Ureter guiding sheath and ureter pyeloscope system

Abstract

The utility model relates to a ureter guiding sheath and a ureter pyeloscope system, the guiding sheath comprises a sheath tube, the sheath tube comprises a first section and a second section along the axial direction, the first section comprises a first inner cavity along the axial direction, and the second section comprises a second inner cavity and a third inner cavity along the axial direction; the first inner cavity is communicated with the second inner cavity and the third inner cavity, and the second inner cavity and the third inner cavity are isolated from each other. By arranging the second inner cavity and the third inner cavity which are independent, on the basis that the size of the sheathing canal does not need to be changed, detection equipment or surgical equipment can be separated from the tissue diversion channel, so that detection operation or surgical operation and outflow of tissues do not influence each other, discharged substances can be effectively discharged through the third inner cavity, and the detection efficiency is improved. The discharging efficiency is improved, and retention and accumulation of the substances in the inner cavity are avoided; and on the other hand, the smoothness of repeated operation of each device in the second inner cavity is ensured, the operation efficiency is improved, and the adverse effect on the patient in the operation caused by the prolonged operation time is avoided.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a ureteral guide sheath and a ureteropelvic endoscope system comprising the ureteral guide sheath. Background Art

[0002] Ureteral guide sheaths are used for urological endoscopic examinations and surgeries. They can establish a channel for endoscopes and other surgical instruments or detection equipment to enter the urinary system during urological surgery, thereby protecting the endoscope and other surgical instruments or detection equipment, as well as the ureter when assisting the endoscope, detection equipment or surgical instruments to enter the urinary tract. At the same time, the ureteral guide sheath can also provide a channel for the removal of liquids, blood, tissues, gravel and other substances in the urinary cavity during surgery, making it easier to discharge them out of the body through the guide sheath, thereby improving the effectiveness and safety of examinations and treatments, and significantly reducing ureteral injuries.

[0003] In current urinary system examinations or surgeries, detection equipment or surgical equipment is usually introduced into the urinary system through the lumen of the ureteral guide sheath along the inner cavity of the guide sheath. For example, in lithotripsy, an endoscope is inserted into the body through the inner cavity of the guide sheath, and a holmium laser fiber or other lithotripsy device is inserted through the working channel of the endoscope. The laser or lithotripsy device is fired to break up the stones; the stone fragments are sucked out of the body through the inner cavity together with other tissues by negative pressure. In the above-mentioned surgical process, when the stone fragments are discharged from the body through the inner cavity of the guide sheath, they are easy to interfere with the soft endoscope working in the guide sheath, which affects the effective discharge of the stone fragments on the one hand, and affects the repeated entry and exit operation of the soft endoscope in the guide sheath on the other hand, resulting in reduced surgical efficiency and prolonged surgical time, which has an adverse effect on the patient during the operation. Utility Model Content

[0004] The utility model provides a ureteral guide sheath and a ureteropelvic mirror system comprising the ureteral guide sheath, so as to solve the problem of interference between tissue derivation and detection or surgical equipment in the ureteral guide sheath.

[0005] The utility model provides a ureteral guide sheath, comprising a sheath tube, wherein the sheath tube comprises a first section and a second section along the axial direction, the first section comprises a first inner cavity along the axial direction, and the second section comprises a second inner cavity and a third inner cavity along the axial direction; the first inner cavity is respectively connected with the second inner cavity and the third inner cavity, and the second inner cavity and the third inner cavity are isolated from each other.

[0006] Specifically, the second section also includes a fourth inner cavity along the axial direction, the first inner cavity is connected to the fourth inner cavity, and the fourth inner cavity is isolated from the second inner cavity and the third inner cavity.

[0007] Specifically, the second section further includes a fourth inner cavity and a fifth inner cavity along the axial direction. The first inner cavity is in communication with both the fourth inner cavity and the fifth inner cavity, and the fourth inner cavity and the fifth inner cavity are respectively isolated from the second inner cavity and the third inner cavity; in a cross-section perpendicular to the axial direction, the fourth inner cavity and the fifth inner cavity are symmetrically distributed relative to the second inner cavity.

[0008] Specifically, the sheath tube includes a second inner tube and a third inner tube embedded in the second section along the axial direction. The second inner tube forms the second inner cavity, and the third inner tube forms the third inner cavity.

