A sheath and interventional device
By incorporating anisotropic support in the sheath tube body, the problem of low bending degree of existing sheath tube is solved, and the sheath tube is achieved has a higher bending effect when bending, while maintaining flexible telescopic deformation ability.
Patent Information
- Application Number
- CN202420466953.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-08
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-03-08
AI Technical Summary
When existing adjustable bent sheath tubes are bent, the degree of bending is lower than expected and the telescopic deformation ability is poor, resulting in the inflexibility of the sheath tubes in use.
A sheath tube is designed with anisotropic support member built into the tube body, and the support member is arranged in the direction of the extension of the tube body, so that the tensile modulus of the tube body can be greater than the bending modulus, thereby enhancing the bending amount of the bending part.
By implanting anisotropic support, the sheath can effectively enhance the degree of bending when bent without increasing the rigidity of the sheath, ensuring that the sheath does not undergo relatively large expansion and deformation during use.
Smart Images
Figure CN222693854U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of medical equipment, in particular to a sheath tube and an interventional instrument. Background Art
[0002] Adjustable bending sheaths have been widely used in minimally invasive interventional diagnostic and therapeutic surgeries to establish channels, deliver or retrieve instruments, input drugs or extract body fluids. Compared with ordinary sheaths, sheaths have an adjustable bending function, which is mostly driven by a control wire to bend the sheath, causing the sheath to be stretched or compressed. The amount of deformation caused by the stretching or compression of the sheath makes the bending degree of the curved part of the sheath lower than expected. Utility Model Content
[0003] In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art and provide a sheath tube that is easy to bend and deform, but has poor telescopic deformation capacity, so as to reduce the deformation amount of the sheath tube when stretched or compressed, and will not increase the rigidity of the sheath tube, thereby reducing the influence on the bending degree of the sheath tube;
[0004] In addition, an interventional instrument using the above sheath is provided.
[0005] The utility model provides the following technical solutions:
[0006] According to a first aspect of the present utility model, a sheath tube is provided, the sheath tube comprising:
[0007] A tube body, wherein the tube body has a containing channel;
[0008] A support member, wherein the support member is disposed on the tube body and extends along an extension direction of the tube body;
[0009] The support member is anisotropic and is configured to enable the tensile modulus of the tube body to be greater than the bending modulus.
[0010] Further, the support member is configured as a long strip structure;
[0011] The tube body has a first cavity extending along its extension direction, and the support member can be passed through and fixed in the first cavity.
[0012] Furthermore, the tube body has a curved section, the first cavity is configured as a stepped channel, and the large diameter section of the first cavity is located in the curved section; wherein the support member is penetrated and fixed to the large diameter section.
[0013] Furthermore, the support member is embedded in the tube body, and a van der Waals force is formed between the support member and the tube body.
[0014] Furthermore, the tube body may be made of insulating material.
[0015] Furthermore, the support member includes carbon fiber, nickel-titanium wire, steel wire rope or other materials that exhibit anisotropy in the above two directions.
[0016] Furthermore, the thickness of the hole wall of the accommodating channel is different, and the tube body further has a second cavity, which is extended along the extension direction of the tube body and is arranged at a thicker portion of the hole wall of the accommodating channel.
[0017] Furthermore, the accommodating channel and the tube body are coaxial.
[0018] Furthermore, the support member is located in a sector-shaped area with a central angle of 90° on the cross section of the tube body.
[0019] According to a second aspect of the present utility model, an interventional instrument is provided, wherein the interventional instrument comprises the sheath tube as described above.
[0020] The embodiments of the present utility model have the following advantages:
[0021] By adopting the sheath provided by the utility model, an anisotropic support is implanted, so that the sheath can be easily bent but difficult to be stretched in the extension direction of the sheath; when the bending portion of the sheath is bent, due to the limitation of the support, the tube body does not undergo tensile deformation, and the bending amount of the bending portion can be enhanced, thereby improving the bending effect while ensuring that the sheath can be used normally (without relatively large telescopic deformation).
[0022] In addition, the utility model also relates to an interventional instrument. Since the above-mentioned sheath has the above-mentioned technical effects, the interventional instrument including the sheath should have the same technical effects, which will not be repeated here.
[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 A schematic structural diagram of a sheath tube provided in the first embodiment of the present utility model from one viewing angle is shown;
[0026] Figure 2A schematic structural diagram of the sheath tube provided in the first embodiment of the utility model from another perspective is shown;
[0027] Figure 3 A schematic structural diagram of a sheath tube provided in the second embodiment of the present utility model from one viewing angle is shown;
[0028] Figure 4 A schematic structural diagram of a sheath tube provided in Embodiment 3 of the present utility model from one viewing angle is shown;
[0029] Figure 5 A schematic structural diagram of the sheath tube provided in the third embodiment of the present utility model from another perspective is shown.
