Continuous spinal epidural anesthesia catheter

Abstract

The invention discloses a continuous spinal-epidural anesthesia catheter, and relates to the technical field of medical instruments, the continuous spinal-epidural anesthesia catheter comprises a catheter body and a flexible support frame body arranged in the catheter body, the catheter body comprises a head part and a catheter body part; a plurality of bulges are connected between the head part in the circumferential direction of the catheter body and the catheter body part so as to limit the head part extending into the dura mater; the flexible supporting frame body is used for supporting the catheter wall of the catheter body to be contracted and contracted in the radial direction, so that the catheter body can be converted between an expansion state relative to the initial state and a contraction state relative to the initial state; the flexible support frame body comprises a central frame body and a plurality of support frame bodies; the center frame body extends in the length direction of the catheter body, the multiple supporting frame bodies are connected between the center frame body and the catheter body in the circumferential direction of the center frame body and can divide an inner cavity of the catheter body into multiple independent cavities, and each independent cavity is provided with a corresponding medicine outlet. And the liquid medicine output by the head part entering the dura mater and the liquid medicine output by the tube body part are shunted.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and specifically relates to a continuous spinal-epidural anesthesia catheter. Background Art

[0002] An anesthesia catheter is a thin, flexible tube used to deliver drugs to specific locations, such as the epidural space, during anesthesia or analgesia. Traditionally, when delivering drugs to the epidural space, an epidural needle with a liner is first inserted into the epidural space of the human body. The liner in the epidural needle is then withdrawn from the epidural needle tube. The catheter is then inserted into the epidural needle tube and enters the epidural space to reach the epidural spinal space. The epidural needle is then pulled out of the body and withdrawn along the catheter, leaving the anesthesia catheter in the body. If you want to perform subarachnoid anesthesia (spinal anesthesia) and epidural anesthesia at the same time, you can usually only perform subarachnoid anesthesia through a thin spinal anesthesia needle before the anesthesia catheter enters the epidural needle. However, once the anesthesia catheter is inserted after a single anesthesia, subarachnoid anesthesia cannot be performed again.

[0003] However, traditional anesthesia catheters can only reach the epidural space and are located on the outside of the dura mater, and cannot enter the inner dura mater (subarachnoid space). This is because the diameter of the anesthesia catheter is approximately 1 mm, and there is fluid tissue inside the dura mater. Anesthesia catheters with larger diameters are prone to leakage of fluid tissue inside the dura mater. Therefore, traditional anesthesia catheters with a diameter of about 1 mm have difficulty entering the inner dura mater and can only reach the outer side of the dura mater to deliver drugs. It is impossible to deliver drugs inside the dura mater, nor can it deliver different drugs to the inner and outer sides of the dura mater. If the radial dimension of the anesthesia catheter is simply reduced, a gap will easily appear between the wound and the anesthesia catheter. Blood flowing out of the damaged blood vessels during the puncture process will flow out through this gap, thereby increasing the bleeding point. In addition, the drug solution is also likely to leak from the gap during the administration of the drug through the anesthesia catheter. In addition, reducing the radial dimension of the anesthesia catheter will also cause the drug delivery channel to shrink, and the amount of drug delivered will be insufficient. If the catheter bends during the process of being inserted into the human body, it will easily block the catheter and make it difficult to deliver the drug to the designated location. Therefore, how to achieve a small-sized anesthesia catheter that can enter the inner side of the dura mater so that different drug solutions can be transmitted on the inner and outer sides of the dura mater to increase the amount of drug, and fully seal the gap between the wound and the outer wall of the anesthesia catheter to prevent bleeding and leakage of drug solution, is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present application provides a continuous spinal-epidural anesthesia catheter to solve the above-mentioned technical problem of how to achieve a small-sized anesthesia catheter that can enter the inner side of the dura mater so that different drug solutions can be transmitted on the inner and outer sides of the dura mater, thereby increasing the drug dosage, being able to perform epidural anesthesia and spinal anesthesia at the same time, and fully sealing the gap between the wound and the outer wall of the anesthesia catheter to prevent bleeding and leakage of drug solutions.

