Medical sheath, ureteral guiding sheath and ureteral surgical system

Abstract

The present invention discloses a medical sheath, a ureteral guiding sheath and a ureteral surgical system, which relate to the field of medical devices. The structure of the present invention is novel and reasonable. By providing a main channel, the basic guiding function of the sheath can be realized. By providing a secondary channel, the functions of fluid perfusion or passage of surgical instruments through the sheath can be satisfied. At the same time, since the free part of the secondary channel can be deformed according to different application scenarios, the closable function of the secondary channel is realized. The secondary channel is arranged on the outer wall of the sheath body and will not increase the outer diameter of the sheath body. The secondary channel is arranged on the inner wall of the sheath body and will not occupy the space of the main channel in the sheath body, effectively avoiding the influence of the secondary channel on the normal passage of instruments or fluids in the main channel, and meeting the clinical requirements of minimizing the outer diameter of the sheath and maximizing the inner diameter of the sheath as much as possible.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a medical sheath, a ureteral guiding sheath and a ureteral surgical system. Background Art

[0002] In the medical field, common sheaths include arterial sheaths and ureteral sheaths, etc., which are mainly used to provide a passage for related surgical materials or instruments.

[0003] Taking the ureteral sheath as an example, it is mostly used in urological surgeries (such as urinary lithotomy surgeries) and can provide a passage for related surgical instruments such as endoscopes. Among them, the ureteral sheath with perfusion function is the most widely used; however, since the perfusion channel added on the sheath is often a rigid channel, setting it on the outer wall of the sheath will increase the overall outer diameter of the sheath, reduce the adaptability of the sheath to human body cavities such as the ureter, and increase the surgical difficulty and surgical risk; while setting the perfusion channel on the inner wall of the sheath will sacrifice the internal space of the sheath, affect the passing performance of surgical instruments, etc. inside the sheath, and affect the surgical effect and surgical efficiency.

[0004] In summary, no matter which perfusion channel design scheme on the existing sheath can meet the clinical requirements: the outer diameter of the sheath is as small as possible and the inner diameter of the sheath is as large as possible. Therefore, it is necessary to propose a new design scheme for the medical sheath to overcome the drawbacks of the existing sheath. Summary of the Invention

[0005] The purpose of the present invention is to provide a medical sheath, a ureteral guiding sheath and a ureteral surgical system to solve the problem that the perfusion channel design scheme on the existing sheath cannot meet the clinical requirements: the outer diameter of the sheath is as small as possible and the inner diameter of the sheath is as large as possible.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention provides a medical sheath, including a sheath body, and the sheath body has:

[0008] A main channel, which is opened in the sheath body and is used for allowing fluids or surgical instruments to pass through;

[0009] A secondary channel, including a deformable free portion and a connecting portion in contact with the sheath body, and the secondary channel has a channel inlet and a channel outlet; when the secondary channel is in an initial closed state, filling with fluids or surgical instruments can cause the free portion to deform to open the secondary channel to an open state; when the secondary channel is in an initial open state, being subjected to an external force can cause the free portion to deform to squeeze the secondary channel to a closed state.

[0010] Optionally, the main channel extends along the axial direction of the sheath body and penetrates through both axial ends of the sheath body.

[0011] Optionally, the secondary channel is formed by connecting at least one long and thin sheet-shaped secondary channel component to the tube wall of the sheath body. The connection part between the secondary channel component and the sheath body forms the connecting part, and the remaining part of the secondary channel component constitutes the free part; the channel inlet is opened at a position near the first axial end of the sheath body of the secondary channel, and the channel outlet is opened at a position near the second axial end of the sheath body of the secondary channel.

[0012] Optionally, the secondary channel is formed by sleeving or externally sleeving a long thin-walled tubular secondary channel component inside the sheath body. The connection part between the secondary channel component and the tube wall of the sheath body forms the connecting part, and the remaining part of the secondary channel component constitutes the free part; the channel inlet is opened at a position near the first axial end of the sheath body of the secondary channel, and the channel outlet is opened at a position near the second axial end of the sheath body of the secondary channel.

[0013] Optionally, the secondary channel is formed by connecting at least one thin-walled fire hose-shaped secondary channel component to the tube wall of the sheath body. The connection part between the secondary channel component and the sheath body forms the connecting part, and the tube wall of the secondary channel component constitutes the free part; the channel inlet is opened at a position near the first axial end of the sheath body of the secondary channel, and the channel outlet is opened at a position near the second axial end of the sheath body of the secondary channel.

[0014] Optionally, the secondary channel component is integrally formed with the sheath body.

[0015] Optionally, the secondary channel is composed of a thin-walled protruding part co-extruded with the sheath body. The thin-walled protruding part serves as the free part and protrudes into or out of the cavity of the sheath body.

[0016] Optionally, the secondary channel extends along the axial direction of the sheath body, and the secondary channel is arranged on the outer wall or inner wall of the sheath body, or is arranged on both the outer wall and inner wall of the sheath body simultaneously.

[0017] Optionally, the secondary channel component is integrally formed with the sheath body.

[0018] Optionally, the secondary channel component is folded at the second axial end of the sheath body to form a folded part. The folded part wraps the second axial end of the sheath body from both inside and outside, and the channel outlet is opened on the folded part.

[0019] Optionally, the channel outlets are distributed at least at one of a first position, a second position, and a third position of the folding portion; wherein the first position is on the portion of the folding portion located on the outer wall of the sheath body, the second position is on the portion of the folding portion located on the inner wall of the sheath body, and the third position is at the folding place of the folding portion.

[0020] Optionally, both ends of the secondary channel component extend to the axial two ends of the sheath body respectively, and are not longer than the axial two ends of the sheath body.

[0021] Optionally, the connecting portion is composed of one or a combination of a dot-shaped connecting portion, a sheet-shaped connecting portion, and a linear connecting portion.

[0022] Optionally, a temperature sensor and / or a pressure sensor are further provided on the sheath body.

[0023] Optionally, one secondary channel is provided on the sheath body; or, a plurality of secondary channels are provided on the sheath body along its circumferential direction.

[0024] Optionally, a plurality of secondary channels are evenly distributed on the sheath body along its circumferential direction.

[0025] Optionally, one end of the sheath body for extending into a human body cavity is provided as a bendable section.

[0026] Optionally, the medical sheath is a vascular sheath, an airway sheath, a lacrimal duct sheath, an ear canal sheath, a digestive tract sheath, or a ureter sheath.

[0027] Optionally, a hydrophilic coating is attached to the inner wall surface and / or the outer wall surface of the sheath body.

[0028] The present invention also provides a ureter guiding sheath, which includes a connector and the medical sheath as described above. A guiding channel is provided on the connector. One end of the guiding channel is sleeved on one axial end of the sheath body through a pipe connection structure, and a buffer cavity for sealingly docking with the channel inlet is provided on the pipe connection structure; a perfusion port communicated with the buffer cavity and a fluid discharge port communicated with the main channel are further provided on the connector.

[0029] Optionally, a pressure regulating structure is provided on the fluid discharge port.

[0030] Optionally, the buffer cavities are arranged in one-to-one correspondence with the secondary channels, and all the buffer cavities are isolated from each other. Any one of the buffer cavities is correspondingly communicated with one perfusion port;

[0031] Or, the buffer cavity is a continuous annular channel arranged along the circumferential direction of the sheath body, and the channel inlet of any one of the secondary channels is communicated with the buffer cavity.

