Telescopic anesthesia catheter

Abstract

The invention discloses a telescopic anesthesia catheter, and relates to the technical field of medical instruments, the telescopic anesthesia catheter comprises a catheter body, and the catheter body is provided with a catheter wall made of a flexible material; a medicine cavity channel for injecting medicine is formed in the tube wall; a head end for inserting an epidural needle tube is formed on one side of the medicine cavity channel, and a tail end for injecting medicine is formed on the other side of the medicine cavity channel; the metal wire is connected into the medicine cavity channel and extends from the head end to the tail end in the length direction of the medicine cavity channel; the elastic expansion component is connected between the inner wall of the tube wall and the metal wire and is configured to be capable of contracting towards the inner side and expanding towards the outer side in the radial direction of the medicine cavity channel, so that the tube wall can move between a folded contraction state in which the tube wall is driven by the elastic expansion component to the inner side and an expanded expansion state in which the tube wall is driven by the elastic expansion component to the outer side; the aperture of the tube wall can be adjusted relative to the wound to block the gap between the wound and the tube wall.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and specifically relates to a retractable anesthesia catheter. Background Art

[0002] An anesthesia catheter is a tube used to deliver anesthetic drugs into the patient's body. Made of soft, medical-grade materials, it offers excellent flexibility and chemical resistance, minimizing damage to human tissue. During an epidural injection, the cored epidural needle is first inserted into the epidural syringe and into the body, entering the epidural space. The needle is then removed from the syringe, and the anesthesia catheter is inserted into the syringe. Once the anesthesia catheter reaches the epidural space, the needle is removed from the anesthesia catheter, and the drug is injected into the epidural space through the anesthesia catheter.

[0003] During this process, conventional anesthesia catheters typically have a diameter of at least 1 mm. Reducing the diameter of the catheter can lead to a gap between the catheter and the wound, causing bleeding and leakage, and potentially leaking medication. Furthermore, smaller catheters can reduce drug delivery during insertion into the epidural space, and bending can block the catheter's delivery channel, preventing the medication from reaching the designated delivery location. However, to reduce pain, a smaller incision is desirable. This reduces damage to tissue, bleeding, and medication leakage, while also reducing pain during treatment, allowing for faster wound healing and a better medical experience. Furthermore, smaller catheters are easier to insert into the epidural space, reducing resistance during entry and ensuring a smoother anesthesia process. Therefore, achieving a smaller catheter size while increasing drug delivery and adequately sealing the gap between the incision and the outer wall of the catheter to prevent bleeding and medication leakage is a pressing technical issue. Summary of the Invention

[0004] The present application provides a retractable anesthesia catheter to solve the above-mentioned technical problems of achieving both a small-sized anesthesia catheter and an increased drug dosage, and fully sealing the gap between the wound and the outer wall of the anesthesia catheter to prevent bleeding and leakage of the drug solution.

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

[0006] A telescopic anesthesia catheter, comprising:

[0007] The catheter body has a tube wall formed of a flexible material; a drug cavity channel for injecting drugs is formed in the tube wall; one side of the drug cavity channel forms a head end for inserting an epidural needle tube, and the other side of the drug cavity channel forms a tail end for injecting drugs;

[0008] The metal wire is connected to the medicine cavity channel and extends from the head end to the tail end along the length direction of the medicine cavity channel;

[0009] The elastic expansion member is connected between the inner wall of the tube wall and the metal wire, and is configured to be able to shrink inward and expand outward along the radial direction of the medicine cavity channel, so that the tube wall can move between a folded and contracted state inward by the elastic expansion member and an expanded and expanded state outward by the elastic expansion member, thereby achieving adjustable diameter of the tube wall relative to the wound to seal the gap between the wound and the tube wall.

[0010] By adopting the above technical solution, an elastic expansion member is arranged inside the catheter body. The elastic expansion member can shrink inward to drive the tube wall of the catheter body to shrink, and the elastic expansion member can expand outward to drive the catheter body to expand outward. This not only makes the aperture size of the catheter body adjustable to adapt to different wounds, but also reduces the radial size of the anesthesia catheter to achieve smooth drug delivery even if it is less than 1 mm; the tube wall is retractable so that the gap between the catheter body and the wound is effectively blocked, preventing the formation of a gap between the wound and the catheter body, and then preventing bleeding and leakage of the drug solution; and the tube wall of the catheter body is expanded by the expansion movement of the elastic expansion member, further increasing the space of the drug cavity channel inside the catheter body and increasing the drug delivery amount of the drug solution channel.

[0011] A plurality of elastic expansion members are provided along the circumferential direction and the extending direction of the metal wire.

