A nerve block puncture injection system

Abstract

The application relates to a nerve block puncture medicine injection system and belongs to the technical field of medical equipment. In view of the low puncture efficiency of a puncture injection device in the prior art, the puncture medicine injection system comprises a hand-held device, a puncture inner tube, a front end provided with an injection hole, a rear end communicated with a medicine liquid cylinder and used for conveying medicine liquid, a puncture outer tube, a front end provided with a first backflow hole, sleeved at the front end of the puncture inner tube, a puncture needle formed by the puncture inner tube and the puncture outer tube and a backflow channel formed by the outer periphery of the puncture inner tube and the puncture outer tube, a puncture module located at the outer periphery of the puncture inner tube and used for controlling the extension length of the puncture inner tube and the puncture outer tube, and a backflow module located at the front end of the puncture outer tube, communicated with the backflow channel and used for backflow and storage of liquid at a puncture position. The puncture module independently controls the extension length of the puncture needle, the backflow module can instantly suck tissue fluid in situ without moving the needle tip, the needle tip is quickly verified whether to be misentered into a blood vessel or an abnormal position, precision medicine injection is ensured, equipment replacement is avoided, and the nerve block puncture efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to a nerve block puncture and drug delivery system, belonging to the field of medical device technology. Background Technology

[0002] Nerve block, a core technique in regional anesthesia, involves precisely injecting local anesthetic drugs around nerve trunks, plexuses, or ganglia to block nerve impulse transmission and achieve analgesia or anesthesia in the target area. It is widely used in clinical settings such as surgical anesthesia, postoperative pain management, and chronic pain treatment. However, current nerve block puncture and drug injection procedures face multiple technical bottlenecks, severely limiting their safety and efficiency.

[0003] Clinically used nerve block puncture and injection devices consist of separate components such as a puncture needle, syringe, and connecting tubing. Physicians must repeatedly assemble and disassemble these components during the procedure. This process not only prolongs surgical preparation time but also easily disrupts the sterile environment, increasing the risk of infection and the probability of operational errors. Controlling the puncture depth relies entirely on the physician's subjective experience, such as visual estimation of anatomical landmarks or tactile judgment of needle tip resistance. The lack of an objective, real-time depth monitoring mechanism means that excessively deep punctures may cause nerve damage, hematoma, or vascular puncture, while insufficient punctures fail to reach the effective anesthesia area, directly affecting the treatment outcome. In confirming the puncture location, manual aspiration is routinely used, involving pulling the syringe plunger to observe blood flow to determine if blood has been mistakenly injected into a blood vessel. However, this method is highly dependent on the physician's skill and immediate judgment. Furthermore, if the needle position needs to be adjusted after a single aspiration, the syringe or connecting tubing must be replaced. This not only disrupts the continuity of the procedure but also increases the consumption of medical consumables and the complexity of the operation, significantly reducing puncture efficiency and increasing patient risk. Summary of the Invention

[0004] This application provides a nerve block puncture and drug injection system designed to improve the efficiency of nerve block puncture.

[0005] A nerve block puncture and drug delivery system includes a handheld device and further comprises: an inner puncture tube with an injection port at its front end and a rear end connected to a drug delivery cylinder for delivering drug; an outer puncture tube with a first aspiration port at its front end, fitted onto the front end of the inner puncture tube to form a puncture needle with the inner puncture tube and forming a aspiration channel around the outer periphery of the inner puncture tube; a puncture module located around the outer periphery of the inner puncture tube for controlling the extension length of the inner and outer puncture tubes; and an aspiration module located at the front end of the outer puncture tube and connected to the aspiration channel for aspirating and storing fluid at the puncture site.

[0006] Through the above technical solution, the inner and outer puncture cannulas are connected to form a puncture needle, and its extension length is independently controlled by the puncture module, achieving precise adjustment and positioning of the puncture depth and preventing cross-contamination between the medication and the aspirated fluid. The aspirated channel, in conjunction with the front-end aspirated module, can immediately aspirate tissue fluid in situ without moving the needle tip, quickly verifying whether the needle tip has accidentally entered a blood vessel or abnormal site, greatly improving operational safety. This integrated design integrates puncture, safety verification, and medication administration functions into a handheld device, simplifying the operation steps, avoiding instrument replacement, and significantly improving the efficiency of nerve block puncture while ensuring accurate drug administration.

[0007] In some embodiments, the puncture module includes: a puncture needle driving assembly, sleeved on the outer periphery of the puncture needle, for driving the puncture needle to reciprocate along the front-to-back puncture direction; and a puncture length measuring assembly, for determining the puncture depth of the puncture needle.

[0008] Through the above technical solution, the puncture needle drive component provides a stable and controllable puncture force for the puncture needle, while the puncture length measurement component provides accurate depth information, enabling the operator to accurately inject the drug solution to the predetermined depth according to the anatomical location of the target nerve, effectively avoiding damage to surrounding tissues and improving the efficiency of nerve block puncture.

