Continuous spinal anesthesia catheter
By designing a flexible support frame and multi-chamber structure for continuous spinal-epidural anesthesia catheters, the problem of traditional catheters being unable to enter the inner side of the dura mater was solved, achieving drug diversion and sealing, and improving drug delivery efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LINYI XINGHUA MEDICAL EQUIP
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional anesthetic catheters cannot reach the inner side of the dura mater to deliver drugs, leading to drug leakage and bleeding. They also cannot simultaneously achieve epidural anesthesia and spinal anesthesia, nor can they deliver different medications.
A continuous spinal-epidural anesthesia catheter is designed, which adopts a flexible support frame and multiple independent chamber structures. The radial dimension of the catheter body is adjusted by the expansion and contraction of the flexible support frame to achieve the separation of the inner cavity of the catheter and the diversion of drug solution. The connection strength is enhanced by metal wires and support components.
It achieves a sealed catheter body, preventing drug leakage and bleeding, while also enabling the delivery of different medications inside and outside the dura mater, improving drug delivery efficiency and reducing the number of wounds and patient suffering.
Smart Images
Figure CN120586243B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of medical device technology, specifically relating to a continuous spinal-epidural anesthesia catheter. Background Technology
[0002] An anesthetic catheter is a thin, flexible tube used to deliver medication to specific sites, such as the epidural space, during anesthesia or analgesia. Traditionally, for epidural 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 The epidural needle is then withdrawn from the body and exited along the catheter, leaving the anesthetic catheter in place.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 of the dura mater (subarachnoid space). 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 leakage of this fluid tissue. Therefore, traditional anesthesia catheters with a diameter of about 1 mm have difficulty entering the inner dura mater; they can only reach the outer side of the dura mater to deliver medication, and cannot deliver medication to the inner 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. Summary of the Invention
[0004] This application provides a continuous spinal-epidural anesthesia catheter to solve the aforementioned technical 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 application is as follows:
[0006] A continuous spinal-epidural anesthesia catheter includes a catheter body and a flexible support frame disposed within the catheter body:
[0007] The catheter body includes a head and a body; multiple protrusions connect the head and the body along the circumference of the catheter body to limit the head extending into the dura mater.
[0008] A flexible support frame is used to support the radial expansion and contraction of the catheter wall, so that the catheter can change between an expanded state and a contracted state relative to its initial state.
[0009] The flexible support frame includes a central frame and multiple support frames; the central frame extends along the length of the catheter body; the multiple support frames are connected circumferentially between the central frame and the catheter body, which can divide the inner cavity of the catheter body into multiple independent chambers, each independent chamber having a corresponding drug outlet, so that the drug solution output from the head entering the dura mater is separated from the drug solution 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 and is connected to the inner wall of the head, and the other end extends to the tail end of the tube and is connected to the inner wall of the tube; or, one end of the metal wire extends beyond the head end of the head at a predetermined distance in a pen-tip structure, and the outer peripheral surface of the portion of the metal wire extending beyond the head end is filled with filler between it and the outer wall surface of the head; the other end of the metal wire extends to the tail end of the tube and is connected to the inner wall of the tube.
[0011] The support frame includes multiple support components arranged along the circumference of the central frame, which divide the central frame into multiple independent chambers in the circumference direction.
[0012] The support assembly includes support wires and connecting films; multiple support wires are arranged along the extension direction of the central frame, and a connecting film connects two adjacent support wires along the extension direction.
[0013] The connecting film is stretchable, allowing two adjacent support wires to move relative to the central frame.
[0014] The support wire includes a screw and a connector connected together; the screw extends radially along the conduit body, the connector extends circumferentially along the conduit body, one end of the screw is connected to a metal wire, and one side of the connector is connected to the inner wall of the conduit body.