[0012] By adopting the above technical solution, multiple elastic expansion components are distributed in the circumferential direction of the metal wire, so that multiple elastic expansion components are arranged between the metal wire and the tube wall of the catheter body, thereby increasing the contact area with the tube wall. This not only enhances the support of the tube wall, effectively increases the support strength of the medicine cavity channel, and increases the amount of medicine, but also can be quickly expanded under the action of multiple elastic expansion components when the catheter body is in an expanded state.

[0013] The plurality of elastic expansion members are distributed on the outside of the metal wire in a spiral shape along the extension direction of the metal wire; or, the plurality of elastic expansion members are arranged on the outside of the metal wire in a straight line along the extension direction of the metal wire.

[0014] Through the above technical solution, the purpose of spirally distributing the elastic expansion member on the outside of the metal wire is to increase the contact area between the elastic expansion member and the catheter body, achieve uniform stress distribution, avoid sudden stress changes, and further improve the rapid expansion and rapid contraction capabilities of the catheter body; the linear distribution on the outside of the metal wire is conducive to processing and installation. In addition, multiple elastic expansion members can be staggered along the length direction on the outside of the metal wire to increase the distribution area of ​​the elastic expansion member relative to the catheter body, thereby increasing the support force of the elastic expansion member on the catheter body and achieving rapid expansion and rapid contraction.

[0015] At least three elastic expansion members are arranged along the circumferential direction of the metal wire; the three elastic expansion members are arranged at equal intervals or at unequal intervals.

[0016] Through the above technical solution, at least three elastic expansion members are arranged along the circumference of the metal wire to realize a trident structure. The triangular structure is relatively stable, further enhancing the support strength of the elastic expansion member on the catheter body.

[0017] The elastic expansion member includes at least one elastic support component; the elastic support component includes a first elastic support member and a second elastic support member; the first elastic support member is connected to the metal wire, the second elastic support member is connected to the inner wall of the tube wall, and the first elastic support member is connected to the second elastic support member.

[0018] Through the above technical solution, since at least three elastic expansion components are arranged along the circumference of the metal wire, and each elastic expansion component has at least one elastic support component, a trident structure is realized in the circumference of the metal wire, so that the connection between the catheter body and the metal wire is more stable. One of the elastic support components includes a first elastic support member and a second elastic support member. The first elastic support member is used to connect with the metal wire, and the second elastic support member is used to connect with the tube wall. The first elastic support member moves relative to the metal wire. When the first elastic support member expands or contracts, it can drive the second elastic support member to move, thereby driving the catheter body to move in a retractable manner, and realizing the retractable change of the aperture size of the catheter body. Therefore, the second elastic support member can further enhance the driving force or grasping force of the first elastic support member relative to the catheter body, so that the second elastic support member can further stretch the tube wall or fold and contract the tube wall.

[0019] The extension direction of the first elastic support member and the length direction of the metal wire have an initial preset angle; when the elastic expansion member gradually expands radially outward along the medicine cavity channel, the angle between the first elastic support member and the metal wire is greater than the preset angle and gradually increases until the tube wall is fully expanded to form a columnar tube wall with a circular cross-section, and the angle between the first elastic support member and the metal wire is 90 degrees.

[0020] By adopting the above technical solution, the first elastic support member is obliquely connected to the metal wire, and the end of the first elastic support member not connected to the metal wire faces the tail end, so that the first elastic support member is connected to the outside of the metal wire like a barb structure, which can not only reduce the resistance of the catheter body entering the human body, but also facilitate the first elastic support member and the catheter body to penetrate the human body together, and can effectively move relative to the metal wire under the action of elastic force, adapt to the changes in the wound, and adjust the tube wall of the catheter body to be telescopic, so as to achieve different apertures.

[0021] The catheter body, the elastic expansion member and the metal wire are in an integrated structure.

[0022] The above technical solution is helpful to enhance the connection strength between the catheter body, the elastic expansion member and the metal wire.

[0023] The radial dimension of the catheter body ranges from 0.3 mm to 0.6 mm.

[0024] Through the above technical solution, since the present application sets an elastic support component inside the catheter body, the tube wall has a retractable property, the aperture of the catheter body can be adjusted to adapt to the changes in the wound, and the catheter body can also be supported so that the drug cavity channel remains smooth and will not be blocked. Therefore, the radial dimension of the anesthesia catheter can be further reduced, breaking through the technical bottleneck of the traditional anesthesia catheter that cannot be less than 1mm, and realizing an anesthesia catheter of 0.3mm-0.6mm.

[0025] The head end adopts a self-sealing round head structure made of flexible material; the hardness of the head end is smaller than the hardness of the tail end.

[0026] Through the above technical solution, the head end can undergo elastic deformation according to the complex space in the human body, change direction by itself, and guide the catheter body to the resistance gap to smoothly reach the injured location.

