting plate. Its upper end is equipped with a storage rod for connecting to the first connecting rope, its lower end is rotatably connected to the bottom surface inside the mounting plate, and its side is engaged with the ratchet rack.

[0012] To further define the above technical solution, a lifting rod is slidably mounted on the ratchet rack, and the upper end of the lifting rod extends out of the mounting plate and is located outside the mounting plate.

[0013] Further defining the above technical solution, the blocking switch has an arc-shaped plate structure, and a second connecting rope is provided at the bottom of the blocking switch. The end of the second connecting rope away from the blocking switch passes through the tee pipe and connects to one side of the pipe clamp frame. A third connecting rope is provided at the top of the blocking switch, and the end of the third connecting rope away from the blocking switch connects to the other side of the pipe clamp frame.

[0014] To further refine the above technical solution, the mounting plate is provided with guide holes for guiding the second connecting rope.

[0015] To further specify the above technical solution, the aspiration syringe includes: The syringe is drawn back, with one end connected to a three-way pipe, and a first one-way valve is installed inside the end of the syringe connected to the three-way pipe. The retraction push rod is slidably connected to the other end of the retraction syringe.

[0016] To further define the above technical solution, the retraction push rod includes: The retraction push rod body has one end located inside the retraction injection cylinder and slidably connected to the retraction injection cylinder, and the other end located outside the retraction injection cylinder and connected to the quantitative retraction mechanism. The liquid collection tube is connected to the side of the return push rod body away from the return injection cylinder, and a second one-way valve is provided at the connection between the liquid collection tube and the return push rod body. Beneficial effects

[0017] I. This invention, through the combined design of a retraction component, a tubing clamp, a linkage component, and a three-way tubing, limits the movement distance of the retraction plunger in the retraction syringe during the retraction process, preventing insufficient or excessive retraction. Thus, when the doctor holds the ultrasound probe with one hand and retracts with the other, they only need to rotate the retraction component to complete the retraction operation and automatically switch the pathway in the three-way tubing. The retraction component limits the movement distance of the piston in the retraction syringe, preventing insufficient or excessive retraction. In other words, the doctor does not need to precisely control the movement distance of the piston in the retraction syringe during retraction; they only need to monitor whether liquid is being drawn out of the syringe. The operation is simple and convenient. Furthermore, the linkage component limits the single retraction volume of the retraction component. After retraction, the linkage component simultaneously drives the tubing clamp to squeeze and seal the three-way tubing and close the sealing switch, achieving automatic switching of the pathway in the three-way tubing for subsequent anesthetic injection. This simplifies the overall operation of the device and improves surgical efficiency.

[0018] Second, the quantitative backflow mechanism provided in this embodiment of the invention can drive the blocking switch to move so as to block or open the passage switching port of the three-way pipeline, which is suitable for scenarios that require multiple injections of the full dose of anesthetic.

[0019] Third, through the combined design of the second connecting rope, the third connecting rope, the pipeline clamp frame and the blocking switch, the present invention can block the passage switching port of the three-way pipeline while the blocking switch blocks the passage switching port of the three-way pipeline, and the pipeline clamp frame can further block the return passage of the three-way pipeline, thereby ensuring that the passage through which the anesthetic flows in the three-way pipeline is unobstructed and the anesthetic will not enter the return passage.

[0020] IV. This invention, through the combined design of a retraction push rod, a liquid collection tube, a first one-way valve, and a second one-way valve, can collect the extracted liquid in the retraction syringe during the retraction process. Furthermore, during the retraction and reset process of the push rod, the extracted liquid passes through the second one-way valve and enters the liquid collection tube. Thus, before administering small doses of local anesthetic in multiple injections, it is only necessary to observe the color of the liquid in the retraction syringe to determine if the anesthetic injection conditions are met. The liquid collection tube can also be replaced to collect the extracted liquid in multiple injections for later testing. The operation is simple and convenient.