[0015] The connector includes a circular thin plate, the curvature of which matches the curvature of the catheter body to support the catheter body in opening or closing; or, the connector includes an arc-shaped rod, the curvature of which matches the curvature of the catheter body to support the catheter body in opening or closing; or, the connector includes an arc-shaped piece, the curvature of which matches the curvature of the catheter body to support the catheter body in opening or closing.
[0016] The connector also includes multiple connecting wires, which are radially connected to the side of the circular sheet, arc rod, or arc plate facing the lead rod, and one end of each connecting wire is connected to the lead rod.
[0017] Multiple support components are spirally distributed along the extension direction of the central frame; or, multiple support components are linearly distributed along the extension direction of the central frame.
[0018] The outer diameter of the catheter gradually increases from the head to the body. A locking ring is also 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 has entered 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 this application includes a catheter body and a flexible support frame disposed within the catheter body; the flexible support frame is used to support the radial expansion and contraction of the catheter body wall, so that the catheter body can change between an expanded state and a contracted state relative to the initial state, thereby adjusting the radial dimension of the catheter body wall according to the wound to achieve wound sealing, prevent gaps between the wound and the catheter body, and thus promptly stop bleeding when blood vessels are damaged. Furthermore, when delivering drugs through the catheter body, leakage of the drug solution through gaps between the wound and the catheter body is prevented. The flexible support frame also supports the catheter body internally, increasing the internal space of the catheter body, further increasing the drug delivery capacity, 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 of the catheter body, and the multiple support frames are connected circumferentially between the central frame and the catheter body. This divides the inner cavity of the catheter into multiple independent chambers, each with a corresponding drug outlet. This allows for the separation of the medication output from the head entering the dura mater from the medication output from the body. 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 the 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 wounds, reduces patient suffering, and saves time.
[0022] 2. As one embodiment of this application, the central frame is made of metal wire; one end of the metal wire extends to the head end and is connected to the inner wall of the head, and the other end extends to the tail end of the tube and is connected to the inner wall of the tube; or, one end of the metal wire extends beyond the head end of the head at a predetermined distance in a pen-tip structure, and the outer peripheral surface of the portion of the metal wire extending beyond the head end is filled with filler between it and the outer wall surface of the head; the other end of the metal wire extends to the tail end of the tube and is connected to the inner wall of the tube.
[0023] The central frame is made of metal wire, which also has a strong memory function. After the catheter has been curled up for a long time, it can return to a straight state under the strength of the metal wire, ensuring that the catheter can be smoothly inserted into the designated position in the epidural lumen.
[0024] There are two ways to lay the metal wire. The first way is to extend the metal wire from the head to the body of the catheter, from one side of the head to the other side of the body, to support the axial direction of the catheter body. The second way is to set the head of the metal wire to protrude outward from the catheter body and to have a pen-tip-like tip. The purpose of this setting is to puncture the dura mater through the smallest possible incision. Inserting the wire into the small incision allows the incision to gradually open. This setting allows the dura mater wound to shrink and recover more quickly after the catheter is withdrawn from the dura mater, preventing a large amount of cerebrospinal fluid inside the dura mater from flowing out through the incision.
[0025] 3. As a preferred embodiment of this application, the support frame includes a plurality of support components arranged along the circumferential direction of the central frame, thereby dividing the central frame into a plurality of independent chambers in the circumferential direction through the support components.
[0026] The support components divide the internal space of the catheter into multiple independent chambers along the circumference of the central frame. These support components are either spirally distributed along the extension direction of the central frame or linearly distributed along the same direction. The spiral distribution of these support components on the outer side of the wire ensures that the support components are evenly distributed on multiple inner wall surfaces between the wire and the catheter wall. This increases the contact area between the support components and the wire, reduces abrupt stress, and enhances the connection strength between the wire and the catheter. This allows the inner wall of the catheter to fully contact and connect with the wound under the action of the multiple support components, sealing the gaps between the outer wall of the catheter and the wound from all directions, preventing bleeding and leakage of medication.
