Spinal anesthesia catheter

Abstract

This utility model discloses a spinal-epidural anesthesia catheter, relating to the field of medical device technology; it includes a catheter, a central stent, and an expansion stent; the catheter includes a first segment and a second segment connected together; the first segment and the second segment are internally connected to form a drug inlet channel; a first drug outlet is opened on the outer side of the first segment, and a second drug outlet is opened on the outer side of the second segment; the first segment is used to enter the inner side of the dura mater, and the second segment is used to enter the outer side of the dura mater; the central stent is connected to the drug inlet channel; the expansion stent is connected to the drug inlet channel, one end of the expansion stent is connected to the central stent, and the other end of the expansion stent is connected to the inner wall of the catheter; the expansion stent can move relative to the central stent so that the wall of the catheter can expand or contract in the radial direction; multiple expansion stents are arranged along the circumference of the central stent to divide the drug inlet channel into multiple non-communicating chambers, and different medications are delivered to designated locations through their respective chambers.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a spinal-epidural anesthesia catheter. Background Technology

[0002] An anesthetic catheter is a thin, flexible tube used to deliver drugs to specific sites, such as the epidural space, during anesthesia or analgesia, or to monitor pressure. Traditionally, for epidural drug delivery, a cored epidural needle is inserted into the epidural space. The cored needle is then removed from the needle tube, and the catheter is inserted into the needle tube and advanced into the epidural space, reaching the spinal epidural area. The epidural needle is then withdrawn from the body and exited along the catheter, leaving the anesthetic catheter in place. To perform both subarachnoid anesthesia (spinal anesthesia) and epidural anesthesia simultaneously, subarachnoid anesthesia is usually only possible via a thin spinal needle before the catheter enters the epidural needle. However, once the catheter is inserted after a single anesthesia session, subarachnoid anesthesia cannot be performed again.

[0003] However, traditional anesthesia catheters can only reach the epidural space and are located on the outer side of the dura mater, unable to enter the inner side. This is because the diameter of anesthesia catheters is approximately 1 mm, while the dura mater contains fluid tissue. Larger diameter catheters are prone to causing leakage of this fluid tissue. Therefore, traditional anesthesia catheters with a diameter of about 1 mm have difficulty entering the inner side of the dura mater; they can only reach the outer side of the dura mater to deliver medication, and cannot deliver medication to the inner side of the dura mater or deliver different medications to the inner and outer sides of the dura mater. Simply reducing the radial size of the anesthesia catheter can easily create gaps between the wound and the catheter. Blood from damaged blood vessels during puncture can leak through these gaps, increasing the risk of bleeding. Furthermore, medication can easily leak through these gaps during administration. Reducing the radial size also narrows the drug delivery channel, resulting in insufficient drug delivery. If the catheter bends during insertion, it can easily become blocked, making it difficult to deliver the medication to the designated location. Therefore, a pressing technical problem is how to achieve a small-sized anesthesia catheter that can penetrate the inner dura mater to deliver different medications to the inner and outer sides of the dura mater, thereby increasing the drug delivery volume, while also effectively sealing the gap between the wound and the outer wall of the catheter to prevent bleeding and leakage. Utility Model Content

[0004] This invention provides a spinal-epidural anesthesia catheter to solve the problem of how to achieve both a small-sized anesthesia catheter and the ability to enter the inner side of the dura mater to deliver different medications on the inner and outer sides of the dura mater, thereby increasing the dosage and enabling simultaneous epidural and spinal anesthesia. Furthermore, it ensures a thorough seal between the wound and the outer wall of the anesthesia catheter to prevent bleeding and medication leakage.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A spinal-epidural anesthesia catheter includes a catheter, a central stent, and an dilatation stent;

[0007] The catheter includes a first tube segment and a second tube segment connected to each other; the first tube segment and the second tube segment are internally connected to form a drug delivery channel; a first drug outlet is opened on the outside of the first tube segment, and a second drug outlet is opened on the outside of the second tube segment; the first tube segment is used to enter the inner side of the dura mater, and the second tube segment is used to enter the outer side of the dura mater.

