Ultrasound-guided nerve block puncture device

Abstract

The invention belongs to the field of medical instruments, and discloses an ultrasound-guided nerve block puncture device which comprises a puncture catheter unit and a subcutaneous tunnel unit and further comprises a pasting part and a clamping part. The puncture indwelling catheter unit comprises a puncture needle and an indwelling catheter, the puncture needle and the indwelling catheter jointly pierce from a first puncture point, and after the puncture needle reaches a target area, the indwelling catheter is axially pushed to the target area along the puncture needle; the subcutaneous tunnel unit is used for puncturing from the second puncture point, the puncture needle is slidably connected to the interior of the indwelling catheter, and a subcutaneous tunnel for the tail end of the indwelling catheter to penetrate through is constructed between the first puncture point and the second puncture point; the indwelling catheter is arranged on the outer side of the puncture needle in a sliding and sleeving mode, the puncture needle provides rigid support for the soft indwelling catheter, guidance is provided for movement of the indwelling catheter, and it is ensured that the indwelling catheter can reach a target area along a preset track; and the problem that the indwelling catheter is easy to deviate and distort due to secondary catheter indwelling after needle withdrawing in the traditional method is effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to an ultrasound-guided nerve block puncture device. Background Technology

[0002] Ultrasound-guided nerve block is a commonly used analgesic technique in clinical practice. It involves puncturing near the target nerve and inserting an indwelling catheter for continuous drug administration to achieve long-term analgesia. The current standard clinical procedure follows a two-part process of "puncture-needle withdrawal-catheter insertion-fixation": first, the puncture needle is used to reach the target area, the needle core is withdrawn, and then the catheter is inserted along the outer cannula of the puncture needle, and finally it is fixed with tape. In this traditional approach, when inserting the catheter a second time after needle withdrawal, the flexible catheter is difficult to advance accurately along the original path and is prone to deviation or twisting, resulting in a decrease in the blocking effect. Therefore, the existing technology has the problem that the catheter is prone to deviation or twisting during the second insertion, which leads to insufficient accuracy in the catheter placement position. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide an ultrasound-guided nerve block puncture device that solves the problem in existing technologies where the catheter is prone to deviation or twisting during secondary placement, resulting in insufficient accuracy in catheter placement.

[0004] The objective of this invention can be achieved through the following technical solutions: An ultrasound-guided nerve block puncture device includes a puncture and cannulation unit and a subcutaneous tunnel unit, and also includes an adhesive part and a clamping part; The puncture and catheterization unit includes a puncture needle and an indwelling catheter. The puncture needle and the indwelling catheter are inserted together from the first puncture point. When the puncture needle reaches the target area, the indwelling catheter is pushed to the target area along the axial direction of the puncture needle. The subcutaneous tunnel unit is used to insert the needle from the second puncture point. The puncture needle is slidably connected to the inside of the indwelling catheter and a subcutaneous tunnel is constructed between the first puncture point and the second puncture point for the end of the indwelling catheter to pass through. The adhesive part is pasted onto the patient's skin, close to the second puncture point; The clamping part is attached to the side of the adhesive part away from the patient's skin and is used to clamp and fix the peripheral wall of the indwelling catheter tip.

[0005] Furthermore, both ends of the puncture needle extend to the outer sides of both ends of the indwelling catheter.

[0006] Furthermore, multiple circular microprism rings are fixedly connected to the periphery of the puncture needle along its own axis.

[0007] Furthermore, the outer peripheral wall of the indwelling catheter is provided with scale lines arranged along its own axis.

[0008] Furthermore, the subcutaneous tunnel unit includes a needle core and a needle tube with openings at both ends. The needle core is slidably connected inside the needle tube, and the length of the needle core is greater than the length of the needle tube. The inner peripheral wall diameter of the needle tube is greater than the outer peripheral wall diameter of the indwelling catheter. One end of the needle core extends to the outside of one end of the needle tube and forms a blunt-tipped puncture section, while the other end of the needle core forms a handhold for holding.