[0021] V. The present invention can limit the distance of movement of the retraction push rod by setting the diameter of the retraction disc, so that the single retraction volume of the retraction syringe meets the standard requirements. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a device for nerve block drug injection that is easy for single-person operation, provided as an embodiment of the present invention. Figure 2 for Figure 1 Enlarged view of the mounting plate location; Figure 3 A schematic diagram showing the connection relationship between the mounting plate, the quantitative return mechanism, and the three-way pipeline; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Disassembly diagram of the device shown; Figure 6 for Figure 5 A schematic diagram showing the connection relationship between the mid-retraction component, the linkage component, and the pipeline clamp frame; Figure 7 for Figure 6 A schematic diagram of the device from another perspective; Figure 8 for Figure 6 A front view of the device shown; Figure 9 A schematic diagram showing the connection relationship between the pipe clamp frame and the sealing switch; Figure 10 This is a disassembled diagram of the syringe for retraction; Figure 11 for Figure 10 Left view of the device shown; Figure 12 This is a structural schematic diagram showing a partial cross-section of the mounting plate and the tee pipe. Figure 13 for Figure 12 Enlarged view of point B in the middle; Figure 14 for Figure 12 Enlarged view of point C in the middle; Figure 15 for Figure 12 Enlarged view at point D; Figure 16 This is a schematic diagram of the structure of the first check valve; Figure 17 for Figure 1 A three-dimensional diagram of the device shown; Figure 18 for Figure 12 A three-dimensional diagram of the device shown; Figure 19 for Figure 17 The diagram shows a 3D view of the device after the mounting plate has been removed.

[0024] The components include: 1. Anesthetic syringe; 2. Retractable syringe; 21. Retractable syringe barrel; 22. Retractable push rod; 22a. Retractable push rod body; 22b. Liquid collection tube; 23. First check valve; 24. Second check valve; 3. Three-way pipe; 31. Sealing switch; 32. Second connecting rope; 33. Third connecting rope; 4. Mounting plate. 5. Retraction assembly; 51. Retraction disc; 52. Mounting cylinder; 53. Mounting rod; 6. Pipe clamp frame; 61. First reset elastic element; 7. Linkage assembly; 71. Drive gear; 72. Transmission gear; 72a. Connecting rod; 73. Ratchet; 73a. Lifting rod; 74. Ratchet; 74a. Storage rod; 75. L-shaped clamp; 76. First connecting rope; 77. Automatic pipe switching push block; 78. Second reset elastic element. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] In the description of this invention, it should be understood that the terms "length direction," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features limited to "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1 This embodiment provides a device for nerve block drug delivery that is easy for a single person to operate, such as... Figures 1 to 19 As shown, it includes an anesthetic injector 1, a back-pull injector 2, a three-way tubing 3, a mounting plate 4, and a quantitative back-pull mechanism.

[0029] The anesthetic syringe 1 is an existing syringe, and this embodiment of the invention does not make any improvements to it.

[0030] The retraction syringe 2 includes a retraction syringe 21 and a retraction plunger 22.

[0031] The back-pull syringe 21 has an injection tube connector at one end, which is used to be fixedly connected to the three-way pipe 3. The other end has a circular cylindrical structure for sliding connection with the back-pull push rod 22. The injection tube connector is fixedly provided with a first one-way valve 23, so that the liquid obtained by back-pull cannot re-enter the three-way pipe 3.

[0032] The retraction push rod 22 includes a retraction push rod body 22a and a liquid collection tube 22b.

[0033] The retraction push rod body 22a includes a piston head and a push rod portion fixedly connected to the piston head; the liquid collection tube 22b is fixedly connected to the piston head through a connecting tube.

[0034] A second one-way valve 24 is fixedly installed inside the end of the connecting tube that is fixedly connected to the piston head. The direction of the second one-way valve 24 is opposite to that of the first one-way valve 23, so that the liquid in the liquid collection tube 22b cannot re-enter the interior of the back-drawing injection cylinder 21. The first one-way valve 23 and the second one-way valve 24 are existing technologies, and this embodiment of the invention does not improve upon them. Preferably, both the first one-way valve 23 and the second one-way valve 24 are one-way valves, with a conical cylindrical elastic structure having an opening at its center. When gas or fluid passes through the opening along the inner inclined surface of the conical cylindrical elastic structure, the opening is opened to allow gas or fluid to pass through. When gas or fluid passes in the opposite direction, it compresses the outer surface of the conical cylindrical elastic structure, thereby closing the opening and preventing gas or fluid from passing through.

[0035] The push rod is a straight rod structure. One end of the push rod is fixedly connected to the piston head, and the other end is provided with a strip frame, which is used to fixally connect to the quantitative aspiration mechanism. It should be noted that, in order to facilitate the doctor's observation of the color of the aspirated liquid, the aspiration syringe 21 and the liquid collection tube 22b provided in this embodiment of the invention are both made of transparent material.

