Sheath tube with adjustable tube diameter and sheath core assembly

Abstract

The utility model relates to the technical field of medical treatment, and discloses a sheathing canal with an adjustable pipe diameter. The whole instrument inlet end is a cylinder, and a cylindrical through hole is formed in the center of the instrument inlet end; the one-way valve is arranged in the instrument inlet end and used for preventing liquid in the sheath tube body from flowing out of the instrument inlet end. The whole sheath body is a slender tubular body, a slender through hole is formed in the center of the sheath body, and the upper end of the sheath body is connected to the lower end of the instrument inlet end. The sheath tube body comprises a hard tube body and an elastic tube body, the hard tube body is a slender tube wall with an arc-shaped cross section on the whole, the size and the shape of the hard tube body are fixed to the slender tube wall with the arc-shaped cross section on the whole of the elastic tube body, and the elastic tube body is in a retraction state in a natural state. The elastic tube bodies expand towards the outside of the sheath tube body in the circumferential direction under the action of internal pressure, and the hard tube bodies and the elastic tube bodies are sequentially connected on the side faces to jointly form the sheath tube body with the cross section in a complete closed shape. According to the invention, wounds caused by surgical operations can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical technology field more particularly to a kind of sheath tube and sheath core assembly of adjustable pipe diameter. BACKGROUND

[0002] This section aims to provide background or context for the embodiments of the application recited in the claims. The description herein does not admit to be prior art merely because it is included in this section.

[0003] The instrument inlet end and the lower end of the existing minimally invasive operation, especially the sheath tube (cannula) of percutaneous minimally invasive operation, have fixed diameters, so the sheath tube needs to be able to accommodate the passing of the widest part of the diagnostic and therapeutic instrument at all times, and the diameter of the sheath tube must be at least 1G larger than the diameter of the diagnostic and therapeutic instrument to accommodate the passing of the diagnostic and therapeutic instrument. This is not flexible and can cause great harm to the patient's body due to the large width.

[0004] The instrument inlet end of the sheath tube lacks a sealing mechanism, which can cause the backflow of gas or liquid in the patient's body, increasing the risk of air embolism or blood spillage.

[0005] The improved sheath tube in the prior art is complex to use, so there is still a need for a sheath tube that is easy to use and can effectively solve the above problems and function when used with diagnostic and therapeutic instruments such as sheath cores. SUMMARY

[0006] The utility model aims at a kind of sheath tube and sheath core 4 assembly of adjustable pipe diameter, can reduce the trauma caused by surgical operation.

[0007] The present application discloses a sheath tube with adjustable pipe diameter, comprising an instrument inlet end 1, a one-way valve 2, and a sheath tube body 3: the instrument inlet end 1 is a cylindrical body as a whole and has a cylindrical through hole in the center; the one-way valve 2 is arranged in the instrument inlet end 1 to prevent the liquid in the sheath tube body 3 from flowing out of the instrument inlet end 1; the sheath tube body 3 is an elongated tubular body as a whole and has an elongated through hole in the center, with the upper end of the sheath tube body 3 connected to the lower end of the instrument inlet end 1.

[0008] The sheath tube body 3 comprises a hard tube body 301 and an elastic tube body 302. The hard tube body 301 is an elongated tube wall with a circular arc cross-section as a whole, and the size and shape of the hard tube body 301 are fixed. The elastic tube body 302 is an elongated tube wall with a circular arc cross-section as a whole, and the elastic tube body 302 is in a retracted state in the natural state. Under the action of internal pressure, the elastic tube body 302 expands outward in the circumferential direction of the sheath tube body 3. Multiple hard tube bodies 301 and multiple elastic tube bodies 302 are connected in sequence on the side surface, and together form the sheath tube body 3 with a complete closed cross-section.

[0009] In a preferred embodiment, the edge of the one-way valve 2 is connected to the inner wall of the instrument entry end 1; the one-way valve 2 in the closed state covers the cylindrical through hole of the instrument entry end 1 in the circumferential direction, and the one-way valve 2 in the open state is unfolded towards the sheath tube body 3, so that the through hole of the instrument entry end 1 and the elongated through hole of the sheath tube body 3 form a through structure.

[0010] In a preferred embodiment, the one-way valve 2 is divided into four circular arc sheets at the center with a cross shape as the boundary, the circular arc of the circular arc sheet is connected to the inner wall of the instrument entry end 1, and the included angle of the circular arc sheet is kept in the circumferential direction in the closed state and is extended towards the sheath tube body 3 in the open state.