[0009] Furthermore, the clamping part includes a frustum-shaped shell with openings at both ends. The outer peripheral wall of the shell is provided with external threads, and multiple notches are opened along its own axis on the peripheral wall of the shell. The multiple notches are evenly distributed in a ring around the central axis of the shell, and each notch penetrates the smaller diameter end of the outer side of the shell. The part of the shell located between two adjacent notches forms a clamping flap that can be elastically formed along the radial direction of the shell. The smaller diameter end of the shell is provided with a threaded sleeve placed on the same axis. Both ends of the threaded sleeve are open. The inner peripheral wall of the threaded sleeve is provided with an internal thread that matches the external threads on the shell. The threaded sleeve is connected to the external thread section at the smaller diameter end of the shell through the internal thread. When the threaded sleeve is screwed toward the end with the larger diameter of the housing, the threaded sleeve squeezes and clamps the clamping flap toward the central axis of the housing.

[0010] Furthermore, a rubber pad made of elastic material is fixed on the inner peripheral wall of the shell in the area between any two adjacent notches.

[0011] Furthermore, the adhesive portion includes a dressing for adhering to the patient's skin, and at least one first connector is fixed to the side of the dressing away from the patient's skin; The clamping part also includes a butterfly wing, on which a plurality of second connectors adapted to the first connector are fixed. The number of second connectors is equal to that of the first connector and they correspond one-to-one. The first connector and the second connector are detachably connected.

[0012] Furthermore, a Luer connector is fixedly connected to the larger diameter end of the shell, and the Luer connector is used to connect the end of the indwelling catheter to the smaller diameter end of the shell.

[0013] Furthermore, the diameter of the blunt-tipped puncture portion gradually decreases in the direction away from the hand-held portion, and the end of the blunt-tipped puncture portion furthest from the hand-held portion is spherical.

[0014] The beneficial effects of this invention are: 1. By sliding the indwelling catheter onto the outside of the puncture needle, after the puncture needle is inserted into place, the indwelling catheter is pushed along the puncture needle. The puncture needle provides rigid support for the soft indwelling catheter and provides guidance for the movement of the indwelling catheter, ensuring that the indwelling catheter can reach the target area along the predetermined trajectory. This effectively avoids the problems of easy deviation and twisting of the indwelling catheter caused by the second insertion of the catheter after needle withdrawal in the traditional method. At the same time, the adhesive part and the clamping part are designed together to fix and limit the peripheral wall of the indwelling catheter tip, so as to avoid axial movement of the indwelling catheter due to the patient's body movement; 2. By setting the microprism ring, the acoustic impedance difference between the puncture needle and the skin tissue is increased during the puncture process, so that the puncture needle can generate a clear echo signal in the ultrasound image, which facilitates the precise ultrasound tracking of the puncture needle position and ensures that the puncture needle can accurately reach the target area. The scale lines facilitate quick reading of the insertion depth of the indwelling catheter, reducing the number of times intraoperative fluoroscopy or postoperative X-rays are needed to confirm the position of the indwelling catheter. 3. By cooperating with the main body, external thread, notch, and threaded sleeve, tightening the threaded sleeve causes each clamping flap to retract inward and clamps and fixes the peripheral wall of the indwelling catheter; and by controlling the tightening degree of the threaded sleeve, the clamping force of the indwelling catheter can be controlled and adjusted. Furthermore, the rubber pads provide a buffer between the indwelling catheter and the clamping valve, effectively reducing wear between them and increasing friction with the catheter's peripheral wall. This enhances the stability of the clamping and fixation, preventing axial movement of the indwelling catheter. Attached Figure Description