[0008] The central support is connected to the drug inlet channel, with one end of the central support extending into the first tube segment and the other end of the central support extending into the second tube segment;

[0009] The expansion stent is connected to the drug inlet channel. One end of the expansion stent is connected to the central stent, and the other end of the expansion stent is connected to the inner wall of the catheter. The expansion stent can move relative to the central stent so that the wall of the catheter can expand or contract in the radial direction. Multiple expansion stents are arranged along the circumference of the central stent to divide the drug inlet channel into multiple non-communicating chambers, and different drug solutions are delivered to the designated location through their respective chambers.

[0010] The central support has at least three expansion supports in the circumferential direction, so that the drug inlet channel is divided into at least three chambers along the circumferential direction of the catheter. One chamber is used to deliver the drug solution to the inner side of the dura mater through the first drug outlet of the first tube section, and the other two chambers are used to deliver the drug solution to the outer side of the dura mater through the second tube section.

[0011] The three expansion stents are spirally distributed along the extension direction of the central stent, or the three expansion stents are linearly distributed along the extension direction of the central stent.

[0012] The expansion bracket includes a support frame and a connecting membrane; multiple support frames are provided along the extension direction of the central bracket, and a connecting membrane is connected between two adjacent support frames. The connecting membrane is elastic, which allows the support frame to move relative to the central bracket.

[0013] The support frame includes a bracket and a support member; the bracket is arranged along the radial direction of the conduit, and the support member is arranged along the circumferential direction of the conduit. One end of the bracket is connected to the central bracket, and the other end of the bracket is connected to the support member. The support frame is used to connect with the inner wall of the conduit.

[0014] The support member adopts an arc-shaped connector with the same curvature as the conduit, so that multiple arc-shaped connectors form a ring structure along the circumference of the conduit.

[0015] The support includes multiple support frames, which are bent along the circumference of the conduit. One end of each support frame is connected to a support, and the other ends of each support frame are radially distributed around the support.

[0016] Multiple positioning posts are provided in the circumferential direction of the conduit between the first and second tube segments to limit the second tube segment and prevent it from entering the inner side of the dura mater.

[0017] The positioning post has a spherical or ellipsoidal structure and is located on the outer wall of the conduit.

[0018] The length of the first pipe segment is less than the length of the second pipe segment, and the radial dimension of the conduit gradually decreases from the second pipe segment to the first pipe segment.

[0019] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0020] 1. This application relates to a spinal-epidural anesthesia catheter, comprising a catheter, a central stent, and a dilatation stent; the catheter includes a first segment and a second segment connected to each other; the first segment and the second segment are internally connected to form a drug inlet channel; a first drug outlet is opened on the outer side of the first segment, and a second drug outlet is opened on the outer side of the second segment; the first segment is used to enter the inner side of the dura mater, and the second segment is used to enter the outer side of the dura mater; the central stent is connected within the drug inlet channel; the dilatation stent is connected within the drug inlet channel, one end of the dilatation stent is connected to the central stent, and the other end of the dilatation stent is connected to the inner wall of the catheter; the dilatation stent is movable relative to the central stent so that the wall of the catheter can expand or contract in the radial direction; multiple dilatation stents are arranged along the circumference of the central stent to divide the drug inlet channel into multiple non-communicating chambers, through which different medications are delivered to designated locations.

[0021] The central stent and dilatation stent are used to support the radial expansion and contraction of the catheter wall, allowing the catheter to switch between an expanded state and a contracted state relative to its initial state. This enables the radial dimension of the catheter wall to be adjusted according to the wound, thereby sealing the wound and preventing gaps between the wound and the catheter. This allows for timely closure of bleeding when blood vessels are damaged, and prevents leakage of medication through gaps between the wound and the catheter during drug delivery. Furthermore, the dilatation stent supports the catheter internally, increasing the internal space and further increasing the amount of medication delivered, thus improving delivery efficiency.