[0011] In a preferred embodiment, the hard tube body 301 and the elastic tube body 302 have the same height and the same cross-sectional shape of circular arc, the hard tube body 301 has a shape of wide at the top and narrow at the bottom in the longitudinal direction, and the elastic tube body 302 has a shape of narrow at the top and wide at the bottom in the longitudinal direction.

[0012] In a preferred embodiment, the upper ends of the plurality of hard tube bodies 301 are connected to each other in the longitudinal direction.

[0013] In a preferred embodiment, one sheath tube body 3 includes four hard tube bodies 301 and four elastic tube bodies 302, each hard tube body 301 has the same shape, and each elastic tube body 302 has the same shape.

[0014] In a preferred embodiment, the instrument entry end 1 is made of hard polymer material, the one-way valve 2 is made of elastic polymer material film, the hard tube body 301 is made of hard polymer material, and the elastic tube body 302 is made of elastic polymer material film.

[0015] In a preferred embodiment, the total length of the sheath tube is 5-15 cm, and the thickness of the instrument entry end 1 is 0.2-0.6 mm.

[0016] In another aspect, the application discloses a sheath tube with a sheath core 4 assembly, which includes a sheath core 4 and the above-mentioned sheath tube with adjustable tube diameter, the needle tube 401 of the sheath core 4 passes through the through hole of the instrument entry end 1 and the elongated through hole of the sheath tube body 3 in use, and the needle tip 402 of the sheath core 4 is exposed from the elongated through hole of the sheath tube body 3.

[0017] In a preferred embodiment, the sheath core 4 is suitable for percutaneous surgery, including solid sheath core 4, hollow sheath core 4, sharp sheath core 4 and blunt sheath core 4; the sheath tube is suitable for solid sheath core 4, hollow sheath core 4, sharp sheath core 4 and blunt sheath core 4;

[0018] The instrument entry end 1 of the sheath can be fixed with the conical needle seat 403 of the sheath core 4 in use.

[0019] Compared with the prior art, the main difference and effect of the embodiments of the present application are that:

[0020] The trauma caused by surgical operation is reduced.

[0021] Further, the device is simple to use and simple in design.

[0022] Further, the device avoids puncture-related complications such as air intake or bleeding during operation, and improves the success rate of surgical operation.

[0023] It should be understood that, within the scope of the present application, the above technical features of the present application and the technical features described in detail below (such as the embodiments) can be combined with each other to form new or preferred technical solutions. Due to the limited space, they will not be listed one by one here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0025] Figure 1 (a) in the figure is a perspective view of the sheath in the expanded state according to an embodiment of the present application.

[0026] Figure 1 (b) in the figure is a perspective view of the sheath in the retracted state according to an embodiment of the present application.

[0027] Figure 2 is a top view of the sheath according to an embodiment of the present application.

[0028] Figure 3 (a) in the figure is a side view of the sheath in the expanded state according to an embodiment of the present application.

[0029] Figure 3 (b) in the figure is a side view of the sheath in the retracted state according to an embodiment of the present application.

[0030] Figure 4 (a) in the figure is a cross section of the sheath body in the expanded state according to an embodiment of the present application.

[0031] Figure 4(b) is a sheath tube cross section in retracted state according to one embodiment of the present application.

[0032] Figure 5 (a) is a sheath core according to one embodiment of the present application.

[0033] Figure 5 (b) is a sheath core assembly in use according to one embodiment of the present application.

[0034] In each figure, each sign is as follows:

[0035] 1 - instrument inlet end;

[0036] 2 - one-way valve;

[0037] 3 - sheath tube;

[0038] 301 - hard tube;

[0039] 302 - elastic tube;

[0040] 4 - sheath core;

[0041] 401 - needle tube;

[0042] 402 - needle tip;

[0043] 403 - conical needle seat. DETAILED DESCRIPTION

[0044] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one ordinarily skilled in the art that the present application can be practiced without these specific details and that numerous implementation variations and modifications can be possible.