[0030] Description of main component symbols:
[0031] 100 - tube body; 110 - accommodating channel; 200 - supporting member; 210 - first cavity; 211 - large diameter section; 212 - small diameter section. DETAILED DESCRIPTION
[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0037] In the related technology, adjustable bending sheaths have been widely used in minimally invasive interventional diagnosis and treatment surgeries to establish channels, transport or recover instruments, input drugs or extract body fluids. Compared with ordinary sheaths, sheaths have an adjustable bending function, which is mostly driven by a control wire to bend the sheath, which will cause the sheath to be stretched or compressed. The amount of deformation caused by the stretching or compression of the sheath makes the bending degree of the curved part of the sheath lower than expected.
[0038] like Figure 1 and Figure 2 As shown, in order to solve the above technical problems, according to the first aspect disclosed in the first embodiment of the utility model, a sheath tube is provided, which includes a tube body 100 and a support member 200, the tube body 100 has a accommodating channel 110, the support member 200 is arranged on the tube body 100, and the support member 200 is extended along the extension direction of the tube body 100; wherein the support member 200 exhibits anisotropy, and the support member 200 is configured to: enable the tensile modulus of the tube body 100 to be greater than the bending modulus.
[0039] It is easy to understand that the tube body 100 is a medical hose with elastic deformation capability. The tube body 100 has a receiving channel 110, and the interventional instrument can be inserted into the receiving channel 110. It should be noted that the support member 200 is not arranged in the receiving channel 110 to avoid compressing the space of the receiving channel 110 to accommodate the tip bending portion, so that there is a gap between the interventional instrument and the receiving channel 110. The gap can reduce the bending resistance of the bending section, and because both the interventional instrument and the sheath tube will undergo expected large-scale flexural deformation, the gap is set to prevent jamming.
[0040] Optionally, the tube body 100 has a smaller surface friction coefficient, thereby reducing the friction resistance between the interventional instrument and the tube body 100 , and can further reduce the probability of a jam between the interventional instrument and the tube body 100 .
[0041] Among them, by arranging the support member 200 in the tube body 100, and because the support member 200 is anisotropic, it is configured so that the support member 200 can be easily bent and difficult to stretch. Obviously, the tube body 100 configured with the support member 200 is also difficult to be stretched or compressed in its extension direction (i.e., axial direction), and is easy to be bent in the radial direction of the tube body 100, which is due to the different tensile modulus and bending modulus of the support member 200 in the tube body 100.
[0042] Obviously, since the tensile or compressive deformation of the tube body 100 is limited, when the interventional instrument is bent, the tube body 100 will not be stretched or compressed, so the force on the bending portion at the tip will not be reduced.
[0043] By using the sheath provided by the utility model, an anisotropic support is implanted, so that the sheath can be easily bent but difficult to be stretched in the extension direction of the sheath; when the bending portion of the sheath is bent, due to the limitation of the support, the tube body does not undergo tensile deformation, and the bending amount of the bending portion can be enhanced, thereby improving the bending effect while ensuring that the sheath can be used normally (without relatively large telescopic deformation).
[0044] like Figure 3 As shown, in the second embodiment provided by the present application, on the basis of the above embodiment, the support member 200 is configured as a long strip structure; the tube body 100 has a first cavity 210 extending along its extension direction, and the support member 200 can be passed through and fixed in the first cavity 210.
[0045] That is to say, the tube body 100 has a first lumen 210 and a receiving channel 110, the receiving channel 110 is used to insert the internal cables of the endoscope or the contents of the interventional instrument, and the first lumen 210 is used to install the support member 200. The present application can pre-set the first lumen 210 on the side wall of the tube body 100, and then fix the long strip support member 200 in the first lumen 210. Among them, the fixing structure between the support member 200 and the tube body 100 can be a single-sided fixation, and of course it can also be set to a double-sided fixation or a full-section fixation. The fixing form is not specifically limited here, for example, it can be fixed by gluing, or by interference fit.
[0046] For example, the first cavity 210 may be formed synchronously during the extrusion molding process of the tube body 100 , and the first cavity 210 may be expanded a second time as required later to meet the needs of installing the support member 200 .
[0047] like Figure 4 and Figure 5As shown, the third embodiment provided by the present application is based on the above embodiments, the tube body 100 has a curved section, the contents are located in the curved section, the first cavity 210 is configured as a stepped channel, and the large diameter section 211 of the first cavity 210 is located at or beyond the curved section, that is, the length of the large diameter section is equal to or longer than the curved section; wherein the support member 200 is passed through and fixed to the large diameter section 211.
