Guide wire

Abstract

A guide wire comprises a conveying section and a limiting section which are connected. The limiting section is of a multi-circle spiral structure, the axis of the multi-circle spiral structure and the axis of the conveying section are parallel or coincide, and the limiting section is used for penetrating through the foramen ovale to be placed in the left atrium. When the guide wire is used, the limiting section penetrates through the foramen ovale, the limiting section is arranged in the left atrium on one side of the foramen ovale, the conveying section is arranged in the right atrium on the other side of the foramen ovale, when other instruments are conveyed through the conveying section in the later period, the limiting section of the multi-circle spiral structure can abut against human tissue around the foramen ovale, and then the guide wire is prevented from slipping off from the foramen ovale. And subsequent other treatment operations can be guaranteed. The designed guide wire is a guide wire with an anti-slip function, and when the guide wire is adopted for an operation, the problem that in the operation process, due to the fact that the guide wire slips from a diseased region, instrument conveying fails can be effectively solved, the operation time is shortened, and the operation risk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a guide wire. Background Art

[0002] When treating structural heart diseases such as patent foramen ovale, atrial septal defect, ventricular septal defect, etc., a guidewire is needed to establish an intravascular device delivery track.

[0003] The current guidewire is a linear shape. In the treatment of diseases such as patent foramen ovale, atrial septal defect, and ventricular septal defect, the guidewire is passed through the defect site. When exchanging instruments or performing other operations, the guidewire can easily slip out of the defect site, requiring another operation to pass the guidewire through the defect site, which increases the operation time and surgical risks. Utility Model Content

[0004] The present application provides a guide wire, the main purpose of which is to design a guide wire that can prevent it from slipping out of a defect site.

[0005] A guidewire is provided in an embodiment of the present application, comprising: a delivery segment and a limiting segment connected to each other; the limiting segment is a multi-turn spiral structure, the axis of the multi-turn spiral structure is parallel to or coincides with the axis of the delivery segment, and the limiting segment is used to pass through the foramen ovale and be placed in the left atrium.

[0006] In which, the limiting section is a cylindrical multi-turn spiral structure, or the limiting section is a conical multi-turn spiral structure; when the limiting section is a conical multi-turn spiral structure, the limiting section has a connecting end and a free end, and the radial dimension of the multi-turn spiral structure continuously decreases from the side of the free end to the side of the connecting end, and the end of the conveying section is connected to the connecting end.

[0007] In which, the conveying section includes an outer tube and an inner core, and the inner core is sleeved and fixed in the outer tube; the outer tube includes a first tube body and a second tube body connected to each other, the first tube body is located on the side away from the limiting section, and the second tube body is located on the side close to the limiting section; the second tube body is an elastic tube body, when liquid is filled into the interior of the conveying section, the second tube body expands into a spherical or sac shape, and the second tube body is used to abut against the oval foramen.

[0008] In which, the conveying section also includes a third tube body, one end of the third tube body is connected to the second tube body, and the other end is connected to the limiting section; the inner core is a solid metal part, or the inner core is a tube structure formed by braiding or spirally winding metal wire.

[0009] The second tube body and the first tube body, as well as the second tube body and the third tube body are connected by thermal welding.

[0010] Wherein, the conveying section further includes a supporting core, the inner core is a tubular structure, and the supporting core is sleeved and fixed inside the inner core.

[0011] In which, a section of the support core close to the limiting section is a guide section, and the guide section is located on the outside of the second tube body, and the radial size of the guide section continuously decreases from the side away from the limiting section to the side close to the limiting section; and / or, the second tube body is a conical tube, and the radial size of the conical tube continuously decreases from the side away from the limiting section to the side close to the limiting section.

[0012] Wherein, the end of the limiting section is connected to the end of the guiding section away from the first tube body.

[0013] Wherein, the first tube body is made of polymer material, and the inner core is made of metal material.

[0014] Wherein, it also includes a transfer tube, one end of which is sleeved with an end of the conveying section away from the limiting section, and the other end of the transfer tube is used to be connected to the syringe.