[0015] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a portion of the structure of the microprism ring of the present invention; Figure 3 This is a schematic diagram of the threaded sleeve portion of the present invention; Figure 4 This is a partial structural diagram of the housing of the present invention; Figure 5 This is a schematic diagram of the structure of the application site of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 5 As shown, an ultrasound-guided nerve block puncture device includes a puncture and cannulation unit 100 and a subcutaneous tunnel unit 200, as well as an adhesive part 300 and a clamping part 400. The puncture and catheterization unit 100 includes a puncture needle 101 and an indwelling catheter 102. The puncture needle 101 is slidably connected inside the indwelling catheter 102. The puncture needle 101 and the indwelling catheter 102 are inserted together from the first puncture point. When the puncture needle 101 reaches the target area, the indwelling catheter 102 is pushed to the target area along the axial direction of the puncture needle 101. The subcutaneous tunneling unit 200 is used to insert from the second puncture point and to construct a subcutaneous tunnel between the first puncture point and the second puncture point for the end of the indwelling catheter 102 to pass through; The adhesive part 300 is attached to the patient's skin, close to the second puncture point; The clamping part 400 is connected to the adhesive part 300 on the side away from the patient's skin and is used to clamp and fix the peripheral wall of the end of the indwelling catheter 102. During puncture, the indwelling catheter 102 and the puncture needle 101 are inserted into the skin tissue together. Under real-time ultrasound guidance, once the tip of the puncture needle 101 reaches the target area, the puncture needle 101 is stopped from being pushed. If the tip of the indwelling catheter 102 has not reached the designated target area at this time, the indwelling catheter 102 is pushed along the puncture needle 101 to continue deeper. Throughout the puncture process, the puncture needle 101 is not only used to puncture the skin tissue, but also provides rigid support for the softer indwelling catheter 102 and provides guidance for the movement of the indwelling catheter 102, ensuring that the indwelling catheter 102 can reach the target area along the predetermined trajectory. This effectively avoids the problems of easy deviation and twisting of the indwelling catheter 102 caused by the secondary insertion of the catheter after needle withdrawal in traditional methods. After the end of the indwelling catheter 102 passes through the subcutaneous tunnel, the adhesive part 300 and the clamping part 400 are used to fix and limit the peripheral wall of the end of the indwelling catheter 102, so as to prevent the indwelling catheter 102 from being pulled axially due to the patient's body movement.

[0019] Both ends of the puncture needle 101 extend to the outer sides of both ends of the indwelling catheter 102, so that medical personnel can hold the end of the puncture needle 101 to perform puncture operations.

[0020] Multiple circular microprism rings 103 are fixedly connected to the periphery of the puncture needle 101 along its own axis. By setting the microprism rings 103, the acoustic impedance difference between the puncture needle 101 and the skin tissue is increased during the puncture process, so that the puncture needle 101 can generate a clear echo signal in the ultrasound image, which facilitates the precise ultrasound tracking of the position of the puncture needle 101 and ensures that the puncture needle 101 can accurately reach the target area. Preferably, the inner wall of the indwelling catheter 102 is coated with a silicone oil lubricating layer.

[0021] The outer peripheral wall of the indwelling catheter 102 is provided with scale lines 1021 arranged along its own axis; the scale lines 1021 make it easy to quickly read the insertion depth of the indwelling catheter 102, reducing the number of times the position of the indwelling catheter 102 needs to be confirmed by intraoperative fluoroscopy or postoperative X-ray.

[0022] The subcutaneous tunnel unit 200 includes a needle core 201 and a needle tube 202 with openings at both ends. The needle core 201 is slidably connected inside the needle tube 202, and the length of the needle core 201 is greater than the length of the needle tube 202. The inner peripheral wall diameter of the needle tube 202 is greater than the outer peripheral wall diameter of the indwelling catheter 102. One end of the needle core 201 extends to the outside of one end of the needle tube 202 and forms a blunt-tipped puncture part 2011, while the other end of the needle core 201 forms a handhold for holding. By using a blunt-tipped puncture head 2011 to contact the skin tissue, it is ensured that the separation of the skin tissue during the construction of the subcutaneous tunnel is done by "spreading" rather than "cutting", thereby effectively reducing damage to subcutaneous blood vessels and nerves during the construction of the subcutaneous tunnel; Preferably, before the needle core 201 is inserted, the puncture needle 101 can be used to puncture the surface layer of the skin tissue so that the needle core 201 and the needle tube 202 can be inserted to construct a subcutaneous tunnel; The needle core 201 guides the needle tube 202 into the second puncture point, so that the front end of the needle tube 202 exits from the first puncture point, while keeping the end of the needle tube 202 outside the second puncture point. After the needle core 201 is withdrawn, a subcutaneous tunnel is formed inside the needle tube 202. Then, the end of the indwelling catheter 102 is continuously pushed into the needle tube 202, so that the end of the indwelling catheter 102 exits from the second puncture point after being guided by the needle tube 202. Finally, the needle tube 202 is withdrawn to complete the corresponding operation.