[0009] Specifically, in a cross-section perpendicular to the axial direction, the cross-sectional area of the second inner cavity is smaller than that of the third inner cavity.

[0010] Specifically, the axial length of the first section is 140 mm to 400 mm, and the maximum outer diameter of the first section does not exceed 6 mm.

[0011] Specifically, the maximum outer diameter of the first section is smaller than the minimum outer diameter of the second section.

[0012] Specifically, the guiding sheath further includes a negative pressure mechanism, and the negative pressure mechanism includes a negative pressure regulating valve and a negative pressure pump; the negative pressure regulating valve is in communication with the second inner cavity, and the negative pressure pump is in communication with the third inner cavity.

[0013] Specifically, the guiding sheath further includes a sheath tube seat sleeved on the end of the second section, and the sheath tube seat includes a guiding tube; the negative pressure regulating valve is arranged on the sheath tube seat, and the communication between the second inner cavity and the atmosphere is controlled through the negative pressure regulating valve; the guiding tube is connected to the third inner cavity, and the negative pressure pump is in communication with the third inner cavity through the guiding tube.

[0014] The present utility model also provides a ureteropyeloscope system, including the ureter guiding sheath according to any one of the above.

[0015] The above technical solutions provided by the embodiments of the present utility model have the following advantages compared with the prior art: The ureter guiding sheath is provided with two independent inner cavities in the second section: the second inner cavity and the third inner cavity. Without changing the size of the sheath tube, the detection device or the surgical device can be separated from the tissue drainage channel, so that the detection operation or the surgical operation and the outflow of the tissue do not affect each other. Thus, on the one hand, substances such as liquid, blood, tissue, and broken stones can be effectively discharged through the third inner cavity, improving the discharge efficiency and avoiding the retention and accumulation of the above substances in the inner cavity; on the other hand, the smoothness of the repeated operation of each device in the second inner cavity is ensured, improving the surgical efficiency and avoiding the adverse effects on the intraoperative patient caused by the extension of the surgical time. Description of the Drawings

[0016] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present utility model and used together with the specification to explain the principles of the present utility model.

[0017] 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 for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Structural schematic diagram of the sheath tube of a ureteral guiding sheath provided by the first embodiment of the present invention;

[0019] Figure 2 is Figure 1 Cross-sectional view of the second section of the sheath tube in [reference] along arrow B;

[0020] Figure 3 Structural schematic diagram of a ureteral guiding sheath provided by the second embodiment of the present invention;

[0021] Figure 4 Structural schematic diagram of a ureteral guiding sheath provided by the third embodiment of the present invention;

[0022] Figure 5 is Figure 4 Cross-sectional view of the second section of the sheath tube in [reference];

[0023] Figures 6 to 10 Cross-sectional view of the second section of the sheath tube under each implementation mode in the fourth embodiment of the present invention. Specific implementation mode

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that in the field of interventional medical devices, the proximal end refers to the end closer to the operator, while the distal end refers to the end farther from the operator; the axial direction refers to the direction parallel to the line connecting the centers of the distal end and the proximal end of the medical device. The above definitions are only for convenience of description and should not be construed as a limitation to the present invention.

[0026] Figure 1 and Figure 2A ureteral guiding sheath (hereinafter simply referred to as the guiding sheath) provided for the first embodiment of the present utility model includes a sheath tube 10. The sheath tube 10 includes a first section 11 and a second section 12 along the axial direction A. The first section 11 includes a first inner cavity 111 along the axial direction A, and the second section 12 includes a second inner cavity 121 and a third inner cavity 122 along the axial direction A. The first inner cavity 111 is respectively communicated with the second inner cavity 121 and the third inner cavity 122, and the second inner cavity 121 and the third inner cavity 122 are isolated from each other.

[0027] The above-mentioned second inner cavity 121 can be used as a functional cavity for accommodating detection equipment or surgical equipment. The detection equipment can be a pressure measuring device, a temperature measuring device, etc., and the surgical equipment can be an endoscope, etc. which are not listed one by one here. Those of ordinary skill in the art can select a suitable detection equipment or surgical equipment to penetrate into the second inner cavity 121 according to the usage scenario and needs, and enter the urinary system through the second inner cavity 121. The third inner cavity 122 is used as a diversion channel, and substances such as liquids, bloodstains, tissues, and crushed stones generated during detection or surgery can be discharged out of the body through the third inner cavity 122. The above-mentioned first inner cavity 111 being respectively communicated with the second inner cavity 121 and the third inner cavity 122 means that the distal opening of the second inner cavity 121 is communicated with the first inner cavity 111, and the distal opening of the third inner cavity 122 is communicated with the first inner cavity 111. The above-mentioned second inner cavity 121 and the third inner cavity 122 being isolated from each other means that except for being communicated with the first inner cavity 111 at the opening of the first inner cavity 111, the second inner cavity 121 and the third inner cavity 122 are not communicated with each other in other parts.