[0009] In some embodiments, the puncture length measuring component includes: a magnetic rod, evenly spaced along the puncture direction on the outside of the handheld device, having an N / S pole self-locking distribution; and a magnetic block, located on the outer periphery of the puncture needle, which, when moved, pushes the corresponding magnetic rod to rotate 180° to determine the puncture depth of the puncture needle.

[0010] Through the above technical solution, the flipping state of the magnetic rod can clearly indicate the current depth of the puncture needle. Without the need for complex readings or electronic displays, the puncture depth can be quickly determined visually, improving the convenience and safety of the operation. The self-locking distribution of the N and S poles ensures that the magnetic rod can stably maintain its state after flipping, avoiding misreading or rebound, thereby improving the reliability of the measurement.

[0011] In some embodiments, the puncture needle drive assembly includes: a gear set located at the rear end of the retraction sleeve, sleeved on the outer periphery of the puncture inner tube and threadedly connected to the puncture inner tube; and a rotation drive member with its fixed end located inside the handheld device, used to drive the gear set to rotate so as to drive the puncture needle to reciprocate along the puncture direction.

[0012] In some embodiments, the aspiration module includes: a aspiration sleeve, sleeved around the puncture needle and slidably connected to the inner wall of the aspiration sleeve, with its front end extending out of the handheld device; a aspiration baffle, sleeved around the puncture needle, with its front side forming a pressure regulating cavity between the aspiration sleeve and the puncture outer tube; and a retraction baffle, sleeved around the puncture needle, with its front side forming a aspiration cavity between the aspiration baffle and the aspiration sleeve, the aspiration cavity communicating with the aspiration channel.

[0013] The above technical solution allows for the adjustment of the pressure in the aspiration chamber by changing the volume of the pressure regulating chamber through the movable aspiration baffle. This enables the aspiration fluid to enter the aspiration chamber. The aspiration chamber and the puncture needle are set up independently, and different channels are used between the aspiration fluid and the medication, preventing cross-contamination between the medication and the aspiration fluid and further improving the puncture effect.

[0014] In some embodiments, a second aspiration hole is provided on the puncture outer tube for connecting the aspiration chamber and the aspiration channel. The aspiration chamber is provided with an aspiration fluid control component. The aspiration fluid control component includes: a sleeve, sleeved on the outside of the puncture outer tube, for opening or closing the second aspiration hole; and an elastic element, one end of which is connected to the recovery baffle and the other end of which is connected to the sleeve, for driving the sleeve to move along the axial direction of the puncture needle to control the opening and closing state of the second aspiration hole.

[0015] By employing the aforementioned technical solution, a second aspiration port is installed on the puncture catheter, and the sleeve and elastic element in the aspiration fluid control assembly are used to achieve precise and controllable management of the fluid communication between the aspiration chamber and the aspiration channel. Medical personnel can open or close the second aspiration port at any time according to the puncture procedure, thereby effectively controlling the fluid aspiration process.

[0016] In some embodiments, a recovery chamber is formed between the rear side of the retraction baffle and the retraction sleeve, and the recovery chamber and the retraction chamber are connected by a one-way valve for recovering fluid from the puncture site.

[0017] The above technical solution forms an independent recovery chamber between the back side of the return baffle and the return sleeve, which avoids secondary contact between the return fluid and the return channel or the external environment, does not affect the secondary return operation of medical staff, and the secondary recovery fluid can also be stored in the recovery chamber, which improves the accuracy and safety of the nerve block puncture and drug injection system in terms of fluid management.

[0018] In some embodiments, a pressure regulating module is also provided, the pressure regulating module comprising: an air pump located inside the handheld device for regulating the pressure in the liquid cylinder and the pressure regulating chamber; an injection tube, one end of which is connected to the first output port of the air pump and the other end of which is connected to the liquid cylinder; and a return tube, one end of which is connected to the second output port of the air pump and the other end of which is connected to the pressure regulating chamber.

[0019] In some embodiments, a reflux module is also provided, the reflux module comprising: a reflux tube, sleeved on the outer periphery of the puncture inner tube, the front end of which abuts against the rear side of the recovery baffle, and forming a reflux cavity with the outer periphery of the puncture inner tube; a reflux hole, formed on the puncture inner tube, for connecting the reflux cavity and the puncture inner tube; and a pressure detector, disposed in the reflux cavity, for detecting the pressure in the reflux cavity.

[0020] With the above technical solution, when the injection pressure of the drug solution is too high, the drug solution enters the reflux chamber through the reflux hole, and the pressure in the reflux chamber increases accordingly. When the pressure detector detects that the pressure in the reflux chamber has increased, the pressure of the injected drug solution is adjusted by the air pump to reduce the injection speed, effectively regulating the pressure of the liquid in the puncture tube, avoiding local high pressure during the injection process, thereby reducing the risk of tissue damage.