[0045] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0046] The present application discloses a sheath tube with adjustable tube diameter, as shown in Figure 1 which comprises an instrument inlet end 1, a one-way valve 2 and a sheath tube 3: the instrument inlet end 1 is a whole cylinder with a cylindrical through hole in the center; the one-way valve 2 is arranged in the instrument inlet end 1 to prevent the liquid in the sheath tube 3 from flowing out of the instrument inlet end 1; the sheath tube 3 is a whole elongated tubular body with an elongated through hole in the center, and the upper end of the sheath tube 3 is connected to the lower end of the instrument inlet end 1; the up and down in the present application are relative concepts, and the vertical and upright direction of the sheath tube as shown in Figure 3 is taken as an example.

[0047] The sheath tube body 3 includes a rigid tube body 301 and an elastic tube body 302. The rigid tube body 301 has a slender tube wall with a circular arc cross-section. The size and shape of the rigid tube body 301 are fixed. The elastic tube body 302 has a slender tube wall with a circular arc cross-section.

[0048] like Figure 1 As shown in (b), the elastic tube 302 is in a retracted state in its natural state, as... Figure 1 As shown in (a), the elastic tube 302 expands outward in the circumferential direction under the action of internal pressure. Multiple rigid tubes 301 and multiple elastic tubes 302 are connected in sequence on the side to form a sheath tube 3 with a completely closed cross-section.

[0049] In one embodiment, the edge of the one-way flap 2 is connected to the inner wall of the instrument inlet 1; in the closed state, the one-way flap 2 covers the cylindrical through hole of the instrument inlet 1 in the circumferential direction, and in the open state, the one-way flap 2 expands toward the sheath body 3, so that the through hole of the instrument inlet 1 and the slender through hole of the sheath body 3 form a through structure.

[0050] In one embodiment, such as Figure 2 As shown, the one-way valve 2 is divided into four arc-shaped thin plates at its center, with a cross-shaped boundary. The arcs of these plates connect to the inner wall of the instrument inlet 1. The included angles of the arc-shaped plates remain circumferentially positioned when closed, and extend into the sheath body 3 when open. The one-way valve 2 has a simple design, requiring no complex special structures for opening and closing control. The valve's shape controls the instrument inlet 1 to open and adhere to the instrument only when it is inserted into the sheath body 3. This avoids puncture-related complications such as air ingress or bleeding during the procedure, improving the success rate of the surgery.

[0051] In one embodiment, the rigid tube 301 and the elastic tube 302 have the same height and both have an arc-shaped cross-section. The rigid tube 301 is wider at the top and narrower at the bottom in the longitudinal direction, while the elastic tube 302 is narrower at the top and wider at the bottom in the longitudinal direction.

[0052] In one embodiment, such as Figure 3 As shown in (a) and (b), the upper ends of the multiple rigid tubes 301 are connected to each other in the longitudinal direction.

[0053] In one embodiment, a sheath body 3 includes four rigid tube segments 301 and four elastic tube segments 302. Each rigid tube segment 301 has a consistent shape, and each elastic tube segment 302 has a consistent shape. The sheath is easy to use; its expansion and retraction are controlled by elasticity, allowing the sheath body 3 to remain in a retracted state in its natural state. Expansion only occurs when there is an instrument inside the sheath body 3, conforming to the outer periphery of the instrument, effectively reducing trauma caused by surgical procedures.

[0054] In one embodiment, the instrument entry end 1 is made of hard polymer material, the one-way valve 2 is made of elastic polymer material film, the hard tube body 301 is made of hard polymer material, and the elastic tube body 302 is made of elastic polymer material film.

[0055] In one embodiment, the total length of the sheath tube is 5-15 cm, and the thickness of the instrument entry end 1 is 0.2-0.6 mm.

[0056] In one embodiment, the diameter of the lower end of the sheath tube body 3 is less than or equal to 18G, and the diameter of the instrument entry end 1 is greater than or equal to 14G.

[0057] In another aspect, the present application discloses a sheath core assembly with a sheath tube, which comprises a sheath core 4 and the above-mentioned sheath tube with adjustable tube diameter. Figure 5 The needle tube 401 of the sheath core 4 passes through the through hole of the instrument entry end 1 and the elongated through hole of the sheath tube body 3 in use, and the needle tip 402 of the sheath core 4 is exposed from the elongated through hole of the sheath tube body 3. Figure 5 The sheath core assembly in use is shown in (b) of FIG. 4.