[0027] The radial dimension of the catheter body gradually decreases from the tail end to the head end.

[0028] Through the above technical solution, the size of the head end is minimized, so that the resistance encountered by the front end of the catheter body during the process of inserting the head end into the human body into the epidural space can be reduced.

[0029] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0030] A retractable anesthesia catheter disclosed herein comprises a catheter body, a metal wire, and an elastic expansion member. The elastic expansion member is disposed within the catheter body. The elastic expansion member can contract inwardly to cause the wall of the catheter body to contract, and can expand outwardly to cause the catheter body to expand outward. This not only makes the pore size of the catheter body adjustable to accommodate different wounds, but also reduces the radial dimension of the anesthesia catheter to less than 1 mm while enabling smooth drug delivery. Furthermore, the retractable wall effectively seals the gap between the catheter body and the wound, preventing the formation of a gap between the wound and the catheter body, thereby preventing bleeding and leakage of drug solution. Furthermore, the expansion movement of the elastic expansion member causes the wall of the catheter body to expand, further increasing the space of the drug cavity channel within the catheter body and increasing the drug delivery volume of the drug delivery channel. This reduces the radial dimension of the anesthesia catheter while increasing the drug delivery volume. Furthermore, the sealing effect of the gap between the wound and the catheter body is improved, preventing bleeding and drug leakage, further reducing wound damage, alleviating patient pain, and improving user experience.

[0031] Since at least three elastic expansion components are arranged along the circumference of the metal wire, and each elastic expansion component has at least one elastic support component, a trident structure is realized in the circumference of the metal wire, so that the connection between the catheter body and the metal wire is more stable. One of the elastic support components includes a first elastic support component and a second elastic support component. The first elastic support component is used to connect with the metal wire, and the second elastic support component is used to connect with the tube wall. The first elastic support component moves relative to the metal wire. When the first elastic support component expands or contracts, it can drive the second elastic support component to move, thereby driving the catheter body to move in a retractable manner, and realizing the retractable change of the aperture size of the catheter body. Therefore, the second elastic support component can further enhance the driving force or gripping force of the first elastic support component relative to the catheter body, so that the second elastic support component can further stretch the tube wall or fold and contract the tube wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 This is a schematic structural diagram of a retractable anesthesia catheter according to one embodiment of the present application;

[0034] Figure 2 This is a schematic structural diagram of a retractable anesthesia catheter in an embodiment of the present application in a 40% expanded state;

[0035] Figure 3This is a schematic diagram of an elastic expansion member of a telescopic anesthesia catheter reaching a 40% expansion state according to one embodiment of the present application;

[0036] Figure 4 This is a schematic structural diagram of a retractable anesthesia catheter in an embodiment of the present application in a 60% expanded state;

[0037] Figure 5 This is a schematic diagram of an elastic expansion member of a telescopic anesthesia catheter reaching a 60% expansion state according to one embodiment of the present application;

[0038] Figure 6 This is a schematic structural diagram of a retractable anesthesia catheter in an expanded state with a maximum aperture according to an embodiment of the present application;

[0039] Figure 7 This is a schematic diagram of an elastic expansion member of a telescopic anesthesia catheter in an expanded state with a maximum aperture according to an embodiment of the present application;

[0040] Figure 8 This is a schematic structural diagram of an elastic expansion member of a telescopic anesthesia catheter according to one embodiment of the present application;

[0041] Figure 9 This is a schematic structural diagram of an elastic expansion member of a telescopic anesthesia catheter according to a second embodiment of the present application;

[0042] Figure 10 This is a schematic structural diagram of an elastic expansion member of a telescopic anesthesia catheter according to a third embodiment of the present application;

[0043] In the figure,

[0044] 1. Catheter body; 2. Metal wire; 3. Elastic expansion member; 31. Elastic support assembly; 311. First elastic support member; 312. Second elastic support member; 4. Head end; 5. Tail end; 6. Medicine cavity channel. 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 relates to a retractable anesthesia catheter, such as Figure 1-10 Shown, including:

[0051] The catheter body 1 has a tube wall formed of a flexible material; a drug cavity channel 6 for injecting drugs is formed in the tube wall; one side of the drug cavity channel 6 forms a head end 4 for inserting an epidural needle tube, and the other side of the drug cavity channel 6 forms a tail end 5 for injecting drugs;

[0052] The metal wire 2 is connected to the medicine cavity channel 6 and extends from the head end 4 to the tail end 5 along the length direction of the medicine cavity channel 6;

[0053] The elastic expansion member 3 is connected between the inner wall of the tube wall and the metal wire 2, and is configured to be able to shrink inward and expand outward along the radial direction of the medicine cavity channel 6, so that the tube wall can move between a folded and contracted state inward by the elastic expansion member 3 and an expanded and expanded state outward by the elastic expansion member 3, thereby achieving adjustable diameter of the tube wall relative to the wound to seal the gap between the wound and the tube wall.