[0032] Optionally, one end of the sheath body facing away from the tube connection structure is provided as a bendable section, and the ureteral guiding sheath further includes a bending adjustment mechanism for controlling the bending degree of the bendable section.

[0033] Optionally, the bending adjustment mechanism is arranged on the connector.

[0034] The present invention also provides a ureteral surgical system, including the ureteral guiding sheath as described above, and further including at least one of a perfusion device, an endoscope, a lithotripsy optical fiber, a long conical inner core, a negative pressure suction device, and a guide wire.

[0035] Optionally, the ureteral guiding sheath includes a long conical inner core, and the long conical inner core is sleeved in the main channel of the medical sheath.

[0036] Optionally, the front end of the long conical inner core is attached with a hydrophilic coating.

[0037] The present invention has achieved the following technical effects compared with the prior art:

[0038] The medical sheath proposed by the present invention has a novel and reasonable structure. By setting the main channel, the basic guiding function of the sheath can be realized, mainly for medical devices to pass through, providing guidance, protection and other corresponding functions for medical devices located therein, such as various flexible endoscopes, various rigid endoscopes, various non-endoscopic catheters, etc.; by setting the secondary channel, the functions of fluid perfusion or surgical instrument passing of the sheath can be satisfied. At the same time, since the free part of the secondary channel can be deformed according to different application scenarios, the closable function of the secondary channel is realized. When the secondary channel is opened, its normal channel function can be retained. When the secondary channel is closed, its easily deformable free part can be deformed to fit the wall of the sheath body (inner wall or outer wall). This results in that when the secondary channel is arranged on the outer wall of the sheath body, it will not increase the outer diameter of the sheath body, and when the secondary channel is arranged on the inner wall of the sheath body, it will not occupy the space of the main channel inside the sheath body, effectively avoiding the influence of the secondary channel on the normal passing of instruments or fluids in the main channel, meeting the clinical requirements of minimizing the outer diameter of the sheath and maximizing the inner diameter of the sheath.

[0039] In some technical solutions disclosed by the present invention, the distal end of the medical sheath is provided with a bendable section. By adopting the bendable design, the problem that the traditional sheath cannot be bent and causes damage to human body cavities such as ureters and blood vessels is overcome. At the same time, the problem that the intraoperative lavage fluid drainage is not smooth due to the improper placement of the sheath can be avoided, improving the efficiency and safety of the operation.

[0040] The ureteral guiding sheath proposed by the present invention includes the above-mentioned medical sheath and has all the characteristics of the medical sheath, which will not be elaborated here.

[0041] The ureteral surgical system proposed by the present invention has the above-mentioned ureteral guiding sheath, which has all the characteristics of a medical sheath tube, and will not be elaborated here specifically. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a schematic diagram of the overall structure of the ureteral surgical system disclosed in the embodiments of the present invention;

[0044] Figure 2 is Figure 1 a schematic diagram of the cross-sectional structure of the ureteral surgical system in

[0045] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0046] Figure 4 It is a schematic diagram of the overall structure of the ureteral guiding sheath without a bending adjustment mechanism disclosed in the embodiments of the present invention;

[0047] Figure 5 is Figure 4 a schematic diagram of the cross-sectional structure of the ureteral guiding sheath in

[0048] Figure 6 It is a schematic diagram of the overall structure of the ureteral guiding sheath with a bending adjustment mechanism disclosed in the embodiments of the present invention;

[0049] Figure 7 is Figure 6 a schematic diagram of the cross-sectional structure of the ureteral guiding sheath in

[0050] Figure 8 is Figure 7 an enlarged schematic diagram of part B in

[0051] Figure 9 It is a schematic diagram of the principle of water outlet at the end of the secondary channel in the sheath tube body disclosed in the embodiments of the present invention;

[0052] Figure 10 It is a schematic diagram of the principle of water outlet at the outer side of the secondary channel in the sheath tube body disclosed in the embodiments of the present invention;

[0053] Figure 11 It is a schematic diagram of the principle of simultaneous water outlet at the end and the outer side of the secondary channel in the sheath tube body disclosed in the embodiments of the present invention;

[0054] Figure 12 Schematic diagram of the structure where the secondary channel disclosed in the embodiment of the present invention is arranged on the inner wall of the sheath body;

[0055] Figure 13 Schematic diagram of the structure where the secondary channel disclosed in the embodiment of the present invention is arranged on the outer wall of the sheath body;

[0056] Figure 14 Schematic cross-sectional structure diagram of the sheath body disclosed in the embodiment of the present invention;

[0057] Figure 15 Schematic diagram of the structure where the folding part disclosed in the embodiment of the present invention is provided with a channel outlet at the folding position;

[0058] Figure 16 is Figure 15 Schematic diagram of the water outlet principle of the shown channel outlet setting method;

[0059] Figure 17 Schematic diagram of the structure where the folding part disclosed in the embodiment of the present invention is provided with channel outlets at the folding position and outside at the same time;

[0060] Figure 18 is Figure 17 Schematic diagram of the water outlet principle of the shown channel outlet setting method;

[0061] Figure 19 Schematic diagram of the structure where the folding part disclosed in the embodiment of the present invention is provided with channel outlets at the folding position and outside at the same time, and the channel outlets are spirally distributed outside the folding part;

[0062] Figure 20 is Figure 19 Schematic diagram of the water outlet principle of the shown channel outlet setting method;

[0063] Figure 21 Schematic diagram of the structure where a secondary channel is arranged on the inner wall of the sheath body and a folding part is formed in the embodiment of the present invention;

[0064] Figure 22 is Figure 21 Enlarged structure diagram at position C in

[0065] Figure 23 When the secondary channel component disclosed in the embodiment of the present invention is a long thin sheet channel component, Figure 21 Schematic D-D cross-sectional structure diagram;

[0066] Figure 24 When the secondary channel component disclosed in the embodiment of the present invention is a long thin-walled tubular channel component, Figure 21 Schematic D-D cross-sectional structure diagram;

[0067] Figure 25When the secondary channel component disclosed in the embodiment of the present invention is a thin-walled fire hose-shaped channel component, Figure 21 Schematic diagram of the D-D cross-sectional structure;

[0068] Figure 26 Schematic diagram of the cross-sectional structure when the secondary channels disclosed in the embodiments of the present invention are evenly distributed in a circumferential manner on the inner wall of the sheath body;

[0069] Figure 27 Schematic diagram of the cross-sectional structure when the secondary channels disclosed in the embodiments of the present invention are evenly distributed in a circumferential manner on the outer wall of the sheath body;

[0070] Figure 28 Schematic diagram of the structure when the connecting part of the secondary channel disclosed in the embodiment of the present invention is a linear connecting part;

[0071] Figure 29 Schematic diagram of the structure when the connecting part of the secondary channel disclosed in the embodiment of the present invention is a dot-shaped connecting part;

[0072] Figure 30 Schematic diagram of the structure when the connecting part of the secondary channel disclosed in the embodiment of the present invention is a sheet-shaped connecting part;

[0073] Figure 31 Schematic diagram of the operation when the guide wire is inserted into the renal pelvis according to the embodiment of the present invention;

[0074] Figure 32 Schematic diagram of the operation when the ureteral guiding sheath is inserted into the renal pelvis along the guide wire according to the embodiment of the present invention;

[0075] Figure 33 Schematic diagram after the ureteral guiding sheath is inserted into the renal pelvis according to the embodiment of the present invention;

[0076] Figure 34 Schematic diagram when the sheath body of the ureteral guiding sheath reaches the calculus according to the embodiment of the present invention;

[0077] Figure 35 Schematic diagram of the operation when the lithotripsy optical fiber enters the renal pelvis along the main channel of the sheath body;

[0078] Figure 36 Schematic diagram of the operation when the distal end of the endoscope exits the sheath body according to the embodiment of the present invention.