[0015] According to the guidewire in the above embodiment, the guidewire includes a delivery section and a limiting section connected to each other. When the guidewire is used, the limiting section passes through the foramen ovale and is placed in the left atrium on one side of the foramen ovale, while the delivery section is placed in the right atrium on the other side of the foramen ovale. When other instruments (such as sheaths) are delivered through the delivery section at a later stage, the limiting section with a multi-turn spiral structure can abut against the human tissue around the foramen ovale, thereby preventing the guidewire from slipping from the foramen ovale, so as to facilitate other subsequent treatment operations. That is, the designed guidewire is a guidewire with an anti-slip function. When the guidewire is used for surgery, it can effectively prevent the guidewire from slipping from the lesion site, resulting in the failure of instrument delivery, thereby shortening the operation time and reducing the surgical risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the planar structure of the guide wire in the embodiment of the present application;

[0017] Figure 2 Schematic diagram of the three-dimensional structure of the limiting section in the embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the guide wire in use in an embodiment of the present application;

[0019] Figure 4 Schematic diagram of the planar structure of the limiting section in the embodiment of the present application;

[0020] Figure 5 Schematic diagram of the cross-sectional structure of the guide wire in the embodiment of the present application;

[0021] Figure 6 forFigure 5 Schematic diagram of the change state of the guide wire;

[0022] Figure 7 Schematic diagram of the cross-sectional structure of the guide wire in the embodiment of the present application;

[0023] Figure 8 For Figure 7 Schematic diagram of the change state of the guide wire.

[0024] Legend: 10. delivery segment, 20. limiting segment, 21. connecting end, 22. free end, 30. outer tube, 31. first tube body, 32. second tube body, 33. third tube body, 34. proximal end, 35. distal end, 40. inner core, 50. adapter tube, 60. support core, A. oval foramen, B. right atrium, C. left atrium. DETAILED DESCRIPTION

[0025] The present application will be further described in details by specific embodiments in conjunction with the accompanying drawings. In different embodiments, similar elements are denoted by similar element reference numbers. In the following embodiments, many details are described in order to make the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art according to the description in the specification and general technical knowledge in the art.

[0026] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that is obvious to those skilled in the art. Therefore, the order in the specification and the drawings is only for the purpose of clearly describing a certain embodiment, and does not mean that it is the necessary order, unless otherwise stated that a certain order must be followed.

[0027] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. Unless otherwise specified, the "connection" and "coupling" in the present application include direct and indirect connections (couplings).

[0028] A guide wire is provided in an embodiment of the present application, which has an anti-slip function. Taking the guide wire passing through the defect site of the foramen ovale A as an example, the advantages of the guide wire designed in the present application are explained. In addition to being used in the closure of the foramen ovale A, the guide wire designed in the present application can also be used in atrial septal defect treatment surgery, ventricular septal defect treatment surgery, mitral valve treatment surgery and arteriovenous fistula treatment surgery. The present application does not limit the specific application scenarios of the guide wire.

[0029] like Figures 1-8 As shown, the guidewire provided in the embodiment of the present application includes: a delivery segment 10 and a limiting segment 20 connected to each other. The limiting segment 20 is a multi-turn helical structure, the axis of the multi-turn helical structure is parallel to or coincides with the axis of the delivery segment 10, and the limiting segment 20 is used to pass through the foramen ovale A and be placed in the left atrium C.

[0030] The environment around the human foramen ovale A Figure 2 As shown, an unclosed foramen ovale A is formed between the septum secundum and the septum primum, with the right atrium B on one side and the left atrium C on the other. When a guidewire is used, the limiting segment 20 passes through the foramen ovale A and is placed in the left atrium C, while the delivery segment 10 is located on the right atrium B side.

[0031] The guidewire in the above embodiment includes a delivery section 10 and a limiting section 20 connected to each other. When the guidewire is used, the limiting section 20 passes through the foramen ovale A and is placed in the left atrium C on one side of the foramen ovale A. The delivery section 10 is placed in the right atrium B on the other side of the foramen ovale A. When other instruments (such as sheaths) are delivered through the delivery section 10 at a later stage, the limiting section 20 with a multi-turn spiral structure can abut against the human tissue around the left atrium C on the side of the foramen ovale A, thereby preventing the guidewire from slipping off the left atrium C on the side of the foramen ovale A, so as to facilitate other subsequent treatment operations. That is, the designed guidewire is a guidewire with an anti-slip function. When the guidewire is used for surgery, the operation time can be effectively shortened and the surgical risk can be reduced.

[0032] Specifically, the outer diameter of the guidewire can be between 0.1mm and 2mm. The limiting section 20 of the guidewire has a certain degree of flexibility. The limiting section 20 of the guidewire can be transformed from a linear structure into a multi-turn helical structure through pretreatment. For example, the limiting section 20 can be formed into a multi-turn helical structure through heat treatment. The number of turns of the limiting section 20 can be, for example, two turns, two and a half turns, three turns, three and a half turns, or other multi-turn helical structures. The diameter of the multi-turn helical structure is 5mm-60mm. This size range can ensure that the limiting section 20 passes through the defect site, for example, when passing through the foramen ovale A. The multi-turn helical structure can effectively prevent the guidewire from slipping out of the defect site, thereby reducing surgical risks.