[0054] An anesthesia catheter is a tube used to deliver anesthetic drugs into the patient's body. Made of soft, medical-grade materials, it offers excellent flexibility and chemical resistance, minimizing damage to human tissue. During an epidural injection, the cored epidural needle is first inserted into the epidural syringe and into the body, entering the epidural space. The needle is then removed from the syringe, and the anesthesia catheter is inserted into the syringe. Once the anesthesia catheter reaches the epidural space, the needle is removed from the anesthesia catheter, and the drug is injected into the epidural space through the anesthesia catheter. During this process, the diameter of traditional anesthesia catheters is usually around 1mm. If the anesthesia catheter is smaller than 1mm, problems may arise. First, there is a gap between the anesthesia catheter and the wound, which leads to bleeding leakage points and causes the drug to seep out of the gap. Second, when the anesthesia catheter is smaller in size, the drug delivery ability is reduced during the process of penetrating the epidural space of the human body and it is easy to bend and block the anesthesia catheter drug delivery channel, making it difficult for the drug to reach the designated drug delivery position. The smaller the aperture of the anesthesia catheter, the more benefits it will bring. For example, the smaller the radial size of the anesthesia catheter, the smaller the wound will be for the patient, reducing damage to human tissue, reducing bleeding and drug leakage, and reducing the patient's pain during treatment, allowing the body to recover faster and providing a better medical experience. Moreover, the smaller the size of the anesthesia catheter, the easier it is to introduce into the epidural space of the human body, reducing resistance during entry into the human body, and making the anesthesia process smoother. Therefore, how to achieve both a small size and prevent bleeding, and to fully seal the gap between the wound and the outer wall of the anesthesia catheter, is a problem to be solved by this application. Therefore, this application proposes a retractable anesthesia catheter, which makes the aperture of the anesthesia catheter retractable, so that the anesthesia catheter can adaptively adjust the aperture size according to the penetration path in the human body during insertion into the human body, expand to a degree that is compatible with the size of the wound, effectively sealing the gap between the wound and the outer wall of the anesthesia catheter, and preventing bleeding; and in the process of injecting drugs into the human body through the anesthesia catheter, it can also prevent the drug from leaking out of the gap, so that the drug can smoothly reach the designated drug delivery location. Moreover, the expansion movement of the elastic expansion member 3 causes the wall of the catheter body 1 to expand, further increasing the space of the drug cavity channel 6 inside the catheter body 1, increasing the drug delivery amount of the drug channel, achieving a reduction in the radial size of the anesthesia catheter while increasing the drug delivery amount, and also improving the sealing effect of the gap between the wound and the catheter body 1, preventing bleeding and drug leakage, further reducing wound damage, alleviating patient pain, and improving user experience.

[0055] Among them, the purpose of using flexible material for the catheter body 1 is to achieve foldable and retractable characteristics. The catheter body 1 has an inner wall surface and an outer wall surface. The inner wall surface encloses a medicine cavity channel 6 for drug injection. One side of the medicine cavity channel 6 forms a head end 4 for inserting the epidural needle tube, and the other side of the medicine cavity channel 6 forms a tail end 5 for injecting the drug; when the catheter body 1 is inserted into the epidural needle tube and reaches the specified position in the epidural space, the drug is injected into the medicine cavity channel 6 through the opening of the medicine cavity channel 6 at the tail end 5 on the outward side of the catheter body 1 or the drug injection port opened at other positions on the catheter body 1, and the drug flows out through the head end 4 of the medicine cavity channel 6 to reach the drug outlet position.

[0056] Among them, the metal wire 2 is connected to the medicine cavity channel 6 and extends from the head end 4 to the tail end 5 along the length direction of the medicine cavity channel 6; the metal wire 2 plays a supporting role for the catheter body 1. The metal wire 2 is arranged in the catheter body 1 and passes through the head end 4 to the tail end 5 of the catheter body 1, thereby improving the overall axial rigidity of the catheter body 1. The metal wire 2 also has a strong memory function. After the catheter body 1 has been in a curled state for a long time, it can also be restored to a straight state under the strength of the metal wire 2, ensuring that the catheter body 1 smoothly enters the designated position of the epidural space.

[0057] The elastic expansion member 3 is made of a flexible material, imparting a certain elastic force that allows it to passively contract or expand under the influence of the channel wall during movement through the wound channel. The elastic expansion member 3 is connected between the inner wall of the tube and the metal wire 2 and is configured to contract inwardly and expand outwardly along the radial direction of the medicine cavity channel 6. This allows the tube wall to move between a folded and contracted state (pulled inward by the elastic expansion member 3) and an expanded and expanded state (pulled outward by the elastic expansion member 3), thereby achieving adjustable diameter of the tube wall relative to the wound to seal the gap between the wound and the tube wall.