[0027] 4. In a preferred embodiment of this application, the support assembly includes support wires and connecting films; multiple 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.
[0028] When the support wire moves away from the metal wire, the support assembly expands as a whole, causing the catheter wall to expand. At this time, the radial dimension of the catheter increases. A connecting membrane is connected between two adjacent support wires along the extension direction of the central frame. 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 wire, so that the support wire can move relative to the central frame, i.e., the metal wire, thereby realizing the adjustment of the catheter orifice diameter.
[0029] 5. In a preferred embodiment of this application, the support wire includes a threaded rod and a connector connected together; the threaded rod extends radially along the conduit body, the connector extends circumferentially along the conduit body, one end of the threaded rod is connected to a metal wire, and one side of the connector is connected to the inner wall of the conduit body.
[0030] When the lead screw moves in a contracting motion relative to the metal wire, it causes the catheter wall to fold inward and contract under the action of the connector, reducing the catheter orifice diameter. Similarly, when the lead screw moves in an expanding motion relative to the metal wire, it causes the catheter wall to expand outward, increasing the catheter orifice diameter. When the lead screw contacts the wound, it can contract or expand relative to the metal wire according to the size of the wound, thereby achieving adjustable catheter orifice diameter. Attached Figure Description
[0031] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0032] Figure 1 This is a schematic diagram of a continuous spinal-epidural anesthesia catheter according to one embodiment of this application;
[0033] Figure 2 This is a schematic diagram of a continuous spinal-epidural anesthesia catheter according to another embodiment of this application;
[0034] Figure 3 This is a schematic diagram of a continuous spinal-epidural anesthesia catheter reaching a 40% dilation state according to one embodiment of this application;
[0035] Figure 4 This is a schematic diagram of the flexible support frame of a continuous spinal-epidural anesthesia catheter reaching a 40% expansion state according to one embodiment of this application.
[0036] Figure 5 This is a schematic diagram of a continuous spinal-epidural anesthesia catheter reaching 60% dilation, according to one embodiment of this application.
[0037] Figure 6 This is a schematic diagram of the flexible support frame of a continuous spinal-epidural anesthesia catheter reaching a 60% expansion state according to one embodiment of this application.
[0038] Figure 7 This is a schematic diagram of the structure of a continuous 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 flexible support frame of a continuous spinal-epidural anesthesia catheter in its expanded state at maximum orifice, according to one embodiment of this application.
[0040] Figure 9 This is a schematic diagram of the structure of a flexible support frame for a continuous spinal-epidural anesthesia catheter according to one embodiment of this application;
[0041] Figure 10 This is a schematic diagram of the second drug outlet position of a continuous spinal-epidural anesthesia catheter according to one embodiment of this application;
[0042] Figure 11 This is a schematic diagram of the first drug outlet position of a continuous spinal-epidural anesthesia catheter according to one embodiment of this application;
[0043] In the picture,
[0044] 1. Catheter body; 2. Central frame; 3. Support frame; 31. Support assembly; 311. Lead screw; 312. Connector; 4. Head end; 5. Tail end; 6. Drug chamber channel; 7. First chamber; 8. Second chamber; 9. Third chamber; 10. First drug outlet; 11. Second drug outlet; 12. Protrusion; 13. Filler. Detailed Implementation
[0045] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.
[0046] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.
[0047] Furthermore, it should be understood in the description of this application 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, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.
[0048] In this application, unless otherwise expressly 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 invention according to the specific circumstances.
[0049] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the 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 application. 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 can be combined in any suitable manner in one or more embodiments or examples.
[0050] This application also relates to a continuous spinal-epidural anesthesia catheter, such as Figure 1-11 As shown, it includes a catheter body 1 and a flexible support frame 3 disposed within the catheter body 1:
[0051] The catheter body 1 includes a head and a body; the length of the head is smaller than the length of the body, and the radial dimension of the catheter body 1 gradually decreases from the body side to the head side, so that the incision for the head to enter the inner side of the dura mater is smaller, and leakage of fluid tissue from the head and the dura mater is avoided; a plurality of protrusions 12 are connected between the head and the body along the circumference of the catheter body 1 to limit the head that enters the dura mater.