[0036] The working principle of the back-pull syringe 2 provided in this embodiment of the invention is as follows: when the back-pull push rod 22 moves into the back-pull syringe 21, the first one-way valve 23 is in a closed state, the pressure inside the back-pull syringe 21 increases, thereby causing the second one-way valve 24 to be opened, and the liquid or gas in the back-pull syringe 21 enters the liquid collection tube 22b after passing through the second one-way valve 24. When the pull-back push rod 22 moves to the outside of the pull-back injection cylinder 21, the second one-way valve 24 is closed, and the first one-way valve 23 is opened under the negative pressure of the pull-back push rod 22, so that the gas or liquid in the three-way pipe 3 enters the pull-back injection cylinder 21 after passing through the first one-way valve 23. When the pull-back push rod 22 moves to the inside of the pull-back injection cylinder 21 again, the liquid or gas in the pull-back injection cylinder 21 enters the liquid collection pipe 22b after passing through the second one-way valve 24.

[0037] The three-way conduit 3 includes a three-way connector, a retraction hose, and an injection hose. Specifically, one end of the three-way connector is fixedly connected to the anesthetic syringe 1, and the other end is connected to the retraction hose. The end of the retraction hose away from the three-way connector is fixedly connected to the retraction syringe 21, and the last end of the three-way connector is fixedly connected to the injection hose. A puncture needle is fixedly installed at the end of the injection hose away from the three-way connector for puncture. In this way, two pathways are formed between the blocking switch 31, the three-way connector, the retraction hose, and the injection hose. The first pathway is the anesthetic injection pathway formed by connecting the three-way connector and the injection hose, and the second pathway is the retraction pathway formed by connecting the three-way connector and the retraction hose. The connection port between the retraction hose and the three-way connector is the pathway switching port of the three-way conduit 3.

[0038] The tee connector is made of rigid material, and a blocking switch 31 is slidably installed inside the side wall of the tee connector. The blocking switch 31 is flush with the inner wall of the tee connector, and the blocking switch 31 can slide up and down to open or close the passage switching port.

[0039] Specifically, the blocking switch 31 has an arc-shaped plate structure. The lower end of the blocking switch 31 is fixedly equipped with a second connecting rope 32, and the upper end is fixedly connected with a third connecting rope 33. The second connecting rope 32 and the third connecting rope 33 are both connected to the quantitative backflow mechanism after passing through the tee connector or by using a buckle, so that the second connecting rope 32 and the third connecting rope 33 can be removed and discarded after use.

[0040] When the blocking switch 31 blocks the connection between the three-way connector and the aspiration hose, i.e. the passage switching port, the anesthetic injection passage is connected and the aspiration passage is closed. At this time, the doctor can push the anesthetic syringe 1 to inject the anesthetic without performing the aspiration operation. When the blocking switch 31 moves upward, it no longer blocks the passage switching port. At this time, the anesthetic injection passage is closed and the aspiration passage is connected. The doctor can use the quantitative aspiration mechanism to drive the aspiration push rod 22 to move, that is, to perform the aspiration operation without anesthetic injection.

[0041] The mounting plate 4 has a plate-like structure, and an elastic buckle is fixedly installed on the mounting plate 4. The elastic buckle is used for detachable connection with the aspirating syringe 21. Specifically, the mounting plate 4 is made of rigid material, preferably medical plastic. In this embodiment of the invention, the fixing connection method between the mounting plate 4 and the elastic buckle is not specified; for example, the fixing connection method is a bolt connection.

[0042] The quantitative backflow mechanism is fixedly mounted on the mounting plate 4 and includes a backflow component 5, a pipeline clamp frame 6, and a linkage component 7.

[0043] The aspiration assembly 5 includes a aspiration disc 51, a mounting cylinder 52, and a mounting rod 53. Specifically, the upper end of the aspiration disc 51 is fixedly provided with the mounting cylinder 52 and multiple levers that facilitate the doctor's rotation of the aspiration disc 51. The mounting cylinder 52 and each lever are arranged circumferentially. The mounting cylinder 52 is threadedly connected to the mounting rod 53, and the lower end of the mounting cylinder 52 is fixedly provided with a rotating rod, which is rotatably connected to the mounting plate 4.

[0044] In actual use, the mounting rod 53 passes through the pusher frame in the retraction pusher body 22a and is threadedly connected to the mounting cylinder 52 to fix the end of the retraction pusher 22. This allows the mounting rod 53 to slide within the pusher frame of the retraction pusher body 22a. Initially, the mounting rod 53 is located on the side closest to the retraction syringe 21. When the doctor manually rotates the retraction disc 51 half a turn, the mounting rod 53 moves the retraction pusher 22 outward, completing the retraction. When the doctor continues to manually rotate the retraction disc 51 half a turn, the mounting rod 53 moves the retraction pusher 22 back to its initial position.