[0058] In one embodiment, the sheath core 4 is suitable for percutaneous surgery, including solid sheath core, hollow sheath core, sharp sheath core and blunt sheath core; the sheath core 4 is commonly used for live puncture detection, the solid sheath core and the hollow sheath core are distinguished according to the type of the needle tube 401, the solid sheath core is mostly used for prior positioning, and the hollow sheath core is mostly used for extracting liquid; the sharp sheath core and the blunt sheath core are distinguished according to the type of the needle tip 402, the sharp sheath core is used for penetrating relatively tough tissues and puncturing pathological sites, and the blunt sheath core is used for separating body organs to avoid damaging important structures.

[0059] The sheath tube in the present application is suitable for solid sheath core, hollow sheath core, sharp sheath core and blunt sheath core, and is suitable for various types of sheath cores because the instrument entry end of the sheath tube is widely matched with the conical needle seat 403 of the sheath core 4.

[0060] In use, the instrument entry end 1 of the sheath tube can be matched with the conical needle seat 403 of the sheath core 4 to be fixed.

[0061] For example, the inner diameter of the instrument entry end 1 of the sheath tube is smaller than the outer diameter of the widest part of the conical needle seat 403 of the sheath core 4 and larger than the outer diameter of the narrowest part of the conical needle seat 403, and in use, the sheath tube is fixedly connected with the conical needle seat 403.

[0062] Alternatively, the inner side of the instrument entry end 1 of the sheath tube is provided with a bayonet, and the outer side of the conical needle seat 403 of the sheath core 4 is provided with a thread, and in use, the bayonet of the sheath tube and the thread of the conical needle seat 403 are matched with each other to form a fixed connection.

[0063] It is to be understood that the phraseology or terminology such as "first" and "second", etc., used in the patent claims and specification serves only to identify the subject matter without regard to the order of its use or the order in which it is set out in the specification. It is also to be understood that the terms "comprising", "including", or any other variants thereof are intended to cover non-exclusive inclusions, such that processes, methods, articles, or apparatuses that comprise a list of elements are not required to include only those elements in the list, but can include other elements not expressly listed, or even include elements that supersede those listed elements. An element proceeded by "comprises a", "includes an", or "includes a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0064] All documents mentioned in the present application are incorporated herein by reference as if each individual document were specifically and individually indicated to be incorporated by reference. In addition, it is to be understood that the application can be carried out by specifically different embodiments and that many obvious modifications and changes can occur to those skilled in the art once armed with the above disclosure. Therefore, the foregoing description is considered as illustrative only of the principles of the application and not in limitation of the scope of the application as the application is to be given its fullest possible scope.

Claims

1. A sheath tube with adjustable tube diameter, characterized by, The sheath tube body (3) includes hard tube bodies (301) and elastic tube bodies (302), the hard tube bodies (301) are in the shape of an elongated tube wall with a circular arc cross section, the size and shape of the hard tube bodies (301) are fixed, the elastic tube bodies (302) are in the shape of an elongated tube wall with a circular arc cross section, the elastic tube bodies (302) are in a retracted state in a natural state, the elastic tube bodies (302) expand outward of the sheath tube body (3) in the circumferential direction under the action of internal pressure, and a plurality of the hard tube bodies (301) and a plurality of the elastic tube bodies (302) are connected in sequence at the side to jointly form the sheath tube body (3) with a complete closed cross section. The edge of the one-way valve (2) is connected to the inner wall of the instrument inlet end (1); the one-way valve (2) in the closed state covers the cylindrical through hole of the instrument inlet end (1) in the circumferential direction, and the one-way valve (2) in the open state is unfolded to the sheath tube body (3), so that the through hole of the instrument inlet end (1) and the elongated through hole of the sheath tube body (3) form a penetrating structure.

2. The adjustable sheath of claim 1, wherein, The one-way valve (2) is divided into four circular arc sheets with a cross shape as a boundary at the center, the circular arc of the circular arc sheets is connected to the inner wall of the instrument inlet end (1), and the included angle of the circular arc sheets is kept in the circumferential direction in the closed state and is extended to the sheath tube body (3) in the open state.

3. The adjustable sheath of claim 1, wherein, The hard tube bodies (301) and the elastic tube bodies (302) are equal in height and have a circular arc cross section, the hard tube bodies (301) are in the shape of wide at the top and narrow at the bottom in the longitudinal direction, and the elastic tube bodies (302) are in the shape of narrow at the top and wide at the bottom in the longitudinal direction.

4. The adjustable sheath of claim 1, wherein, The upper ends of the hard tube bodies (301) are connected to each other in the longitudinal direction.