[0022] Furthermore, the central stent extends along the length of the catheter, and multiple expansion stents are connected circumferentially between the central stent and the catheter, dividing the catheter lumen into multiple independent chambers. Each independent chamber has a corresponding drug outlet, allowing the medication output from the head entering the dura mater to be separated from the medication output from the body of the catheter. Medication can be delivered directly to the head and into the inner dura mater through one independent chamber, while another medication can be delivered directly to the body and into the outer dura mater through another independent chamber. This allows medication to be transported to different sites, enabling the delivery of different medications with a single anesthesia catheter. This avoids the need for multiple anesthesia catheters to deliver different medications, reduces the number of incisions, minimizes patient suffering, and saves time.

[0023] 2. In a preferred embodiment of the present invention, at least three expansion supports are provided in the circumferential direction of the central support, so that the drug inlet channel is divided into at least three chambers along the circumferential direction of the catheter, one chamber being used to deliver drug solution to the inner side of the dura mater through the first drug outlet of the first tube section, and the other two chambers being used to deliver drug solution to the outer side of the dura mater through the second tube section.

[0024] The dilating stents divide the internal space of the catheter into multiple independent chambers along the circumference of the central stent. These stents are arranged spirally along the extension direction of the central stent; alternatively, they can be arranged linearly along the extension direction of the central stent. The spiral distribution of the stents on the outer side of the wire ensures that the stents are evenly distributed on multiple inner wall surfaces between the wire and the catheter wall. This increases the contact area between the stents and the wire, reduces abrupt stress, and strengthens the connection between the wire and the catheter. This allows the inner wall of the catheter to fully contact the wound under the action of the multiple dilating stents, sealing the gaps between the outer wall of the catheter and the wound from all directions, preventing bleeding and leakage of medication.

[0025] 3. In a preferred embodiment of the present invention, the expansion bracket includes a support frame and a connecting membrane; multiple support frames are provided along the extension direction of the central bracket, and a connecting membrane is connected between two adjacent support frames. The connecting membrane is extensible and allows the support frame to move relative to the central bracket.

[0026] When the support frame moves closer to the metal wire, the expansion support is in a contracted state, causing the catheter wall to fold and contract, thus reducing the radial dimension of the catheter. When the support frame moves away from the metal wire, the expansion support is in an expanded state, causing the catheter wall to expand, thus increasing the radial dimension of the catheter. A connecting membrane is connected between two adjacent support frames along the extension direction of the central support. The connecting membrane has extensibility and can not only divide the interior of the catheter into multiple independent chambers along the axial direction, but also further cooperate with the deformation of the support frame, allowing the support frame to move relative to the central support, i.e., the metal wire, thereby achieving adjustable catheter diameter.

[0027] 4. In a preferred embodiment of the present invention, the support frame includes a bracket and a support member; the bracket is arranged along the radial direction of the conduit, the support member is arranged along the circumferential direction of the conduit, one end of the bracket is connected to the central bracket, and the other end of the bracket is connected to the support member, and the support frame is used to connect with the inner wall of the conduit.

[0028] When the stent moves in contraction relative to the wire, it causes the catheter wall to fold inward under the support of the support, reducing the catheter's orifice diameter. Similarly, when the stent moves outward relative to the wire, it causes the catheter wall to expand outward, increasing the catheter's orifice diameter. When the stent contacts the wound, it can contract or expand relative to the wire according to the wound size, thus allowing for adjustable catheter orifice diameter.

[0029] 5. In a preferred embodiment of the present invention, a plurality of positioning posts are provided in the circumferential direction of the conduit between the first and second segments to limit the second segment and prevent it from entering the inner side of the dura mater.

[0030] When in use, the second tube section can remain outside the dura mater. After the first tube section extends into the dura mater, the positioning and limiting effect of the positioning post makes the tube body stuck outside the dura mater and will not enter the dura mater with the first tube section. This facilitates the separation of the drug solution between the first and second tube sections, enabling the delivery of different drug solutions to the inside or outside of the dura mater. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of a spinal-epidural anesthesia catheter according to one embodiment of this application;

[0033] Figure 2 This is a schematic diagram of a spinal-epidural anesthesia catheter reaching a 40% dilation state according to one embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the state of an expansion stent of a spinal-epidural anesthesia catheter reaching 40% expansion, according to one embodiment of this application.