[0045] In practical applications, the distance that the pull-back push rod 22 moves during pull-back can be limited by setting the diameter of the pull-back disc 51, so that after the pull-back disc 51 rotates half a turn, the pull-back volume of the pull-back syringe 2 meets the pull-back requirements. Preferably, the single pull-back volume of the pull-back syringe 2 is between 2ml and 3ml.

[0046] The pipe clamp frame 6 includes three strip rods and one semi-circular rod. The ends of the three strip rods and the semi-circular rod are sequentially fixedly connected to form a square frame structure. A square guide block is fixedly installed on one of the vertically positioned strip rods inside the mounting plate 4. The directional guide block is used to guide the pipe clamp frame 6, allowing it to move linearly within the mounting plate 4. Specifically, the pipe clamp frame 6 is slidably connected to the mounting plate 4, and a first return spring 61 is fixedly connected to one end of the pipe clamp frame 6 that is slidably connected to the mounting plate 4. The end of the first return spring 61 away from the pipe clamp frame 6 is fixedly connected to the mounting plate 4. The end of the second connecting rope 32 away from the sealing switch 31 is detachably connected to the bottom end of the pipe clamp frame 6, and the third connecting rope 33 is detachably connected to the upper end of the pipe clamp frame 6.

[0047] In practical applications, to prevent the second connecting rope 32 and the third connecting rope 33 from tilting and hindering the smooth up-and-down movement of the sealing switch 31, two guide holes are provided on the mounting plate 4, positioned vertically. These holes allow the second connecting rope 32 and the third connecting rope 33 to pass through and be detachably connected to the pipe clamp frame 6. This allows the second connecting rope 32 and the third connecting rope 33 to move axially along the tee connector, ensuring the sealing switch 31 slides smoothly up and down inside the tee connector. Each of the second connecting rope 32 and the third connecting rope 33 has a slidably fitted sealing sleeve, which is fixedly connected to the outer surface of the tee connector in the tee pipe 3. This prevents leakage of the re-drawn liquid and ensures the sealing of the tee pipe 3. Preferably, the sealing sleeve is an elastic silicone plug.

[0048] The linkage component 7 includes a transmission unit, an L-shaped locking rod 75, a first connecting rope 76, an automatic pipeline switching push rod 77, and a second reset elastic element 78.

[0049] Specifically, the transmission unit includes a drive gear 71, a transmission gear 72, a ratchet rack 73, and a ratchet gear 74.

[0050] The drive gear 71 is fixedly mounted at the end of the rotating rod at the bottom of the retracting disc 51.

[0051] The transmission gear 72 is rotatably disposed inside the mounting plate 4 and meshes with the drive gear 71. A connecting rod 72a is fixedly disposed at the upper end of the transmission gear 72. The connecting rod 72a is eccentrically disposed and is used to slide and engage with the ratchet rack 73. Thus, when the transmission gear 72 rotates, the connecting rod 72a rotates around the center of the transmission gear 72, thereby driving the ratchet rack 73 to move linearly back and forth.

[0052] The ratchet 73 is laterally slidably disposed inside the mounting plate 4. Specifically, the ratchet 73 is a long strip structure, with one end disposed on the ratchet and the other end slidably connected to the connecting rod 72a, so that it can slide laterally inside the mounting plate 4 under the drive of the connecting rod 72a.

[0053] A lifting rod 73a is slidably connected above the ratchet rack 73. The lifting rod 73a is perpendicular to the ratchet rack 73, and its upper end protrudes from the mounting plate 4 and is positioned above the mounting plate 4. This allows the ratchet rack 73 to slide longitudinally within the mounting plate 4 only under external force. Specifically, the lifting rod 73a has a T-shaped rod structure, and a friction layer (not shown in the figure) is fixedly connected to its outer surface. Friction exists between the friction layer and the mounting plate 4, and the longitudinal position of the lifting rod 73a is fixed by the friction between the friction layer and the mounting plate 4. Preferably, the friction layer is a medical-grade silicone particle layer. It should be noted that the embodiment of the present invention does not limit the fixing connection method between the ratchet rack 73 and the friction layer. For example, the fixing connection method is a screw or a snap-fit ​​connection.

[0054] Correspondingly, the mounting plate 4 has a groove inside that facilitates the linear reciprocating movement of the ratchet 73, and the height of the groove is greater than the sum of the thicknesses of the ratchet 73 and the ratchet gear 74, so that the ratchet 73 can engage or disengage with the ratchet gear 74 as it moves up and down with the lifting rod 73a.