5. The adjustable sheath of claim 1, wherein, One sheath tube body (3) includes four hard tube bodies (301) and four elastic tube bodies (302), each hard tube body (301) is consistent in shape, and each elastic tube body (302) is consistent in shape.

6. The adjustable sheath of claim 1, wherein, The instrument inlet end (1) is made of hard polymer material, the one-way valve (2) is made of elastic polymer material film, the hard tube bodies (301) are made of hard polymer material, and the elastic tube bodies (302) are made of elastic polymer material film.

7. The adjustable sheath of claim 1, wherein, The total length of the sheath tube is 5-15 cm.

8. The adjustable sheath of claim 1, wherein, The sheath tube body (3) includes hard tube bodies (301) and elastic tube bodies (302), the hard tube bodies (301) are in the shape of an elongated tube wall with a circular arc cross section, the size and shape of the hard tube bodies (301) are fixed, the elastic tube bodies (302) are in the shape of an elongated tube wall with a circular arc cross section, the elastic tube bodies (302) are in a retracted state in a natural state, the elastic tube bodies (302) expand outward of the sheath tube body (3) in the circumferential direction under the action of internal pressure, and a plurality of the hard tube bodies (301) and a plurality of the elastic tube bodies (302) are connected in sequence at the side to jointly form the sheath tube body (3) with a complete closed cross section.

9. A sheathed core assembly comprising: The edge of the one-way valve (2) is connected to the inner wall of the instrument inlet end (1); the one-way valve (2) in the closed state covers the cylindrical through hole of the instrument inlet end (1) in the circumferential direction, and the one-way valve (2) in the open state is unfolded to the sheath tube body (3), so that the through hole of the instrument inlet end (1) and the elongated through hole of the sheath tube body (3) form a penetrating structure. The one-way valve (2) is divided into four circular arc sheets with a cross shape as a boundary at the center, the circular arc of the circular arc sheets is connected to the inner wall of the instrument inlet end (1), and the included angle of the circular arc sheets is kept in the circumferential direction in the closed state and is extended to the sheath tube body (3) in the open state. The hard tube bodies (301) and the elastic tube bodies (302) are equal in height and have a circular arc cross section, the hard tube bodies (301) are in the shape of wide at the top and narrow at the bottom in the longitudinal direction, and the elastic tube bodies (302) are in the shape of narrow at the top and wide at the bottom in the longitudinal direction. The upper ends of the hard tube bodies (301) are connected to each other in the longitudinal direction. One sheath tube body (3) includes four hard tube bodies (301) and four elastic tube bodies (302), each hard tube body (301) is consistent in shape, and each elastic tube body (302) is consistent in shape. The instrument inlet end (1) is made of hard polymer material, the one-way valve (2) is made of elastic polymer material film, the hard tube bodies (301) are made of hard polymer material, and the elastic tube bodies (302) are made of elastic polymer material film. The total length of the sheath tube is 5-15 cm. The sheath tube body (3) includes hard tube bodies (301) and elastic tube bodies (302), the hard tube bodies (301) are in the shape of an elongated tube wall with a circular arc cross section, the size and shape of the hard tube bodies (301) are fixed, the elastic tube bodies (302) are in the shape of an elongated tube wall with a circular arc cross section, the elastic tube bodies (302) are in a retracted state in a natural state, the elastic tube bodies (302) expand outward of the sheath tube body (3) in the circumferential direction under the action of internal pressure, and a plurality of the hard tube bodies (301) and a plurality of the elastic tube bodies (302) are connected in sequence at the side to jointly form the sheath tube body (3) with a complete closed cross section. The sheath core (4) and the sheath tube with adjustable diameter as claimed in any one of claims 1-8, the needle tube (401) of the sheath core (4) passes through the through hole of the instrument inlet end (1) and the elongated through hole of the sheath tube body (3) in use, and the needle tip (402) of the sheath core (4) is exposed from the elongated through hole of the sheath tube body (3).

10. The sheath core assembly of claim 9, wherein, The sheath core (4) is suitable for percutaneous surgery, including solid sheath core, hollow sheath core, pointed sheath core and blunt sheath core; The sheath tube is suitable for solid sheath core, hollow sheath core, pointed sheath core and blunt sheath core; The instrument inlet end (1) of the sheath tube can be matched with the conical needle seat (403) of the sheath core (4) for fixation in use.

Images