Flexible ureteral access sheath with bendable tendon driving far end
By designing a flexible ureteral pathway sheath with tendon drive distal bendable, the problem of the difficulty of guiding sheath through physiological narrow positions in the prior art is solved, and flexible insertion and efficient fluid discharge of the guiding sheath are achieved, reducing the risk of intraoperative complications.
Patent Information
- Application Number
- CN202421479710.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The existing straight-tube-type ureteral guide sheath is difficult to pass through the physiological narrow position at the junction of the ureter and the renal pelvis during the sheathing process, which can easily lead to ureteral mucosa damage, perforation, fracture and bleeding, which in turn causes problems such as intraoperative lavage fluid drainage, excessive renal pelvic pressure and urinary sepsis.
A tendon-driven flexible ureteral access sheath is designed, including a sheath base, a guide sheath, a drive device and a negative pressure suction assembly. The guide sheath has a rigid segment and a flexible end, and a bending structure is provided in the flexible end. The bending of the flexible end is controlled by the driving device to achieve flexible insertion and negative pressure suction of the guide sheath.
This design allows the guide sheath to reach all corners of the renal pelvis smoothly, improves the injection accuracy of perfused fluid, reduces the risk of ureteral damage, and accelerates the discharge of gravel and liquid through negative pressure suction, reducing the occurrence of intraoperative complications.
Smart Images
Figure CN222899947U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of urinary medical devices, and particularly relates to a tendon-driven flexible ureteral access sheath with a bendable distal end. Background Art
[0002] A ureteral guiding sheath is a medical device used in urological surgeries. Its main function is to provide a passage during the surgery to assist endoscopes and surgical instruments to enter the urinary tract, for examining whether the renal pelvis, ureter, bladder, and urethra are normal, and providing sufficient diagnostic information for doctors to treat diseases. With the progress of medical technology and the development of the concept of minimally invasive surgery, minimally invasive treatment of urinary system stones through ureteroscopy is increasingly favored by patients and clinicians.
[0003] Before ureteroscopic lithotripsy, a guiding sheath needs to be inserted into the patient's body to establish an access passage for medical devices such as ureteroscopes and a passage for stone drainage. The passage connecting the outside and the inside constructed by the guiding sheath can reduce the damage to the human body caused by the repeated entry and exit of the ureteroscope during the surgery.
[0004] The current ureteral guiding sheath is in the form of a straight tube sheath, and the texture of the sheath tube is relatively hard. During the sheath insertion process, it is very difficult for the sheath tube to pass through the physiological stenosis at the junction of the ureter and the renal pelvis, and problems such as ureteral mucosal injury, perforation, rupture, and bleeding are likely to occur. In severe cases, complications may even occur, causing harm to the patient. Patients who have undergone multiple ureteral and adjacent organ surgeries are prone to ureteral perforation or the guiding sheath tube not being placed in place, which may lead to problems such as unsmooth drainage of intraoperative irrigation fluid, excessive renal pelvic pressure, and urosepticemia. Content of the Utility Model
[0005] The purpose of the utility model is to provide a tendon-driven flexible ureteral access sheath with a bendable distal end to solve the above problems.
[0006] To achieve the above purpose, the utility model provides the following solution:
[0007] A tendon-driven flexible ureteral access sheath with a bendable distal end, comprising:
[0008] A sheath tube seat;
[0009] A through hole opened in the sheath tube seat;
[0010] A guiding sheath, one end of which is fixedly connected to the sheath tube seat, and the guiding sheath is communicated with the through hole; the guiding sheath includes a rigid section, one end of the rigid section is fixedly connected to the sheath tube seat, the other end of the rigid section is fixedly connected with a flexible end, and a bending structure is arranged inside the flexible end;
[0011] A driving device is arranged on the sheath tube base, and the bending structure is in transmission connection with the driving device;
[0012] A negative pressure suction assembly is arranged on the sheath tube base and communicated with the through hole.
[0013] Preferably, the rigid section includes:
[0014] A sheath tube, one end of which is fixedly connected to the sheath tube base, and the sheath tube is communicated with the through hole;
[0015] A sheath tube outer membrane is wrapped outside the sheath tube. The length of the sheath tube outer membrane is less than the length of the sheath tube, and one end of the sheath tube outer membrane is fixedly connected to the sheath tube base.
[0016] Preferably, the flexible end includes:
[0017] A bending rubber is wrapped outside the sheath tube. The bending rubber is located at one end of the sheath tube away from the sheath tube base. One end of the bending rubber is fixedly connected to the sheath tube outer membrane, and the other end is fixedly connected to the end of the sheath tube.