[0052] The flexible support frame 3 is used to support the tube wall of the conduit body 1 to expand and contract radially, so that the conduit body 1 can change between an expanded 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 of the catheter body 1; the multiple support frames 3 are mainly connected inside the tube body 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, each independent chamber having a corresponding drug outlet, so that the drug solution output from the head entering the dura mater is separated from the drug solution output from the tube body.
[0054] The catheter body 1 of this application serves as the main structure of the anesthesia catheter. The inner lumen of the catheter body 1 forms a drug delivery channel 6. The catheter body 1 extends 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 body 1 is then inserted into the tube and enters the epidural space, reaching the dura mater. The head of the catheter body 1 can further puncture the dura mater, successfully entering its interior. Traditional anesthesia catheters can only reach the epidural space and are located on the outer side of the dura mater. Because the diameter of anesthesia catheters is approximately 1 mm, their relatively large size makes entry into the dura mater difficult, as the dura mater contains fluid tissue. Larger anesthesia catheters are prone to causing leakage of fluid tissue from 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 for drug delivery, thus failing to achieve drug delivery to the inner side of the dura mater. However, the head of the catheter body 1 of this application can enter the inner side of the dura mater, while the body 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 protrusion 12 causes the body to be stuck on the outer side of the dura mater. When the staff feels the jamming during the insertion of the catheter body 1 and observes the internal situation through the 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 inside the catheter body 1. The flexible support frame 3 supports the catheter body 1. Because the catheter body 1 is made of flexible material, it has extensibility. Therefore, the internal flexible support frame 3 can provide radial and axial support for the catheter body 1. When the flexible support frame 3 expands outward, it can cause the catheter body 1 to expand radially. When the flexible support frame 3 contracts inward, it can cause the catheter body 1 to fold and contract radially. This allows the radial dimension of the catheter body 1 to be adjusted according to the wound, thereby sealing the wound and preventing gaps between the wound and the catheter body 1. This allows for timely closure of bleeding when blood vessels are damaged. Furthermore, when delivering medication through the catheter body 1, leakage of medication through gaps between the wound and the catheter body 1 is prevented. The flexible support frame 3 can support the catheter body 1 inside the catheter body 1, increasing the internal space of the catheter body 1, further increasing the amount of medication delivered by the catheter body 1, and improving the medication delivery efficiency. Moreover, most importantly, because the flexible support frame 3 can form multiple independent chambers inside the catheter body 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 the medications to be transported to different sites, enabling the delivery of different medications with a single anesthesia catheter. This avoids the need to use multiple anesthesia catheters to deliver different medications, reduces the number of incisions, reduces patient suffering, and saves time for surgery.
[0056] In one preferred embodiment, the central frame 2 is made of metal wire. Furthermore, two implementation methods are used for the arrangement of the metal wire, as detailed below:
[0057] Implementation method one: such as 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 support 2 of this application uses metal wire, which extends from the head to the body, from the head end 4 to the tail end 5, providing axial support for the catheter body 1. The metal wire also has strong memory function; after the catheter body 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 body 1 can smoothly enter the designated location in the epidural lumen.
[0059] Implementation Method Two: (e.g.) Figure 2As shown, one end of the metal wire extends beyond the head end 4 of the head by a predetermined distance in a pen-tip structure, and the outer peripheral surface of the metal wire extending beyond the head end 4 is filled with filler 13 between it 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 tip can be designed to protrude outward from the catheter body and have a pen-tip-like tip. The purpose of this design is to puncture the dura mater through the smallest possible incision. Insertion into the small incision allows the incision to gradually open. This design allows the dura mater wound to shrink and recover more quickly after the catheter is withdrawn from the dura mater, preventing a large outflow of cerebrospinal fluid from the dura mater through the incision.
