Electrical stimulation needle with guide sheath

Abstract

The utility model discloses an electrical stimulation needle with a guide sheath, which comprises a needle body assembly, the guide sheath, a lead terminal and a micro permeation tube, the needle body assembly comprises a hollow needle tube and a needle seat arranged at the rear end of the needle tube, the front end of the needle tube is provided with a needle point for puncturing, and the needle seat is provided with a liquid injection cavity communicated with the needle tube; the guide sheath is provided with a guide cavity, the guide sheath sleeves the periphery of the needle tube, and one end, deviating from the needle tip, of the guide sheath is detachably connected to the needle seat through a sheath tube seat; the wire terminal is connected to the rear end of the needle tube so as to transmit pulse current to the needle tip. A flow channel is formed in the micro-permeation tube, the micro-permeation tube can penetrate through the guide cavity and move in the extending direction of the guide cavity, the micro-permeation tube penetrates through the guide cavity and moves to a preset position in the extending direction of the guide cavity, the guide sheath and the sheath tube base are moved away, and the micro-permeation tube is used for continuous injection of follow-up medicine. And compared with the guide sheath, the micro-permeation tube has a smaller outer diameter, so that the damage of the sleeve to surrounding tissues can be relieved and even avoided.

Description

[0001] The present application claims priority to the Chinese patent application No. 202422840539.X, filed on November 21, 2024, and entitled "An electric stimulation needle with a guide sheath", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The utility model relates to the field of medical technology, especially to an electric stimulation needle with a guide sheath. BACKGROUND

[0003] Continous peripheral nerve block (PNB) is a technique that combines peripheral nerve block puncture, precisely places a cannula at the local peripheral nerve plexus, and continuously administers a small amount of local peripheral nerve infiltration to achieve long-term postoperative analgesia and sympathetic nerve block in patients.

[0004] The prior art is to remove the puncture needle after the puncture with the cannulated nerve puncture needle, and the cannula is left in the puncture site for continuous drug delivery by the bypass infusion tube of the cannula seat. However, nerve plexus puncture is different from blood vessel puncture. The needle insertion angle is usually determined according to the distribution of nerves and blood vessels, and the needle insertion angle is relatively large. Since the cannula seat is in a straight line with the cannula, when the puncture is completed and the puncture needle is removed, the cannula seat will also form a large angle with the skin surface. At this time, the cannula seat is fixed to the skin surface, which will cause the cannula to be folded. In addition, the cannula has a thin wall, which leads to poor infusion or blockage. Moreover, the cannula has a large outer diameter, which causes greater damage to the surrounding tissue when left in the puncture site for a long time.

[0005] Therefore, how to reduce or even avoid the damage of the cannula to the surrounding tissue is a technical problem that needs to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims to provide an electric stimulation needle with a guide sheath, which can reduce or even avoid the damage of the cannula to the surrounding tissue.

[0007] To achieve the above-mentioned purpose, the utility model provides an electric stimulation needle with a guide sheath, which comprises:

[0008] The needle body assembly comprises a hollow needle tube and a needle seat arranged at the rear end of the needle tube. The front end of the needle tube is provided with a needle tip for puncture. The needle seat is provided with a liquid injection cavity connected to the needle tube.

[0009] The guide sheath is provided with a guide cavity for guiding the sheath to be sleeved on the outer periphery of the needle tube. One end of the guide sheath, which is away from the needle tip, is detachably connected to the needle seat through a sheath tube seat.

[0010] The wire terminal is connected to the rear end of the needle tube to transmit the pulse current to the needle tip.

[0011] The micropermeable tube has an internal flow channel and can be inserted into the guide cavity and move along the extension direction of the guide cavity.

[0012] Preferably, the guide sheath has a tapered structure at the end away from the needle hub. The tapered structure includes a first end with a larger cross-sectional dimension and a second end with a smaller cross-sectional dimension. The distance between the second end and the needle tip on the needle tube axis is less than the distance between the first end and the needle tip on the needle tube axis, and the end face of the second end is perpendicular to the needle tube axis.

[0013] Preferably, the micropermeable tube includes a third end that moves along the guide cavity and a fourth end that is opposite to the third end. The third end is provided with a side hole, and the fourth end is connected to a connector that communicates with the flow channel for liquid flow. The axes of the fourth end and the connector overlap.

[0014] Preferably, the guide sheath is a transparent body, and the sheath wall of the guide sheath has multiple lines distributed along the axis of the guide sheath for ultrasonic imaging;

[0015] The syringe has a first graduation mark.

[0016] Preferably, the micropermeation tube is provided with a second scale marking.