[0018] Preferably, the bending structure includes:
[0019] Two arc-shaped grooves are formed on the outer side wall of the sheath tube. The two arc-shaped grooves are arranged along the length direction of the sheath tube, and the two arc-shaped grooves are symmetrically arranged about the axis center of the sheath tube;
[0020] A plurality of beam frames are arranged at equal intervals along the length direction of the arc-shaped groove. The beam frames are adapted to the arc-shaped groove, and the beam frames are fixedly connected to the arc surface of the arc-shaped groove.
[0021] Preferably, the driving device includes:
[0022] A traction wire is arranged in the arc-shaped groove. One end of the traction wire is fixedly connected to the end of the bending rubber away from the sheath tube base, and the other end passes through the sheath tube outer membrane;
[0023] An adjusting knob is rotatably connected to the sheath tube base. One end of each of the two traction wires passing through the sheath tube outer membrane is fixedly installed on the adjusting knob, and the two traction wires are respectively located at the top and bottom of the adjusting knob;
[0024] An adjusting seat is fixedly connected to the adjusting knob.
[0025] Preferably, a lining spring is arranged between the sheath tube and the bending rubber.
[0026] Preferably, the negative pressure suction assembly includes:
[0027] The negative pressure tube is fixedly connected to the sheath tube seat. The negative pressure tube communicates with the through hole. The included angle between the axis of the negative pressure tube and the axis of the sheath tube seat is less than 90°, and this included angle is away from the sheath tube.
[0028] Compared with the prior art, the utility model has the following advantages and technical effects:
[0029] In the utility model, the guiding sheath is inserted into the renal pelvis of the human body through the urethra, bladder and ureter. After the guiding sheath is inserted to an appropriate depth, medical staff control the flexible end at the distal end of the guiding sheath through the driving device to make the flexible end bend, and insert the flexible ureteroscope into the renal pelvis through the guiding sheath. The flushing liquid enters the renal pelvis from the endoscopic channel, and the crushed stones and liquid are discharged from the gap between the endoscope and the sheath tube and then sucked out by the negative pressure suction assembly. At this time, the inside of the sheath tube is under negative pressure, which can accelerate the discharge of crushed stones, floccules and the liquid in the ureter out of the body.
[0030] The utility model can enable the guiding sheath to smoothly reach all corners of the renal pelvis, so that the perfusion liquid can be accurately injected into the affected part of the patient through the guiding sheath. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:
[0032] Figure 1 is the overall schematic diagram of the present utility model;
[0033] Figure 2 is the structural schematic diagram of the sheath tube seat in the present utility model;
[0034] Figure 3 is the internal structural schematic diagram of the sheath tube seat in the present utility model;
[0035] Figure 4 is the structural schematic diagram of the driving device in the present utility model;
[0036] Figure 5 is the cross-sectional view of the flexible end in the present utility model;
[0037] Figure 6 is Figure 1 the A-A cross-sectional view in;
[0038] Among them, 1. guiding sheath; 2. sheath tube seat; 3. driving device; 4. negative pressure tube; 5. traction wire; 11. flexible end; 12. outer sheath membrane of the sheath tube; 13. rigid section; 14. inner lining spring; 15. sheath tube; 21. through hole; 31. adjusting knob; 32. adjusting seat; 111. bending rubber; 112. beam frame. Detailed implementation manners
[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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.
[0040] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.
[0041] Refer to Figures 1 to 6 , the present invention discloses a tendon-driven flexible ureteral access sheath with a bendable distal end, including:
[0042] Sheath tube seat 2;
[0043] Through hole 21, opened in the sheath tube seat 2;
[0044] Guiding sheath 1, one end of which is fixedly connected to the sheath tube seat 2, and the guiding sheath 1 is communicated with the through hole 21; the guiding sheath 1 includes a rigid section 13, one end of the rigid section 13 is fixedly connected to the sheath tube seat 2, and the other end of the rigid section 13 is fixedly connected with a flexible end 11, and a bending structure is arranged inside the flexible end 11;
[0045] Driving device 3, arranged on the sheath tube seat 2, and the bending structure is in transmission connection with the driving device 3;
[0046] Negative pressure suction assembly, arranged on the sheath tube seat 2 and communicated with the through hole 21.