[0033] When the guide wire is inserted into the human body, the pre-processed limiting section 20 can be first pulled into an approximately straight structure to facilitate the guide wire to penetrate the human body. The limiting section 20 passes through the foramen ovale A and is placed in the left atrium C. After the limiting section 20 passes through the foramen ovale A, it relies on its own mechanical memory to restore the pre-processed multi-turn spiral structure.

[0034] like Figures 1-3 As shown, the limiting section 20 is a conical multi-turn helical structure. When the limiting section 20 is a conical multi-turn helical structure, the limiting section 20 has a connecting end 21 and a free end 22. The radial dimension of the multi-turn helical structure decreases from the free end 22 to the connecting end 21. The end of the conveying section 10 is connected to the connecting end 21.

[0035] by Figure 2 For example, the functional principle of the limiting section 20 with a conical multi-turn spiral structure is explained. After the limiting section 20 passes through the foramen ovale A and enters the left atrium C, the conical multi-turn spiral structure can play a role in preventing slipping. When other devices are delivered through the guide wire in the later stage, when the device to be delivered is dragged back and forth, some force may be applied to the guide wire, that is, the guide wire will be pulled. At this time, the guide wire is under force and the connecting end 21 is pulled to the side close to the foramen ovale A through the delivery section 10. The axial thickness of the multi-turn spiral structure will be compressed, or even compressed into a single layer structure, such as the mosquito coil disc structure (see Figure 3 When the multi-turn spiral structure is compressed into a single layer, the contact area between the limiting segment 20 and the tissue surrounding the foramen ovale A becomes larger, thereby obtaining more supporting force, making it easier to firmly place the limiting segment 20 in the left atrium C and prevent the guidewire from slipping.

[0036] In other embodiments, Figure 4 As shown, the limiting section 20 can also be a cylindrical multi-turn spiral structure, and the two ends of the limiting section 20 are the connecting end 21 and the free end 22 mentioned above, respectively. The conveying section 10 can be connected to any one of the connecting end 21 and the free end 22, for example, the end of the conveying section 10 is connected to the free end 22.

[0037] When the limiting section 20 is a multi-turn spiral structure, Figure 2 For example, when using a guide wire, the limiting segment 20 is symmetrically distributed about the foramen ovale A, so that the limiting segment 20 can contact both the primary septum and the secondary septum of the foramen ovale A, and also facilitates the limiting segment 20 to obtain better supporting force, thereby preventing the guide wire from slipping.

[0038] like Figures 5-8As shown, in an embodiment of the present application, the conveying section 10 includes an outer tube 30 and an inner core 40. The inner core 40 is sleeved and fixed in the outer tube 30, and a gap is formed between the inner core 40 and the outer tube 30. The outer tube 30 includes a first tube body 31 and a second tube body 32 connected to each other. The first tube body 31 is located on the side away from the limiting section 20, and the second tube body 32 is located on the side close to the limiting section 20. The second tube body 32 is an elastic tube body. When liquid is filled into the interior of the conveying section 10 through the gap between the outer tube 30 and the inner core 40, the second tube body 32 expands into a spherical or sac shape. The second tube body 32 is used to abut the foramen ovale A. The material of the second tube body 32 can be selected from a compliant material. For example, the material of the second tube body 32 can be TPU, PU, ​​TPE, silicone, rubber or other elastic materials.

[0039] For ease of description, one end of the delivery section 10 is defined as the proximal end 34, and the other end is defined as the distal end 35. The proximal end 34 is close to the user operation side, that is, the proximal end 34 is located on the side away from the limiting section 20, and correspondingly, the distal end 35 is located on the side close to the limiting section 20. Before the second tube body 32 is expanded, the outer diameter of the second tube body 32 is consistent with or approximately consistent with the outer diameter of the first tube body 31. When the second tube body 32 needs to be expanded, a corresponding syringe can be connected to the proximal end 34 of the delivery section 10 to inject liquid into the interior of the delivery section 10. The liquid passes through the gap between the inner core 40 and the outer tube 30 and continuously fills the liquid so that the second tube body 32 abuts against the foramen ovale A after expansion.

[0040] When using a guidewire, the structure of the limiting section 20 can play a role in preventing slippage. However, since the guidewire is a relatively soft structure as a whole, the guidewire has limited force resistance. When the guidewire is subjected to a relatively large pulling force, the limiting section 20 may deform and be withdrawn from the foramen ovale A, thus failing to play its role in preventing slippage. In this case, to ensure the anti-slip property of the guidewire, or to enhance the anti-slip performance, a deformable second tube 32 is designed. The expanded second tube 32 is tightly abutted against the foramen ovale A, ensuring the abutment strength between the guidewire and the foramen ovale A, thereby further ensuring the anti-slip property of the guidewire.