[0017] Preferably, the needle hub has a first protrusion through which the needle tube passes, and the sheath hub has a first groove adapted to the first protrusion to guide the sheath and the needle tube to be fixed relative to each other.

[0018] Preferably, the guide sheath has a vulnerable portion extending along its own length, which can be torn to allow the guide sheath to detach radially from the micropermeable tube.

[0019] Preferably, the axis of the injection chamber overlaps with the axis of the syringe.

[0020] Preferably, the outer diameter of the micropermeable tube is 0.5mm-1.0mm, and the inner diameter of the micropermeable tube is 0.4-0.6 times the outer diameter of the micropermeable tube.

[0021] Preferably, it also includes a fixing sticker;

[0022] The micropermeable tube also includes a bent section that can be bent and fit against the skin for liquid flow, and a fixation patch is used to fix the bent section to the skin.

[0023] Compared to the aforementioned background technology, the electrostimulation needle with a guide sheath provided by this utility model includes a needle body assembly, a guide sheath, a lead wire terminal, and a micropermeable tube. The needle body assembly includes a hollow needle tube and a needle seat located at the rear end of the needle tube. The front end of the needle tube is provided with a needle tip for puncture, and the needle seat is provided with an injection chamber communicating with the needle tube. The guide sheath is provided with a guide cavity for the guide sheath to be sleeved on the outer periphery of the needle tube. The end of the guide sheath away from the needle tip is detachably connected to the needle seat through a sheath seat. The lead wire terminal is connected to the rear end of the needle tube to transmit pulse current to the needle tip. The micropermeable tube is provided with a flow channel inside, and the micropermeable tube can pass through the guide cavity and move along the extension direction of the guide cavity.

[0024] Specifically, the guide sheath is detachably connected to the needle hub via the sheath seat, and the guide sheath is fitted onto the needle tube. After the needle tip punctures the skin and muscle layer, the combined use of ultrasound and pulsed current electrical stimulation allows the needle tip to reach the designated position, avoiding damage to blood vessels and nerves. The drug is injected through the injection chamber. Afterward, all components except the guide sheath and sheath seat are removed, and a micropermeable tube with internal flow channels is inserted into the guide chamber and moved along the extension direction of the guide chamber to a preset position. The guide sheath and sheath seat are removed, and the micropermeable tube is fixed to the skin surface with a fixation tape. The micropermeable tube is used for subsequent continuous drug injection. Compared with the guide sheath, the micropermeable tube has a smaller outer diameter, which can reduce or even avoid damage to surrounding tissues caused by the cannula. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the electrostimulation needle provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of the electrical stimulation needle provided in this embodiment of the present invention when an infusion catheter is installed;

[0028] Figure 3 This is a schematic diagram of the structure of the micropermeable tube and the guide sheath when they are combined, as provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure during disassembly of the guide sheath provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the sheath seat provided in an embodiment of the present utility model;

[0031] Figure 6 for Figure 5 A split sectional view;

[0032] Figure 7 A schematic diagram illustrating the removal process of the sheath seat provided in this embodiment of the utility model;

[0033] Figure 8 This is a schematic diagram of another sheath seat provided in an embodiment of the present invention;

[0034] Figure 9 This is a cross-sectional view of another sheath seat provided in an embodiment of the present utility model;

[0035] Figure 10 for Figure 9 A cross-sectional view of the structure with an infusion catheter installed.

[0036] Figure 11 for Figure 9 A split diagram;

[0037] Figure 12 A schematic diagram of the dismantling process of another sheath seat provided in an embodiment of this utility model;

[0038] Figure 13 This is a schematic diagram of the structure of the micropermeable tube fixed by a fixing adhesive according to an embodiment of the present invention.

[0039] in:

[0040] 01-Muscle layer, 02-Skin, 03-Nerve plexus;

[0041] 100 - syringe, 110 - needle tip;

[0042] 200 - Needle seat, 210 - Injection chamber, 220 - First protrusion;

[0043] 300-Guide sheath, 310-Guide cavity, 320-Gradual reduction structure, 330-Sheath seat, 331-First groove;

[0044] 400 - Wire terminal, 410 - Wire, 420 - Socket;

[0045] 500 - Micro-permeable tube, 510 - Connector, 520 - Side hole;

[0046] 600-Fixing Sticker;

[0047] 700 - Infusion catheter. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] In the description of this utility model, it should be understood that the terms "front" and "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0051] The purpose of this invention is to provide an electrostimulation needle with a guide sheath that can reduce or even avoid damage to surrounding tissues caused by the cannula.