[0035] Figure 4 This is a schematic diagram of a spinal-epidural anesthesia catheter reaching 60% dilation, according to one embodiment of this application.

[0036] Figure 5 This is a schematic diagram of the state of an expansion stent of a spinal-epidural anesthesia catheter reaching 60% expansion, according to one embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the structure of a spinal-epidural anesthesia catheter in its expanded state at maximum orifice, according to one embodiment of this application.

[0038] Figure 7 This is a schematic diagram of the expansion stent of a spinal-epidural anesthesia catheter in its expanded state at maximum orifice, according to one embodiment of this application.

[0039] Figure 8 This is a schematic diagram of the central stent and dilation stent of a spinal-epidural anesthesia catheter according to one embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the second drug outlet position of a spinal-epidural anesthesia catheter according to one embodiment of this application;

[0041] Figure 10 This is a schematic diagram of the first drug outlet position of a spinal-epidural anesthesia catheter according to one embodiment of this application;

[0042] In the picture,

[0043] 1. Catheter; 2. Central stent; 3. Dilatation stent; 31. Support frame; 311. Stent; 312. Support component; 32. Connecting membrane; 4. Head end; 5. Tail end; 6. Drug delivery channel; 7. First chamber; 8. Second chamber; 9. Third chamber; 10. First drug outlet; 11. Second drug outlet; 12. Positioning post. Detailed Implementation

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0045] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" 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 this invention. In this specification, the 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.

[0048] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0049] This utility model relates to a spinal-epidural anesthesia catheter, such as Figure 1-10 As shown, it includes catheter 1, central stent 2, and dilatation stent 3;

[0050] The catheter 1 includes a first tube segment and a second tube segment connected to each other; the first tube segment and the second tube segment are internally connected to form a drug delivery channel; a first drug outlet 10 is opened on the outside of the first tube segment, and a second drug outlet 11 is opened on the outside of the second tube segment; the first tube segment is used to enter the inner side of the dura mater, and the second tube segment is used to enter the outer side of the dura mater.

[0051] The central support 2 is connected to the drug inlet channel. One end of the central support 2 extends into the first pipe section, and the other end of the central support 2 extends into the second pipe section.

[0052] An expansion stent 3 is connected to the drug inlet channel. One end of the expansion stent 3 is connected to the central stent 2, and the other end of the expansion stent 3 is connected to the inner wall of the catheter 1. The expansion stent 3 can move relative to the central stent 2 so that the wall of the catheter 1 can expand or contract in the radial direction. Multiple expansion stents 3 are arranged along the circumference of the central stent 2 to divide the drug inlet channel into multiple non-communicating chambers, and different drug solutions are delivered to the designated position through their respective chambers.

[0053] The catheter 1 of this application serves as the main structure of the anesthesia catheter 1. The inner lumen of the catheter 1 forms a drug delivery channel 6. The catheter 1 is inserted into the human body, and medication is injected into the drug delivery channel 6 to deliver the drug to the designated administration site. In practical applications, an epidural needle with a liner is first inserted into the epidural needle tube, penetrating the epidural space under its influence. The epidural needle is then withdrawn from the tube, leaving it in the body. The catheter 1 is then inserted into the tube and enters the epidural space, reaching the dura mater. The head of the catheter 1 can further puncture the dura mater and smoothly enter its interior. Traditional anesthesia catheters 1 can only reach the epidural space and are located on the outer side of the dura mater. Because the diameter of the anesthesia catheter 1 is approximately 1 mm, its relatively large size makes it difficult to enter the dura mater, as the dura mater contains fluid tissue. Larger anesthesia catheters 1 are prone to causing leakage of fluid tissue inside the dura mater, so they usually cannot enter the inner side of the dura mater and can only reach the outer side of the dura mater to deliver drugs, thus failing to achieve drug delivery to the inner side of the dura mater. However, the head of the catheter 1 of this application can enter the inner side of the dura mater, while the body of the catheter can remain on the outer side of the dura mater. After the head is inserted into the dura mater, the positioning and limiting effect of the positioning post 12 causes the body of the catheter to be stuck on the outer side of the dura mater. When the staff feels the jamming during the insertion of the catheter 1 and observes the internal situation through the endoscope, they can promptly confirm whether the head has reached the correct installation position.