[0058] like Figure 1 、 2 As shown in , 4, 6, 8-10, the elastic expansion member 3 is connected between the tube wall and the metal wire 2, the proximal side of the elastic expansion member 3 is connected to the metal wire 2, and the distal side of the elastic expansion member 3 is inclined away from the metal wire 2 toward the tail end 5. The elastic expansion member 3 has elasticity so that it can expand outward or contract inward relative to the metal wire 2 along the radial direction of the catheter body 1. When the elastic expansion member 3 moves outward, the length of the projection of the elastic expansion member 3 on the cross section of the catheter body 1 gradually increases, thereby pushing open the tube wall of the catheter body 1 connected to the distal end of the elastic expansion member 3, so that the tube wall can continue to expand outward from the original folded and contracted state. When the elastic expansion member 3 is in a state perpendicular to the metal wire 2, the cross section of the catheter body 1 is circular, and the catheter body 1 at this time is a cylindrical structure. At this time, the radial dimension of the catheter body 1 reaches a maximum value, that is, the catheter body 1 is in an expanded state.

[0059] Since the catheter body 1 is inserted into the epidural needle tube and enters the epidural space of the human body, during the process of penetration into the human body, the outer wall of the catheter body 1 can always be in contact with the wound under the elastic action of the elastic expansion member 3. The elastic expansion member 3 can continuously contract or expand according to the size of the wound so that the outer wall of the catheter body 1 is in contact with the wound, and the gap between the wound and the outer wall of the catheter body 1 is blocked. This not only prevents blood from the damaged blood vessel from flowing out of the gap, but also prevents the drug injected into the drug cavity channel 6 from leaking from the gap. In addition, the aperture size of the catheter body 1 can be reduced because the anesthesia catheter adopts a retractable tube wall structure and the elastic expansion member 3 effectively supports the drug cavity channel 6 of the anesthesia catheter, so that the drug cavity channel 6 remains unobstructed and will not be blocked. The aperture size of the catheter body 1 can be reduced. Moreover, due to the provision of the elastic expansion member 3, the aperture size of the anesthesia catheter can be adjusted, and the aperture size of the anesthesia catheter can be further reduced to less than 1 mm.

[0060] As a preferred embodiment, a plurality of elastic expansion members 3 are provided along the circumferential direction and the extending direction of the metal wire 2 .

[0061] like Figure 1-3 As shown, a plurality of elastic expansion members 3 are distributed along the circumferential direction of the metal wire 2 in the cross section, and the plurality of elastic expansion members 3 can be distributed at equal intervals or at unequal intervals, and a plurality of elastic expansion members 3 are also provided along the extension direction of the metal wire 2, and the plurality of elastic expansion members 3 are distributed at equal intervals or at unequal intervals along the length direction of the metal wire 2; in addition, the plurality of elastic expansion members 3 distributed in the length direction of the metal wire 2 and the plurality of elastic expansion members 3 distributed in the circumferential direction of the metal wire 2 can be arranged relative to each other, or can be staggered.

[0062] For example, multiple elastic expansion members 3 are arranged linearly on the outside of the metal wire 2 along the extension direction of the metal wire 2. Three elastic expansion members 3 are distributed circumferentially on a certain cross section of the metal wire 2. Twelve elastic expansion members 3 are arranged along the extension direction of the metal wire 2, with four elastic expansion members forming a group. Each of the four elastic expansion members 3 corresponds to one of the three elastic expansion members 3 in the circumferential direction and is distributed linearly.

[0063] In addition, multiple elastic expansion members 3 can be distributed in a spiral shape on the outside of the metal wire 2 along the extension direction of the metal wire 2; the elastic expansion members 3 are distributed in a spiral shape on the outside of the metal wire 2, so that the elastic expansion members 3 are evenly distributed on multiple inner wall surfaces between the metal wire 2 and the tube wall, so that the contact area between the elastic expansion members 3 and the metal wire 2 is increased, and the sudden stress is reduced, thereby enhancing the connection strength between the metal wire 2 and the catheter body 1, so that the inner wall of the catheter body 1 can be fully abutted and connected with the wound under the action of multiple elastic expansion members 3, and the gap between the outer wall surface of the catheter body 1 and the wound is blocked from all directions of the catheter body 1 to prevent bleeding and leakage of liquid medicine.