[0005] The technical solutions adopted in this application are:

[0006] A continuous spinal anesthesia catheter, comprising a catheter body and a flexible support frame arranged in the catheter body:

[0007] The catheter body includes a head and a body; a plurality of protrusions are connected between the head and the body along the circumference of the catheter body to limit the position of the head extending into the dura mater;

[0008] The flexible support frame is used to support the wall of the catheter body to expand and contract in the radial direction, so that the catheter body can be transformed between an expanded state relative to the initial state and a contracted state relative to the initial state;

[0009] The flexible support frame includes a central frame and multiple support frames; the central frame extends along the length direction of the catheter body; the multiple support frames are connected between the central frame and the catheter body along the circumference of the central frame, and can divide the catheter body cavity into multiple independent chambers, each independent chamber is provided with a corresponding drug outlet, so that the drug liquid output from the head part entering the dura mater is separated from the drug liquid output from the tube body.

[0010] The central frame is made of metal wire; one end of the metal wire extends to the head end of the head and is connected to the inner wall of the head, and the other end extends to the tail end of the tube body and is connected to the inner wall of the tube body; or, one end of the metal wire is in a pen-tip structure extending beyond the head end of the head by a preset distance, and a filler is filled between the outer peripheral surface of the part of the metal wire extending beyond the head end and the outer wall surface of the head; the other end of the metal wire extends to the tail end of the tube body and is connected to the inner wall of the tube body.

[0011] The support frame includes a plurality of support components arranged along the circumferential direction of the central frame, and the support components separate the central frame into a plurality of independent chambers in the circumferential direction.

[0012] The support assembly includes support wires and connecting films; a plurality of support wires are provided along the extension direction of the central frame, and a connecting film is connected between two adjacent support wires along the extension direction.

[0013] The connecting film is stretchable so that two adjacent supporting wires can move relative to the central frame.

[0014] The support wire includes a screw rod and a connector connected to each other; the screw rod extends along the radial direction of the catheter body, the connector extends along the circumferential direction of the catheter body, one end of the screw rod is connected to the metal wire, and one side of the connector is connected to the inner wall of the catheter body.

[0015] The connecting member includes a circular thin sheet, the curvature of the circular thin sheet is adapted to the curvature of the catheter body to support the expansion or contraction of the catheter body; or, the connecting member includes an arc-shaped rod, the curvature of the arc-shaped rod is adapted to the curvature of the catheter body to support the expansion or contraction of the catheter body; or, the connecting member includes an arc-shaped sheet, the curvature of the arc-shaped sheet is adapted to the curvature of the catheter body to support the expansion or contraction of the catheter body.

[0016] The connecting member further comprises a plurality of connecting wires, which are radially connected to the side of the circular sheet, arc-shaped rod or arc-shaped sheet facing the screw rod, and one end of the plurality of connecting wires is connected to the screw rod.

[0017] The plurality of support components are distributed in a spiral manner along the extension direction of the central frame; or the plurality of support components are distributed in a straight line along the extension direction of the central frame.

[0018] The outer diameter of the catheter body gradually increases from the head to the tube body; a locking ring is also connected to the head, and an endoscope is connected to the locking ring. The endoscope uses an ultra-fine fiber endoscope with a diameter of less than 0.5mm to peek into whether the head of the catheter body enters the dura mater.

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

[0020] 1. A continuous spinal epidural anesthesia catheter of the present application comprises a catheter body and a flexible support frame disposed within the catheter body; the flexible support frame is configured to support a tube wall of the catheter body and to expand and contract radially so that the catheter body can switch between an expanded state relative to an initial state and a contracted state relative to the initial state, thereby adjusting the radial dimension of the tube wall of the catheter body according to the wound to achieve sealing of the wound and prevent a gap between the wound and the catheter body. This can then promptly stop bleeding when a blood vessel is damaged, and prevent leakage of the drug solution through the gap between the wound and the catheter body when delivering drugs through the catheter body. Furthermore, the flexible support frame can support the catheter body within the catheter body, thereby increasing the space within the catheter body, further increasing the drug delivery capacity of the catheter body, and improving drug delivery efficiency.

[0021] In addition, the flexible support frame includes a central frame and multiple support frames; the central frame extends along the length direction of the catheter body, and the multiple support frames are connected between the central frame and the catheter body along the circumference of the central frame, which can divide the inner cavity of the catheter body into multiple independent chambers, and each independent chamber is provided with a corresponding drug outlet, so that the drug liquid output from the head entering the dura mater and the drug liquid output from the tube body can be diverted; the drug liquid can be directly delivered to the head through a certain independent chamber to enter the inner side of the dura mater, while another drug liquid can be directly delivered to the tube body through another independent chamber to enter the outer side of the dura mater, so that the drug liquid can be transported to different parts separately, realizing one anesthesia catheter to transport drug liquids of different components, avoiding the use of multiple anesthesia catheters to deliver different drug liquids separately, reducing the number of wounds, which can not only reduce the patient's pain but also save time.