[0079] Among them, the reference numerals are:

[0080] 100, ureteral surgical system; 200, ureteral guiding sheath;

[0081] 1, sheath body; 11, sensor mounting hole; 12, flexible section;

[0082] 2. Main channel;

[0083] 3. Secondary channel; 31. Free part; 32. Connecting part; 321. Dot-like connecting part; 322. Sheet-like connecting part; 323. Linear connecting part; 33. Channel entrance; 34. Channel exit; 35. Long thin sheet channel component; 36. Long thin-walled tubular channel component; 37. Thin-walled fire hose-like channel component; 38. Folding part;

[0084] 4. Connector; 41. Guide channel; 42. Pipe connection structure; 421. Buffer cavity; 43. Infusion port; 44. Fluid discharge port; 45. Pressure regulating structure; 46. Sealing cap;

[0085] 5. Bending adjustment mechanism; 51. Traction rope;

[0086] 6. Long conical inner core;

[0087] 7. Renal pelvis;

[0088] 8. Guide wire. Specific embodiments

[0089] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0090] One of the purposes of the present invention is to provide a medical sheath tube to solve the problem that the design scheme of the perfusion channel on the existing sheath tube cannot meet the clinical requirements: the outer diameter of the sheath tube is as small as possible, and the inner diameter of the sheath tube is as large as possible.

[0091] Another purpose of the present invention is also to provide a ureteral guiding sheath having the above-mentioned medical sheath tube.

[0092] Another purpose of the present invention is also to provide a ureteral surgical system having the above-mentioned ureteral guiding sheath.

[0093] To make the above purposes, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0094] Embodiment 1

[0095] As Figures 1 to 14As shown in the figure, this embodiment provides a medical sheath tube, which includes a sheath tube body 1. The sheath tube body 1 is provided with a main channel 2 and a secondary channel 3 at the same time. Among them, the main channel 2 is opened inside the sheath tube body 1 to form the inner cavity of the sheath tube body 1. The main channel 2 is generally arranged along the axial direction of the sheath tube body 1 and is used for fluid or surgical instruments to pass through; the secondary channel 3 includes a free part 31 that is easy to deform and a connecting part 32 that is in contact connection with the sheath tube body 1. The secondary channel 3 has a channel inlet 33 and a channel outlet 34. When the initial state of the secondary channel 3 is a closed state, filling the fluid or surgical instrument into it through the channel inlet 33 can cause the free part 31 to deform to expand the secondary channel 3 to an open state. On the contrary, when the initial state of the secondary channel 3 is an open state, being subjected to external force (when the secondary channel 3 is arranged on the inner wall of the sheath tube body 1, the so-called "external force" is the extrusion force generated on the secondary channel 3 when the fluid or surgical instrument is normally introduced into the main channel 2; when the secondary channel 3 is arranged on the outer wall of the sheath tube body 1, the so-called "external force" is the extrusion force of the natural body cavity on the outer periphery of the sheath tube body 1) can cause the free part 31 to deform to squeeze the secondary channel 3 to a closed state. The above-mentioned medical sheath tube can realize the basic guiding function of the sheath tube by setting the main channel 2, mainly for medical devices to pass through, and provide guidance, protection and other corresponding functions for medical devices located therein, such as various flexible endoscopes, various rigid endoscopes, various non-endoscopic catheters, etc.; by setting the secondary channel 3 outside the main channel 2, the fluid perfusion or auxiliary instrument passing function of the sheath tube can be satisfied. At the same time, since the free part 31 of the secondary channel 3 can deform according to different application scenarios, the closable function of the secondary channel 3 is realized. When the secondary channel 3 is opened, its normal channel function is retained. When the secondary channel 3 is closed, its easily deformable free part 31 can deform to fit the tube wall (inner wall or outer wall) of the sheath tube body 1. This results in that when the secondary channel 3 is arranged on the outer wall of the sheath tube body 1, it will not expand the outer diameter of the sheath tube body 1, and when the secondary channel 3 is arranged on the inner wall of the sheath tube body 1, it will not occupy the space of the main channel 2 inside the sheath tube body 1, effectively avoiding the influence of the secondary channel on the normal passage of instruments or fluids in the main channel 2. It should be noted that according to actual use requirements, the fluids that can pass through the main channel 2 and the secondary channel 3 may be the same or different. The fluid can be a liquid state, a liquid-solid mixed state or a paste state with fluidity. The secondary channel 3 is mainly filled with perfusion fluid, and the main channel 2 generally passes through a flushing fluid or perfusion fluid containing impurities such as stones and diseased tissues.

[0096] The aforementioned closed state of the secondary channel 3 does not mean that the communication state of the channel inlet 33 and the channel outlet 34 of the secondary channel 3 to the outside is closed, but refers to the disappearance of the internal space of the secondary channel 3, so as not to occupy the internal space of the main channel 2 or expand the outer diameter of the sheath tube body 1.

[0097] In this embodiment, both ends of the main channel 2 are open. The openings at both ends of the main channel 2 can be respectively located at the axial two ends of the sheath body 1 (that is, the two ends of the main channel 2 penetrate through the axial two ends of the sheath body 1 respectively). At this time, the sheath body 1 is a pipe with openings at both axial ends. The sheath body 1 can also have at least one end closed, and the opening of the main channel 2 at the corresponding end is opened on the side wall of the sheath body 1 near the closed end. As a preferred solution, the two ends of the main channel 2 in this solution penetrate through the axial two ends of the sheath body 1 respectively, and the channel wall of the main channel 2 is the inner wall of the sheath body 1. The average cross-sectional area or internal volume of the main channel 2 in the use state is larger than that of the secondary channel 3.

[0098] In this embodiment, the secondary channel 3 can be provided only on the outer wall of the sheath body 1, or only on the inner wall of the sheath body 1, or can be provided on both the inner and outer walls of the sheath body 1 at the same time. Considering that the diameter of the sheath body 1 itself is small and the requirement for the structural dimension accuracy is high, generally, it is only necessary to provide the secondary channel 3 on the outer wall or the inner wall of the sheath body 1.