[0054] like Figure 1As shown, the dilatation stent 3 is connected inside the catheter 1. The dilatation stent 3 supports the catheter 1. Because the catheter 1 is made of a flexible material, it has extensibility. Therefore, the internal dilatation stent 3 can provide radial and axial support for the catheter 1. When the dilatation stent 3 expands outward, it can drive the catheter 1 to achieve a radial expansion state. When the dilatation stent 3 contracts inward, it can drive the catheter 1 to achieve a radial folding contraction state. This allows the radial dimension of the catheter 1 wall to be adjusted according to the wound, thereby sealing the wound and preventing gaps between the wound and the catheter 1. This allows for timely closure of bleeding when blood vessels are damaged. Furthermore, when delivering medication through the catheter 1, it prevents leakage of medication through gaps between the wound and the catheter 1. The dilatation stent 3 can also... The internal support of catheter 1 increases the internal space of catheter 1, thereby increasing the amount of medication delivered and improving delivery efficiency. More importantly, because the dilator stent 3 can form multiple independent chambers inside catheter 1, each independent chamber can deliver a separate medication. Different medications can be delivered to different locations. For example, one medication can be delivered directly to the head and into the inner dura mater through one independent chamber, while another medication can be delivered directly to the body of the catheter and into the outer dura mater through another independent chamber. This allows medications to be transported to different sites, enabling the delivery of different medications with a single anesthesia catheter 1. This avoids the need for multiple anesthesia catheters 1 to deliver different medications, reduces the number of incisions, reduces patient suffering, and saves time for surgery.

[0055] The central support 2 is made of metal wire; one end of the metal wire extends to the head end 4 of the head, and the other end extends to the tail end 5 of the tube body.

[0056] The central support 2 of this application uses a metal wire that extends from the head to the body of the catheter, from one side of the head end 4 to one side of the tail end 5 of the body, thus providing axial support for the catheter 1. The metal wire also has a strong memory function; after the catheter 1 has been coiled for a long time, it can return to a straight state under the strength of the metal wire, ensuring that the catheter 1 can smoothly enter the designated position in the epidural lumen.

[0057] In a preferred embodiment, at least three expansion stents 3 are provided in the circumferential direction of the central stent 2, so that the drug inlet channel is divided into at least three chambers along the circumferential direction of the catheter 1. One chamber is used to deliver drug solution to the inner side of the dura mater through the first drug outlet 10 of the first tube segment, and the other two chambers are used to deliver drug solution to the outer side of the dura mater through the second tube segment.

[0058] Furthermore, the three expansion stents 3 are spirally distributed along the extension direction of the central stent 2, or the three expansion stents 3 are linearly distributed along the extension direction of the central stent 2.

[0059] like Figure 2 , 4 As can be seen from points 6, 8, 9, and 10, the dilating stent 3 divides the internal space of the catheter 1 into multiple independent chambers along the circumferential direction of the central stent 2. The multiple dilating stents 3 are spirally distributed along the extension direction of the central stent 2; or, the multiple dilating stents 3 are linearly distributed along the extension direction of the central stent 2. The spiral distribution of the multiple dilating stents 3 on the outer side of the metal wire ensures that the dilating stents 3 are evenly distributed on multiple inner wall surfaces between the metal wire and the catheter wall. This increases the contact area between the dilating stents 3 and the metal wire, reduces abrupt stress, and thus enhances the connection strength between the metal wire and the catheter 1. This allows the inner wall of the catheter 1 to fully contact and connect with the wound under the action of the multiple dilating stents 3, sealing the gap between the outer wall surface of the catheter 1 and the wound from various directions, preventing bleeding and leakage of medication.