[0028] In the ureteral guiding sheath of this embodiment, two independent inner cavities, namely the second inner cavity 121 and the third inner cavity 122, are provided in the second section 12. Without changing the size of the sheath tube 10, the detection equipment or surgical equipment can be separated from the tissue diversion channel, so that the detection operation or surgical operation and the outflow of tissues do not affect each other. Thus, on the one hand, substances such as liquids, bloodstains, tissues, and crushed stones can be effectively discharged through the third inner cavity 122, improving the discharge efficiency and avoiding the retention and accumulation of the above substances in the inner cavity. On the other hand, the smoothness of repeated operations of each device in the second inner cavity 121 is ensured, improving the surgical efficiency and avoiding adverse effects on the patient during the operation due to the prolongation of the operation time.

[0029] In the specific implementation of this embodiment, the axial length of the first section 11 can be set to 140 mm to 400 mm, and the maximum outer diameter of the first section 11 does not exceed 6 mm. In human anatomical structures, the upper urinary tract includes the ureter and the kidney, and the outer diameter of the adult ureter is usually 3 mm to 6 mm. The lower urinary tract includes the urethra and the bladder, and the outer diameter of the adult urethra is usually 7 mm to 15 mm. Therefore, during the operation, the first section 11 is suitable for extending into the ureter of the upper urinary tract, and the second section 12 can be placed in the lower urinary tract, such as the urethra. The above size ranges are all set according to human anatomical structures. However, for specific populations, such as women, men, or children, multiple specifications can be set. For example, for women, considering that the length of their ureter is about 260 mm, the axial length of the first section 11 can be set to 255 mm, 260 mm, or 265 mm, etc.; for men, considering that the length of their ureter is about 280 mm, the axial length of the first section 11 can be set to 275 mm, 280 mm, or 285 mm, etc.; for children, the axial length of the first section 11 can be considered to be set to 150 mm, 170 mm, or 200 mm, etc., and they will not be listed one by one here. It should be known that the setting of the axial length and the diameter length of the first section 11 is only for example and is not a limitation to the present utility model. Other sizes set according to the teachings of the utility model are within the protection scope of the present utility model.

[0030] In existing detection or surgical operations, taking endoscopic operation as an example, every time the operator operates, the endoscope needs to be withdrawn from the sheath 10 to effectively drain out substances such as liquid, blood, tissue, and broken stones. After the above substances flow out of the sheath 10, the endoscope is then introduced for operation. The repeated insertion and withdrawal of the endoscope directly determine the intraoperative safety and the operation duration. In the solution of this embodiment, the endoscope operates in the second inner cavity 121, and the above substances generated during the operation are drained out from the third inner cavity 122. The second inner cavity 121 and the third inner cavity 122 are isolated from each other. Therefore, the operation of the endoscope and the outflow of the above substances do not affect each other. During the operation, it is only necessary to withdraw the endoscope from the first inner cavity 111 to the second inner cavity 121, and there is no need to withdraw the entire sheath 10 completely. Thus, the time for the repeated insertion and withdrawal of the endoscope is reduced, and the operation efficiency is improved. Specifically, the conventional length of the existing sheath 10 is 450 mm, and the distance for each withdrawal and insertion of the endoscope is 900 mm. In this embodiment, according to the anatomical design of the urinary tract, the sheath 10 is divided into the first section 11 entering the upper urinary tract and the second section 12 entering the lower urinary tract. The endoscope only needs to be withdrawn to the second inner cavity 121 located in the lower urinary tract. In a specific implementation, the first section 11 entering the upper urinary tract can be designed to be 280 mm long according to the length of the ureter. Then, the distance for each withdrawal and insertion of the endoscope is only 560 mm, which is shortened by 37.8%, greatly improving the operation efficiency, saving the operation time, and reducing the intraoperative risk of the patient.