[0099] Furthermore, in this embodiment, the secondary channel 3 is formed by connecting at least one long thin sheet-shaped secondary channel component with the tube wall (inner wall or outer wall) of the sheath body 1. The secondary channel component is a long thin sheet channel component 35. The connection between the long thin sheet channel component 35 and the sheath body 1 forms a connecting portion 32. The remaining parts of the long thin sheet channel component 35 are not connected to the sheath body 1, forming a free portion 31. The size of the gap between the free portion 31 and the tube wall of the sheath body 1 varies according to the deformation state of the free portion 31. It should be noted that the deformation of the free portion 31 can be achieved through the elastic properties of the material of the long thin sheet channel component 35 itself. For example, the long thin sheet channel component 35 is made of a compliant material (such as PVC, latex, silicone) or a semi-compliant material. The elastic deformation of the long thin sheet channel component 35 is mainly reflected in the thinning of the wall thickness and the increase of the volume. The deformation of the free portion 31 can also be achieved by changing the position of the free portion 31. For example, the long thin-sheet channel component 35 is made of a non-compliant material (such as polyethylene (PE), polyurethane, nylon (Nylon, DuralynTM) and polyethylene terephthalate). At this time, the long thin-sheet channel component 35 has poor elasticity and fits closely with the tube wall of the sheath tube body 1, so that the free portion 31 can be closed. When fluid or instruments are introduced into the secondary channel 3, the free portion 31 can be expanded. When the free portion 31 is switched between the closed and expanded states, its wall thickness remains basically unchanged, but it is driven by external force to change its position and thus its shape. As can be seen from the above, the difference between non-compliant materials and compliant and semi-compliant materials is that the free portion 31 made of compliant and semi-compliant materials can automatically rebound to adhere to the wall of the sheath body 1 after the fluid or instrument is removed, achieving closure. In contrast, the free portion 31 made of non-compliant materials requires external force to return to adhere to the wall of the sheath body 1 after the fluid or instrument is removed, achieving closure. The so-called closure of the secondary channel 3 can be either complete or partial, and at least does not significantly affect the internal space of the primary channel 2 or excessively increase the outer diameter of the sheath body 1.

[0100] Generally, the long thin sheet channel member 35 extends along the axial direction of the sheath tube body 1. It can be parallel to the axial direction of the sheath tube body 1 or spirally wound around the axis of the sheath tube body 1 on the tube wall of the sheath tube body 1. As a preferred solution, the long thin sheet channel member 35 is arranged parallel to the axial direction of the sheath tube body 1. Correspondingly, the secondary channel 3 formed between the long thin sheet channel member 35 and the sheath tube body 1 is also arranged parallel to the axial direction of the sheath tube body 1. Both sides in the width direction of the long thin sheet channel member 35 are connected to the tube wall of the sheath tube body 1 to form a connection part 32. The whole connection part 32 extends along the axial direction of the sheath tube body 1. Generally, the number of secondary channels 3 formed between a long thin sheet channel member 35 and the sheath tube body 1 can be adjusted by changing the number of connection parts 32 formed by connecting the long thin sheet channel member 35 and the sheath tube body 1. A secondary channel 3 can be formed between every two adjacent connection parts 32. Generally, it is preferably that only one secondary channel 3 is formed between a long thin sheet channel member 35 and the sheath tube body 1. A channel entrance 33 is opened at a position of the secondary channel 3 close to the first axial end of the sheath tube body 1 (the end far from the affected part and close to the doctor during the surgical operation, also called the "proximal end"), and a channel exit 34 is opened at a position of the secondary channel 3 close to the second axial end of the sheath tube body 1 (the end located at the affected part and far from the doctor during the surgical operation, also called the "distal end"). According to the different positions of the long thin sheet channel member 35 on the inner and outer walls of the sheath tube body 1, the channel entrance 33 and the channel exit 34 can be opened on the free part 31 of the long thin sheet channel member 35 or on the tube wall at the corresponding position of the sheath tube body 1.

[0101] Furthermore, in this embodiment, one long thin sheet channel member 35 can be arranged on the sheath tube body 1 according to actual needs, and one corresponding secondary channel 3 is formed. Since the sheath tube body 1 is generally a circular tube, it is preferably that this one secondary channel 3 occupies 1 / 4 to 1 / 3 of the entire circumferential arc of the sheath tube body 1. Correspondingly, multiple long thin sheet channel members 35 can also be arranged along the circumferential direction of the sheath tube body 1 according to needs, and each long thin sheet channel member 35 forms one corresponding secondary channel 3. As a further preferred solution, when multiple secondary channels 3 are arranged on the sheath tube body 1, it is preferably that they are evenly distributed at intervals along the circumferential direction of the sheath tube body 1.

[0102] In this embodiment, the connection part 32 formed by connecting the long thin sheet channel member 35 and the tube wall of the sheath tube body 1 is preferably composed of one or a combination of a dot-shaped connection part 321, a sheet-shaped connection part 322, and a linear connection part 323. For example Figure 28 as shown, the connection part 32 is formed by a single long linear connection part 323 or formed by connecting multiple short linear connection parts 323 in series; as Figure 29 shown, the connection part 32 is formed by arranging a plurality of dot-shaped connection parts 321 along the axial direction of the sheath tube body 1; as Figure 30As shown, the connecting part 32 is formed by a single long sheet-like connecting part 322 or formed by connecting multiple short sheet-like connecting parts 322 in series. Compared with the linear connecting part 323, the sheet-like connecting part 322 has a larger width and a more reliable connection. In addition to the above arrangement forms, the connecting part 32 can also be formed by a combination of multiple of the dot-like connecting part 321, the sheet-like connecting part 322, and the linear connecting part 323. For example, half is provided with the dot-like connecting part 321 and the other half is provided with the linear connecting part 323; the dot-like connecting part 321, the sheet-like connecting part 322, and the linear connecting part 323 that make up the connecting part 32 can be arranged regularly or irregularly and randomly as needed, as long as they can seal the secondary channel 3. Whether it is the dot-like connecting part 321, the sheet-like connecting part 322, or the linear connecting part 323, they can all be directly connected to the sheath body 1 through processes such as bonding or welding by means of the long thin sheet channel component 35, or can also be connected and realized with the help of other connecting parts.

[0103] In the actual production process, the long thin sheet channel component 35 can also be integrally formed with the sheath body 1 directly, such as integrally extruded. The position where the long thin sheet channel component 35 and the sheath body 1 are closed is used as the connecting part 32, and the position where the long thin sheet channel component 35 is separated from the sheath body 1 is the clutch part 31 of the long thin sheet channel component 35.

[0104] In this embodiment, generally, both ends of the long thin sheet channel component 35 extend to the axial two ends of the sheath body 1 respectively and are not longer than the axial two ends of the sheath body 1. Correspondingly, the secondary channel 3 also extends to the axial two ends of the sheath body 1 and is not longer than the axial two ends of the sheath body 1. As Figures 9 to 11As shown in the figure, the long thin sheet channel component 35 is arranged on the inner wall of the sheath body 1. One end of the long thin sheet channel component 35 close to the proximal end of the sheath body 1 is hermetically connected to the inner wall of the sheath body 1. The channel inlet 33 of any secondary channel 3 is opened on the side wall of the proximal end of the sheath body 1 and is communicated with the inside of the secondary channel 3; One end of the long thin sheet channel component 35 close to the distal end of the sheath body 1 can be hermetically connected to the inner wall of the sheath body 1. At this time, the channel outlet 34 of any secondary channel 3 is opened on the side wall of the distal end of the sheath body 1, realizing the water outlet mode on the outer side of the distal end of the sheath. One end of the long thin sheet channel component 35 close to the distal end of the sheath body 1 can also be arranged in an open manner (that is, the long thin sheet channel component 35 is not hermetically connected to the inner wall of the sheath body 1). At this time, this opening can be used as the channel outlet 34 to directly drain the liquid, realizing the water outlet mode at the end of the distal end of the sheath; In order to improve the flushing, rotating suction and other effects brought by the liquid outlet at the distal end of the sheath, on the basis of keeping the end of the secondary channel 3 open, a channel outlet 34 can also be opened on the side wall of the distal end of the sheath body 1 at the same time, realizing the water outlet mode at the outer side and the end of the distal end of the sheath at the same time. According to the use requirements, a channel outlet 34 can also be opened on the free part of the long thin sheet channel component 35 close to the distal end of the sheath body 1 to realize the internal water outlet at the distal end of the sheath. This internal water outlet mode can be realized simultaneously with the above-mentioned end water outlet and outer side water outlet modes. When the channel outlet 34 is opened on the side wall of the distal end of the sheath body 1, the channel outlets 34 can be evenly distributed in both the axial and circumferential directions of the sheath body 1, or can be spirally distributed around the axial direction of the sheath body 1 to realize the swirling water outlet. Adding a channel outlet 34 on the side wall of the distal end of the sheath body 1 can make the distal end of the sheath body 1 softer and easier to bend and enter non-straight channels such as the renal pelvis through the UPJ.