[0021] The beneficial effects of this invention are as follows: by using a handheld device, an inner puncture tube, an outer puncture tube, a puncture module, and a withdrawal module, an integrated design is achieved, reducing the assembly and disassembly steps during operation, improving the objectivity of puncture depth control and the continuity of withdrawal operation, and has the advantages of simplifying the operation process, improving the accuracy of puncture depth control, improving withdrawal efficiency, and reducing the risk of infection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure in the initial state of an embodiment of this application.

[0023] Figure 2 This is a cross-sectional view of the overall structure in the puncture state according to an embodiment of this application.

[0024] Figure 3 This is a cross-sectional view of the overall structure in the initial state of an embodiment of this application.

[0025] Figure 4 This is a cross-sectional view of the overall structure in the puncture and aspiration state of an embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the shell structure according to an embodiment of this application.

[0027] Figure 6 This is a cross-sectional view of the vertical surface of the housing in an embodiment of this application.

[0028] Figure 7 This is a schematic diagram of the puncture needle in an embodiment of this application.

[0029] Figure 8 This is a cross-sectional view of the puncture needle in an embodiment of this application.

[0030] Figure 9 This is a schematic diagram of the puncture length measuring component according to an embodiment of this application.

[0031] Figure 10This is a cross-sectional view of the puncture length measuring component according to an embodiment of this application.

[0032] Figure 11 This is a cross-sectional view of the puncture needle drive assembly according to an embodiment of this application.

[0033] Figure 12 Figure 3 An enlarged schematic diagram of part A in the middle.

[0034] Figure 13 Figure 4 Enlarged diagram of part B.

[0035] Figure 14 This is a schematic diagram of the overall structure from another perspective of the initial state of an embodiment of this application.

[0036] Figure 15 This is a horizontal cross-sectional view of the housing in an embodiment of this application.

[0037] The labels in the attached diagram are as follows: 1. Handheld device; 11. Upper pressure cap; 12. Housing; 121. First mounting groove; 122. Measuring groove; 123. Air hole; 124. Slide rail; 125. Drive chamber; 13. Handheld rod; 131. Groove; 14. Medication cylinder; 141. Injection channel; 15. Piston; 16. Control button; 2. Puncture needle; 21. Inner puncture tube; 211. Return tube; 212. Return hole; 22. Outer puncture tube; 221. First withdrawal hole; 222, inclined plate; 223, second withdrawal hole; 23, withdrawal channel; 3, puncture needle drive assembly; 31, gear set; 311, driving wheel; 312, driven wheel; 32, rotary drive component; 4, magnetic rod; 5, magnetic block; 6, withdrawal sleeve; 7, withdrawal baffle; 71, sleeve; 72, elastic component; 8, recovery baffle; 81, recovery hole; 82, one-way valve; 91, air pump; 92, injection tube; 93, withdrawal tube. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] When describing positional relationships, unless otherwise specified, when an element, such as a layer, film, or substrate, is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more intermediate elements present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more intermediate elements present.

[0041] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0042] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0043] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0044] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0045] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0046] Embodiments of this application provide a nerve block puncture and drug delivery system, such as... Figure 1-15As shown, the device includes a handheld device 1, an inner puncture tube 21, an outer puncture tube 22, a puncture module, and a withdrawal module. The inner puncture tube 21 has an injection hole at its front end and is connected to the drug reservoir 14 at its rear end for delivering drug solution. The outer puncture tube 22 has a first withdrawal hole 221 at its front end and is fitted onto the front end of the inner puncture tube 21, forming a puncture needle 2 with the inner puncture tube 21 and a withdrawal channel 23 around the outer periphery of the inner puncture tube 21. The puncture module is located around the outer periphery of the inner puncture tube 21 and is used to control the extension length of the inner puncture tube 21 and the outer puncture tube 22. The withdrawal module is located at the front end of the outer puncture tube 22 and is connected to the withdrawal channel 23 for withdrawing and storing the fluid at the puncture site.

[0047] Reference Figure 1 and Figure 2 The handheld device 1 includes, from top to bottom, an upper pressure cover 11, a housing 12, and a handheld rod 13. The upper pressure cover 11 is snapped into the top of the housing 12. The handheld rod 13 is vertically arranged and its top end is fixedly connected to the bottom of the housing 12. The front side of the handheld rod 13 has multiple grooves 131 that are adapted to the fingers, so that the operator can hold the handheld rod 13 stably. In this embodiment, the handheld device 1 is made of medical grade polycarbonate material.