[0041] Specifically, the first tube 31 is made of a polymer material, such as common polymers such as PEBAX, PET, PA, PE, and PVC. During use, the outer wall of the first tube 31 contacts internal structures, such as blood vessels. The polymer material reduces friction during insertion. The inner core 40 is made of metal, such as a metal with imaging capabilities, to facilitate visualization and positioning of the guidewire within the human body, ensuring optimal use.

[0042] like Figures 5-6As shown, the delivery section 10 further comprises a third tube body 33, one end of which is connected with the second tube body 32 and the other end of which is connected with the limiting section 20. The inner core 40 is a solid metal piece, or the inner core 40 is a tube structure formed by weaving or spirally winding metal wires. When the inner core 40 is a solid metal piece, the inner core 40 can be a metal rod or a metal wire. The solid inner core 40 has relatively good support and is convenient for wire shaping. When the inner core 40 is a hollow tube structure formed by weaving or spirally winding metal wires, the inner core 40 has relatively good flexibility and is convenient for wire deformation in the human body. The metal wires can be round wires or flat wires. The material of the inner core 40 is, for example, stainless steel, nickel-titanium alloy, tungsten wire, etc.

[0043] When the delivery section 10 comprises the first tube body 31, the second tube body 32 and the third tube body 33, the second tube body 32 is made of elastic material based on the requirement of expansion deformation. The materials of the first tube body 31 and the third tube body 33 can both be high polymer materials. For example, the first tube body 31 and the third tube body 33 can both be one or more layers of high polymer materials. The number of layers of the first tube body 31 and the third tube body 33 can be the same or different. The materials of the first tube body 31 and the third tube body 33 can be the same or different. For example, the first tube body 31 is two layers of high polymer materials and the third tube body 33 is three layers of high polymer materials. The extra layer of the third tube body 33 relative to the first tube body 31 can be a hydrophilic layer arranged on the outermost layer of the third tube body 33. Through the hydrophilic layer, the wire can be pushed more smoothly. The number of layers and the material selection of the outer tube 30 are specifically selected according to actual requirements, and the present application does not make specific limitations.

[0044] Specifically, the second tube body 32 and the first tube body 31 are connected by heat welding, and the second tube body 32 and the third tube body 33 are also connected by heat welding. At the same time, the second tube body 32 and the first tube body 31 can also be connected by gluing, and the second tube body 32 and the third tube body 33 can also be connected by gluing. Through heat welding and gluing, the different parts of the outer tube 30 have sufficient connection strength and ensure the stability of the connection.

[0045] As shown in the drawings, Figures 7-8 In other embodiments, the delivery section 10 further comprises a support core 60, and the inner core 40 is a tube structure, for example, a hollow tube structure formed by weaving or spirally winding metal wires. The support core 60 is fixedly sleeved in the inner core 40. At this time, the delivery section 10 of the wire has a three-layer structure, which can exert a certain flexibility through the inner core 40 and a certain support through the support core 60.

[0046] As shown in the drawings, Figure 7 More preferably, the part of the support core 60 close to the limiting section 20 is a guide section, and the guide section is located outside the second tube body 32, Figure 7L in the middle is the length corresponding to the guide section. The radial dimension of the guide section is continuously reduced from the side away from the limiting section 20 to the side close to the limiting section 20. And / or, the second tube body 32 is a conical tube, and the radial dimension of the conical tube is continuously reduced from the side away from the limiting section 20 to the side close to the limiting section 20. When the second tube body 32 is a conical tube, the main focus is on the outer wall of the second tube body 32 being conical, so that the guide wire has the flexibility to move and is convenient for moving in human blood vessels. Similarly, the guide section of the support core 60 can also increase the flexibility of the guide wire and facilitate the movement of the guide wire in human blood vessels. When the support core 60 is set, the outer tube 30 can be determined as needed to see whether the third tube body 33 is set. In other embodiments, the support core 60 may also not be provided with a guide section, and the support core 60 is a rod or wire structure with consistent radial dimensions.

[0047] Specifically, the end of the limiting section 20 is connected to the end of the guide section away from the first tube body 31. At this time, the material of the limiting section 20 can be consistent with the material of the support core 60, that is, the limiting section 20 is a structure formed by extending a section of the support core 60.