[0060] In this application, three expansion stents 3 are preferably used. These three expansion stents 3 are arranged in a straight line along the axis of the catheter 1, dividing the interior of the catheter 1 into three independent chambers, labeled as the first chamber 7, the second chamber 8, and the third chamber 9. The first chamber 7, the second chamber 8, and the third chamber 9 connect the tube body and the head, as shown below. Figure 9 and Figure 10 As shown, a first drug outlet 10 is provided on the head corresponding to the position of the first chamber 7, which can be used to deliver liquid medicine to the head, so that the liquid medicine is output to the inner side of the dura mater through the first drug outlet 10; a second drug outlet 11 is provided on the tube body corresponding to the positions of the second chamber 8 and the third chamber 9, which can be used to deliver liquid medicine to the tube body, so that the liquid medicine is output to the outer side of the dura mater through the second drug outlet 11; thereby realizing the delivery of different liquid medicines to different positions.

[0061] In a preferred embodiment, the expansion bracket 3 includes a support frame 31 and a connecting membrane 32; multiple support frames 31 are provided along the extension direction of the central bracket 2, and a connecting membrane 32 is connected between two adjacent support frames 31. The connecting membrane 32 is extensible and can make the support frame 31 move relative to the central bracket 2.

[0062] like Figure 2-10As shown, the support frame 31 is disposed between the metal wire and the inner wall of the catheter 1. The proximal end of the support frame 31 is connected to the metal wire, and the distal end of the support frame 31 is inclined relative to the metal wire and faces the tube body. This allows the support frame 31 to move relative to the metal wire under external influence when the catheter 1 is inserted into the human body. When the support frame 31 moves closer to the metal wire, the expansion support 3 is in a contracted state, thereby causing the tube wall of the catheter 1 to fold and contract, at which time the radial dimension of the catheter 1 decreases. When the support frame 31 moves away from the metal wire, the expansion support 3 is in an expanded state, thereby causing the tube wall of the catheter 1 to expand, at which time the radial dimension of the catheter 1 increases. A connecting membrane 32 is connected between two adjacent support frames 31 along the extension direction of the central support 2. The connecting membrane 32 has extensibility and can not only divide the interior of the catheter 1 into multiple independent chambers along the axial direction, but also further cooperate with the deformation of the support frame 31, so that the support frame 31 can move relative to the central support 2, i.e., the metal wire, thereby realizing the adjustable diameter of the catheter 1.

[0063] Furthermore, the support frame 31 includes a bracket 311 and a support member 312; the bracket 311 is arranged along the radial direction of the conduit 1, and the support member 312 is arranged along the circumferential direction of the conduit 1. One end of the bracket 311 is connected to the central bracket 2, and the other end of the bracket 311 is connected to the support member 312. The support frame 31 is used to connect with the inner wall of the conduit 1.

[0064] The support 311 is arranged along the radial direction of the conduit 1, and the support 312 is arranged along the circumferential direction of the conduit 1. The support 311 is inclined relative to the axis of the metal wire. The first end of the support 311 is connected to the metal wire, and the second end of the support 311 faces the tail end 5 of the conduit 1. In this way, the second end of the support 311 can move relative to the metal wire. It can move closer to the metal wire along the radial direction of the conduit 1 to realize the contraction movement of the support 311, or move away from the metal wire to realize the expansion movement of the support 311. The second end of the support 311 is connected to the support 312, and the other end of the support 312 is connected to the inner wall surface of the conduit 1.

[0065] Therefore, when the stent 311 moves in contraction relative to the metal wire, it can cause the wall of the catheter 1 to fold inward and contract under the action of the support 312, thus reducing the diameter of the catheter 1. Similarly, when the stent 311 moves outward relative to the metal wire, it can cause the wall of the catheter 1 to expand outward, thus increasing the diameter of the catheter 1. When the stent 311 contacts the wound, it can contract or expand relative to the metal wire according to the size of the wound, thereby making the diameter of the catheter 1 adjustable.