[0031] The outer contour of the second section 12 and the outer contour of the second inner cavity 121 may both be circular; see Figure 2 , in this embodiment, the cross-sectional area of the second inner cavity 121 in the transverse direction is the same as the cross-sectional area of the third inner cavity 122 in the transverse direction. It should be known that in the present utility model, the outer diameter dimension of the first section 11 or the second section 12 is the maximum diameter length of the outer contour of the cross-section perpendicular to the axial direction A, and the cross-sectional area is determined by this outer diameter length; the diameter length of its inner cavity is the maximum diameter length of the outer contour of the cross-section perpendicular to the axial direction A, and the cross-sectional area of the inner cavity is determined by this diameter length. For example, when the tube shape of the first section 11 or the second section 12 is circular, the outer diameter length is the diameter of the circle on the outer surface of the tube, and the cross-sectional area is the area of this outer surface circle. When the outer contour of the inner cavity is circular, the diameter length is the diameter of this surface circle, and the cross-sectional area is the area of this circle. The same applies to other shapes.

[0032] There are various ways to form an inner cavity in the sheath tube 10. For example, a cavity can be formed in a solid body as the inner cavity, or an inner tube can be embedded in the tube body to form the inner cavity. For example, the sheath tube 10 may include a second inner tube and a third inner tube embedded in the second section 12 along the axial direction A. The second inner tube forms the second inner cavity 121, and the third inner tube forms the third inner cavity 122.

[0033] See Figure 3 , based on the first embodiment, according to the second embodiment of the present utility model, the second inner cavity 121 of the guiding sheath 1 is an air inlet passage, and the third inner cavity 122 is an exhaust passage, that is, gas enters the sheath tube 10 from the second inner cavity 121 and exits the sheath tube 10 from the third inner cavity 122. Specifically, the guiding sheath 1 further includes a negative pressure mechanism, and the negative pressure mechanism includes a negative pressure regulating valve 21 and a negative pressure pump (not shown in the figure); the negative pressure regulating valve 21 is communicated with the second inner cavity 121, and the negative pressure pump is communicated with the third inner cavity 122. In this embodiment, the air flow entering the second inner cavity 121 can be controlled through the negative pressure regulating valve 21. Since the second inner cavity 121 and the third inner cavity 122 are isolated from each other, after the air flow C enters the second inner cavity 121 from the negative pressure regulating valve 21, it does not directly enter the negative pressure pump, but first flows through the second inner cavity 121, reaches the intersection of the first inner cavity 111, the second inner cavity 121 and the third inner cavity 122, and under the action of the negative pressure pump, reversely flows into the third inner cavity 122 and is finally discharged out of the body together with the tissue through the negative pressure pump.

[0034] In the prior art, since the second inner cavity 121 and the third inner cavity 122 are not provided to be isolated from each other, the air flow directly enters the negative pressure pump after flowing into the inner cavity from the negative pressure regulating valve 21. The air flow direction is as shown by the dotted arrow C1. The air flow does not act on the first inner cavity 111 and only flows through a small area section on the proximal side of the second section 12. In contrast, in the air flow direction in this embodiment, as shown by the solid arrow C, on the one hand, it can prevent substances such as liquid, blood, tissue, and gravel from entering the second inner cavity 121 through the reverse air flow acting on the tissue discharge in the second inner cavity 121. On the other hand, the increased air flow channel can act on the substances to be excluded at the first inner cavity 111, guide them to quickly flow into the third inner cavity 122 through negative pressure, and be accelerated to be discharged out of the body under the action of the negative pressure pump, avoiding the retention and accumulation of the above substances in the inner cavity, thereby improving the surgical efficiency, reducing the surgical time, and ensuring the safety of the patient during the operation.

[0035] In a specific embodiment of this embodiment, the guiding sheath 1 further includes a sheath tube seat 20 sleeved on the proximal end of the second section 12. The sheath tube seat 20 includes a guiding tube 22. The negative pressure regulating valve 21 is arranged on the sheath tube seat 20, and the communication between the second inner cavity 121 and the atmosphere is controlled through the negative pressure regulating valve 21. The guiding tube 22 is connected to the third inner cavity 122, and the negative pressure pump is communicated with the third inner cavity 122 through the guiding tube 22. Substances such as liquid, blood, tissue, and gravel are discharged out of the body through the guiding tube 22, and the air flow C also flows out of the body through the guiding tube 22. In this embodiment, the second inner cavity 121 is directly communicated with the atmosphere to regulate the inflowing air flow. Of course, this embodiment is only used as an example and is not a limitation on the present invention. Those of ordinary skill in the art can also use other air flow introduction methods, such as pump pressure input, etc., which will not be listed here.