[0061] In a preferred embodiment, the support frame 3 includes a plurality of support components 31 arranged along the circumferential direction of the central frame 2, thereby dividing the central frame 2 into a plurality of independent chambers in the circumferential direction through the support components 31.
[0062] like Figure 3 , 5 As can be seen from points 7, 9, 10, and 11, preferably, the support frame 3 is disposed within the tube body. The purpose of this arrangement is to 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 spirally distributed along the extension direction of the central frame 2; or, the multiple support components 31 are linearly distributed along the extension direction of the central frame 2. The spiral distribution of the multiple support components 31 on the outer side of the metal wire ensures that the support components 31 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 31 and the metal wire, reduces abrupt stress, and thus enhances the connection strength between the metal wire and the catheter body 1. This allows the inner wall of the catheter body 1 to fully contact and connect with the wound under the action of the multiple support components 31, sealing the gap between the outer wall surface of the catheter body 1 and the wound from all directions, preventing bleeding and leakage of medication.
[0063] In this application, three support components 31 are preferably used. These three support components 31 are arranged linearly along the axis of the catheter body 1, dividing the interior of the catheter body 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 catheter body and the head, as shown below. Figure 10 and Figure 11As 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.
[0064] Furthermore, the support assembly 31 includes support wires and connecting films; multiple 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, a support wire is positioned 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, while the distal end is inclined relative to the metal wire and faces the catheter body. This allows the support wire to move relative to the metal wire under external influence when the catheter body 1 is inserted into the body. When the support wire moves closer to the metal wire, the support assembly 31 contracts, causing the catheter body 1 wall to fold and contract, thus reducing the radial dimension of the catheter body 1. When the support wire moves away from the metal wire, the support assembly 31 expands, causing the catheter body 1 wall to expand, thus increasing the radial dimension of the catheter body 1. A connecting membrane connects two adjacent support wires along the extension direction of the central frame 2. The connecting membrane is stretchable and can not only divide the interior of the catheter body 1 into multiple independent chambers along the axial direction, but also further cooperate with the deformation of the support wire, allowing the support wire to move relative to the central frame 2, i.e., the metal wire, thereby achieving adjustable catheter body 1 orifice diameter.
[0066] In a preferred embodiment, the support wire includes a lead screw 311 and a connector 312 connected together; the lead screw 311 extends in the radial direction of the conduit body 1, and the connector 312 extends in the circumferential direction of the conduit body 1; one end of the lead screw 311 is connected to a metal wire, and one side of the connector 312 is connected to the inner wall of the conduit body 1.
[0067] The lead screw 311 is arranged along the radial direction of the conduit body 1, and the connector 312 is arranged along the circumferential direction of the conduit body 1. The lead screw 311 is inclined relative to the axis of the metal wire. The first end of the lead screw 311 is connected to the metal wire, and the second end of the lead screw 311 faces the tail end 5 of the conduit body 1. In this way, the second end of the lead screw 311 can move relative to the metal wire. It can move closer to the metal wire along the radial direction of the conduit body 1 to realize the contraction movement of the lead screw 311, or move away from the metal wire to realize the expansion movement of the lead screw 311. The second end of the lead screw 311 is connected to the connector 312, and the other end of the connector 312 is connected to the inner wall surface of the conduit body 1.
[0068] Therefore, when the lead screw 311 moves in a contracting motion relative to the metal wire, it can cause the wall of the catheter body 1 to fold inward and contract under the action of the connector 312, thus reducing the orifice diameter of the catheter body 1. Similarly, when the lead screw 311 moves in an expanding motion relative to the metal wire, it can cause the wall of the catheter body 1 to expand outward, thus increasing the orifice diameter of the catheter body 1. When the lead screw 311 contacts the wound, it can contract or expand relative to the metal wire according to the size of the wound, thereby making the orifice diameter of the catheter body 1 adjustable.