[0055] The ratchet 74 is rotatably disposed inside the mounting plate 4 and meshes with the ratchet rack 73. A storage rod 74a is fixedly disposed on the upper end of the ratchet 74. The side of the storage rod 74a is fixedly connected to the end of the first connecting rope 76. The end of the first connecting rope 76 away from the storage rod 74a passes through the mounting plate 4 and is fixedly connected to the L-shaped locking rod 75.

[0056] One end of the L-shaped lever 75 is located on the outside of the mounting plate 4, and the other end passes through the interior of the mounting plate 4 and is inserted into the automatic pipeline switching push rod 77 to fix the position of the automatic pipeline switching push rod 77. Specifically, a friction block (not shown in the figure) is fixedly provided on the end of the L-shaped lever 75 that is inserted into the automatic pipeline switching push rod 77. The friction head is in frictional connection with the automatic pipeline switching push rod 77, so that the L-shaped lever 75 can only move under the action of external force.

[0057] The automatic pipeline switching push rod 77 is a square block structure with a chamfer at one end and a groove at the other end. Specifically, the chamfered end of the automatic pipeline switching push rod 77 is located near the pipeline clamp frame 6, and the grooved end of the automatic pipeline switching push rod 77 is fixedly connected to the second reset elastic member 78. The end of the second reset elastic member 78 away from the automatic pipeline switching push rod 77 is fixedly connected to the mounting plate 4. A push rod is fixedly installed on the top surface of the automatic pipeline switching push rod 77. The end of the push rod away from the automatic pipeline switching push rod 77 passes through the mounting plate 4 and is located on the outside of the mounting plate 4. Correspondingly, a strip groove is provided on the mounting plate 4 to facilitate the sliding of the push rod.

[0058] In practical applications, when the drive gear 71 rotates one revolution, the transmission gear 72 rotates two revolutions. The transmission gear 72 drives the ratchet rack 73 to move laterally back and forth twice. The ratchet rack 73 drives the ratchet 74 to rotate twice. The ratchet 74 rotates half a revolution each time. After the ratchet 74 rotates twice, the first connecting rope 76 wraps around the storage rod 74a once. At this time, as the first connecting rope 76 wraps around the storage rod 74a, the L-shaped locking rod 75 moves to the outside of the mounting plate 4 along with the first connecting rope 76 until the L-shaped locking rod 75 separates from the automatic switching push rod 77. Then, the automatic switching push rod 77, under the push of the second reset elastic element 78, pushes the pipeline clamp 6 to the innermost part of the mounting plate 4. At this time, the second connecting rope 32 enters the interior of the mounting plate 4 along with the pipeline clamp 6. The blocking switch 31 moves downward under the pull of the second connecting rope 32 until the passage switching port is completely blocked.

[0059] The working principle of the quantitative back-drawing mechanism provided in this embodiment of the invention is as follows: The doctor holds the ultrasound probe with one hand, and after the ultrasound positions the needle tip, the doctor manually rotates the aspiration disc 51 half a turn with the other hand. The mounting rod 53 rotates half a turn with the aspiration disc 51. At this time, the aspiration push rod 22 moves to the outside of the aspiration syringe 21, thus completing a single aspiration operation. At this time, the doctor can determine whether the conditions for anesthetic injection are met by observing whether there is liquid in the aspiration syringe 21 and combining it with the puncture site. When the conditions for anesthetic injection are not met: The doctor continues to manually rotate the aspiration disc 51 half a turn, and the mounting rod 53 drives the aspiration push rod 22 to move into the aspiration syringe 21 until the aspiration push rod 22 returns to its initial position. During this process, the first one-way valve 23 is closed, and the pressure inside the aspiration syringe 21 increases, which causes the second one-way valve 24 to open. The liquid or gas in the aspiration syringe 21 enters the liquid collection tube 22b after passing through the second one-way valve 24. Then, the doctor adjusts the position of the puncture needle and aspirates again. If the conditions for anesthetic injection are met, the above steps are performed. If the conditions for anesthetic injection are not met, the puncture point needs to be reselected.