[0036] See Figure 4 and Figure 5 , which is different from the first embodiment in that the maximum outer diameter of the first section 11 of the guiding sheath 1 according to the third embodiment of the present invention is smaller than the minimum outer diameter of the second section 12. In the human anatomical structure, the upper urinary tract includes the ureter and the kidney. The outer diameter of the adult ureter is usually 3 mm to 6 mm, and the lower urinary tract includes the urethra and the bladder. The outer diameter of the adult urethra is usually 7 mm to 15 mm. The first section 11 provided on the distal side usually extends into the ureter of the upper urinary tract, and the second section 12 provided on the proximal side can be placed in the lower urinary tract. Considering the outer diameter size of the urethra, the diameter length of the second section 12 can be increased relative to the diameter length of the first section 11. On the basis of not damaging the urethra, the increased diameter length can make the diameter lengths of the second inner cavity 121 and the third inner cavity 122 in the second section 12 increase accordingly, which is beneficial to the repeated entry and exit of the detection equipment and the surgical equipment, as well as the effective discharge of various tissue substances.

[0037] Further, see Figure 5, in a cross-section perpendicular to the axial direction A, the cross-sectional area of the second inner cavity 121 is smaller than that of the third inner cavity 122. The enlarged third inner cavity 122 can accelerate the rapid discharge of substances such as liquid, blood stains, tissues, and gravel, and it is not easy to form retention and accumulation in the inner cavity, ensuring surgical safety while improving surgical efficiency.

[0038] See Figures 6 to 10 , different from the first embodiment, the second section 12 of the guiding sheath 1 according to the fourth embodiment of the present invention further includes a fourth inner cavity 123 along the axial direction A. The first inner cavity 111 communicates with the fourth inner cavity 123, and the fourth inner cavity 123 is isolated from both the second inner cavity 121 and the third inner cavity 122. In this embodiment, the second inner cavity 121 can still be used as a functional cavity for accommodating detection equipment or surgical equipment for operation. The detection equipment can be a pressure measuring device, a temperature measuring device, etc., and the surgical equipment can be an endoscope, etc., which will not be listed one by one here. The third inner cavity 122 can still be used as a diversion channel, and substances such as liquid, blood stains, tissues, and gravel generated during detection or surgery can be discharged through the third inner cavity 122. The fourth inner cavity 123 can be used alone as an air flow channel. After air enters the sheath tube 10, it reaches the convergence point of multiple inner cavities through the fourth inner cavity 123, and returns and flows into the third inner cavity 122 under the action of a negative pressure pump, and is discharged through the third inner cavity 122 together with the discharged tissue. Of course, when the air flow is introduced into the fourth inner cavity 123, it can also be introduced into the second inner cavity 121 together.

[0039] It should be known that the fourth inner cavity 123 can also have other uses. For example, if other detections need to be carried out during the surgical operation, such as monitoring the temperature or pressure while crushing stones, the second inner cavity 121 can be used as an endoscope operation channel, the fourth inner cavity 123 can be used as an operation channel for pressure or temperature detection equipment, and the third inner cavity 122 can be used as a discharge channel for the above substances. The air flow flows in from the second inner cavity 121 and / or the fourth inner cavity 123, so as to realize real-time monitoring during the surgical process. It should be known that the functions of each inner cavity are not fixedly set and can be flexibly adjusted according to actual needs. Various function uses and their combinations will not be listed one by one.