[0064] Specifically, at least three elastic expansion members 3 are arranged along the circumference of the metal wire 2; the three elastic expansion members 3 are arranged at equal or unequal intervals. The elastic expansion members 3 include at least one elastic support assembly 31; the elastic support assembly 31 includes a first elastic support member 311 and a second elastic support member 312; the first elastic support member 311 is connected to the metal wire 2, the second elastic support member 312 is connected to the inner wall of the tube, and the first elastic support member 311 and the second elastic support member 312 are connected.

[0065] Based on the above embodiments, the distribution and structure of the elastic expansion member are described in detail below with reference to several specific examples:

[0066] Embodiment 1: The metal wire 2 has three elastic expansion members 3 in the circumferential direction, and four elastic expansion members 3 are arranged in a straight line along the axis or the extension direction or the axial direction of the metal wire 2;

[0067] Each elastic expansion member 3 includes an elastic support assembly 31, which includes a first elastic support member 311 and a second elastic support member 312. The first elastic support member 311 is arranged along the radial direction of the catheter body 1, and the second elastic support member 312 is arranged along the circumferential direction of the catheter body 1. The first elastic support member 311 is arranged obliquely with respect to the axial direction of the metal wire 2.

[0068] The first end of the first elastic support member 311 is connected to the metal wire 2, and the second end of the first elastic support member 311 is toward the tail end 5 of the catheter body 1, so that the second end of the first elastic support member 311 can move relative to the metal wire 2, and can move in the radial direction of the catheter body 1 close to the metal wire 2 to realize the contraction movement of the first elastic support member 311, or move away from the metal wire 2 to realize the expansion movement of the first elastic support member 311. The second end of the first elastic support member 311 is connected to the second elastic support member 312, and the other end of the second elastic support member 312 is connected to the inner wall surface of the catheter body 1.

[0069] Therefore, when the first elastic support member 311 moves toward the metal wire 2, it can cause the wall of the catheter body 1 to fold inward and contract under the action of the second elastic support member 312, thereby reducing the aperture of the catheter body 1. Similarly, when the first elastic support member 311 moves away from the metal wire 2, it can cause the wall of the catheter body 1 to expand outward and increase the aperture of the catheter body 1 under the action of the second elastic support member 312. When the first elastic support member 311 contacts a wound, it can move toward or away from the metal wire 2 according to the size of the wound, thereby achieving adjustable aperture size of the catheter body 1.

[0070] Embodiment 2: The metal wire 2 has three elastic expansion members 3 in the circumferential direction, and the metal wire 2 has three elastic expansion members 3 in the circumferential direction, wherein each elastic expansion member 3 includes three elastic support components 31;

[0071] The elastic support assembly 31 includes a first elastic support member 311 and a second elastic support member 312, the first elastic support member 311 is arranged along the radial direction of the catheter body 1, and the second elastic support member 312 is arranged along the circumferential direction of the catheter body 1, and the first elastic support member 311 is arranged obliquely with respect to the axial direction of the metal wire 2; the first end of the first elastic support member 311 is connected to the metal wire 2, the second elastic support member 312 is connected to the second end of the first elastic support member 311, and the other end of the second elastic support member 312 is connected to the inner wall surface of the catheter body 1; since each elastic expansion member 3 is provided with three elastic support assemblies 31, each elastic support assembly 31 has a first elastic support member 311, so each elastic expansion member 3 has a total of three first elastic support members 311, the first ends of the three first elastic support members 311 are connected and commonly connected to the metal wire 2, the second ends of the three first elastic support members 311 are respectively connected to their corresponding second elastic support members 312, and the three second elastic support members 312 are not connected to each other and are respectively connected to the inner wall surface of the catheter body 1.

[0072] Embodiment 3: The metal wire 2 has three elastic expansion members 3 in the circumferential direction, and the metal wire 2 has three elastic expansion members 3 in the circumferential direction, wherein each elastic expansion member 3 includes three elastic support components 31;

[0073] The elastic support assembly 31 includes a first elastic support member 311 and a second elastic support member 312. The first elastic support member 311 is arranged along the radial direction of the catheter body 1, and the second elastic support member 312 is arranged along the circumferential direction of the catheter body 1. The first elastic support member 311 is arranged at an angle relative to the axial direction of the metal wire 2. The first end of the first elastic support member 311 is connected to the metal wire 2, and the second elastic support member 312 is connected to the second end of the first elastic support member 311. The other end of the second elastic support member 312 is connected to the inner wall surface of the catheter body 1. Since each elastic expansion member 3 is provided with three elastic support assemblies 31, each elastic support assembly 31 has a first elastic support member 311. Therefore, each elastic expansion member 3 has a total of three first elastic support members 311. The first ends of these three first elastic support members 311 are connected and collectively connected to the metal wire 2. The second elastic support members 312 connected to the three first elastic support members 311 are interconnected to form an integrated structure.