[0023] Preferably, the indwelling catheter 102 is 20 cm long and has an outer diameter of 20 G; the needle 202 is 10 cm long.

[0024] The clamping part 400 includes a frustum-shaped housing 401 with openings at both ends. The outer peripheral wall of the housing 401 is provided with an external thread 4011. Multiple notches 4012 are opened on the peripheral wall of the housing 401 along its own axis. The multiple notches 4012 are evenly distributed in a ring around the central axis of the housing 401, and each notch 4012 penetrates the smaller diameter end of the outer side of the housing 401. The portion of the housing 401 between two adjacent notches 4012 forms a clamping flap that can be elastically formed radially along the housing 401. The smaller diameter end of the housing 401 is provided with a threaded sleeve 402 placed coaxially. Both ends of the threaded sleeve 402 are open. The inner peripheral wall of the threaded sleeve 402 is provided with an internal thread that matches the external thread 4011 on the housing 401. The threaded sleeve 402 is connected to the external thread 4011 segment at the smaller diameter end of the housing 401 through the internal thread. When the threaded sleeve 402 is screwed and rotated toward the end of the housing 401 with a larger diameter, the threaded sleeve 402 squeezes and retracts the clamping flap toward the central axis end of the housing 401. When clamping the indwelling catheter 102, the end of the indwelling catheter 102 is inserted into the housing 401 from the smaller diameter end of the housing 401, and then the threaded sleeve 402 is tightened to make each clamping flap retract inward and clamp and fix the periphery of the indwelling catheter 102; by controlling the degree of tightening of the threaded sleeve 402, the clamping force of the indwelling catheter 102 can be controlled and adjusted.

[0025] An elastic material pad 403 is fixed on the inner peripheral wall of the housing 401 in the area between any two adjacent notches 4012; Preferably, the pad 403 can be made of silicone or rubber material; By setting the rubber pad 403, a buffer is provided between the indwelling catheter 102 and the clamping flap, which effectively reduces the wear between the clamping flap and the indwelling catheter 102, increases the friction with the peripheral wall of the indwelling catheter 102, improves the stability of clamping and fixing, and prevents the indwelling catheter 102 from moving axially. It should be noted that the length of the threaded sleeve 402 along its own axis is greater than the length of the notch 4012; this is to ensure that the notch 4012 can be covered to a certain extent during the connection process, reducing the intrusion of contaminants.

[0026] The adhesive part 300 includes a patch 301 for being adhered to the patient's skin, and at least one first connector 302 is fixed to the side of the patch 301 away from the patient's skin. The clamping part 400 also includes a butterfly wing 404, on which a plurality of second connectors 405 adapted to the first connector 302 are fixed. The number of second connectors 405 is equal to that of the first connectors 302 and they correspond one-to-one. The first connectors 302 and the second connectors 405 are detachably connected. Preferably, the first connector 302 and the second connector 405 are a male and a female, respectively.

[0027] A Luer connector 500 is fixedly connected to one end of the housing 401 with a larger diameter. The end of the Luer connector 500 near the smaller diameter of the housing 401 is used to connect to the end of the indwelling catheter 102. In use, the other end of the Luer connector 500 is used to connect components such as syringes and infusion tubing to deliver medication into the indwelling catheter 102.

[0028] The diameter of the blunt-tipped puncture portion 2011 gradually decreases in the direction away from the hand-held portion, and the end of the blunt-tipped puncture portion 2011 furthest from the hand-held portion is spherical.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An ultrasound-guided nerve block puncture device, comprising a puncture and cannulation unit (100) and a subcutaneous tunnel unit (200), characterized in that, It also includes an adhesive part (300) and a clamping part (400); The puncture and catheterization unit (100) includes a puncture needle (101) and an indwelling catheter (102). The puncture needle (101) is slidably connected inside the indwelling catheter (102). The puncture needle (101) and the indwelling catheter (102) are inserted together from the first puncture point. When the puncture needle (101) reaches the target area, the indwelling catheter (102) is pushed along the axial direction of the puncture needle (101) to the target area. The subcutaneous tunnel unit (200) is used to insert from the second puncture point and to construct a subcutaneous tunnel between the first puncture point and the second puncture point for the end of the indwelling catheter (102) to pass through; The adhesive part (300) is attached to the patient's skin, close to the second puncture point; The clamping part (400) is connected to the side of the adhesive part (300) away from the patient's skin and is used to clamp and fix the peripheral wall of the end of the indwelling catheter (102).