[0060] When the conditions for anesthetic injection are met: The doctor continues to manually rotate the aspiration disc 51 half a turn, and the mounting rod 53 drives the aspiration push rod 22 to move into the aspiration syringe 21 until the aspiration push rod 22 returns to the initial position. During this process, the first one-way valve 23 is closed, and the pressure inside the aspiration syringe 21 increases, which causes the second one-way valve 24 to be opened. The liquid or gas in the aspiration syringe 21 enters the liquid collection tube 22b after passing through the second one-way valve 24. During the above process, the drive gear 71 rotates once with the retracting disc 51. Since the outer diameter of the transmission gear 72 is smaller than the transmission ratio of the drive gear 71, the drive gear 71 rotates once and the transmission gear 72 rotates twice. The transmission gear 72 drives the ratchet rack 73 to move laterally back and forth twice inside the mounting plate 4. During the back and forth movement of the ratchet rack 73, it drives the ratchet 74 to rotate clockwise. The clockwise rotation of the ratchet 74 wraps and stores the first connecting rope 76 once. The first connecting rope 76 drives the L-shaped clamp 75 to move to the outside of the mounting plate 4 until the L-shaped clamp 75 separates from the automatic pipeline switching push block 77 so as to release the automatic pipeline switching push block 77. After the automatic switching push block 77 is released, the second reset elastic element 78 is no longer squeezed and returns to its natural state. The second reset elastic element 78 drives the automatic switching push block 77 to move towards the side closer to the pipeline clamp frame 61 until the chamfered part of the automatic switching push block 77 penetrates into the interior of the pipeline clamp frame 6. Under the push of the chamfered slope, the pipeline clamp frame 6 enters the interior of the mounting plate 4. At this time, the pipeline clamp frame 6 squeezes and seals the return hose in the tee pipeline 3. At the same time, the pipeline clamp frame 6 drives the second connecting rope 32 to move to the outside of the tee pipeline 3, so that the sealing switch moves downward to seal the end of the connection between the tee connector and the return pipeline. At this time, the anesthetic injection passage is connected and the return passage is closed. The doctor can push the anesthetic syringe 1 to perform anesthetic injection. After a single anesthetic injection, the doctor first pulls the lever 73a upwards to its highest point with one hand. At this point, the lever 73a moves the ratchet 73 upwards, causing the ratchet 73 to disengage from the ratchet gear 74. The lever 73a is then fixed in position by the friction layer. Next, the doctor pushes the automatic tubing switching push block 77 back to its initial position with one thumb until the push rod on the automatic tubing switching push block 77 is at the end of the slide closest to the retracting syringe 2. At this point, the automatic tubing switching push block 77 automatically aligns with the L-shaped locking lever 75. Then, the doctor moves the L-shaped locking lever 75 into the mounting plate with one index finger until it engages with the automatic tubing switching push block 77. At this point, the first connecting rope 76 is released from the storage rod 74a by the L-shaped locking lever 75, causing both the first connecting rope 76 and the ratchet gear 74 to return to their initial state. Since the L-shaped lever 75 has a friction block at one end inside the mounting plate 4, after the doctor releases the L-shaped lever 75 with his index finger, the end of the L-shaped lever 75 with the friction block is fixed to the automatic tube switching push block 77 under the action of friction. Finally, the doctor releases the automatic switching push block 77 and presses the lifting rod 73a down, so that the lifting rod 73a returns to its initial position. At this time, the ratchet rack 73 re-engages with the ratchet gear 74 so that it can be pulled back again after the anesthetic injection is completed, so that it can be pulled back before the next anesthetic injection. During the process of the doctor pushing the automatic tube switching pusher 77 to the initial position with one thumb, the third connecting rope 33 drives the sealing switch 31 and the second connecting rope 32 back to the initial position. Throughout the process, the second connecting rope 32 and the third connecting rope 33 are always in a stretched state.

[0061] It should be noted that the three-way tubing 3, anesthetic syringe 1, aspiration syringe 2, second connecting rope 32 and third connecting rope 33 provided in the embodiments of the present invention are disposable structures and must be discarded after use. The mounting plate 4 and the components set on the mounting plate 4 can be disinfected and reused.