[0074] The first elastic support member 311 has a filamentous structure, and the radial dimension of the first elastic support member 311 is smaller than the radial dimension of the metal wire 2. The second elastic support member 312 has an arc-shaped structure, and the curvature of the second elastic support member 312 is adapted to the curvature of the catheter body 1, so that when the catheter body 1 expands to the maximum circumferential size, the second elastic support member 312 can be fitted and connected to the inner side of the catheter body 1.

[0075] Specifically, the second elastic support member 312 has various implementations, which are not limited by the present application, and are described below:

[0076] Embodiment 1: The second elastic support member 312 includes a circular sheet and a plurality of arc-shaped brackets; the plurality of arc-shaped brackets are radially connected to one side of the circular sheet, and one end of the plurality of arc-shaped brackets is connected to the center of the circular sheet.

[0077] One side of the circular sheet is used to connect with the inner wall surface of the catheter body 1, and the other side of the circular sheet is used to connect with multiple arc-shaped brackets. The arc-shaped bracket also adopts a filamentous structure with a size smaller than the radial size of the metal wire 2. One end of the arc-shaped bracket is connected to the center of the circular sheet, and the other end of the arc-shaped bracket is evenly arranged along the circumferential direction of the circular sheet with the center of the circular sheet as the axis, so that the arc-shaped brackets are radially distributed along the circular sheet. The circular sheet and the multiple arc-shaped brackets form an umbrella-like structure, the purpose of which is to further enhance the contact area and connection strength between the second elastic support member 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] Embodiment 2: The second elastic support member 312 includes an arc-shaped rod, the curvature of which matches the curvature of the catheter body 1 , so that when the catheter body 1 expands to a cylindrical structure, the arc-shaped rod can fit the inner wall of the catheter body 1 .

[0079] Embodiment 3: The second elastic support member 312 includes an arc-shaped piece, the curvature of which is adapted to the curvature of the catheter body 1 , so that when the catheter body 1 expands to the maximum diameter state of the catheter body 1 , the arc-shaped piece can fit the inner wall of the catheter body 1 .

[0080] The second elastic support member 312 is in the form of an arc-shaped piece. The width dimension of the arc-shaped piece is increased compared to the arc-shaped rod in the second embodiment. The purpose is to increase the contact area between the second elastic support member 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 second elastic support member 312, so that the gap between the catheter body 1 and the wound is quickly blocked, reducing the probability of bleeding and leakage of drug solution.

[0081] As a preferred embodiment, the extension direction of the first elastic support member 311 and the length direction of the metal wire 2 have an initial preset angle; when the elastic expansion member 3 gradually expands radially outward along the medicine cavity channel 6, the angle between the first elastic support member 311 and the metal wire 2 is greater than the preset angle and gradually increases until the tube wall is fully expanded to form a columnar tube wall with a circular cross-section, and the angle between the first elastic support member 311 and the metal wire 2 is 90 degrees.

[0082] In the initial state, the first elastic support member 311 and the metal wire 2 are set at a preset angle, so that the first elastic support member 311 is tilted relative to the metal wire 2, and the second end of the first elastic support member 311 that is not connected to the metal wire 2 is facing the tail end 5 side of the catheter body 1. In this way, when the catheter body 1 is inserted into the epidural needle tube, the catheter body 1 can, during the process of contacting the wound, the first elastic support member 311 can realize outward expansion movement through the action of elastic force, and then the first elastic support member 311 drives the catheter body 1 to expand through the second elastic support member 312, or the first elastic support member 311 realizes inward contraction movement through the action of elastic force, and then the first elastic support member 311 drives the catheter body 1 to fold and contract through the second elastic support member 312, so that the aperture of the catheter body 1 is adjusted relative to the wound, effectively sealing the gap between the wound and the catheter body 1.

[0083] In this application, the catheter body 1, elastic expansion member 3, and metal wire 2 can be integrated into a single structure to facilitate assembly and improve connection strength, preventing breakage during insertion. Alternatively, a separate structure can be used, allowing for disassembly and easy replacement and cleaning. The specific structural form will depend on actual needs.