2. The ultrasound-guided nerve block puncture device according to claim 1, characterized in that, Both ends of the puncture needle (101) extend to the outer sides of both ends of the indwelling catheter (102).

3. The ultrasound-guided nerve block puncture device according to claim 2, characterized in that, Multiple circular microprism rings (103) are fixedly connected to the peripheral wall of the puncture needle (101) along its own axis.

4. The ultrasound-guided nerve block puncture device according to claim 3, characterized in that, The outer peripheral wall of the indwelling catheter (102) is provided with scale lines (1021) arranged along its own axis.

5. The ultrasound-guided nerve block puncture device according to claim 1, characterized in that, The subcutaneous tunnel unit (200) includes a needle core (201) and a needle tube (202) with openings at both ends. The needle core (201) is slidably connected inside the needle tube (202), and the length of the needle core (201) is greater than the length of the needle tube (202). The inner peripheral wall diameter of the needle tube (202) is greater than the outer peripheral wall diameter of the indwelling catheter (102). One end of the needle core (201) extends to the outside of one end of the needle tube (202) and forms a blunt-tipped puncture part (2011), while the other end of the needle core (201) forms a hand-held part for holding.

6. The ultrasound-guided nerve block puncture device according to claim 5, characterized in that, The clamping part (400) includes a frustum-shaped housing (401) with openings at both ends. External threads (4011) are provided on the outer peripheral wall of the housing (401). Multiple notches (4012) are formed on the peripheral wall of the housing (401) along its own axial direction. The multiple notches (4012) are evenly distributed in a ring around the central axis of the housing (401), and each notch (4012) penetrates the smaller diameter end of the outer side of the housing (401). The housing (401) is located between two adjacent notches (4011). The portion between 012) forms a clamping flap that can be elastically formed radially along the shell (401). The end of the shell (401) with a smaller diameter is provided with a threaded sleeve (402) placed on the same axis. Both ends of the threaded sleeve (402) are open. The inner peripheral wall of the threaded sleeve (402) is provided with an internal thread that matches the external thread (4011) on the shell (401). The threaded sleeve (402) is connected to the external thread (4011) segment at the end of the shell (401) with a smaller diameter through the internal thread. When the threaded sleeve (402) is screwed and rotated toward the end with a larger diameter closer to the housing (401), the threaded sleeve (402) squeezes and clamps the clamping petals toward the central axis end of the housing (401).

7. The ultrasound-guided nerve block puncture device according to claim 6, characterized in that, An elastic pad (403) is fixed on the inner peripheral wall of the housing (401) in the area between any two adjacent notches (4012).

8. The ultrasound-guided nerve block puncture device according to claim 7, characterized in that, The adhesive part (300) includes a dressing (301) for being adhered to the patient's skin, and at least one first connector (302) is fixed to the side of the dressing (301) away from the patient's skin. The clamping part (400) also includes a butterfly wing (404), on which a plurality of second connectors (405) adapted to the first connector (302) are fixed. The number of second connectors (405) is equal to that of the first connectors (302) and they correspond one-to-one. The first connectors (302) and the second connectors (405) are detachably connected.

9. The ultrasound-guided nerve block puncture device according to claim 8, characterized in that, A Luer connector (500) is fixedly connected to the larger diameter end of the housing (401). The Luer connector (500) near the smaller diameter end of the housing (401) is used to connect to the end of the indwelling catheter (102).

10. The ultrasound-guided nerve block puncture device according to claim 5, characterized in that, The diameter of the blunt-tipped puncture portion (2011) gradually decreases in the direction away from the hand-held portion, and the end of the blunt-tipped puncture portion (2011) furthest from the hand-held portion is spherical.

Images