[0022] 2. As an embodiment of the present application, the central frame is made of metal wire; one end of the metal wire extends to the head end of the head and is connected to the inner wall of the head, and the other end extends to the tail end of the tube body and is connected to the inner wall of the tube body; or, one end of the metal wire is in a pen tip structure extending beyond the head end of the head by a preset distance, and a filler is filled between the outer peripheral surface of the part of the metal wire extending beyond the head end and the outer wall surface of the head; the other end of the metal wire extends to the tail end of the tube body and is connected to the inner wall of the tube body.

[0023] The central frame is made of metal wire, which also has a strong memory function. After the catheter body has been curled for a long time, it can be restored to a straight state under the strength of the metal wire, ensuring that the catheter body can smoothly enter the designated position in the epidural space.

[0024] There are two ways to lay the metal wire. The first is that the metal wire extends from the head to the tube body, and from the head end side of the head to the tail end side of the tube body, to achieve support for the axial direction of the catheter body; the second is that the head of the metal wire can be set to protrude outward from the catheter body and have a pen-tip tip. The purpose of this setting is to pierce the dura mater with the smallest possible incision, and insert the catheter on the basis of the small incision to gradually expand the incision. This setting can allow the incision in the dura mater to shrink and recover faster after the catheter exits the dura mater, preventing the cerebrospinal fluid inside the dura mater from flowing out through the incision.

[0025] 3. As a preferred embodiment of the present application, the support frame includes a plurality of support components arranged along the circumferential direction of the central frame, and the support components separate the central frame into a plurality of independent chambers in the circumferential direction.

[0026] The support components divide the interior space of the catheter body into multiple independent chambers along the circumferential direction of the central frame. The multiple support components are distributed in a spiral pattern along the extension direction of the central frame; alternatively, the multiple support components are distributed in a straight line along the extension direction of the central frame. The multiple support components are distributed in a spiral pattern on the outside of the metal wire, so that the support components are evenly distributed on multiple inner wall surfaces between the metal wire and the tube wall. This increases the contact area between the support components and the metal wire, reduces sudden stress, and thus enhances the connection strength between the metal wire and the catheter body. The multiple support components enable the inner wall of the catheter body to fully abut and connect with the wound, thereby blocking the gap between the outer wall of the catheter body and the wound from all directions of the catheter body, preventing bleeding and leakage of liquid medicine.

[0027] 4. As a preferred embodiment of the present application, the support assembly includes a support wire and a connecting film; a plurality of support wires are arranged along the extension direction of the central frame, and a connecting film is connected between two adjacent support wires along the extension direction.

[0028] When the support wire moves away from the metal wire, the support assembly as a whole is in an expanded state, thereby driving the wall of the catheter body to expand, and the radial size of the catheter body increases. A connecting film is connected between two adjacent support wires along the extension direction of the central frame. The connecting film has a retractable property, which can not only divide the interior of the catheter body into multiple independent chambers along the axial direction, but also further cooperate with the deformation of the support wire, so that the support wire can move relative to the central frame, that is, the metal wire, and then realize the adjustable aperture of the catheter body.

[0029] 5. As a preferred embodiment of the present application, the support wire includes a screw rod and a connecting piece connected to each other; the screw rod extends along the radial direction of the catheter body, the connecting piece extends along the circumferential direction of the catheter body, one end of the screw rod is connected to the metal wire, and one side of the connecting piece is connected to the inner wall of the catheter body.

[0030] When the lead screw moves toward the wire, the connector causes the catheter wall to fold inward, shrinking the catheter's aperture. Similarly, when the lead screw moves away from the wire, the lead screw causes the catheter wall to expand outward, increasing the catheter's aperture. When the lead screw contacts a wound, it contracts or expands relative to the wire according to the size of the wound, thereby achieving adjustable catheter aperture size. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

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

[0033] Figure 2 This is a schematic structural diagram of a continuous spinal-epidural anesthesia catheter according to another embodiment of the present application;

[0034] Figure 3 This is a schematic structural diagram of a continuous spinal epidural anesthesia catheter in an embodiment of the present application in a 40% expanded state;