[0069] The structural form of connector 312 is not limited to that of this application, and the following implementation methods can be adopted:
[0070] Implementation method 1: The connector 312 includes a circular sheet, the curvature of which is adapted to the curvature of the catheter body 1 to support the catheter body 1 to open or close.
[0071] One side of the circular thin plate is used to connect with the inner wall of the catheter body 1, and the other side of the circular thin plate is used to connect with the screw 311. The circular thin plate can increase the contact area with the inner wall of the catheter body 1, thereby further increasing the support force of the screw 311 on the inner wall of the catheter body 1. When the screw 311 moves closer to or away from the metal wire, it can quickly grasp the wall of the catheter body 1 through the circular thin plate, realizing the rapid contraction or expansion of the catheter body 1. It can quickly adjust the contraction or expansion of the catheter body 1 according to the size of the wound, improve the speed of sealing the gap, and reduce bleeding and leakage of medicine.
[0072] Implementation method 2: The connector 312 includes an arc-shaped rod, the curvature of which is adapted to the curvature of the conduit body 1 to support the conduit body 1 to open or close.
[0073] 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 catheter body 1 is that when the catheter body 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 catheter body 1, increasing the contact area between the arc-shaped rod and the catheter body 1, and meeting the need for rapid expansion of the catheter body 1.
[0074] Implementation method 3: The connector 312 includes an arc-shaped piece, the curvature of which is adapted to the curvature of the catheter body 1 to support the catheter body 1 to open or contract.
[0075] The connector 312 adopts an arc-shaped plate structure. The arc-shaped plate has an increased width dimension compared to the arc-shaped rod in Embodiment 2. The purpose is to increase the contact area between the connector 312 and the inner wall of the catheter body 1. When the catheter body 1 is expanded, more of the inner wall of the catheter body 1 can be opened at the same time under the support of the connector 312, so that the gap between the catheter body 1 and the wound can be quickly sealed, reducing the probability of bleeding and leakage of medicine.
[0076] Implementation method 4: The connector 312 also includes a plurality of connecting wires, which are radially connected to the side of the circular sheet, the arc rod or the arc plate facing the lead rod 311, and one end of the plurality of connecting wires is connected to the lead rod 311.
[0077] When the connector 312 uses a circular sheet and multiple connecting wires, 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 multiple connecting wires. The connecting wires also adopt a filamentous structure with a size smaller than the radial dimension of a metal wire. One end of the connecting wire is connected to the center of the circular sheet, and the other end of the connecting wire is evenly arranged along the circumference of the circular sheet with the center of the circular sheet as the axis, so that the connecting wires are radially distributed along the circular sheet. The circular sheet and multiple connecting wires form an umbrella-like structure, which aims to further enhance the contact area and connection strength between the connector 312 and the catheter body 1, thereby enabling rapid support of the inner wall of the catheter body 1, allowing the catheter body 1 to quickly enter the expansion state, and enhancing the sealing connection between the catheter body 1 and the wound.
[0078] When the connector 312 uses an arc-shaped rod and multiple connecting wires, the multiple connecting wires are radially connected to the side of the arc-shaped rod facing the threaded rod 311, and the multiple connecting wires are connected to the threaded rod 311 at one end of the center of the arc-shaped rod. The side of the arc-shaped rod without the multiple connecting wires is connected to the inner wall of the conduit body 1. By setting multiple connecting wires between the arc-shaped rod and the threaded rod 311, the connecting wires further enhance the connection strength between the arc-shaped rod and the threaded rod 311 and increase the support area of the arc-shaped rod, thereby increasing the support force of the arc-shaped rod relative to the inner wall of the conduit body 1. Thus, when the threaded rod 311 moves relative to the metal wire, it can further drive the wall of the conduit body 1 to rapidly contract and expand under the action of the multiple connecting wires and the arc-shaped rod, thereby realizing the rapid adjustment of the orifice diameter of the conduit body 1.