[0066] The support member 312 can adopt various structures, which are not limited to this application. The following are some possible implementation methods:

[0067] Implementation method 1: The support member 312 adopts an arc-shaped connector with the same curvature as the conduit 1, so that multiple arc-shaped connectors form a ring structure along the circumferential direction of the conduit 1.

[0068] Example 1: The arc-shaped connector includes a circular sheet, the curvature of which is adapted to the curvature of the conduit 1 to support the conduit 1 to open or close.

[0069] One side of the circular thin plate is used to connect with the inner wall of the catheter 1, and the other side of the circular thin plate is used to connect with the stent 311. The circular thin plate can increase the contact area with the inner wall of the catheter 1, thereby further increasing the support force of the stent 311 on the inner wall of the catheter 1. When the stent 311 moves closer to or further away from the metal wire, it can quickly grasp the wall of the catheter 1 through the circular thin plate, realizing the rapid contraction or expansion of the catheter 1. It can quickly adjust the contraction or expansion of the catheter 1 according to the size of the wound, improve the speed of sealing the gap, and reduce bleeding and leakage of medicine.

[0070] Example 2: The arc-shaped connector includes an arc-shaped rod, the curvature of which is adapted to the curvature of the conduit 1 to support the conduit 1 to open or close.

[0071] The arc-shaped rod is smaller than the radial dimension of the metal wire. The purpose of the arc-shaped rod having a slender structure with the same curvature as the conduit 1 is that when the conduit 1 expands to a cylindrical structure, that is, when it expands to its maximum diameter, the arc-shaped rod can fit tightly against the inner arc surface of the conduit 1, increasing the contact area between the arc-shaped rod and the conduit 1, and meeting the need for rapid expansion of the conduit 1.

[0072] Example 3: The arc-shaped connector includes an arc-shaped piece, the curvature of which is adapted to the curvature of the conduit 1 to support the conduit 1 to open or contract.

[0073] The arc-shaped connector adopts an arc-shaped plate structure. Compared with the arc-shaped rod in the second embodiment above, the width of the arc-shaped plate is increased. The purpose is to increase the contact area between the arc-shaped connector and the inner wall of the catheter 1. When the catheter 1 is expanded, more of the inner wall of the catheter 1 can be opened at the same time under the support of the arc-shaped connector, so that the gap between the catheter 1 and the wound can be quickly sealed, reducing the probability of bleeding and leakage of medicine.

[0074] Implementation method 2: The support member 312 includes multiple support frames 31, which are bent along the circumferential direction of the guide tube 1. One end of the multiple support frames 31 is connected to the bracket 311, and the other end of the multiple support frames 31 is radially distributed with the bracket 311 as the center.

[0075] One end of each support frame 31 is connected together and connected to the support 311. Multiple support frames 31 are radially distributed and connected to the inner wall of the catheter 1. The inner wall of the catheter 1 and the multiple support frames 31 form an umbrella-like structure. The purpose is to further enhance the contact area and connection strength between the support 312 and the catheter 1, so as to quickly support the inner wall of the catheter 1, realize the rapid expansion of the catheter 1, and enhance the sealing connection between the catheter 1 and the wound.

[0076] In a preferred embodiment, a plurality of positioning posts 12 are provided in the circumferential direction of the conduit 1 between the first and second tube segments to limit the second tube segment and prevent it from entering the inner side of the dura mater.

[0077] When in use, the second tube section can remain outside the dura mater. After the first tube section extends into the dura mater, the positioning and limiting effect of the positioning post 12 causes the tube body to be stuck outside the dura mater and will not enter the dura mater with the first tube section. This facilitates the separation of the drug solution between the first and second tube sections, enabling the delivery of different drug solutions to the inside or outside of the dura mater.

[0078] Furthermore, the positioning post 12 has a spherical or ellipsoidal structure and is located on the outer wall of the conduit 1. This makes the surface of the positioning post 12 smooth and without sharp edges, reducing resistance and facilitating the passage of the conduit 1.