[0048] In other embodiments, the limiting section 20 can also have the same structure as the conveying section 10, except that the limiting section 20 is pre-processed relative to the conveying section 10 to form a multi-turn spiral structure. However, it should be noted that when the limiting section 20 and the conveying section 10 have the same structure, the spaces inside the limiting section 20 and the conveying section 10 are not connected, that is, they are in an isolated state. In this way, when the conveying section 10 is injected with liquid, the liquid is ensured to fill the second tube 32, facilitating rapid deformation of the second tube 32, thereby saving surgical time and reducing surgical risks.

[0049] like Figures 5-8 As shown, in an embodiment of the present application, the guidewire further includes a transfer tube 50, one end of which is sleeved with the end of the delivery section 10 away from the limiting section 20, and the other end of the transfer tube 50 is used to connect to the syringe.

[0050] The adapter tube 50 and the delivery section 10 can be connected to the delivery section 10 only when the second tube body 32 needs to be filled. For example, the adapter tube 50 can be directly sleeved on the delivery section 10 in a sleeve manner. The adapter tube 50 and the syringe can be sleeved, clamped or threaded. For example, an internal thread is provided in one end of the adapter tube 50, and the syringe is provided with an external thread. The internal thread and the external thread cooperate to realize a detachable connection between the adapter tube 50 and the syringe, and the adapter tube 50 and the syringe are connected as needed. For example, when the anti-slip effect cannot be guaranteed by relying on the limiting section 20, the syringe and the adapter tube 50 need to be connected. The syringe injects liquid into the delivery section 10 to fill the entire cavity in the delivery section 10, and then continues to fill the liquid until the second tube body 32 expands, such as Figure 6 or Figure 8As shown, this is the effect after the second tube body 32 is expanded. At this time, the second tube body 32 can be tightly fitted with the oval foramen A to prevent slipping.

[0051] The above examples are used to illustrate the present application, which are only used to help understand the present application and are not intended to limit the present application. For those skilled in the art of the present application, based on the concept of the present application, they can also make some simple deductions, modifications or substitutions.

Claims

1. A guide wire, characterized in that: include: The conveying section and the limiting section are connected; the limiting section is a multi-turn spiral structure, the axis of the multi-turn spiral structure is parallel to or coincides with the axis of the conveying section, and the limiting section is used to pass through the foramen ovale and be placed in the left atrium.

2. The guide wire according to claim 1, wherein The limiting section is a cylindrical multi-turn spiral structure, or the limiting section is a conical multi-turn spiral structure; when the limiting section is a conical multi-turn spiral structure, the limiting section has a connecting end and a free end, and the radial dimension of the multi-turn spiral structure continuously decreases from the side of the free end to the side of the connecting end, and the end of the conveying section is connected to the connecting end.

3. The guide wire according to claim 1, wherein The conveying section includes an outer tube and an inner core, and the inner core is sleeved and fixed in the outer tube; the outer tube includes a first tube body and a second tube body connected to each other, the first tube body is located on the side away from the limiting section, and the second tube body is located on the side close to the limiting section; the second tube body is an elastic tube body, and when liquid is filled into the interior of the conveying section, the second tube body expands into a spherical or sac shape, and the second tube body is used to abut against the oval foramen.

4. The guide wire according to claim 3, wherein The conveying section also includes a third tube body, one end of which is connected to the second tube body, and the other end is connected to the limiting section; the inner core is a solid metal piece, or the inner core is a tube structure formed by braiding or spirally winding metal wire.

5. The guide wire according to claim 4, wherein The second tube body and the first tube body, as well as the second tube body and the third tube body are connected by thermal welding.

6. The guide wire according to claim 3, wherein The conveying section also includes a supporting core, the inner core is a tubular structure, and the supporting core is sleeved and fixed inside the inner core.

7. The guide wire according to claim 6, wherein A section of the support core close to the limiting section is a guide section, and the guide section is located on the outside of the second tube body, and the radial dimension of the guide section continuously decreases from the side away from the limiting section to the side close to the limiting section; and / or, the second tube body is a tapered tube, and the radial dimension of the tapered tube continuously decreases from the side away from the limiting section to the side close to the limiting section.

8. The guide wire according to claim 7, wherein The end of the limiting section is connected to an end of the guiding section away from the first tube body.

9. The guide wire according to claim 3, wherein The first tube body is made of polymer material, and the inner core is made of metal material.

10. The guide wire according to any one of claims 3 to 9, characterized in that It also includes a transfer tube, one end of which is sleeved with an end of the delivery section away from the limiting section, and the other end of the transfer tube is used to be connected to the syringe.

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