[0105] When the long thin sheet channel component 35 is arranged on the inner wall of the sheath body 1, in addition to the above-mentioned setting form of the long thin sheet channel component 35, one end of the long thin sheet channel component 35 located at the distal end of the sheath body 1 can also be turned over and connected to the distal end of the sheath body 1 to form a turning part 38. The turning part 38 wraps the distal end of the sheath body 1 from both the inside and the outside, and the channel outlet 34 is opened on the turning part 38. Specifically, the channel outlet 34 is distributed at least at one of the first position, the second position and the third position of the turning part 38, where the first position is located on the part of the turning part 38 located on the outer wall of the sheath body 1, the second position is located on the part of the turning part 38 located on the inner wall of the sheath body 1, and the third position is located at the turning place of the turning part 38. As Figure 15 and Figure 16 shown in the figure, the channel outlet 34 is opened at the third position of the turning part 38, that is, the channel outlet 34 is located at the turning place of the turning part 38. At this time, the water outlet mode at the end of the distal end of the sheath can be realized. As Figure 17 and Figure 18As shown, the channel outlet 34 is simultaneously opened at the first position and the third position of the folding part 38, that is, the channel outlet 34 is located at the part of the folding part 38 on the outer wall of the sheath tube body 1 and the folding position of the folding part 38. At this time, the simultaneous water outlet mode of the outer side and the end of the distal end of the sheath tube can be realized. As Figure 19 and Figure 20 shown, the difference from the Figure 17 and Figure 18 shown solution is that the channel outlets 34 are spirally distributed on the part of the folding part 38 on the outer wall of the sheath tube body 1, which can further realize the swirling water outlet while realizing the simultaneous water outlet mode of the outer side and the end of the distal end of the sheath tube. It should be noted that when the long thin sheet channel component 35 is foldably connected to the distal end of the sheath tube body 1, the communication between the inside and the outside of the sheath tube body 1 is realized by opening a water passing hole on the tube wall of the sheath tube body 1, so as to Figure 17 take an example, the end of the long thin sheet channel component 35 and the inner wall of the distal end of the sheath tube body 1 are first closed to form an internal closed part, then folded outward, and finally the edge position of the end of the long thin sheet channel component 35 and the outer wall of the distal end of the sheath tube body 1 are closed to form an external closed part. As Figure 17 shown, there is a height difference between the external closed part and the internal closed part, and the internal closed part is located above the external closed part. A water passing hole is opened on the side wall of the sheath tube body 1 between the internal closed part and the external closed part to drain the liquid in the secondary channel 3 inside the sheath tube body 1 into the gap between the outside of the distal end of the sheath tube body 1 and the folding part 38. Then the liquid is discharged through the folding position of the folding part 38 or the channel outlet 34 outside.

[0106] In this embodiment, when the long thin sheet channel component 35 is arranged on the outer wall of the sheath tube body 1, it is basically the same as the form when the long thin sheet channel component 35 is arranged on the inner wall of the sheath tube body 1 (including the form of forming the folding part and the form that the long thin sheet channel component 35 only extends to the end of the sheath tube body 1 but does not form the folding part). The difference is only that the long thin sheet channel component 35 is located outside the sheath tube body 1, and the opening position of the channel outlet 34 will change adaptively (the channel outlet 34 will mostly be directly opened on the free part of the long thin sheet channel component 35). The rest are the same as when the long thin sheet channel component 35 is arranged on the inner wall of the sheath tube body 1, and will not be elaborated here.

[0107] In addition, it should be noted that the long thin sheet channel component 35 is a layer of complete material connected to the tube wall of the sheath tube body 1, so there will be no leakage. The cross-section of the formed secondary channel 3 can be any shape such as circular or elliptical when in the expanded state.

[0108] In this embodiment, a temperature sensor and / or a pressure sensor can also be arranged on the sheath tube body 1 as needed. As Figure 14 shown, a sensor installation hole 11 is opened in the tube wall of the sheath tube body 1 for installing a temperature sensor and / or a pressure sensor, etc.

[0109] In this embodiment, the sheath tube body 1 can be set as a detachable sheath (also known as a tearable sheath). A hydrophilic coating can also be attached to the inner wall surface and / or the outer wall surface of the sheath tube body 1.

[0110] In this embodiment, the aforementioned medical sheath tube can be applied in natural cavities including blood vessels, airways, lacrimal ducts, ear canals, digestive tracts, etc. or in the third space of a living body as needed, that is, the above-mentioned medical sheath tube can be used as a blood vessel sheath tube, an airway sheath tube, a lacrimal duct sheath tube, an ear canal sheath tube, a digestive tract sheath tube or a ureter sheath tube to achieve different clinical usage forms.

[0111] During the use of the aforementioned medical sheath tube, when the medical device in the main channel 2 is completely withdrawn or withdrawn to the proximal position of the main channel 2, fluid can be injected into the secondary channel 3 from outside the body and flow out through the channel outlet 34 of the secondary channel 3, playing corresponding medical roles such as flushing, antibacterial, anticoagulant and other drug delivery; a tubular medical tool can also be inserted through the secondary channel 3, playing corresponding medical roles such as suction, flushing, drug delivery, image acquisition, tissue ablation, etc. Taking the aforementioned medical sheath tube used as a ureter sheath tube for urological surgery as an example below, its usage principle and usage effect will be specifically described.

[0112] In the medical sheath tube, since the free part 31 in each secondary channel 3 is a closable structure, a dynamic gap is formed between the free part 31 and the inner wall of the sheath tube body 1 (which can be opened according to requirements and can also be closed according to requirements). When the endoscope (generally a flexible endoscope) works in the main channel 2 of the sheath tube body 1, when no liquid is injected into the secondary channel 3, its free part 31 clings to the inner wall of the sheath tube body 1 and is in a wall-attached state, hardly occupying the internal space of the main channel 2; when the lithotripsy reaches a certain degree, the endoscope retreats to the proximal end of the main channel 2, leaving enough space to suck the lithotripsy. At the same time, liquid is perfused into the secondary channel 3 through the channel inlet 33, so that the free part 31 of the secondary channel 3 is expanded by the water pressure and is in an expanded and free state for fluid perfusion. During the perfusion process, combined with the deformation characteristics of the free part 31, by controlling the size of the fluid flow rate, the expansion degree of the free part 31 can be controlled, and then the size of the space in the main channel 2 can be controlled to meet the requirement of balancing the intraoperative perfusion volume and the fluid discharge volume. Through the above solution, the ureter sheath tube can not only discharge larger-sized lithotripsy but also realize the function of continuous perfusion, enabling intraoperative fluid perfusion and fluid discharge to be carried out simultaneously; at the same time, since the secondary channel 3 adopts a closable design, it can remain closed when no fluid is filled, thus overcoming the problem that the existing perfusion channel is formed on the inner wall of the sheath, with a fixed volume, and its volume will not shrink even when no fluid is filled, occupying the space inside the sheath and thus affecting the operation of the flexible endoscope.