[0035] Figure 4 This is a schematic diagram of a flexible support frame of a continuous spinal epidural anesthesia catheter in an embodiment of the present application, when the flexible support frame reaches a 40% expansion state;

[0036] Figure 5 This is a schematic structural diagram of a continuous spinal epidural anesthesia catheter in an embodiment of the present application, in a state where the catheter has reached 60% expansion;

[0037] Figure 6 This is a schematic diagram of a flexible support frame of a continuous spinal epidural anesthesia catheter in an embodiment of the present application, when the flexible support frame reaches a 60% expansion state;

[0038] Figure 7 This is a schematic structural diagram of a continuous spinal epidural anesthesia catheter in an expanded state with a maximum aperture according to an embodiment of the present application;

[0039] Figure 8 This is a schematic diagram of a flexible support frame of a continuous spinal epidural anesthesia catheter in an expanded state with a maximum aperture according to an embodiment of the present application;

[0040] Figure 9 This is a schematic structural diagram of a flexible support frame for a continuous spinal epidural anesthesia catheter according to one embodiment of the present application;

[0041] Figure 10 This is a structural schematic diagram of the position of the second drug outlet of a continuous spinal epidural anesthesia catheter according to one embodiment of the present application;

[0042] Figure 11 This is a structural schematic diagram of the position of the first drug outlet of a continuous spinal epidural anesthesia catheter according to one embodiment of the present application;

[0043] In the figure,

[0044] 1. Catheter body; 2. Center frame; 3. Support frame; 31. Support assembly; 311. Screw rod; 312. Connector; 4. Head end; 5. Tail end; 6. Medicine cavity channel; 7. First chamber; 8. Second chamber; 9. Third chamber; 10. First medicine outlet; 11. Second medicine outlet; 12. Protrusion; 13. Filler. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0047] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0048] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the reference terms "implementation method", "embodiment", "one embodiment", "example" or "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0050] The present application also relates to a continuous spinal anesthesia catheter, such as Figure 1-11 As shown, it includes a catheter body 1 and a flexible support frame 3 arranged in the catheter body 1:

[0051] The catheter body 1 comprises a head and a body; the head is shorter than the body, and the radial dimension of the catheter body 1 gradually decreases from the body to the head, so that the incision made by the head into the inner side of the dura mater is smaller, thereby preventing fluid and tissue from leaking between the head and the dura mater. A plurality of protrusions 12 are connected between the head and the body along the circumference of the catheter body 1 to limit the position of the head when it enters the dura mater.

[0052] The flexible support frame 3 is used to support the wall of the catheter body 1 to expand and contract in the radial direction, so that the catheter body 1 can be transformed between an expanded state relative to the initial state and a contracted state relative to the initial state;

[0053] The flexible support frame 3 includes a central frame 2 and multiple support frames 3; the central frame 2 extends along the length direction of the catheter body 1; the multiple support frames 3 are mainly connected to the tube body part, and are connected between the central frame 2 and the catheter body 1 along the circumference of the central frame 2, which can divide the inner cavity of the catheter body 1 into multiple independent chambers, and each independent chamber is provided with a corresponding drug outlet, so that the drug liquid output from the head entering the dura mater is diverted from the drug liquid output from the tube body part.

[0054] The catheter body 1 of the present application serves as the main structure of the anesthesia catheter. The inner cavity of the catheter body 1 forms a drug cavity channel 6 for drug delivery. The catheter body 1 is extended into the human body, and drugs are injected into the drug cavity channel 6 of the catheter body 1 to achieve drug delivery to the designated drug delivery position of the human body. In actual application, the epidural needle with a liner is first inserted into the epidural needle tube. Under the action of the epidural needle, it penetrates into the epidural cavity of the human body. Then the epidural needle is withdrawn from the epidural needle tube, and the epidural needle tube remains in the human body. Then the catheter body 1 is inserted into the epidural needle tube and enters the epidural cavity to reach the dura mater. The head of the catheter body 1 can continue to pierce the dura mater and smoothly enter the inside of the dura mater. Traditional anesthesia catheters can only reach the epidural cavity and are located on the outside of the dura mater. Since the diameter of the anesthesia catheter is about 1 mm, it is relatively large and difficult to enter the inside of the dura mater because there is liquid tissue inside the dura mater. The diameter of the catheter is about 1 mm. Larger anesthesia catheters are prone to causing leakage of liquid tissue inside the dura mater, and therefore usually cannot enter the inner side of the dura mater and can only reach the outer side of the dura mater to deliver medicine, and cannot achieve drug delivery inside the dura mater. The head of the catheter body 1 of the present application can enter the inner side of the dura mater, and the tube body can stay on the outer side of the dura mater. After the head is inserted into the dura mater, the positioning and limiting effect of the protrusion 12 causes the tube body to be stuck on the outer side of the dura mater. When the staff feels a jam during the process of inserting the catheter body 1 and observes the internal situation through an endoscope, they can promptly confirm whether the head has reached the correct installation position.