[0079] In addition, the outer diameter of the catheter gradually increases from the head to the body; the small inner diameter of the head helps to reduce gaps and prevent bleeding and leakage; furthermore, 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. Since the inner diameter of the anesthesia catheter is usually less than 0.5 mm, an ultra-fine fiber endoscope with a diameter of less than 0.5 mm is used to examine whether the head of the catheter body has entered the dura mater.
[0080] For any parts not mentioned in this application, existing technologies may be used or referenced.
[0081] 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.
[0082] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A continuous spinal-epidural anesthesia catheter, characterized in that, Includes the catheter body and a flexible support frame housed within the catheter body: The catheter body includes a head and a body; multiple protrusions connect the head and the body along the circumference of the catheter body to limit the head extending into the dura mater. A flexible support frame is used to support the radial expansion and contraction of the catheter wall, so that the catheter can change between an expanded state and a contracted state relative to its initial state. The flexible support frame includes a central frame and multiple support frames. The central frame is made of metal wire and extends along the length of the catheter body. Multiple support frames are circumferentially connected between the central frame and the catheter body, which can divide the inner cavity of the catheter body into multiple independent chambers. Each independent chamber has a corresponding drug outlet. The head has a first drug outlet, through which the drug solution is output to the inner side of the dura mater. The body has a second drug outlet, through which the drug solution is output to the outer side of the dura mater, thus separating the drug solution output from the head that enters the dura mater from the drug solution output from the body. The support frame includes multiple support components arranged along the circumference of the central frame, which divide the central frame into multiple independent chambers in the circumference direction. Each support component includes support wires and connecting films. Multiple support wires are arranged along the extension direction of the central frame, and a connecting film connects two adjacent support wires along the extension direction. The connecting film is extensible, allowing two adjacent support wires to move relative to the central frame.
2. The continuous spinal-epidural anesthesia catheter as described in claim 1, characterized in that, One end of the metal wire extends to the head end and is connected to the inner wall of the head, and the other end extends to the tail end of the tube and is connected to the inner wall of the tube. or, One end of the metal wire extends beyond the head end of the head by a predetermined distance in a pen-tip structure, and the outer peripheral surface of the metal wire extending beyond the head end is filled with filler material between it and the outer wall surface of the head; the other end of the metal wire extends to the tail end of the tube and is connected to the inner wall of the tube.
3. The continuous spinal-epidural anesthesia catheter as described in claim 2, characterized in that, The support wire includes a screw and a connector connected together; the screw extends radially along the conduit body, the connector extends circumferentially along the conduit body, one end of the screw is connected to a metal wire, and one side of the connector is connected to the inner wall of the conduit body.
4. The continuous spinal-epidural anesthesia catheter as described in claim 3, characterized in that, The connector includes a circular thin plate, the curvature of which matches the curvature of the catheter body to support the catheter body in opening or closing; or, the connector includes an arc-shaped rod, the curvature of which matches the curvature of the catheter body to support the catheter body in opening or closing; or, the connector includes an arc-shaped piece, the curvature of which matches the curvature of the catheter body to support the catheter body in opening or closing.
5. The continuous spinal-epidural anesthesia catheter as described in claim 4, characterized in that, The connector also includes multiple connecting wires, which are radially connected to the side of the circular sheet, arc rod, or arc plate facing the lead rod, and one end of each connecting wire is connected to the lead rod.
6. The continuous spinal-epidural anesthesia catheter as described in claim 1, characterized in that, Multiple support components are spirally distributed along the extension direction of the central frame; or, multiple support components are linearly distributed along the extension direction of the central frame.
7. The continuous spinal-epidural anesthesia catheter as described in claim 1, characterized in that, The outer diameter of the catheter gradually increases from the head to the body; a locking ring is also 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 body has entered the dura mater.