[0048] The first cavity 210 is set as a stepped channel, that is, the first cavity 210 has a large diameter section 211 and a small diameter section 212, and correspondingly, the large diameter section 211 and the small diameter section 212 are respectively set at opposite ends of the tube body 100. It should be noted that only the portion of the tube body 100 close to the tip bending portion affects the bending effect of the tip bending portion, so it can be seen that only the support member 200 is set in the large diameter section 211, and there is no need to expand the first cavity 210 as a whole, which reduces the processing amount, and can reduce the use of the support member 200, thereby reducing the cost.
[0049] In addition, since the small-diameter section 212 is not filled with the support member 200 , the small-diameter section 212 remains hollow, which can reduce the bending stress of the tube body 100 , that is, the tube body 100 can be bent more easily.
[0050] For example, the cross section of the support member 200 can be set to be square, circular, elliptical, etc., which is not specifically limited here. Among them, the number of the support members 200 can be multiple and arranged in parallel, or can be selected to be set to a single one, as long as it can meet the actual requirements.
[0051] It is easy to understand that if the design does not require the anisotropic support member 200 to fill the entire tube body 100, the diameter of the first cavity 210 can be reduced in the design of the first cavity 210, and the first cavity 210 with a stepped shape can be processed later through the tube expansion process. Similarly, the end face of the support member 200 made of anisotropic material is fixedly connected to the end face of the tube body 100. Specifically, the connection method between the end face of the support member 200 and the end face of the tube body 100 can refer to the above-mentioned gluing and other methods, which will not be repeated here.
[0052] like Figure 1 and Figure 2 As shown, in the third embodiment provided by the present application, on the basis of the above embodiments, the support member 200 is embedded in the tube body 100, and a gap is formed in the support member 200, and the side wall portion of the tube body 100 is located in the gap, so that a van der Waals force is formed between the support member 200 and the tube body 100.
[0053] The tube body 100 has a first cavity 210 which is set through, and the support member 200 is embedded in the first cavity 210 by a composite process, and the support member 200 is concentrated in the first cavity 210. The support member 200 is anisotropic in overall performance, that is, it is difficult to be stretched axially, but easy to be bent.
[0054] The support member 200 is directly carried by the tube body 100 when the polymer is extruded, and the gap in the support member 200 is infiltrated and filled with the fluid material of the polymer. After extrusion, it is cooled to form Van der Waals force to fix the support member 200.
[0055] For example, the support member 200 may be formed by a plurality of strips of anisotropic materials arranged in parallel, and a gap is formed between the plurality of adjacent strips of materials, so that when the pipe is extruded, the polymer fluid material of the pipe body 100 will fill the gap to stably fix the support member 200 in the pipe body 100. In other words, the support member 200 is fixed to the pipe body 100 by van der Waals force.
[0056] On the basis of the above embodiment, the tube body 100 is made of insulating material. That is to say, the tube body 100 has an insulating function, can isolate the power supply, and can be used for the insulation of active medical devices. For example, the active medical device is an endoscope, and the outer skin content of the active medical device is passed through the accommodating channel 110 of the tube body 100. In contrast, there is no need to add an outermost insulating tube to achieve insulation. This solution can reduce the total outer diameter of the active medical device, which is conducive to inserting the active medical device into the human body.
[0057] On the basis of the above-mentioned embodiment, the support member 200 includes carbon fiber, nickel-titanium wire, steel wire rope or other materials that exhibit anisotropy in the above-mentioned two directions.
[0058] For example, the support member 200 is made of a strip material having such properties, such as carbon fiber, nickel titanium wire, steel wire rope, etc., wherein the bending modulus of carbon fiber is very low, the nickel titanium wire has pseudo elasticity in the bending direction, and the bending modulus of steel wire rope is very low and it is relatively difficult to be stretched and deformed in the axial direction. It should be noted that the material is not limited to these materials, and other materials that can achieve the same effect can also be used.
[0059] Optionally, the support member 200 is formed by a plurality of steel wires arranged in parallel. Similarly, the support member 200 can also be arranged to be formed by a plurality of carbon fibers or nickel-titanium wires arranged in parallel. Alternatively, the support member 200 is formed by a plurality of carbon fibers, a plurality of nickel-titanium wires and a plurality of steel wires arranged in parallel. Alternatively, the support member is arranged by a single steel wire, which can also meet the use requirements.