[0048] Reference Figures 1-7 The outer puncture tube 22 is sleeved outside the front end of the inner puncture tube 21, with an annular gap between them forming a backflow channel 23. The inner diameter of the outer puncture tube 22 is 1.0-1.5 mm. An inclined plate 222 is fixedly connected to the front end of the outer puncture tube 22. The two ends of the inclined plate 222 are fixedly connected to the inner puncture tube 21 and the outer puncture tube 22, respectively. The inclined plate 222 is annularly arranged and has multiple first backflow holes 221. The backflow fluid enters the backflow channel 23 through the first backflow holes 221. The diameter of the first backflow holes 221 is 0.2-0.5 mm. The front end of the puncture needle 2 penetrates the housing 12 from back to front. The rear end of the puncture inner tube 21 is connected to the center of the medicine cylinder 14 and is fixedly connected to the medicine cylinder 14. The medicine is delivered to the injection hole through the puncture inner tube 21 for injection. The outer diameter of the puncture inner tube 21 is 0.5-1.2mm. In this embodiment, the puncture outer tube 22, the puncture inner tube 21 and the inclined plate 222 are made of 304 stainless steel in one piece. The inner diameter of the puncture outer tube 22 is 1.0mm, the inner diameter of the puncture inner tube 22 is 1.5mm, and the diameter of the first aspiration hole 221 is 0.3mm.

[0049] Reference Figure 1 and Figure 3The rear end of the housing 12 is provided with a first mounting groove 121 for placing the medicine cylinder 14. The medicine cylinder 14 can slide back and forth on the housing 12 through the first mounting groove 121. The medicine cylinder 14 is a cylindrical cylinder and is coaxially arranged with the puncture inner tube 21. The rear end of the puncture inner tube 21 is fixedly connected to the front outlet of the medicine cylinder 14. A piston 15 is provided inside the medicine cylinder 14 and is slidably connected to the inner wall of the medicine cylinder 14 along the puncture direction, dividing the medicine cylinder 14 into a medicine area at the front end and a cavity area at the rear end. Pushing the piston 15 causes the medicine to enter the puncture inner tube 21. An injection hole is provided on the outer circumference of the left side of the medicine cylinder 14. An injection channel 141 is fixedly connected to the injection hole for injecting and replenishing medicine into the medicine area.

[0050] Furthermore, the puncture module includes a puncture needle drive assembly 3 and a puncture length measuring assembly. The puncture needle drive assembly 3 is sleeved on the outer periphery of the puncture needle 2 and is used to drive the puncture needle 2 to reciprocate along the front and rear puncture direction. The puncture length measuring assembly is used to determine the puncture depth of the puncture needle 2.

[0051] Reference Figures 11-10 The puncture length measuring component includes a magnetic rod 4 and a magnetic block 5. A measuring groove 122 is provided on the left side of the front end of the housing 12, with the opening of the measuring groove 122 facing to the left. The magnetic rod 4 is evenly spaced within the measuring groove 122 along the puncture direction and is arranged longitudinally along the housing 12. The two ends of the magnetic rod 4 are rotatably connected to the groove wall of the measuring groove 122. The magnetic rod 4 has an N-S pole self-locking distribution, where the N pole is red and the S pole is black. The N-S pole self-locking distribution ensures that the magnetic rod 4 can stably maintain its state after being flipped, avoiding misreading or rebound, thereby improving the reliability of the measurement. The magnetic block 5 is located in the retraction sleeve. The connection between the magnetic block 5 and the magnetic rod 4 is a non-contact indirect magnetic connection, and the connection between the magnetic block 5 and the recovery baffle 8 is a non-contact connection. The magnetic block 5 moves synchronously with the retraction sleeve 6. When the puncture needle 2 is advanced, the magnetic block 5 passes through each magnetic rod 4 in sequence. As the puncture needle 2 moves, it drives the magnetic block 5 to slide along the puncture direction. Initially, the black magnetic rod 4 faces to the left. When it moves, the magnetic force pushes the magnetic rod 4 to rotate 180°, and the magnetic rod 4 forms a new self-locking direction. The magnetic rod 4 shakes and keeps the red part of the magnetic rod 4 facing outward. The left side of the housing 12 is marked with graduations corresponding to each magnetic rod 4. The distance that the magnetic block 5 moves is the puncture distance of the puncture needle 2. This puncture measurement component provides accurate depth information, enabling the operator to accurately inject the drug solution to the predetermined depth, effectively avoiding damage to surrounding tissues and improving the efficiency of nerve block puncture.

[0052] Reference Figures 3-4The housing 12 has a drive cavity 125 along its middle section. The puncture needle drive assembly 3 is disposed in the drive cavity 125. The rear end of the puncture inner tube 21 is configured as a threaded section, and the rear end of the threaded section is fixedly connected to the center of the medicine cylinder 14. The puncture needle drive assembly 3 includes a gear set 31 and a rotary drive component 32. The gear set 31 is located at the front end of the medicine cylinder 14, sleeved on the outer periphery of the puncture inner tube 21, and threadedly connected to the threaded section of the puncture inner tube 21. The fixed end of the rotary drive component 32 is located in the handheld device 1 and is used to drive the gear set 31 to rotate so as to drive the puncture needle 2 to reciprocate along the puncture direction.