[0047] In the present invention, the guiding sheath 1 is inserted into the renal pelvis of the human body through the urethra, bladder, and ureter. After the guiding sheath 1 is inserted to an appropriate depth, medical staff controls the flexible end 11 at the distal end of the guiding sheath 1 through the driving device 3 to bend the flexible end 11. The ureteroscope is inserted into the renal pelvis through the guiding sheath 1. The flushing liquid enters the renal pelvis from the endoscopic channel, and the crushed stones and liquid are discharged from the gap between the endoscope and the sheath tube 15 and then sucked out by the negative pressure suction assembly. At this time, the inside of the sheath tube 15 is under negative pressure, which can accelerate the discharge of crushed stones, floccules, and the liquid in the ureter out of the body.
[0048] Further optimized solution, the rigid section 13 includes:
[0049] The sheath tube 15 is fixedly connected to the sheath tube base 2 at one end, and the sheath tube 15 communicates with the through hole 21;
[0050] The outer membrane 12 of the sheath tube is wrapped around the outside of the sheath tube 15. The length of the outer membrane 12 of the sheath tube is less than the length of the sheath tube 15, and one end of the outer membrane 12 of the sheath tube is fixedly connected to the sheath tube base 2.
[0051] The sheath tube 15 serves as the main structural part of the guiding sheath 1, and is used to guide the insertion of the flexible ureteroscope and discharge the crushed stones, flocs and liquid in the ureter. The outer membrane 12 of the sheath tube has a certain hardness and can be bent, and can adapt to the human body environment.
[0052] In a further optimized solution, the flexible end 11 includes:
[0053] The bending rubber 111 is wrapped around the outside of the sheath tube 15. The bending rubber 111 is located at the end of the sheath tube 15 away from the sheath tube base 2. One end of the bending rubber 111 is fixedly connected to the outer membrane 12 of the sheath tube, and the other end of the bending rubber 111 is fixedly connected to the end of the sheath tube 15.
[0054] Among them, the hardness of the outer membrane 12 of the sheath tube is higher than the hardness of the bending rubber 111. The rigid section 13 has a higher hardness relative to the flexible end 11, but the rigid section 13 is also deformable.
[0055] In a further optimized solution, the bending structure includes:
[0056] Two arc-shaped grooves are formed on the outer side wall of the sheath tube 15. The two arc-shaped grooves are arranged along the length direction of the sheath tube 15, and the two arc-shaped grooves are symmetrically arranged about the axis center of the sheath tube 15;
[0057] A plurality of beam frames 112 are arranged at equal intervals along the length direction of the arc-shaped groove. The beam frames 112 are adapted to the arc-shaped groove, and the beam frames 112 are fixedly connected to the arc surface of the arc-shaped groove.
[0058] The setting of the beam frame 112 is to increase the strength of the arc-shaped groove without affecting the bending of the sheath tube 15.
[0059] In a further optimized solution, the driving device 3 includes:
[0060] The traction wire 5 is arranged in the arc-shaped groove. One end of the traction wire 5 is fixedly connected to the end of the bending rubber 111 away from the sheath tube base 2, and the other end passes through the outer membrane 12 of the sheath tube; the traction wire 5 is a nickel-titanium alloy wire;
[0061] The adjusting knob 31 is rotatably connected to the sheath tube base 2. One end of the two traction wires 5 passing through the outer membrane 12 of the sheath tube is fixedly installed on the adjusting knob 31, and the two traction wires 5 are respectively located at the top and bottom of the adjusting knob 31;
[0062] The adjusting seat 32 is fixedly connected to the adjusting knob 31.
[0063] By driving the adjusting knob 31 to rotate through the adjusting seat 32, the elongation / shortening of the two traction wires 5 can be adjusted, and further the bending of the flexible end 11 of the sheath tube 15 can be adjusted.
[0064] In a further optimized solution, a lining spring 14 is provided between the sheath tube 15 and the bending rubber 111.
[0065] On the one hand, the lining spring 14 increases the structural strength of the guiding sheath 1, avoiding the fracture or flattening of the guiding sheath 1 during use. On the other hand, the setting of the lining spring 14 makes the guiding sheath 1 have a certain toughness, making it more convenient to use.
[0066] Among them, the lining spring 14 can be coated on the outer side of the entire sheath tube 15 to increase the overall strength of the device.
[0067] In a further optimized solution, the negative pressure suction assembly includes:
[0068] A negative pressure tube 4, fixedly connected to the sheath tube seat 2, the negative pressure tube 4 is communicated with the through hole 21, and the included angle between the axis of the negative pressure tube 4 and the axis of the sheath tube seat 2 is less than 90°, and the included angle is away from the sheath tube 15.
[0069] The negative pressure tube 4 is communicated with an external suction device, so as to accelerate the discharge of crushed stones, flocs and the liquid in the ureter out of the body.