[0062] Application Cases Mr. Liu, after a right posterior lobe resection of the liver, is scheduled to undergo ultrasound-guided transverse abdominis muscle block. Local anesthetic will be injected in sufficient quantities at four points, with 5ml of local anesthetic solution injected at each point. The specific procedures are as follows: S1: Preoperative preparation: After completing the preparation of drugs and equipment, an ultrasound scan is performed in the mid-axillary line, iliac crest and costal margin area to determine the transverse abdominis blockade assessment level (TAP) and clarify the muscle layer to which the local anesthetic drug is injected. S2: Perform a right upper transverse abdominis block. The specific procedure is as follows: S201: Re-ultrasound localization: Place the ultrasound probe on the body surface at the preset marked site to clearly identify the three layers of abdominal wall muscle structure, explore whether there are obvious blood vessels in the target TAP space, and avoid the risk of puncture damage. S202: Standardized puncture and needle insertion: The needle is slowly inserted under real-time ultrasound visualization guidance to ensure that the needle tip is always within the ultrasound field of view until the needle tip accurately reaches the transverse abdominis muscle plane between the internal oblique muscle and the transverse abdominis muscle. S203: Perform the puncture and aspiration procedure, as detailed below; The operator holds the ultrasound probe in place with one hand to determine the direction of the puncture needle, and manually rotates the aspiration disc 51 half a turn with the other hand. The aspiration disc 51 moves the aspiration push rod 22 outward from the aspiration syringe 21 via the mounting rod 53, thus completing a single aspiration operation. In this step, the aspiration push rod 22 moves 1 mm, corresponding to an aspiration volume of 0.3 ml. After the aspiration disc 51 moves half a turn, the total aspiration volume of the aspiration syringe 21 in a single operation is 3 ml. S204: When the doctor observes that the aspirated material in the aspirating syringe 21 is air or a small amount of clear tissue fluid, the doctor continues to manually rotate the aspirating disc 51 half a turn. The mounting rod 53 drives the aspirating push rod 22 to move into the aspirating syringe 21 until the aspirating push rod 22 returns to its initial position. During this process, the first one-way valve 23 is closed, and the pressure inside the aspirating syringe 21 increases, thereby opening the second one-way valve 24. The liquid or gas in the aspirating syringe 21 enters the liquid collection tube 22b after passing through the second one-way valve 24. During the above process, the drive gear 71 releases the automatic switching push block 77 through the transmission assembly, L-shaped lever 75 and first connecting rope 76. Under the push of the chamfered surface of the automatic switching push block 77, the pipe clamp frame 6 enters the mounting plate 4. At this time, the pipe clamp frame 6 squeezes and blocks the return hose in the tee pipe 3. At the same time, the pipe clamp frame 6 drives the second connecting rope 32 to move to the outside of the tee pipe 3, so that the sealing switch moves downward to block the end of the connection between the tee connector and the return pipe. At this time, the anesthetic injection passage is connected and the return passage is closed. S205: The operator can push the anesthetic syringe 1 to inject 5ml of local anesthetic solution. If the solution spreads in a spindle or elliptical shape in the plane of the transverse abdominis muscle, it can be confirmed that the puncture needle tip is in the target TAP gap. S206: Switch the passage of the three-way tube 3 to open the aspiration passage and close the injection passage at the same time; First, the operator pulls the lifting lever 73a upward to the highest point with one hand. At this time, the lifting lever 73a drives the ratchet rack 73 to move upward in sync, so that the ratchet rack 73 is no longer engaged with the ratchet gear 74. Then, the operator pushes the automatic tube switching push block 77 to the initial position with one hand until the push rod on the automatic tube switching push block is at the end of the slide groove. At this time, the through hole on the side of the automatic tube switching push block 77 is automatically aligned with the L-shaped locking rod 75. Then, the doctor fixes the position of the automatic switching push block 77 with his thumb and moves the L-shaped locking rod 75 into the mounting plate with his index finger until the L-shaped locking rod 75 is engaged with the automatic tube switching push block 77. At this time, the first connecting rope 76 and the ratchet 74 return to the initial state. Secondly, the operator releases the automatic switching push block 77 and the L-shaped lever 75; Finally, after releasing the automatic switching push block 77 and the L-shaped latch 75, the operator presses the lifting rod 73a down to return it to its initial position. At this time, the ratchet rack 73 re-engages with the ratchet gear 74. During the process of the operator pushing the automatic pipeline switching push block 77 to the initial position with one hand, the third connecting rope 33 drives the sealing switch 31 and the second connecting rope 32 back to the initial position. Throughout the process, the second connecting rope 32 and the third connecting rope 33 are always in a stretched state. At this time, the pull-back passage is opened and the injection passage is closed. S207: Separate steps S203 to S206 to inject 5ml of local anesthetic solution four times in total, completing the full dose of anesthetic in multiple injections; S3: Remove the needle; S4: Left TAP blockade, the specific operation is the same as step S2, and will not be repeated here; S5: Confirm and monitor after operation.

[0063] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A device for administering nerve block medication that is easy for single-person operation, comprising an anesthetic injector (1) and a retraction injector (2), characterized in that, Also includes: The three-way tubing (3) is connected to the anesthetic syringe (1), the aspiration syringe (2) and the injection needle respectively, and the three-way tubing (3) is provided with a blocking switch (31) for controlling the connection of the aspiration syringe (2). Mounting plate (4) is detachably connected to the back-pull syringe (2); The quantitative back-pull mechanism is installed on the mounting plate (4) and is connected to both the blocking switch (31) and the back-pull syringe (2). It is used to limit the total amount of back-pull in a single operation of the back-pull syringe (2) and automatically close the blocking switch (31) after the back-pull is completed.