[0055] like Figure 1 As shown, the flexible support frame 3 is connected to the inside of the catheter body 1, and the flexible support frame 3 can support the catheter body 1. Since the catheter body 1 is made of flexible material, it has retractable properties. Therefore, the flexible support frame 3 inside can support the catheter body 1 in radial and axial directions. When the flexible support frame 3 expands outward, it can drive the catheter body 1 to achieve a radial expansion state. When the flexible support frame 3 contracts inward, it can drive the catheter body 1 to achieve a radial folding and contraction state, so that the radial size of the catheter wall of the catheter body 1 can be adjusted according to the wound to achieve sealing of the wound, prevent the wound and the catheter body 1 from having a gap, and then can stop bleeding in time when a blood vessel is damaged, and can prevent the drug solution from leaking through the gap between the wound and the catheter body 1 when delivering the drug through the catheter body 1. The flexible support frame 3 can support the catheter body 1 inside the catheter body 1, so that the space inside the catheter body 1 is increased, the drug delivery amount of the catheter body 1 is further increased, and the drug delivery efficiency is improved. Moreover, the most important thing is that the flexible support frame 3 can form multiple independent chambers inside the catheter body 1, so that each independent chamber can transport a separate drug solution, and different drug solutions can be delivered to different locations. For example, the drug solution can be directly delivered to the head through an independent chamber and enter the inner side of the dura mater, while another drug solution can be directly delivered to the tube body through another independent chamber and enter the outer side of the dura mater, so that the drug solutions can be transported to different parts separately, realizing one anesthesia catheter to transport drug solutions of different components, avoiding the use of multiple anesthesia catheters to transport different drug solutions separately, reducing the number of wounds, which can not only reduce the patient's pain, but also save time for surgery.

[0056] As a preferred embodiment, the central frame 2 is made of metal wire. Further, two embodiments are adopted for the layout of the metal wire, as follows:

[0057] Implementation method 1: Figure 1 As shown, one end of the metal wire extends to the head end 4 of the head and is connected to the inner wall of the head, and the other end extends to the tail end 5 of the tube body and is connected to the inner wall of the tube body.

[0058] The central frame 2 of the present application is constructed of a metal wire, extending from the head portion to the body portion, and from the head end 4 to the body end 5, providing axial support for the catheter body 1. The metal wire also has a strong memory function, allowing the catheter body 1 to return to a straight state after being curled for an extended period due to the strength of the wire, ensuring smooth entry of the catheter body 1 into the designated epidural space.

[0059] Implementation method 2: Figure 2As shown, one end of the metal wire is in a pen-tip structure extending beyond the head end 4 of the head by a preset distance, and a filler 13 is filled between the outer peripheral surface of the metal wire extending beyond the head end 4 and the outer wall surface of the head; the other end of the metal wire extends to the tail end 5 of the tube body and is connected to the inner wall of the tube body.

[0060] The wire head can be configured to protrude outward from the catheter body and have a pen-tip tip. The purpose of this configuration is to pierce the dura mater with as small an incision as possible, and insert the catheter based on the small incision to gradually expand the incision. This configuration allows the incision in the dura mater to shrink and recover faster after the catheter exits the dura mater, thereby preventing a large amount of cerebrospinal fluid inside the dura mater from flowing out through the incision.

[0061] As a preferred embodiment, the support frame 3 includes a plurality of support components 31 arranged along the circumferential direction of the central frame 2 , and the support components 31 separate the central frame 2 into a plurality of independent chambers in the circumferential direction.