[0053] Reference Figure 3 and Figure 11 The fixed end of the rotary drive 32 is detachably connected to the housing 12. The drive shaft of the rotary drive 32 is parallel to the puncture direction. One end of the drive shaft is fixedly connected to the rotary drive 32, and the other end is rotatably connected to the housing 12. The gear set 31 includes a drive wheel 311 and a driven wheel 312. The drive wheel 311 is sleeved on the outer circumference of the drive shaft and fixedly connected to the drive shaft. The driven wheel 312 is sleeved on the outer circumference of the puncture inner tube 21 and threadedly connected to the puncture inner tube 21. The driven wheel 312 meshes with the drive wheel 311. In this embodiment, the rotary drive 32 is a rotary motor. The rotary drive 32 drives the driven wheel 312 to rotate through the drive wheel 311, thereby driving the puncture needle 2 to slide along the puncture direction. In this embodiment, the rotary motor is a 16ECP EC brushless motor.

[0054] Furthermore, referring to Figures 1-13 The aspiration module includes a aspiration sleeve 6, a aspiration baffle 7, and a recovery baffle 8. The aspiration sleeve 6 is fitted around the puncture needle 2, with its front end extending from the front end of the handheld device 1 and its rear end engaging with the housing 12 for easy replacement after puncture. The aspiration baffle 7 is fitted around the puncture needle 2 and slidably connected to the inner wall of the aspiration sleeve 6, forming a pressure regulating chamber between its front side, the aspiration sleeve 6, and the puncture outer tube 22. The recovery baffle 8 is fitted around the puncture needle 2, forming a aspiration cavity between its front side, the aspiration baffle 7, and the aspiration sleeve 6, which communicates with the aspiration channel 23. The recovery cavity is formed between the rear side of the aspiration baffle 7 and the aspiration sleeve 6 for recovering fluid from the puncture site.

[0055] Specifically, the recovery baffle 8 is fixedly sleeved around the outer periphery of the puncture inner tube 21 and located inside the withdrawal sleeve 6, while the magnetic block 5 is located in the sliding space between the outside of the withdrawal sleeve 6 and the bottom of the measuring groove 122. The sidewall of the withdrawal sleeve 6 is made of a non-magnetic material, such as acrylic, and the magnetic block 5 and the recovery baffle 8 are magnetically attracted to each other through the sidewall of the withdrawal sleeve 6. This indirect connection method allows the magnetic block 5 to obtain the movement power of the puncture needle 2 without compromising the sealing of the withdrawal sleeve 6, ensuring the sterility and sealing of the withdrawal and recovery chambers.

[0056] Reference Figure 2 and Figure 5 The front end of the housing 12 is provided with a second mounting groove for placing the aspiration sleeve 6. The second mounting groove is a cylindrical groove that is opened along the puncture direction. The front end of the aspiration sleeve 6 extends out of the second mounting groove, and the rear end of the aspiration sleeve 6 is engaged with the groove wall of the second mounting groove. The puncture needle 2 passes through the drive cavity 125, the rear end of the aspiration sleeve 6 and the front end of the aspiration sleeve 6 in sequence from back to front along the puncture direction. The puncture outer tube 22 is sealed and slidably connected to the front end of the aspiration sleeve 6. In order to facilitate medical staff to observe the aspirated fluid, the aspiration sleeve 6 is made of transparent acrylic material.

[0057] Reference Figures 7-10 The recovery baffle 8 is sleeved on the outer periphery of the puncture inner tube 21. The recovery baffle 8 is fixedly connected to the outer periphery of the puncture inner tube 21. The recovery baffle 8 is slidably connected to the inner wall of the pull-back sleeve 6. The rear end of the puncture outer tube 22 is sealed and fixedly connected to the front side of the recovery baffle 8. When the puncture needle 2 slides forward, it drives the pull-back baffle 7 and the recovery baffle 8 to slide forward at the same time. The volume of the recovery chamber increases and the air pressure decreases. The recovery baffle 8 is made of magnetic material. In this embodiment, the magnetic block 5 is magnetically connected to the recovery baffle 8. When the recovery baffle 8 slides, it drives the magnetic block 5 to slide along the puncture direction.

[0058] Furthermore, the pullback baffle 7 is sleeved around the outer periphery of the puncture outer tube 22 and is slidably and sealingly connected to the outer wall of the puncture outer tube 22 and the inner wall of the pullback sleeve 6. A second pullback hole 223 is provided on the puncture outer tube 22 to connect the pullback chamber and the pullback channel 23. In order to improve the efficiency of the pullback fluid entering the pullback chamber, the second pullback hole 223 is opened near the recovery baffle 8. A pullback fluid control component is provided in the pullback chamber. The pullback fluid control component includes a sleeve 71 and an elastic element 72. The sleeve 71 is sleeved on the outside of the puncture outer tube 22 and is used to open or close the second pullback hole 223. In order to improve the contact stability between the pullback baffle 7 and the sleeve 71, the interface of the sleeve 71 is L-shaped. The elastic element 72 extends along the axial direction of the puncture needle 2. One end of the elastic element 72 is fixedly connected to the recovery baffle 8 and the other end is fixedly connected to the sleeve 71, which is used to drive the sleeve 71 to move along the axial direction of the puncture needle 2 to control the opening and closing state of the second pullback hole 223.