[0060] like Figure 5As shown, based on the above embodiment, the thickness of the hole wall of the accommodating channel 110 is different, and the tube body 100 also has a second cavity, which is extended along the extension direction of the tube body 100 and is arranged in the thicker part of the hole wall of the accommodating channel 110.
[0061] For example, the first cavity 210, the second cavity and the accommodating channel 110 are arranged in parallel. By arranging the second cavity on the tube wall of the tube body 100, the bending stress of the tube body 100 can be further reduced, making the tube body 100 easier to bend and deform, and saving materials. In particular, when the accommodating channel 110 and the tube body 100 are in a non-coaxial state, it is inevitable that the thickness of the tube wall of the tube body 100 is uneven at various locations. Obviously, the bending stress at different thicknesses of the tube wall is different. By arranging the second cavity on the side of the tube wall of the tube body 100 with a thicker tube wall, the bending modulus at the thicker tube wall can be reduced, making it easier to bend.
[0062] like Figure 2 As shown, on the basis of the above embodiment, the tube body 100 has a containing channel 110, and the containing channel 110 and the tube body 100 are coaxial; wherein the containing channel 110 is used to contain the contents.
[0063] The accommodating channel 110 is used for the contents to pass through, and the larger the inner diameter is, the more conducive it is to reducing the friction and parasitic friction between the contents and the surface. It should be noted that the accommodating channel 110 and the tube body 100 are coaxial, which can ensure that the thickness of the tube wall of the tube body 100 is roughly the same at all locations, that is, the bending stress at all locations of the tube body 100 is roughly equal, which is conducive to the bending of the tube body 100.
[0064] It should be noted that the support member 200 and the tube body 100 are extruded and integrated to ensure that the accommodating channel 110 is coaxial with the tube body 100. If the support member 200 is installed by subsequently expanding the hole to form the first cavity 210, it is difficult to ensure that the accommodating channel 110 is coaxial with the tube body 100 because the first cavity 210 needs to be expanded later. Sufficient processing allowance needs to be reserved on the tube wall to avoid affecting the accommodating channel 110 when processing the first cavity 210.
[0065] On the basis of the above embodiment, the support member 200 is located in a sector-shaped area with a central angle of 90° on the cross section of the tube body 100 .
[0066] That is to say, it is not advisable to set the support member 200 on the cross section of the tube body 100 beyond the fan-shaped area with a central angle of 90° on the cross section of the tube body 100. If the support member 200 is set on the cross section of the tube body 100 beyond the fan-shaped area with a central angle of 90° on the cross section of the tube body 100, for example, within the range of 90°-180°, the support member 200 will slightly affect the bending of the tube body 100; above 180°, the support member 200 will greatly affect the bending of the tube body 100 or cause the tube body 100 to be unable to bend.
[0067] According to a second aspect of the present utility model, an interventional instrument is provided, the interventional instrument comprising a sheath.
[0068] Since the above-mentioned sheath has the above-mentioned technical effects, the interventional device including the sheath should have the same technical effects, which will not be repeated here.
[0069] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.
[0070] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. A sheath tube, characterized in that: The sheath tube comprises: A tube body, wherein the tube body has an accommodating channel; A support member, wherein the support member is disposed on the tube body and extends along an extension direction of the tube body; The support member is anisotropic and is configured to enable the tensile modulus of the tube body to be greater than the bending modulus.
2. The sheath tube according to claim 1, characterized in that: The support member is configured as a long strip structure; The tube body has a first cavity extending along its extension direction, and the support member can be passed through and fixed in the first cavity.
3. The sheath tube according to claim 2, characterized in that: The tube body has a curved section, the first cavity is configured as a stepped channel, and the large diameter section of the first cavity is located in the curved section; wherein the support member is penetrated and fixed to the large diameter section.
4. The sheath tube according to claim 1, characterized in that: The tube body is made of insulating material.
5. The sheath tube according to any one of claims 1 to 4, characterized in that: The support member includes at least one of carbon fiber, nickel-titanium wire and steel wire rope.
6. The sheath tube according to any one of claims 1 to 4, characterized in that: The thickness of the hole wall of the accommodating channel is different. The tube body further has a second cavity, which is extended along the extension direction of the tube body and is arranged at a thicker part of the hole wall of the accommodating channel.
7. The sheath tube according to any one of claims 1 to 4, characterized in that: The accommodating channel and the tube body are coaxial.
8. The sheath tube according to claim 1, characterized in that: The support member is located in a sector-shaped area with a central angle of 90° on the cross section of the tube body.
9. An interventional device, characterized in that: The interventional instrument comprises the sheath according to any one of claims 1 to 8.