[0062] like Figure 3 、 5 As can be seen from Figures 7, 9, 10, and 11, the support frame 3 is preferably arranged inside the tube body. The purpose of such arrangement is that the support components 31 divide the internal space of the catheter body 1 into multiple independent chambers along the circumferential direction of the central frame 2. The multiple support components 31 are distributed in a spiral shape along the extension direction of the central frame 2; or, the multiple support components 31 are distributed in a straight line along the extension direction of the central frame 2. The multiple support components 31 are distributed in a spiral shape on the outside of the metal wire, so that the support components 31 are evenly distributed on multiple inner wall surfaces between the metal wire and the tube wall, thereby increasing the contact area between the support components 31 and the metal wire, reducing sudden stress, and thus enhancing the connection strength between the metal wire and the catheter body 1. The inner wall of the catheter body 1 can be fully abutted and connected with the wound under the action of the multiple support components 31, thereby blocking the gap between the outer wall surface of the catheter body 1 and the wound from all directions of the catheter body 1 to prevent bleeding and leakage of liquid medicine.

[0063] In the present application, three support assemblies 31 are preferably used. The three support assemblies 31 are arranged in a straight line along the axis of the catheter body 1, and the interior of the catheter body 1 is divided into three independent chambers, which are marked 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 communicate with the tube body and the head. Figure 10 and Figure 11As shown, a first drug outlet 10 is opened at a position on the head corresponding to the first chamber 7, and the first chamber 7 can be used to transport 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 opened at a position on the tube body corresponding to the second chamber 8 and the third chamber 9, and the second chamber 8 and the third chamber 9 are used to transport 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 achieving the delivery of different liquid medicines to different positions.

[0064] Furthermore, the support assembly 31 includes a support wire and a connecting film; a plurality of support wires are provided along the extension direction of the central frame 2, and a connecting film is connected between two adjacent support wires along the extension direction.

[0065] like Figure 3-11 As shown, the support wire is arranged between the metal wire and the inner wall of the catheter body 1, the proximal end of the support wire is connected to the metal wire, and the distal end of the support wire is inclined relative to the metal wire and toward the tube body, so that when the catheter body 1 is inserted into the human body, the support wire can move relative to the metal wire under the action of the outside world. When the support wire moves closer to the metal wire, the support assembly 31 is in a contracted state as a whole, thereby driving the tube wall of the catheter body 1 to fold and contract, and at this time the radial size of the catheter body 1 is reduced; when the support wire moves away from the metal wire, the support assembly 31 is in an expanded state as a whole, thereby driving the tube wall of the catheter body 1 to expand and expand, and at this time the radial size of the catheter body 1 is increased; a connecting film is connected between two adjacent support wires along the extension direction of the central frame 2. The connecting film has a retractable property, which can not only divide the interior of the catheter body 1 into multiple independent chambers along the axial direction, but also can further cooperate with the deformation of the support wire, so that the support wire can move relative to the central frame 2, that is, the metal wire, and then realize the adjustable aperture of the catheter body 1.

[0066] As a preferred embodiment, the support wire includes a connected screw rod 311 and a connector 312; the screw rod 311 extends along the radial direction of the catheter body 1, and the connector 312 extends along the circumferential direction of the catheter body 1. One end of the screw rod 311 is connected to the metal wire, and one side of the connector 312 is connected to the inner wall of the catheter body 1.

[0067] The screw rod 311 is arranged along the radial direction of the catheter body 1, and the connecting piece 312 is arranged along the circumferential direction of the catheter body 1. The screw rod 311 is inclined relative to the axial direction of the metal wire; the first end of the screw rod 311 is connected to the metal wire, and the second end of the screw rod 311 is toward the tail end 5 of the catheter body 1, so that the second end of the screw rod 311 can move relative to the metal wire, and can move along the radial direction of the catheter body 1 close to the metal wire to realize the contraction movement of the screw rod 311, or move away from the metal wire to realize the expansion movement of the screw rod 311. The second end of the screw rod 311 is connected to the connecting piece 312, and the other end of the connecting piece 312 is connected to the inner wall surface of the catheter body 1.

[0068] Therefore, when the screw rod 311 moves toward the metal wire, it can cause the wall of the catheter body 1 to fold inward under the action of the connecting member 312, thereby reducing the aperture of the catheter body 1. Similarly, when the screw rod 311 moves away from the metal wire, it can cause the wall of the catheter body 1 to expand outward under the action of the screw rod 311, thereby increasing the aperture of the catheter body 1. When the screw rod 311 contacts the wound, it can move relative to the metal wire to contract or expand according to the size of the wound, thereby achieving adjustable aperture size of the catheter body 1.