[0113] In addition, in most cases, the secondary channel 3 is initially in a closed state, with no gas retained inside the channel. During perfusion, no gas will be introduced into the renal pelvis, and the physiological function of the renal pelvis will not be damaged. At the same time, the entry of additional air into the body is not conducive to heat dissipation during the laser treatment process. Instead, bacteria are more likely to survive and reproduce at the gas / liquid interface, making infection more likely to occur. The closable design of the secondary channel 3 in this solution can effectively avoid this risk.

[0114] Embodiment 2

[0115] This embodiment provides a medical sheath tube, which is different from that in Embodiment 1 only in that the secondary channel component adopted is a long thin-walled tubular different from the long thin-sheet channel component 35. That is, the secondary channel 3 is formed by the inner or outer sleeving of the long thin-walled tubular channel component 36 and the sheath tube body 1. The connection part 32 is formed at the connection of the tube walls of the long thin-walled tubular channel component 36 and the sheath tube body 1, and the remaining part of the long thin-walled tubular channel component 36 constitutes the free part 31. The setting form of the long thin-sheet channel component 35 can change the setting quantity and distribution form of the secondary channel 3 on the sheath tube body 1 by changing the number and setting position of the long thin-sheet channel components 35, and it can be realized that only a part of the sheath tube body 1 is provided with the secondary channel 3. Different from the long thin-sheet channel component 35, the whole of the long thin-walled tubular channel component 36 is sleeved with the sheath tube body 1. It can be sleeved outside the sheath tube body 1 or inside the sheath tube body 1. The annular gap between the long thin-walled tubular channel component 36 and the sheath tube body 1 can be used as the secondary channel 3 as a whole, or the whole annular gap can be divided into multiple independent secondary channels 3 by locally connecting the long thin-walled tubular channel component 36 to the tube wall of the sheath tube body 1 to form the connection part 32. The formed multiple secondary channels 3 are preferably arranged parallel to the axial direction of the sheath tube body 1.

[0116] The setting form of the connection part 32 between the long thin-walled tubular channel component 36 and the sheath tube body 1, the setting form of the channel outlet 34, the setting form of the channel inlet 33, etc. are all similar to those in Embodiment 1. For specific reference, please refer to Embodiment 1 and will not be elaborated here.

[0117] In this embodiment, the long thin-walled tubular channel component 36 can also be integrally formed with the sheath tube body 1, such as co-extrusion molding. The application field and actual application effect of the medical sheath tube are the same as those in Embodiment 1 and will not be elaborated here.

[0118] Embodiment 3

[0119] This embodiment provides a medical sheath tube, which is only different from that of the first embodiment in that the secondary channel component adopts a thin-walled fire hose strip different from the long thin sheet channel component 35, that is, the secondary channel 3 is formed by connecting at least one thin-walled fire hose strip channel component 37 to the tube wall of the sheath tube body 1. The thin-walled fire hose strip channel component 37 is a soft tube structure, which can be expanded when a fluid or an instrument is introduced, and is in a flattened and closed state after the fluid or the instrument is discharged. In this solution, a connection part 32 is formed at the connection between the thin-walled fire hose strip channel component 37 and the sheath tube body 1, and the tube wall of the thin-walled fire hose strip channel component 37 constitutes a free part 31. Exactly speaking, the internal pipe of the thin-walled fire hose strip channel component 37 is the secondary channel 3. Similar to the long thin sheet channel component 35, the thin-walled fire hose strip channel component 37 can be evenly distributed in the circumferential direction of the sheath tube body 1, or can be arranged only in a part of the sheath tube body 1.

[0120] In this embodiment, the setting form of the connection part 32 between the thin-walled fire hose strip channel component 37 and the sheath tube body 1, the setting form of the channel outlet 34, the setting form of the channel inlet 33, etc. are all similar to those of the first embodiment. For specific reference, please refer to the first embodiment and will not be elaborated here.

[0121] In this embodiment, the thin-walled fire hose strip channel component 37 can also be integrally formed with the sheath tube body 1, such as co-extrusion molding. The application field and actual application effect of the medical sheath tube are the same as those of the first embodiment and will not be elaborated here.

[0122] Embodiment 4

[0123] This embodiment provides a medical sheath, which differs from the first embodiment only in that the secondary channel 3 comprises a thin-walled protrusion co-extruded with the sheath body 1, i.e., the secondary channel 3 is integrally formed with the sheath body 1. The extruded thin-walled protrusion serves as a free portion 31, which protrudes into or out of the lumen of the sheath body 1. When in the initial state, the thin-walled protrusion probes into the cavity of the sheath tube main body 1 and makes the secondary channel 3 open, the thin-walled protrusion can be deformed by the pressure of the medical device or fluid entering the main channel 2, so that the thin-walled protrusion sticks to the inner wall of the main channel 2 connected to it, and the secondary channel 3 is in a closed state, which will not encroach on the internal space of the main channel 2 and will not affect the entry and exit of medical devices or fluids in the main channel 2; when in the initial state, the thin-walled protrusion probes out of the cavity of the sheath tube main body 1 and makes the secondary channel 3 open, when the sheath tube main body 1 enters the natural cavity of the human body during use, the outward thin-walled protrusion is compressed by the inner surface of the natural cavity and deformed, so that the thin-walled protrusion sticks to the outer wall of the sheath tube main body 1 connected to it, and the secondary channel 3 is closed, which will not expand the outer diameter of the sheath tube main body 1. The aforementioned secondary channel 3 is in a closed state, which does not mean that the channel inlet 33 and the channel outlet 34 of the secondary channel 3 are closed to the outside, but means that the internal space of the secondary channel 3 disappears, thereby not occupying the internal space of the main channel 2 or expanding the outer diameter of the sheath body 1.

[0124] The secondary channels 3 are arranged in the same manner as the long sheet channel component 35 , and can be evenly distributed around the sheath tube body 1 , or can be arranged only in a part of the sheath tube body 1 .

[0125] In this embodiment, the arrangement of the channel outlet 34 and the channel inlet 33 on the secondary channel 3 are similar to those in the first embodiment. Please refer to the first embodiment for details and will not be repeated here.

[0126] In this embodiment, the application field and actual application effect of the medical sheath are the same as those in the first embodiment, and the details are not repeated here.

[0127] Example 5

[0128] This embodiment is based on the medical sheath disclosed in any one of the embodiments 1 to 4, and the end of the sheath body 1 that is used to extend into the human body cavity, that is, the distal end, is set as a bendable section 12. The bendable section 12 can be passively bent under external pressure such as the physiological cavity, or can be actively bent by actively manipulating a knob or slider. And because a medical sheath generally has multiple secondary channels 3 evenly distributed in the circumferential direction of the sheath body 1, even if the bendable section 12 at the distal end of the sheath body 1 bends, causing the secondary channels 3 at the bending point to be squeezed, some of the secondary channels 3 on the side of the sheath body 1 away from the bending direction still maintain normal function, thereby ensuring the normal circulation of the perfusion fluid.