[0059] Reference Figure 12 In the initial state, the air pressure in the retraction chamber causes the rear side of the retraction baffle 7 to press against the front side of the sleeve 71, the elastic element 72 is in a compressed state, and the sleeve 71 closes the second retraction hole 223. (Refer to...) Figure 13 When the return baffle 7 slides, the pressure in the return chamber decreases, the elastic element 72 extends and pushes the sleeve 71 to slide forward, thereby opening the second return hole 223. The pressure difference between the return chamber and the return channel 23 drives the return fluid into the return chamber.

[0060] Reference Figure 7 and Figure 13The recovery baffle 8 has multiple recovery holes 81, and each recovery hole 81 is equipped with a one-way valve 82 to control the return fluid in the recovery chamber. When the return fluid needs to be recovered, the return baffle 7 slides backward, increasing the air pressure in the return chamber, which in turn pushes the one-way valve 82 to rotate backward and open. The return fluid in the return chamber can then enter the recovery chamber through the recovery holes 81 for recovery until the return baffle 7 presses against the sleeve 71, causing the sleeve 71 to close the second return hole 223. The elastic element 72 is in a compressed state, and the liquid in the recovery chamber is collected independently, facilitating secondary return by medical personnel. In this embodiment, four recovery holes 81 are evenly spaced on the recovery baffle 8. The elastic element 12 is a compression spring, and four elastic elements 12 are evenly spaced on the outer periphery of the sleeve 71. Four second return holes 223 are evenly spaced on the outer periphery of the puncture tube 22.

[0061] Reference Figures 10-11 , Figures 14-15 To facilitate aspiration and injection, the handheld device 1 is also equipped with a pressure adjustment module. The pressure adjustment module is located on the side of the housing 12 away from the puncture measurement component. The pressure adjustment module includes an air pump 91, an injection tube 92, and an aspiration tube 93. The air pump 91 is located inside the handheld device 1 and is used to adjust the pressure in the drug cylinder 14 and the pressure adjustment chamber. One end of the injection tube 92 is connected to the first output port on the rear side of the air pump 91, and the other end passes through the housing 12 along the length direction and connects with the cavity area of ​​the drug cylinder 14. One end of the aspiration tube 93 is connected to the second output port on the front side of the air pump 91, and the other end passes through the housing 12 and the aspiration sleeve 6 along the length direction and connects with the pressure adjustment chamber.

[0062] Specifically, the air pump 91 is embedded inside the right side of the housing 12. The housing 12 has an air pump storage slot and a slide 124. The slide 124 passes through the housing 12. One end of the injection tube 92 is inserted into the slide 124, and the other end is connected to the cavity area of ​​the medicine cylinder 14. The first output port of the air pump 91 is connected to the injection tube 92 through the slide 124. The injection tube 92 and the slide 124 are sealed and slidably connected. When the puncture needle 2 drives the medicine cylinder 14 to slide, the injection tube 92 can slide synchronously in the slide. The air pump 91 injects gas into the cavity area through the injection tube 92 to push the piston 15 to slide forward, thereby making the medicine flow out of the injection hole through the puncture inner tube 21. In this embodiment, the air pump 91 is an NMP03 series micro diaphragm air pump.

[0063] Reference Figure 8 , Figure 12 and Figure 13A reflux module is provided on the puncture inner tube 21. The reflux module includes a reflux tube 211 and a reflux hole 212. The reflux tube 211 is sleeved on the outer periphery of the puncture inner tube 21, and its front end is fixedly connected to the rear side of the recovery baffle 8, forming a reflux cavity with the outer periphery of the puncture inner tube 21. The reflux hole 212 is opened on the puncture inner tube 21 to connect the reflux cavity and the puncture inner tube 21. A pressure detector is set in the reflux cavity and located on the inner wall of the reflux tube 211 to detect the pressure in the reflux cavity. In this embodiment, the pressure sensor is a P2705 miniature low-pressure MEMS sensor.

[0064] Specifically, the front end of the return tube 211 passes through the rear end of the housing 12 and the return sleeve 6 along the center. The front end of the return tube is fixedly connected to the recovery baffle 8, and the rear end of the return tube 211 is fixedly connected to the front end of the threaded section of the puncture inner tube 21. A return cavity is formed between the inner wall of the return tube 211, the outer wall of the puncture inner tube 21, and the recovery baffle 8. When the injection pressure of the drug solution is too high, the drug solution enters the return cavity through the return hole 212, and the pressure in the return cavity increases accordingly. When the pressure detector detects that the pressure in the return cavity has increased, The pressure of the injected drug solution is adjusted by the air pump 91 to reduce the injection speed. The drug solution in the reflux chamber can re-enter the puncture inner tube 21 through the reflux hole 212. This effectively regulates the pressure of the liquid in the puncture inner tube 21 while reducing drug waste and avoiding local high pressure during injection, thereby reducing the risk of tissue damage. In this embodiment, in order to facilitate the entry of the drug solution into the reflux chamber, the reflux hole 212 is set close to the recovery baffle 8. The pressure detector is electrically connected to the air pump 91 to facilitate the adjustment of the pressure in the cavity area.