2. The device for nerve block drug injection that is easy for single-person operation according to claim 1, characterized in that, The quantitative retrieval mechanism includes: The retraction assembly (5) has one end located above the mounting plate (4) and connected to the retraction syringe (2), and the other end is rotatably connected to the mounting plate (4); The pipe clamp (6) has one end located outside the mounting plate (4) and connected to one end of the tee pipe (3) and the return syringe (2), and the other end is slidably connected to the mounting plate (4); The linkage component (7) is located inside the mounting plate (4), with one end abutting against the pipe clamp frame (6) and the other end connected to the pullback component (5).

3. The device for nerve block drug injection that is easy for single-person operation according to claim 2, characterized in that, The pullback component (5) includes: The retractable disc (51) has an installation cylinder (52) on its upper surface and a rotating rod at its bottom, which is rotatably connected to the installation plate (4). The mounting rod (53) passes through the retraction syringe (2) and is connected to the mounting tube (52).

4. The device for nerve block drug injection that is easy for single-person operation according to claim 3, characterized in that, The linkage component (7) includes: The transmission unit is located inside the mounting plate (4), and one end is connected to the bottom end of the rotating rod; The L-shaped lever (75) has one end inside the mounting plate (4) and the other end outside the mounting plate (4) and is provided with a first connecting rope (76). The end of the first connecting rope (76) away from the L-shaped lever (75) passes into the mounting plate (4) and is connected to the transmission unit. The pipeline automatic switching push block (77) is slidably set inside the mounting plate (4), with one end connected to the L-shaped clamp rod (75) and the other end abutting against the pipeline clamp frame (6).

5. The device for nerve block drug injection that is easy for single-person operation according to claim 4, characterized in that, The transmission unit includes: A drive gear (71) is located at the bottom of the rotating rod; The transmission gear (72) is rotatably disposed inside the mounting plate (4) and meshes with the drive gear (71). A connecting rod (72a) is provided above the transmission gear (72). A ratchet rack (73) is sleeved with a connecting rod (72a); The ratchet (74) is located inside the mounting plate (4). Its upper end is provided with a storage rod (74a) for connecting with the first connecting rope (76), its lower end is rotatably connected to the bottom surface inside the mounting plate (4), and its side is meshed with the ratchet rack (73).

6. The device for nerve block drug injection that is easy for single-person operation according to claim 5, characterized in that, A lifting rod (73a) is slidably mounted on the ratchet (73). The upper end of the lifting rod (73a) passes through the mounting plate (4) and is located outside the mounting plate (4).

7. The device for nerve block drug injection that is easy for single-person operation according to claim 2, characterized in that, The blocking switch (31) has an arc-shaped plate structure, and a second connecting rope (32) is provided at the bottom of the blocking switch (31). The end of the second connecting rope (32) away from the blocking switch (31) passes through the tee pipe (3) and is connected to one side of the pipe clamp frame (6). A third connecting rope (33) is provided at the upper end of the blocking switch (31). The end of the third connecting rope (33) away from the blocking switch (31) is connected to the other side of the pipe clamp frame (6).

8. A device for nerve block drug injection that is easy for single-person operation according to claim 6, characterized in that, The mounting plate (4) is provided with a guide hole for guiding the second connecting rope (32).

9. A device for nerve block drug injection that is easy for single-person operation according to claim 1, characterized in that, The aspiration syringe (2) includes: The syringe (21) is pulled back, one end of which is connected to the three-way pipe (3), and the end of the syringe (21) connected to the three-way pipe (3) is equipped with a first one-way valve (23). The retraction push rod (22) is slidably connected to the other end of the retraction syringe (21).

10. A device for nerve block drug injection that is easy for single-person operation according to claim 9, characterized in that, The pullback push rod (22) includes: The retraction push rod body (22a) has one end located inside the retraction injection cylinder (21) and slidably connected to the retraction injection cylinder (21), and the other end located outside the retraction injection cylinder (21) and connected to the quantitative retraction mechanism. The liquid collection tube (22b) is connected to the side of the return push rod body (22a) away from the return injection cylinder (21), and a second one-way valve (24) is provided at the connection between the liquid collection tube (22b) and the return push rod body (22a).

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