[0129] The distal end of the medical sheath tube adopts a bendable design solution, which overcomes the problem that the traditional ureteral guiding sheath cannot be bent and causes ureteral injury. At the same time, it can avoid the problem of unsmooth intraoperative irrigation fluid drainage caused by improper placement of the sheath, and can improve the efficiency and safety of ureteral surgery.

[0130] Example 6

[0131] In this embodiment, a ureteral guiding sheath 200 is proposed, which includes a connector 4 and a medical sheath tube disclosed in any one of Embodiments 1 to 4. A guiding channel 41 is provided on the connector 4. One end of the guiding channel 41 is sleeved on the axial end (i.e., the proximal end) of the sheath tube body 1 through a tube connection structure 42. A buffer cavity 421 for sealingly docking with the channel inlet 33 is provided on the tube connection structure 42; a perfusion port 43 communicating with the buffer cavity 421 and a fluid discharge port 44 communicating with the main channel 2 are further provided on the connector 4. A pressure regulating structure 45 is further provided on the fluid discharge port 44. The fluid discharge port 44 is generally connected to a negative pressure device for use, and the pressure regulating structure 45 can adjust the magnitude of the negative pressure suction. The pressure regulating structure 45 adopts an existing pressure regulating structure, such as a negative pressure valve, etc., which will not be elaborated herein.

[0132] In this embodiment, the buffer cavity 421 can play a role in fluid buffering. The buffer cavities 421 can be arranged in one-to-one correspondence with the secondary channels 3, and all the buffer cavities 421 are isolated from each other. Any one of the buffer cavities 421 is correspondingly communicated with a perfusion port 43. In addition to this form, the buffer cavity 421 can also be set as a continuous annular cavity arranged along the circumferential direction of the sheath tube body 1, and the channel inlet 33 of any one of the secondary channels 3 is communicated with the buffer cavity 421. Only one perfusion port 43 is provided on the connector 4 and communicated with the buffer cavity 421. This solution preferably uses the buffer cavity 421 as a continuous annular cavity. By perfusing fluid into a single perfusion port 43, all the secondary channels 3 can be perfused simultaneously, which is beneficial to improving the surgical efficiency and surgical effect.

[0133] In this embodiment, the aforementioned guiding channel 41 is the main channel of the connector 4, and the perfusion port 43 and the fluid discharge port 44 are both branch channels provided on the guiding channel 41. Surgical instruments and the like used during the operation generally enter the main channel 2 of the medical sheath tube through the guiding channel 41. In the non-use state, the end of the guiding channel 41 facing away from the tube connection structure 42 is sealed with a sealing cap 46, which has a dust-proof effect.

[0134] When using the aforementioned ureteral guide sheath 200 for urological surgery, the sheath body 1 is first inserted into the renal pelvis 7. The endoscope or accessory used in conjunction with the sheath enters the target location of the renal pelvis 7 through the main channel 2. The infusion port 43 is connected to an external perfusion fluid (the perfusion fluid can be injected into the infusion port 43 via an infusion device, artificially, or naturally due to gravity). The fluid discharge port 44 can be connected to an external negative pressure device. The pressure regulating structure 45 can adjust the pressure within the renal pelvis as needed. When the lithotripsy reaches a certain level, the endoscope is withdrawn to the proximal end of the main channel 2, leaving sufficient space for attracting the lithotripsy. Liquid can then be injected into the channel inlet 33 through the infusion port 43, causing the free portion 31 of the secondary channel 3 to expand under the water pressure, resulting in a stretched and free state, thereby meeting the intraoperative requirement for balanced infusion and return flow. Simultaneously, the liquid drives the lithotripsy out of the body through the main channel 2 and the fluid discharge port 44. Since the space within the main channel 2 is unoccupied, the return flow of fluid within the sheath is guaranteed.

[0135] Example 7

[0136] Based on Example 6, in the ureteral guide sheath 200 proposed in this embodiment, the end of the sheath body 1 that is used to extend into the human body cavity, i.e., the distal end, is provided as a bendable section 12. This bendable section 12 can bend passively under external pressure such as the physiological cavity, or can be actively bent by actively manipulating the bending adjustment mechanism 5. Furthermore, because medical sheaths generally have multiple secondary channels 3 evenly distributed in the circumferential direction of the sheath body 1, even if the bendable section 12 at the distal end of the sheath body 1 bends, some of the secondary channels 3 on the side of the sheath body 1 that is away from the bending direction still maintain normal function, thereby ensuring the normal circulation of the perfusion fluid.

[0137] In this embodiment, the bending adjustment mechanism 5 can be arranged independently of the connector 4 or directly provided on the connector 4. To improve the integration, compactness, and portability of the ureteral guiding sheath 200, it is preferred that the bending adjustment mechanism 5 is provided on the connector 4 and located on the tube wall of the guiding channel 41. The bending adjustment mechanism 5 includes a traction rope 51 and a traction rope traction mechanism. The traction rope 51 is disposed through the sheath tube body 1 and is arranged attached to the inner wall of the sheath tube body 1, and it does not affect the passage of fluids or instruments in the main channel 2. The traction rope 51 is preferably a soft metal wire, such as iron wire, copper wire, etc. One end of the traction rope 51 is connected to the bendable section 12, and the other end is connected to the traction rope traction mechanism. The traction rope traction mechanism can control the bending degree of the bendable section 12 by pushing and pulling the traction rope 51 (it can control the bendable section 12 to be curled into an arc with a central angle of 180° - 270°, or can also control the bendable section 12 to return to a straight state). The traction rope traction mechanism can be a slider slidably connected to the tube wall of the guiding channel 41. The slider can slide along the axial direction of the guiding channel 41 to linearly push and pull the traction rope 51; the traction rope traction mechanism can also be a knob rotatably connected to the tube wall of the guiding channel 41. By rotating the knob, the traction rope 51 can be wound and unwound on the knob rotating shaft, thereby achieving the effect of pulling the bendable section 12. In actual operation, the bending direction and bending degree of the bendable section 12 can be controlled by adjusting the number of the traction ropes 51 or the connection position between the traction rope 51 and the bendable section 12.

[0138] The distal end of the medical sheath tube adopts a bendable design solution, which overcomes the problem that the traditional ureteral guiding sheath cannot be bent and causes ureteral injury. At the same time, it can avoid the problem of unsmooth intraoperative irrigation fluid drainage caused by improper placement of the sheath, and can improve the efficiency and safety of ureteral surgery.

[0139] Embodiment 8

[0140] This embodiment provides a ureteral surgical system 100, which includes the ureteral guiding sheath 200 disclosed in Embodiment 7. In addition, it further includes at least one of a perfusion device (for supplying perfusion fluid), an endoscope, a lithotripsy optical fiber, a long conical inner core 6, a negative pressure suction device, and a guide wire 8. Among them, the long conical inner core 6 is generally sleeved in the main channel 2 of the medical sheath tube, and a hydrophilic coating is generally attached to the front end (distal end) of the long conical inner core 6.