[0069] The structural form of the connecting member 312 is not limited by the present application, and the following embodiments may be adopted:

[0070] Embodiment 1: The connecting member 312 includes a circular thin sheet, the curvature of which matches the curvature of the catheter body 1 to support the catheter body 1 to expand or contract.

[0071] One side of the circular sheet is used to connect with the inner wall of the catheter body 1, and the other side of the circular sheet is used to connect with the screw rod 311. The circular sheet can increase the contact area with the inner wall of the catheter body 1, thereby further increasing the support strength of the screw rod 311 on the inner wall of the catheter body 1, so that when the screw rod 311 moves closer to or away from the metal wire, the wall of the catheter body 1 can be quickly grasped through the circular sheet, realizing the rapid contraction or expansion movement of the catheter body 1, and can quickly adjust the catheter body 1 to contract or expand according to the size of the wound, thereby increasing the speed of sealing the gap and reducing bleeding and leakage of the drug solution.

[0072] Embodiment 2: The connecting member 312 includes an arc-shaped rod, the curvature of the arc-shaped rod is adapted to the curvature of the catheter body 1 , so as to support the catheter body 1 to expand or contract.

[0073] The size of the arc rod is smaller than the radial size of the metal wire. The purpose of the arc rod adopting a slender structure with the same curvature as the catheter body 1 is that when the catheter body 1 expands to a cylindrical structure, that is, when it expands to the maximum diameter state, the arc rod can fit tightly with the inner arc surface of the catheter body 1, thereby increasing the contact area between the arc rod and the catheter body 1 and meeting the rapid expansion needs of the catheter body 1.

[0074] Embodiment 3: The connecting member 312 includes an arc-shaped piece, the curvature of the arc-shaped piece is adapted to the curvature of the catheter body 1 , so as to support the catheter body 1 to expand or contract.

[0075] The connecting piece 312 adopts the structure of an arc-shaped piece. The width direction of the arc-shaped piece is increased compared to the arc-shaped rod in the above-mentioned embodiment 2. The purpose is to increase the contact area between the connecting piece 312 and the inner wall of the catheter body 1, so that when the catheter body 1 is expanded, more inner walls of the catheter body 1 can be stretched at the same time under the support of the connecting piece 312, so that the gap between the catheter body 1 and the wound is quickly blocked, reducing the probability of bleeding and leakage of liquid medicine.

[0076] Embodiment 4: The connecting member 312 further includes a plurality of connecting wires, which are radially connected to the side of the circular sheet, arc-shaped rod or arc-shaped sheet facing the screw rod 311 , and one end of the plurality of connecting wires is connected to the screw rod 311 .

[0077] When the connecting piece 312 adopts a circular thin sheet and multiple connecting wires, one side of the circular thin sheet is used to connect to the inner wall surface of the catheter body 1, and the other side of the circular thin sheet is used to connect to multiple connecting wires. The connecting wire also adopts a filamentous structure with a size smaller than the radial size of the metal wire. One end of the connecting wire is connected to the center of the circular thin sheet, and the other end of the connecting wire is evenly arranged along the circumferential direction of the circular thin sheet with the center of the circular thin sheet as the axis, so that the connecting wires are radially distributed along the circular thin sheet. The circular thin sheet and the multiple connecting wires form an umbrella-like structure, the purpose of which is to further enhance the contact area and connection strength between the connecting piece 312 and the catheter body 1, so that it can quickly support the inner wall surface of the catheter body 1, realize the catheter body 1 to quickly enter the expanded state, and enhance the sealing connection between the catheter body 1 and the wound.

[0078] When the connecting member 312 adopts an arc rod and multiple connecting wires, the multiple connecting wires are radially connected to the side of the arc rod facing the screw rod 311, and the multiple connecting wires are connected to one end of the center of the arc rod and connected to the screw rod 311; the side of the arc rod not connected to the multiple connecting wires is connected to the inner wall of the catheter body 1. By arranging multiple connecting wires between the arc rod and the screw rod 311, the connecting wires further enhance the connection strength between the arc rod and the screw rod 311 and can increase the support area of ​​the arc rod, thereby increasing the support strength of the arc rod relative to the inner wall of the catheter body 1, so that when the screw rod 311 moves relative to the metal wire, it can further drive the tube wall of the catheter body 1 to rapidly contract and expand under the action of the multiple connecting wires and the arc rod, thereby realizing rapid adjustment of the aperture of the catheter body 1.