[0065] One end of the return pipe 93 is inserted into the housing 12 and connected to the second air outlet of the air pump 91. The other end of the return pipe 93 is sealed and connected by the side wall of the return sleeve 6. The air pump 91 draws air through the return pipe 93 to reduce the air pressure in the pressure regulating chamber so as to drive the return baffle 7 to slide forward. The air pump 91 inflates air through the return pipe 93 to increase the air pressure in the pressure regulating chamber so as to drive the return baffle 7 to slide backward. The housing 12 is also provided with an air hole 123. An air pipe is provided in the air hole 123. One end of the air pipe is connected to the air pump 91, and the other end extends to the outside of the air hole 123 for the air pump 91 to draw in and exhaust air.

[0066] For ease of operation, please refer to Figures 1-4 The upper pressure cover 11 is equipped with multiple control buttons 16, a control system, and a lithium-ion battery. Each control button 16 is electrically connected to the control system. The rotary drive 32, the air pump 91, and the pressure sensor are electrically connected to the control system. The lithium-ion battery is used to power the rotary drive 32 and the air pump 91 of the control system to control the driving direction and rotation stop of the rotary drive 32, and to control the air pump 91 to adjust the pressure in the return chamber and the cavity area.

[0067] Working principle: Medical staff inject or replenish the required medication into the medication area of ​​the medication cylinder 14 through the peripheral injection channel 141 on the left side of the medication cylinder 14. The operator holds the handheld device 1 stably through the groove 131 on the front side of the handle 13 and performs all subsequent automated operations through the control button 16 on the upper pressure cover 11. When the operator presses the needle insertion button, the rotary drive component 32 inside the handheld device 1 rotates, driving the drive wheel on the drive shaft to rotate. The drive wheel drives the driven wheel sleeved on the puncture inner tube 21 to rotate, driving the puncture needle 2 to move forward smoothly along the puncture direction through threaded transmission; during the forward movement of the puncture needle 2, the magnetic iron block inside the retraction sleeve 6 slides forward simultaneously. The movement of the magnet will cause the magnetic rod 4 in the measuring groove 122 to rotate 180°, changing from the black S pole to the red N pole. This allows the operator to intuitively judge the insertion depth and position of the puncture needle 2 by observing the color change of the magnetic rod 4. Since the magnetic rod 4 has a self-locking distribution of the N and S poles, it will stably keep the red side facing outward after the rotation. The operator can directly read the corresponding scale on the left side of the housing 12 to obtain the actual puncture depth with high precision, avoiding injury to surrounding tissues.

[0068] Once the puncture needle 2 reaches the predetermined depth, a suction test is required before injection. The operator controls the air pump 91 to aspirate air via a button. The air pump 91 draws gas out of the pressure regulating chamber through the suction tube 93, causing a decrease in air pressure. The pressure difference causes the suction baffle 7 to slide forward, and the pressure in the suction chamber also decreases accordingly. The elastic element 72 of the suction baffle extends, pushing the sleeve 71 forward, thereby opening the second suction port 223. Fluid at the puncture site (such as blood or tissue fluid) enters the suction channel 23 through the first suction port 221 on the inclined plate 222 at the front end of the puncture outer tube 22, and then flows into the transparent suction chamber through the opened second suction port 223. Medical personnel observe whether there is blood through the transparent acrylic suction sleeve 6 to determine whether the needle tip has accidentally entered a blood vessel.

[0069] If the return chamber needs to be cleaned or a second return is required, the air pump 91 pressurizes the pressure regulating chamber through the return pipe 93. The increased air pressure pushes the return baffle 7 backward. The backward movement of the return baffle 7 causes a sharp decrease in air pressure in the return chamber, triggering the one-way valve 82 on the recovery baffle 8 to open. The liquid in the return chamber is drawn into the subsequent recovery chamber through the recovery hole 81 for independent storage. When the return baffle 7 continues to move backward and presses against the sleeve 71, the elastic element 72 is compressed, and the sleeve 71 re-closes the second return hole 223, restoring the system to its initial closed state where it can be returned again.

[0070] After confirming that no blood vessel has been accidentally entered, the operator presses the injection button. The air pump 91 injects gas into the cavity at the rear end of the medication cartridge 14 through the injection tube 92. The gas pressure pushes the piston 15 inside the medication cartridge 14 forward, precisely pressing the medication into the puncture inner tube 21, and finally injecting it into the target nerve perineurium through the injection port at the front end. If the local tissue pressure is too high during injection, the medication will be forced into the reflux chamber through the reflux port 212 on the puncture inner tube 21. Once the pressure detector in the reflux chamber detects an abnormally high pressure, it will immediately send a signal to the system, which will then automatically reduce the pushing pressure of the air pump 91.