[0052] Please see Figures 1 to 13 To achieve the above objectives, this utility model provides an electrostimulation needle with a guide sheath 300, including a needle body assembly, a guide sheath 300, a lead wire terminal 400, and a micropermeation tube 500.

[0053] The needle assembly includes a hollow needle tube 100 and a needle seat 200 located at the rear end of the needle tube 100. The front end of the needle tube 100 is provided with a needle tip 110 for puncture, and the needle seat 200 is provided with an injection chamber 210 connected to the needle tube 100.

[0054] It should be noted that the needle hub 200 is designed to facilitate manual control of the angle of the needle tube 100 and the depth of the needle tip 110. Specifically, by holding the needle hub 200, the needle tip 110 can be driven to pierce the skin 02 at a preset angle and pass through the muscle layer 01. By applying pressure to the needle hub 200, the depth of the needle tip 110 can be controlled. The needle hub 200 is usually connected to the rear end of the needle tube 100 so that the needle tube 100 has sufficient depth to meet the actual puncture needs.

[0055] The needle hub 200 has an injection chamber 210 at the end opposite to the needle tip 110. The injection chamber 210 is connected to the needle tube 100 so that the drug can enter the needle tube 100 along the injection chamber 210 and flow to the needle tip 110. The injection chamber 210 has a flared structure and is smoothly connected to the end of the needle tube 100 so that the drug can be injected after connecting to an external syringe. At the same time, it promotes the flow of the drug. The axis of the injection chamber 210 overlaps with the axis of the needle tube 100 so that the outlet of the syringe and the inlet of the needle tube 100 are in a straight line connection state, which accelerates the efficiency of drug injection and avoids drug atomization and adhesion caused by the drug spraying onto the cavity wall of the injection chamber 210.

[0056] In some embodiments, the syringe can be connected to the injection chamber 210 via the infusion catheter 700 so that after the drug flows along the infusion catheter 700 to the injection chamber 210, it continues to flow along the needle tube 100 to the needle tip 110. The infusion catheter 700 is flexible and its length is adjustable to improve the flexibility of the syringe when injecting drugs.

[0057] The guide sheath 300 is provided with a guide cavity 310, which is used for the guide sheath 300 to be sleeved on the outer periphery of the needle tube 100. The end of the guide sheath 300 away from the needle tip 110 is detachably connected to the needle seat 200 through the sheath seat 330. The sheath seat 330 is connected to the guide sheath 300 and the needle seat 200. With the setting of the guide cavity 310 and the needle seat 200 abutting against the sheath seat 330, the outer periphery of the needle tube 100 and the needle tube 100 are inserted into the skin 02 and muscle layer 01 as a whole for subsequent drug infiltration of the nerve plexus 03.

[0058] The lead terminal 400 is connected to the rear end of the needle tube 100 to transmit pulsed current to the needle tip 110. The lead terminal 400 is connected to the external socket 420 through the lead wire 410 to establish circuit connection. The target nerve is stimulated with low intensity and short duration by the electrical stimulation needle to obtain the required motor response (muscle twitching or abnormal sensory intensity) to determine the relative position of the needle tip 110 and the target nerve or nerve plexus 03. The lead terminal 400 can be set in the needle seat 200 to avoid contact between the operator and the lead terminal 400, thereby improving safety.

[0059] The micropermeable tube 500 has a flow channel inside, and the micropermeable tube 500 can pass through the guide cavity 310 and move along the extension direction of the guide cavity 310.

[0060] The outer diameter of the micropermeable tube 500 is smaller than the inner diameter of the guide cavity 310 so that the micropermeable tube 500 can be inserted into the guide cavity 310. The micropermeable tube 500 has a certain wall thickness or structural strength to ensure the movement of the micropermeable tube 500 in the guide cavity 310 and its short-distance movement after exiting the guide cavity 310.

[0061] The guide sheath 300 is detachably connected to the needle hub 200 via the sheath seat 330, and the guide sheath 300 is fitted onto the needle tube 100. After the needle tip 110 punctures the skin 02 and muscle layer 01, the needle tip 110 reaches the designated position under the combined stimulation of ultrasound and pulsed current, avoiding damage to blood vessels and nerves. The drug is injected through the injection chamber 210. Then, all components except the guide sheath 300 and the sheath seat 330 are removed. The micropermeable tube 500 with an internal flow channel is inserted into the guide chamber 310 and moved to the preset position along the extension direction of the guide chamber 310. The guide sheath 300 and the sheath seat 330 are removed, and the micropermeable tube 500 is fixed to the skin 02 surface with the fixing tape 600. The micropermeable tube 500 is used for the continuous injection of subsequent drugs. The micropermeable tube 500 has a smaller outer diameter than the guide sheath 300, which can reduce or even avoid damage to surrounding tissues caused by the cannula.