[0141] Taking the ureteral surgical system 100 as an example that simultaneously includes the ureteral guiding sheath 200, an endoscope (generally a flexible ureteroscope), a lithotripsy optical fiber, a long conical inner core 6, a negative pressure suction device, and a guide wire 8 disclosed in Embodiment 7, the usage method will be specifically described as follows. When the ureteral surgical system 100 is in use, the steps are as follows:

[0142] Step 1, as Figure 31 shown, use relevant medical devices to insert the guide wire 8 into the renal pelvis 7;

[0143] Step 2: As Figure 32 shown, insert the guide wire 8 into the central hole of the guide sheath dilator, and insert the entire ureteral guide sheath 200 along the guide wire 8 into the renal pelvis 7 and reach the target position;

[0144] Step 3: As Figure 33 shown, withdraw the dilator, connect the negative pressure suction device to the fluid discharge port 44, and connect the perfusion device to the perfusion port 43;

[0145] Step 4: Turn on the negative pressure suction device and the perfusion device;

[0146] Step 5: Insert the endoscope and other auxiliary instruments into the main channel 2, and push the distal end of the sheath body 1 in the ureteral guide sheath 200 to reach the stone under the visual state of the endoscope; As Figure 34 shown, during the process of the distal end of the sheath body 1 reaching the stone, the bendable section 12 bends, and this bending process can be assisted by the bending adjustment mechanism 5;

[0147] Step 6: As Figure 35 shown, the lithotripsy optical fiber enters the renal pelvis 7 along the working channel of the endoscope, pulverizes the target stone, and the fine crushed stones are discharged out of the body through the mirror sheath gap and the fluid discharge port 44 in sequence under the suction of negative pressure;

[0148] Step 7: As Figure 36 shown, when there are crushed stones that cannot be discharged from the mirror sheath gap, the endoscope can be withdrawn to the end position of the connector 4 but not completely withdrawn, so that the tip of the endoscope vacates the communication port between the fluid discharge port 44 and the connector 4 to avoid affecting the discharge of the crushed stones from the fluid discharge port 44;

[0149] Step 8: After the crushed stones are discharged, completely withdraw the endoscope from the guide sheath. The bending degree and bending direction of the bendable section 12 can be assisted by the bending adjustment mechanism 5 to achieve the safe withdrawal of the sheath body 1 in the ureteral guide sheath 200 from the renal pelvis 7.

[0150] It can be seen that the ureteral surgical system 100 in this embodiment can perform perfusion and suction simultaneously during the operation, greatly improving the operation efficiency and shortening the operation time.

[0151] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0152] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A medical sheath tube, comprising a sheath tube body (1), characterized in that, The sheath tube body (1) has: A main channel (2) opened inside the sheath tube body (1) for allowing fluids or surgical instruments to pass through; A secondary channel (3), including a deformable free portion (31) and a connecting portion (32) in contact with the sheath tube body (1). The secondary channel (3) has a channel inlet (33) and a channel outlet (34). When the initial state of the secondary channel (3) is a closed state, filling with fluids or surgical instruments can deform the free portion (31) to expand the secondary channel (3) to an open state. When the initial state of the secondary channel (3) is an open state, being externally pressured can deform the free portion (31) to squeeze the secondary channel (3) to a closed state, and in the closed state, the free portion (31) fits against the tube wall of the sheath tube body (1). Wherein: The secondary channel (3) is formed by connecting at least one thin-wall fire hose-shaped secondary channel component to the tube wall of the sheath tube body (1). The connection between the secondary channel component and the sheath tube body (1) forms the connecting portion (32), and the tube wall of the secondary channel component constitutes the free portion (31). The channel inlet (33) is opened at a position of the secondary channel (3) near the first axial end of the sheath tube body (1), and the channel outlet (34) is opened at a position of the secondary channel (3) near the second axial end of the sheath tube body (1); The deformation of the free portion (31) can be achieved through the elastic properties of its own material or by changing the position of the free portion (31); The secondary channel (3) spans 1 / 4 to 1 / 3 of the entire circumferential arc of the sheath tube body (1); The secondary channel component is folded at the second axial end of the sheath tube body (1) to form a folded portion (38). The folded portion (38) wraps the second axial end of the sheath tube body (1) from both the inside and outside, and the channel outlet (34) is opened at the folded portion (38). The channel outlet (34) is distributed at least at one of a first position, a second position, and a third position on the folded portion (38). Wherein, the first position is on the part of the folded portion (38) located on the outer wall of the sheath tube body (1), the second position is on the part of the folded portion (38) located on the inner wall of the sheath tube body (1), and the third position is at the folding point of the folded portion (38).

2. The medical sheath tube according to claim 1, wherein The secondary channel (3) is composed of a thin-wall protruding portion co-extruded with the sheath tube body (1). The thin-wall protruding portion serves as the free portion (31) and protrudes into or out of the cavity of the sheath tube body (1).

3. The medical sheath tube according to claim 1, characterized in that, The secondary channel component is integrally formed with the sheath tube body (1).

4. The medical sheath tube according to claim 1 or 2, characterized in that, Both ends of the secondary channel component extend to the two axial ends of the sheath tube body (1) respectively and are not longer than the two axial ends of the sheath tube body (1).

5. The medical sheath tube according to claim 1, wherein The connecting portion (32) is composed of one or a combination of a dot-shaped connecting portion (321), a sheet-shaped connecting portion (322), and a linear connecting portion (323).

6. The medical sheath tube according to claim 1 or 2, characterized in that, The sheath tube body (1) is also provided with a temperature sensor and / or a pressure sensor.

7. The medical sheath tube according to claim 1 or 2, characterized in that, The sheath tube body (1) is provided with one secondary channel (3); or, the sheath tube body (1) is provided with a plurality of secondary channels (3) along its circumference.

8. The medical sheath tube according to claim 7, wherein One end of the sheath tube body (1) for extending into a human body cavity is provided as a bendable section (12).

9. The medical sheath tube according to claim 1 or 2, characterized in that, The medical sheath is a vascular sheath, an airway sheath, a lacrimal duct sheath, an ear canal sheath, a digestive tract sheath or a ureteral sheath.

10. A ureteral guiding sheath, characterized in that, The medical sheath comprises a connector (4) and the medical sheath according to any one of claims 1 to 9, wherein the connector (4) is provided with a guide channel (41), one end of the guide channel (41) is sleeved on an axial end of the sheath body (1) through a tube connection structure (42), and the tube connection structure (42) is provided with a buffer cavity (421) sealedly connected to the channel inlet (33); The joint (4) is also provided with a filling port (43) communicating with the buffer chamber (421) and a fluid discharge port (44) communicating with the main channel (2).

11. The ureteral guiding sheath according to claim 10, wherein, The buffer chambers (421) are arranged in a one-to-one correspondence with the secondary channels (3), and all the buffer chambers (421) are isolated from each other, and any buffer chamber (421) is correspondingly connected to one of the infusion ports (43); Alternatively, the buffer cavity (421) is a continuous annular cavity arranged along the circumference of the sheath tube body (1), and the channel inlet (33) of any one of the secondary channels (3) is connected to the buffer cavity (421).

12. The ureteral guiding sheath according to claim 10 or 11, characterized in that, One end of the sheath body (1) facing away from the tube connection structure (42) is provided as a bendable section (12), and the ureteral guide sheath further comprises a bending adjustment mechanism (5) for controlling the degree of bending of the bendable section (12).

13. A ureteral surgical system, characterized in that, The ureteral guide sheath comprises the ureteral guide sheath as described in any one of claims 10 to 12, and further comprises at least one of an irrigation device, an endoscope, a lithotripsy optical fiber, a long tapered inner core (6), a negative pressure suction device and a guide wire (8).

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