[0070] Specific working steps:
[0071] Insert the guiding sheath 1 into the renal pelvis of the human body through the urethra, bladder and ureter. After the guiding sheath 1 is inserted to an appropriate depth, the medical staff controls the rotation of the adjusting knob 31 through the adjusting seat 32, and then controls the elongation / shortening of the two traction wires 5, controls the flexible end 11 at the distal end of the guiding sheath 1, makes the flexible end 11 bend, inserts the ureteroscope into the renal pelvis through the guiding sheath 1, the flushing liquid enters the renal pelvis from the endoscopic channel, and the crushed stones and liquid are discharged from the gap between the endoscope and the sheath tube 15 and sucked out through the negative pressure tube 4. At this time, the inside of the sheath tube 15 is under negative pressure, which can accelerate the discharge of crushed stones, flocs and the liquid in the ureter out of the body.
[0072] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0073] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.
Claims
1. A tendon-driven distally bendable flexible ureteral access sheath, characterized in that: include: Sheath seat (2); A through hole (21) is provided in the sheath tube seat (2); A guide sheath (1), one end of which is fixedly connected to the sheath tube seat (2), and the guide sheath (1) is in communication with the through hole (21); the guide sheath (1) comprises a rigid section (13), one end of which is fixedly connected to the sheath tube seat (2), and the other end of which is fixedly connected to a flexible end (11), wherein a bending structure is arranged inside the flexible end (11); A driving device (3) is arranged on the sheath tube seat (2), and the bending structure is in driving connection with the driving device (3); A negative pressure suction component is arranged on the sheath tube seat (2) and is connected to the through hole (21).
2. A tendon-driven distally bendable flexible ureteral access sheath according to claim 1, characterized in that: The rigid section (13) comprises: A sheath tube (15), one end of which is fixedly connected to the sheath tube seat (2), and the sheath tube (15) is connected to the through hole (21); The sheath tube outer coating (12) is coated on the outside of the sheath tube (15), the length of the sheath tube outer coating (12) is shorter than the length of the sheath tube (15), and one end of the sheath tube outer coating (12) is fixedly connected to the sheath tube seat (2).
3. A tendon-driven distally bendable flexible ureteral access sheath according to claim 2, characterized in that: The flexible end (11) comprises: A bending rubber (111) is wrapped around the outside of the sheath tube (15). The bending rubber (111) is located at one end of the sheath tube (15) away from the sheath tube seat (2). One end of the bending rubber (111) is fixedly connected to the sheath tube outer membrane (12), and the other end of the bending rubber (111) is fixedly connected to the end of the sheath tube (15).
4. A tendon-driven distally bendable flexible ureteral access sheath according to claim 3, characterized in that: The curved structure comprises: Two arc-shaped grooves are provided on the outer side wall of the sheath tube (15), the two arc-shaped grooves are arranged along the length direction of the sheath tube (15), and the two arc-shaped grooves are arranged symmetrically along the axis of the sheath tube (15); A plurality of beam frames (112) are arranged at equal intervals along the length direction of the arc-shaped groove, the beam frames (112) are adapted to the arc-shaped groove, and the beam frames (112) are fixedly connected to the arc surface of the arc-shaped groove.
5. A tendon-driven distally bendable flexible ureteral access sheath according to claim 4, characterized in that: The driving device (3) comprises: A traction wire (5) is inserted into the arc groove, one end of the traction wire (5) is fixedly connected to one end of the curved rubber (111) away from the sheath tube seat (2), and the other end of the traction wire (5) passes through the outer membrane of the sheath tube (12); An adjusting knob (31) is rotatably connected to the sheath tube seat (2), and one end of the two traction wires (5) passing through the outer membrane (12) of the sheath tube is fixedly mounted on the adjusting knob (31), and the two traction wires (5) are respectively located at the top and bottom ends of the adjusting knob (31); The adjusting seat (32) is fixedly connected to the adjusting knob (31).
6. A tendon-driven distally bendable flexible ureteral access sheath according to claim 4, characterized in that: An inner lining spring (14) is provided between the sheath tube (15) and the bending rubber (111).
7. A tendon-driven distally bendable flexible ureteral access sheath according to claim 1, characterized in that: The negative pressure suction component comprises: A negative pressure tube (4) is fixedly connected to the sheath tube seat (2); the negative pressure tube (4) is connected to the through hole (21); the angle between the axis of the negative pressure tube (4) and the axis of the sheath tube seat (2) is less than 90°, and the angle is away from the sheath tube (15).