[0040] See Figures 7 to 10, Further, the second section 12 further includes a fifth inner cavity 124 along the axial direction A. The first inner cavity 111 and the fifth inner cavity 124 are both communicated, and the fifth inner cavity 124 is isolated from the second inner cavity 121, the third inner cavity 122, and the fourth inner cavity 123 respectively. Preferably, in a cross-section perpendicular to the axial direction A, the fourth inner cavity 123 and the fifth inner cavity 124 are symmetrically distributed relative to the second inner cavity 121. In this embodiment, the second inner cavity 121 can still be used as a functional cavity for accommodating detection equipment or surgical equipment; the third inner cavity 122 can still be used as a diversion channel, and substances such as liquid, blood, tissue, and gravel generated during detection or surgery can be discharged through the third inner cavity 122; the fourth inner cavity 123 and the fifth inner cavity 124 can both be used as air flow channels separately. After air enters the sheath 10, it enters the fourth inner cavity 123 and the fifth inner cavity 124 simultaneously, reaches the convergence point of multiple inner cavities through the fourth inner cavity 123 and the fifth inner cavity 124, returns and flows into the third inner cavity 122 under the action of a negative pressure pump, and is discharged through the third inner cavity 122 together with the discharged tissue. Symmetrically setting two air flow channels can further improve the efficiency of discharging the above substances out of the body and save surgical time.

[0041] There are various contour shapes and relative position arrangements of multiple inner cavities in the second section 12. For example, the cross-sectional shape of the second inner cavity 121 can be circular, circular segment, etc., the cross-sectional shape of the third inner cavity 122 can be circular or semi-circular, etc., and the cross-sectional shapes of the fourth and fifth inner cavities 124 can be irregular shapes, etc., and no more examples are given here one by one.

[0042] The present invention also provides a ureteropyeloscope system, including any one of the above ureteral guiding sheaths 1. The ureteropyeloscope system may further include at least one of an endoscope, other detection equipment, or operating equipment, and the above endoscope, or other detection equipment or operating equipment movably penetrates through the inner cavity of the guiding sheath 1.

[0043] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0044] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ureteral guiding sheath, characterized in that, it includes a sheath tube, the sheath tube axially includes a first section and a second section, the first section includes a first inner cavity along the axis, and the second section includes a second inner cavity and a third inner cavity along the axis; the first inner cavity is respectively communicated with the second inner cavity and the third inner cavity, and the second inner cavity and the third inner cavity are isolated from each other; the second section further includes a fourth inner cavity and a fifth inner cavity along the axis, the first inner cavity is communicated with both the fourth inner cavity and the fifth inner cavity, and the fourth inner cavity and the fifth inner cavity are respectively isolated from the second inner cavity and the third inner cavity; in a cross-section perpendicular to the axis, the fourth inner cavity and the fifth inner cavity are symmetrically distributed relative to the second inner cavity.

2. The ureteral guiding sheath according to claim 1, characterized in that, the second section further includes a fourth inner cavity along the axis, the first inner cavity is communicated with the fourth inner cavity, and the fourth inner cavity is isolated from both the second inner cavity and the third inner cavity.

3. The ureteral guiding sheath according to claim 1, characterized in that, the sheath tube includes a second inner tube and a third inner tube axially embedded in the second section, the second inner tube forms the second inner cavity, and the third inner tube forms the third inner cavity.

4. The ureteral guiding sheath according to any one of claims 1-3, characterized in that, in a cross-section perpendicular to the axis, the cross-sectional area of the second inner cavity is smaller than the cross-sectional area of the third inner cavity.

5. The ureteral guiding sheath according to any one of claims 1-3, characterized in that, the axial length of the first section is 140 mm to 400 mm, and the maximum outer diameter of the first section does not exceed 6 mm.

6. The ureteral guiding sheath according to any one of claims 1-3, characterized in that, the maximum outer diameter of the first section is smaller than the minimum outer diameter of the second section.

7. The ureteral guiding sheath according to any one of claims 1-3, characterized in that, the guiding sheath further includes a negative pressure mechanism, the negative pressure mechanism includes a negative pressure regulating valve and a negative pressure pump; the negative pressure regulating valve is communicated with the second inner cavity, and the negative pressure pump is communicated with the third inner cavity.

8. The ureteral guiding sheath according to claim 7, characterized in that, the guiding sheath further includes a sheath tube seat sleeved on the end of the second section, the sheath tube seat includes a guiding tube; the negative pressure regulating valve is arranged on the sheath tube seat, and the communication between the second inner cavity and the atmosphere is controlled through the negative pressure regulating valve; the guiding tube is connected with the third inner cavity, and the negative pressure pump is communicated with the third inner cavity through the guiding tube.

9. A ureteropyeloscope system, characterized in that, it includes the ureteral guiding sheath according to any one of claims 1-8.

Images