[0062] In this embodiment, the guide sheath 300 is provided with a tapered structure 320 at one end away from the needle seat 200. The tapered structure 320 includes a first end with a larger cross-sectional size and a second end with a smaller cross-sectional size. The distance between the second end and the needle tip 110 on the axis of the needle tube 100 is less than the distance between the first end and the needle tip 110 on the axis of the needle tube 100, and the end face of the second end is perpendicular to the axis of the needle tube 100.

[0063] Understandably, the distance between the end of the guide sheath 300 away from the needle hub 200 and the needle tip 110 is set to be small. The tapered structure 320 reduces the resistance of the guide sheath 300 during the puncture process of the needle tube 100, thereby improving the puncture efficiency of the guide sheath 300 and the needle tube 100. At the same time, the end face of the second end with a smaller cross-sectional size is perpendicular to the axis of the needle tube 100 so that the force on the second end is uniform. Furthermore, the edge of the end face of the second end can be set as a smooth structure to reduce the resistance of the guide sheath 300 moving with the needle tube 100.

[0064] The micropermeable tube 500 includes a third end that moves along the guide cavity 310 and a fourth end that is opposite to the third end. Typically, an opening for drug outflow is provided at the end of the third end. The third end is also provided with side holes 520. The side holes 520 can be uniformly arranged circumferentially along the wall of the micropermeable tube 500 and / or staggered axially along the wall of the micropermeable tube 500. By setting multiple side holes 520, the diffusion range of the drug after flowing to the third end can be increased, so as to achieve drug penetration and infiltration with minimal damage to the tissues around the puncture.

[0065] The fourth end is connected to a connector 510, which is connected to the flow channel for liquid flow. The axes of the fourth end and the connector 510 overlap, and the connector 510 and the fourth end are roughly in a straight line, so that the drug does not change its flow direction when it enters the fourth end along the connector 510, thus promoting the efficiency of drug flow.

[0066] It should be noted that the connection between the fourth end and the connector 510 can take many forms. For example, the connector 510 and the fourth end can be detachably connected to improve the flexibility of the application of the micropermeable tube 500 and the connector 510. At the same time, the connector 510 can be replaced according to different syringes or different usage needs.

[0067] In some embodiments, the guide sheath 300 is a transparent body, and the sheath wall of the guide sheath 300 is provided with multiple lines distributed along the axial direction of the guide sheath 300 for ultrasound imaging. The width of each line is less than 0.5 mm and is made of an X-ray opaque material. The needle tube 100 is provided with a first scale mark, and the micropermeation tube 500 is provided with a second scale mark.

[0068] Through the transparent guide sheath 300, the operator can observe the first scale mark set on the needle tube 100 to obtain the insertion depth of the needle tube 100 and the position of the needle tip 110. Then, the needle tube 100 and needle seat 200 are removed, and the micropermeation tube 500 is placed into the guide cavity 310 and moved along the extension direction of the guide cavity 310. The operator observes that the second scale mark is at the same depth as the first scale mark. When the second scale mark is at the same depth as the first scale mark, the third end of the micropermeation tube 500 has moved to the original position of the needle tip 110, thus improving the placement accuracy of the micropermeation tube 500.

[0069] The needle hub 200 has a first protrusion 220 through which the needle tube 100 passes, and the sheath seat 330 has a first groove 331 adapted to the first protrusion 220 to guide the sheath 300 and the needle tube 100 to be fixed relative to each other.

[0070] For example, the first protrusion 220 can be a frustum-shaped structure, and the frustum-shaped structure is located on the side of the needle seat 200 facing the needle tip 110. The first groove 331 is a groove with a frustum-shaped structure. The groove with the frustum-shaped structure is locked to the first protrusion 220 with the frustum-shaped structure, so that the guide sheath 300 and the needle tube 100 are relatively fixed. When it is necessary to remove the needle tube 100 and the needle seat 200, the needle tube 100 and the needle seat 200 can be pulled out in the opposite direction of puncture by fixing the sheath seat 330 and the guide sheath 300.

[0071] In some embodiments, to facilitate the removal of the guide sheath 300 after the micropermeable tube 500 is placed, the guide sheath 300 is a tearable sheath. Specifically, the guide sheath 300 is provided with a vulnerable portion extending along its own length direction. The vulnerable portion can be torn to allow the guide sheath 300 to detach radially from the micropermeable tube 500. Tear strips are also provided on both sides of the guide sheath 300 to reduce the force exerted by personnel when tearing the guide sheath 300, thereby reducing the impact on the micropermeable tube 500 during the tearing process.