[0071] After the pressure decreases, the medication in the reflux chamber can return to the puncture tube 21 through the reflux hole 212 for continued injection. After the injection is completed, open the upper pressure cap 11, disassemble the medication cylinder 14, puncture needle 2, injection tube 92, aspiration tube 93 and aspiration sleeve 6, replace the components, zero the scale, close the cap, and the assembly is complete for the next use.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A nerve block puncture and drug delivery system, comprising a handheld device (1), characterized in that, Also includes: The puncture tube (21) has an injection hole at the front end that passes through the handheld device (1) and is connected to the drug cylinder (14) at the rear end for delivering drug solution; The outer tube (22) has a first pull-back hole (221) at the front end, which is sleeved on the front end of the inner tube (21) to form a puncture needle (2) with the inner tube (21) and to form a pull-back channel (23) around the outer periphery of the inner tube (21). The puncture module is located on the outer periphery of the puncture inner tube (21) and is used to control the extension length of the puncture inner tube (21) and the puncture outer tube (22); The aspiration module is located at the front end of the puncture tube (22) and is connected to the aspiration channel (23) for aspirating and storing the puncture site fluid.

2. The nerve block puncture and drug injection system according to claim 1, characterized in that, The puncture module includes: The puncture needle drive assembly (3) is sleeved on the outer periphery of the puncture needle (2) and is used to drive the puncture needle (2) to reciprocate along the front and rear puncture direction; A puncture length measuring component is used to determine the puncture depth of the puncture needle (2).

3. The nerve block puncture and drug injection system according to claim 1, characterized in that, The puncture length measuring component includes: The magnetic rod (4) is evenly spaced along the puncture direction on the outside of the handheld device (1) and has an N-S pole self-locking distribution; A magnetic block (5) is located on the outer periphery of the puncture needle (2). When it moves, it pushes the corresponding magnetic rod (4) to rotate 180°, which is used to determine the puncture depth of the puncture needle (2).

4. The nerve block puncture and drug injection system according to claim 1, characterized in that, The puncture needle drive assembly (3) includes: The gear set (31) is located at the rear end of the retraction sleeve (6), and is sleeved on the outer periphery of the puncture inner tube (21) and threadedly connected to the puncture inner tube (21). The rotating drive (32) has its fixed end located inside the handheld device (1) and is used to drive the gear set (31) to rotate so as to drive the puncture needle (2) to reciprocate along the puncture direction.

5. The nerve block puncture and drug injection system according to claim 1, characterized in that, The pullback module includes: The retractable sleeve (6) is fitted around the puncture needle (2), with its front end extending out of the handheld device (1). A retraction baffle (7) is sleeved on the outer periphery of the puncture needle (2) and slidably connected to the inner wall of the retraction sleeve (6). The front side forms a pressure regulating cavity between the retraction sleeve (6) and the puncture outer tube (22). A recovery baffle (8) is sleeved around the puncture needle (2), and a recovery cavity is formed between the front side of the recovery baffle (7) and the recovery sleeve (6), and the recovery cavity is connected to the recovery channel (23).

6. The nerve block puncture and drug delivery system according to claim 5, characterized in that, The puncture tube (22) is provided with a second aspiration hole (223) for connecting the aspiration chamber and the aspiration channel (23). The aspiration chamber is provided with an aspiration fluid control assembly. The aspiration fluid control assembly includes: The cannula (71) is sleeved outside the puncture outer tube (22) and is used to open or close the second pull-out hole (223). The elastic element (72) is connected at one end to the recovery baffle (8) and at the other end to the sleeve (71), and is used to drive the sleeve (71) to move along the axial direction of the puncture needle (2) to control the opening and closing state of the second return hole (223).

7. The nerve block puncture and drug injection system according to claim 5, characterized in that, A recovery chamber is formed between the rear side of the retraction baffle (7) and the retraction sleeve (6). The recovery chamber and the retraction chamber are connected by a one-way valve (82) for recovering the liquid at the puncture site.

8. The nerve block puncture and drug injection system according to claim 1, characterized in that, A pressure regulating module is also provided, the pressure regulating module comprising: An air pump (91) is located inside the handheld device (1) and is used to adjust the pressure in the liquid cylinder (14) and the pressure regulating chamber. The injection tube (92) is connected at one end to the first output port of the air pump (91) and at the other end to the liquid cylinder (14). The return pipe (93) is connected at one end to the second output port of the air pump (91) and at the other end to the pressure regulating chamber.

9. The nerve block puncture and drug injection system according to claim 1, characterized in that, A recirculation module is also provided, the recirculation module comprising: The reflux tube (211) is sleeved on the outer periphery of the puncture inner tube (21), with its front end abutting against the rear side of the recovery baffle (8), and forming a reflux cavity with the outer periphery of the puncture inner tube (21); A reflux hole (212) is provided on the puncture inner tube (21) to connect the reflux cavity with the puncture inner tube (21).

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