[0084] The size of a conventional anesthesia catheter is about 1 mm, while the radial size of the catheter body 1 of the anesthesia catheter of the present application ranges from 0.3 mm to 0.6 mm. This is because the present application sets an elastic expansion member 3 inside the catheter body 1. The elastic expansion member 3 can not only be located on the inner side of the tube wall to support the circumference of the tube wall, ensuring that the tube of the catheter body 1 is unobstructed, avoiding bending or blockage, and then achieving smooth flow of the liquid medicine, but also can make the tube wall pore size of the catheter body 1 of the present application adjustable due to the expansion and contraction of the elastic expansion member 3, thereby blocking the gap between the catheter body 1 and the wound. The gap between the wound and the outer wall of the catheter body 1 is formed, so that there is no gap between the wound and the outer wall of the catheter body 1, preventing blood and liquid medicine from flowing out of the gap. The retractable effect of the tube wall of the catheter body 1 makes the catheter body 1 have the ability of elastic deformation to adapt to the changes of the wound. Therefore, the anesthesia catheter of the present application can adopt a size less than 1mm, and the performance of the liquid medicine circulation will not be reduced due to the small size. On the contrary, it will ensure the smooth circulation of the liquid medicine, further prevent the leakage of liquid medicine and blood, and the reduced aperture of the anesthesia catheter can then use a smaller wound on the human body, reduce damage to the human body, alleviate the patient's pain, and improve user experience.

[0085] In addition, in order to smoothly insert the catheter body 1 into the epidural needle tube and penetrate into the human body to reach the epidural space, the present application adopts a self-sealing round head structure of flexible material for the head end 4 to reduce the resistance at the front end, and the head end 4 can undergo elastic deformation according to the complex space in the human body, change direction by itself, and guide the catheter body 1 to the resistance gap to smoothly reach the injured position; in addition, the hardness of the head end 4 is less than the hardness of the tail end 5, so the fracture resistance of the head end 4 is higher than that of the catheter body 1. When pulling out the anesthesia catheter, the head end 4 can withstand a large pulling force without breaking.

[0086] In order to reduce the resistance of the catheter body 1, the radial dimension of the catheter body 1 is gradually reduced from the tail end 5 to the head end 4, so that the size of the head end 4 is set to the smallest, so that the resistance encountered by the front end can be reduced during the process of the head end 4 of the catheter body 1 being inserted into the human body into the epidural space.

[0087] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0088] 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.

[0089] 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 retractable anesthesia catheter, characterized in that: include: The catheter body has a tube wall formed of a flexible material; a drug cavity channel for injecting drugs is formed in the tube wall; one side of the drug cavity channel forms a head end for inserting an epidural needle tube, and the other side of the drug cavity channel forms a tail end for injecting drugs; The metal wire is connected to the medicine cavity channel and extends from the head end to the tail end along the length direction of the medicine cavity channel; The elastic expansion member is connected between the inner wall of the tube wall and the metal wire, and is configured to be able to shrink inward and expand outward along the radial direction of the medicine cavity channel, so that the tube wall can move between a folded and contracted state inward by the elastic expansion member and an expanded and expanded state outward by the elastic expansion member, thereby achieving adjustable diameter of the tube wall relative to the wound to seal the gap between the wound and the tube wall.

2. A telescopic anesthesia catheter according to claim 1, characterized in that: A plurality of elastic expansion members are provided along the circumferential direction and the extending direction of the metal wire.

3. A telescopic anesthesia catheter according to claim 2, characterized in that: A plurality of elastic expansion members are distributed on the outside of the metal wire in a spiral shape along the extension direction of the metal wire; or, A plurality of elastic expansion members are arranged on the outer side of the metal wire in a straight line along the extending direction of the metal wire.

4. A telescopic anesthesia catheter according to claim 2, characterized in that: At least three elastic expansion members are arranged along the circumferential direction of the metal wire; the three elastic expansion members are arranged at equal intervals or at unequal intervals.

5. A telescopic anesthesia catheter according to claim 4, characterized in that: The elastic expansion member includes at least one elastic support component; The elastic support assembly includes a first elastic support member and a second elastic support member; the first elastic support member is connected to the metal wire, the second elastic support member is connected to the inner wall of the tube wall, and the first elastic support member is connected to the second elastic support member.

6. The telescopic anesthesia catheter according to claim 5, characterized in that: The extending direction of the first elastic support member and the length direction of the metal wire have an initial preset angle; When the elastic expansion member gradually expands radially outward along the medicine cavity channel, the angle between the first elastic support member and the metal wire is greater than the preset angle and gradually increases until the tube wall is fully expanded to form a columnar tube wall with a circular cross-section, and the angle between the first elastic support member and the metal wire is 90 degrees.

7. The telescopic anesthesia catheter according to claim 1, characterized in that: The catheter body, the elastic expansion member and the metal wire are in an integrated structure.

8. The telescopic anesthesia catheter according to claim 1, characterized in that: The radial dimension of the catheter body ranges from 0.3 mm to 0.6 mm.

9. The telescopic anesthesia catheter according to claim 1, wherein: The head end adopts a self-sealing round head structure made of flexible material; the hardness of the head end is smaller than the hardness of the tail end.

10. The telescopic anesthesia catheter according to claim 1, characterized in that: The radial dimension of the catheter body gradually decreases from the tail end to the head end.

Images