[0072] The outer diameter of the micropermeable tube 500 is 0.5mm-1.0mm, and the inner diameter of the micropermeable tube 500 is 0.4-0.6 times the outer diameter of the micropermeable tube 500. The electrostimulation needle with the guide sheath 300 also includes a fixation patch 600. The micropermeable tube 500 also includes a bent section that can be bent and adhered to the skin 02 for liquid flow. The fixation patch 600 is used to fix the bent section to the skin 02.

[0073] After precise positioning, the needle tube 100 is removed, and a smaller diameter micro-permeable tube 500 is inserted through the guide cavity 310 of the guide sheath 300. Then, the guide sheath 300 is withdrawn from the body, leaving the smaller permeable tube to continuously infiltrate the micro-drug solution near the nerve block site, resulting in less damage to the body and precise drug delivery. The micro-permeable tube 500 is fixed to the skin surface 02. Because the micro-permeable tube 500 is a flexible tube, there is no bending or kinking problem caused by the indwelling connector 510. It is easy and firm to fix and will not shift due to poor fixation, making the infusion smoother.

[0074] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0076] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An electrical stimulation needle with a guiding sheath, characterized in that, include: The needle assembly includes a hollow needle tube (100) and a needle seat (200) disposed at the rear end of the needle tube (100). The front end of the needle tube (100) is provided with a needle tip (110) for puncture, and the needle seat (200) is provided with an injection chamber (210) communicating with the needle tube (100). The guide sheath (300) is provided with a guide cavity (310) for the guide sheath (300) to be sleeved on the outer periphery of the needle tube (100). The end of the guide sheath (300) away from the needle tip (110) is detachably connected to the needle seat (200) through the sheath seat (330). A lead terminal (400) is connected to the rear end of the needle tube (100) to transmit pulse current to the needle tip (110). The micropermeable tube (500) has a flow channel inside. The micropermeable tube (500) can pass through the guide cavity (310) and move along the extension direction of the guide cavity (310).

2. The electrostimulation needle with a guide sheath according to claim 1, characterized in that, The guide sheath (300) has a tapered structure (320) at one end away from the needle seat (200). The tapered structure (320) includes a first end with a larger cross-sectional dimension and a second end with a smaller cross-sectional dimension. The distance between the second end and the needle tip (110) on the axis of the needle tube (100) is less than the distance between the first end and the needle tip (110) on the axis of the needle tube (100), and the end face of the second end is perpendicular to the axis of the needle tube (100).

3. The electrostimulation needle with a guide sheath according to claim 1, characterized in that, The micropermeable tube (500) includes a third end that moves along the guide cavity (310) and a fourth end that is away from the third end. The third end is provided with a side hole (520), and the fourth end is connected to a connector (510). The connector (510) communicates with the flow channel for liquid flow, and the axes of the fourth end and the connector (510) overlap.

4. The electrostimulation needle with a guide sheath according to any one of claims 1 to 3, characterized in that, The guide sheath (300) is a transparent body, and the sheath wall of the guide sheath (300) is provided with multiple lines distributed along the axial direction of the guide sheath (300) for ultrasonic imaging; The syringe (100) is provided with a first graduation mark.

5. The electrostimulation needle with a guide sheath according to claim 4, characterized in that, The micropermeable tube (500) is equipped with a second scale marking.

6. The electrostimulation needle with a guide sheath according to claim 4, characterized in that, The needle hub (200) has a first protrusion (220) through which the needle tube (100) passes, and the sheath hub (330) has a first groove (331) adapted to the first protrusion (220) for fixing the guide sheath (300) and the needle tube (100) relative to each other.

7. The electrostimulation needle with a guide sheath according to claim 4, characterized in that, The guide sheath (300) is provided with a vulnerable portion extending along its own length, which can be torn to allow the guide sheath (300) to detach radially from the micropermeable tube (500).

8. The electrostimulation needle with a guide sheath according to claim 4, characterized in that, The axis of the injection chamber (210) overlaps with the axis of the needle tube (100).

9. The electrostimulation needle with a guide sheath according to claim 4, characterized in that, The outer diameter of the micropermeable tube (500) is 0.5mm-1.0mm, and the inner diameter of the micropermeable tube (500) is 0.4 times-0.6 times the outer diameter of the micropermeable tube (500).

10. The electrostimulation needle with a guide sheath according to claim 4, characterized in that, It also includes a fixing sticker (600); The micropermeable tube (500) also includes a bent section that can be bent and adhered to the skin (02) for liquid flow, and the fixing patch (600) is used to fix the bent section to the skin (02).

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