[0079] Furthermore, the length of the first tube segment is shorter than the length of the second tube segment, and the radial dimension of the catheter 1 gradually decreases from the second tube segment to the first tube segment. This is to make the incision where the first tube segment extends into the inner side of the dura mater smaller, thus preventing leakage of fluid tissue between the first tube segment and the dura mater.

[0080] In addition, in order to enable timely observation of whether the head has entered the dura mater, a locking ring is connected inside the head, and an endoscope is connected inside the locking ring. The endoscope is an ultra-fine fiber endoscope with a diameter of less than 0.5 mm, which is used to examine whether the head of the catheter 1 has entered the dura mater.

[0081] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0082] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0083] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A spinal-epidural anesthesia catheter, characterized in that, Including catheters, central stents, and dilatation stents; The catheter includes a first tube segment and a second tube segment connected to each other; the first tube segment and the second tube segment are internally connected to form a drug delivery channel; a first drug outlet is opened on the outside of the first tube segment, and a second drug outlet is opened on the outside of the second tube segment; the first tube segment is used to enter the inner side of the dura mater, and the second tube segment is used to enter the outer side of the dura mater. The central support is connected to the drug inlet channel, with one end of the central support extending into the first tube segment and the other end of the central support extending into the second tube segment; The expansion stent is connected to the drug inlet channel. One end of the expansion stent is connected to the central stent, and the other end of the expansion stent is connected to the inner wall of the catheter. The expansion stent can move relative to the central stent so that the wall of the catheter can expand or contract in the radial direction. Multiple expansion stents are arranged along the circumference of the central stent to divide the drug inlet channel into multiple non-communicating chambers, and different drug solutions are delivered to the designated location through their respective chambers.

2. The spinal-epidural anesthesia catheter as described in claim 1, characterized in that, The central support has at least three expansion supports in the circumferential direction, so that the drug inlet channel is divided into at least three chambers along the circumferential direction of the catheter. One chamber is used to deliver the drug solution to the inner side of the dura mater through the first drug outlet of the first tube section, and the other two chambers are used to deliver the drug solution to the outer side of the dura mater through the second tube section.

3. The spinal-epidural anesthesia catheter as described in claim 2, characterized in that, The three expansion stents are spirally distributed along the extension direction of the central stent, or the three expansion stents are linearly distributed along the extension direction of the central stent.

4. The spinal-epidural anesthesia catheter as described in claim 2, characterized in that, The expansion bracket includes a support frame and a connecting membrane; multiple support frames are provided along the extension direction of the central bracket, and a connecting membrane is connected between two adjacent support frames. The connecting membrane is elastic, which allows the support frame to move relative to the central bracket.

5. The spinal-epidural anesthesia catheter as described in claim 4, characterized in that, The support frame includes a bracket and a support member; the bracket is arranged along the radial direction of the conduit, and the support member is arranged along the circumferential direction of the conduit. One end of the bracket is connected to the central bracket, and the other end of the bracket is connected to the support member. The support frame is used to connect with the inner wall of the conduit.

6. The spinal-epidural anesthesia catheter as described in claim 5, characterized in that, The support member adopts an arc-shaped connector with the same curvature as the conduit, so that multiple arc-shaped connectors form a ring structure along the circumference of the conduit.

7. The spinal-epidural anesthesia catheter as described in claim 5, characterized in that, The support includes multiple support frames, which are bent along the circumference of the conduit. One end of each support frame is connected to a support, and the other ends of each support frame are radially distributed around the support.

8. The spinal-epidural anesthesia catheter as described in claim 1, characterized in that, Multiple positioning posts are provided in the circumferential direction of the conduit between the first and second tube segments to limit the second tube segment and prevent it from entering the inner side of the dura mater.

9. The spinal-epidural anesthesia catheter as described in claim 8, characterized in that, The positioning post has a spherical or ellipsoidal structure and is located on the outer wall of the conduit.

10. The spinal-epidural anesthesia catheter as described in claim 1, characterized in that, The length of the first pipe segment is less than the length of the second pipe segment, and the radial dimension of the conduit gradually decreases from the second pipe segment to the first pipe segment.

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