[0079] In addition, the outer diameter of the catheter body gradually increases from the head to the tube body; the small inner diameter of the head is convenient for reducing gaps to prevent bleeding and leakage; in addition, in order to be able to observe in time whether the head is extended into the dura mater, a locking ring is connected to the head, and an endoscope is connected to the locking ring. Since the inner diameter of the anesthesia catheter is usually less than 0.5mm, the endoscope uses an ultra-fine fiber endoscope with a diameter of less than 0.5mm to peek into whether the head of the catheter body has entered the dura mater.

[0080] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0081] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0082] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A continuous spinal anesthesia catheter, characterized in that: It includes a catheter body and a flexible support frame arranged in the catheter body: The catheter body includes a head and a body; a plurality of protrusions are connected between the head and the body along the circumference of the catheter body to limit the position of the head extending into the dura mater; The flexible support frame is used to support the wall of the catheter body to expand and contract in the radial direction, so that the catheter body can be transformed between an expanded state relative to the initial state and a contracted state relative to the initial state; The flexible support frame includes a central frame and multiple support frames; the central frame extends along the length direction of the catheter body; the multiple support frames are connected between the central frame and the catheter body along the circumference of the central frame, and can divide the catheter body cavity into multiple independent chambers, each independent chamber is provided with a corresponding drug outlet, so that the drug liquid output from the head part entering the dura mater is separated from the drug liquid output from the tube body.

2. A continuous spinal-epidural anesthesia catheter according to claim 1, characterized in that: The central frame is made of metal wire; One end of the metal wire extends to the head end of the head and is connected to the inner wall of the head, and the other end extends to the tail end of the tube body and is connected to the inner wall of the tube body; or, One end of the metal wire is in a pen-tip structure extending beyond the head end of the head by a preset distance, and a filler is filled between the outer peripheral surface of the metal wire extending beyond the head end and the outer wall surface of the head; the other end of the metal wire extends to the tail end of the tube body and is connected to the inner wall of the tube body.

3. A continuous spinal-epidural anesthesia catheter according to claim 1, characterized in that: The support frame includes a plurality of support components arranged along the circumferential direction of the central frame, and the support components separate the central frame into a plurality of independent chambers in the circumferential direction.

4. A continuous spinal-epidural anesthesia catheter as claimed in claim 3, characterized in that: The support assembly includes support wires and connecting films; a plurality of support wires are provided along the extension direction of the central frame, and a connecting film is connected between two adjacent support wires along the extension direction.

5. A continuous spinal-epidural anesthesia catheter as claimed in claim 4, characterized in that: The connecting film is stretchable so that two adjacent supporting wires can move relative to the central frame.

6. A continuous spinal-epidural anesthesia catheter according to claim 4, characterized in that: The support wire includes a screw rod and a connector connected to each other; the screw rod extends along the radial direction of the catheter body, the connector extends along the circumferential direction of the catheter body, one end of the screw rod is connected to the metal wire, and one side of the connector is connected to the inner wall of the catheter body.

7. A continuous spinal-epidural anesthesia catheter according to claim 6, characterized in that: The connecting member includes a circular thin sheet, the curvature of the circular thin sheet is adapted to the curvature of the catheter body to support the expansion or contraction of the catheter body; or, the connecting member includes an arc-shaped rod, the curvature of the arc-shaped rod is adapted to the curvature of the catheter body to support the expansion or contraction of the catheter body; or, the connecting member includes an arc-shaped sheet, the curvature of the arc-shaped sheet is adapted to the curvature of the catheter body to support the expansion or contraction of the catheter body.

8. A continuous spinal-epidural anesthesia catheter according to claim 7, characterized in that: The connecting member further comprises a plurality of connecting wires, which are radially connected to the side of the circular sheet, arc-shaped rod or arc-shaped sheet facing the screw rod, and one end of the plurality of connecting wires is connected to the screw rod.

9. The continuous spinal-epidural anesthesia catheter according to claim 1, characterized in that: The plurality of support components are distributed in a spiral manner along the extension direction of the central frame; or the plurality of support components are distributed in a straight line along the extension direction of the central frame.

10. The continuous spinal-epidural anesthesia catheter according to claim 1, characterized in that: The outer diameter of the catheter body gradually increases from the head to the tube body; a locking ring is also connected to the head, and an endoscope is connected to the locking ring. The endoscope uses an ultra-fine fiber endoscope with a diameter of less than 0.5mm to peek into whether the head of the catheter body enters the dura mater.

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