Reducing bendable negative pressure sheath
By designing a bendable negative pressure sheath with a variable diameter, the existing ureteral negative pressure sheath is blocked and insufficient bending, achieving efficient stone removal and reducing mucosal damage, and improving surgical effect.
Patent Information
- Application Number
- CN202422108165.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The internal cavity is equally diametrically designed by the existing ureter negative pressure sheath, which makes the stone easily stuck and blocked, and the distal end of the sheath can not bend, so the stone cannot be completely removed.
A negative pressure sheath with variable diameter can be bent, and the outer diameter of the sheath tube gradually increases from the soft head to the sheath tube joint end, and the inner diameter increases accordingly. The soft head can be bent by 270 degrees. Combined with the sealing cap and the expansion tube, negative pressure stone discharge is achieved.
The sheath can pass through the kidney calyx smoothly, avoid blockage, improves the efficiency of stone removal, reduces the risk of mucosal damage, and improves the thoroughness and safety of the operation.
Smart Images
Figure CN223126637U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a variable-diameter bendable negative-pressure sheath. Background Art
[0002] The negative-pressure guiding sheath is mainly used in clinical practice for removing stones in the ureter, bladder, and kidney, and for establishing a surgical channel for related surgical treatments. Endoscopes, laser fibers, stone extraction instruments, or operating cables are introduced through the channel. Surgical steps: Under medical imaging, observe the position of the stone in the ureter, bladder, and kidney. Insert a ureteroscope or cystoscope through the urethral orifice, fix the position, insert a guide wire at its entrance, then withdraw the ureteroscope or cystoscope, and insert a ureteral negative-pressure sheath under the guidance of the guide wire to the stone extraction site. Pull out the guide wire and dilator, and introduce a flexible ureteroscope, endoscope, laser fiber, stone extraction instrument, etc. into the ureter, bladder, or renal pelvis through the sheath of the negative-pressure sheath for related surgical operations.
[0003] In the existing ureteral negative-pressure sheath, since the inner cavity of the sheath tube is of equal diameter, when aspirating stone slag after laser lithotripsy, the stone is likely to get stuck and blocked in the sheath tube. The distal end of the sheath tube of the existing ureteral negative-pressure sheath cannot be bent, resulting in the sheath tube not being able to reach some renal calyces and incomplete stone extraction. Summary of the Utility Model
[0004] Aiming at the deficiencies of the prior art, the utility model provides a variable-diameter bendable negative-pressure sheath, which solves the problem of relatively high use risk of the existing ureteral guiding sheath.
[0005] To achieve the above object, the utility model provides the following technical solutions:
[0006] A variable-diameter bendable negative-pressure sheath includes a sheath tube, a soft head of the sheath tube, a sheath tube joint, a dilator, a dilator joint, and a sealing cap; the sheath tube is a conical tube body, the sheath tube is a single cavity, one end of the sheath tube is connected with a soft head of the sheath tube, and the other end is connected with a sheath tube joint. The outer diameter of the sheath tube gradually increases from the soft head of the sheath tube to the sheath tube joint end. The soft head of the sheath tube is a bendable hose. The sheath tube joint is provided with an insertion port that can be inserted into the dilator orifice. The dilator enters the sheath tube through the dilator orifice. One end of the dilator is provided with a dilator joint that can be buckled on the sheath tube joint. When the dilator is not inserted into the sheath tube, the sheath tube joint is closed by a sealing cap.
[0007] Preferably, the outer diameter of the sheath tube gradually increases from the soft head of the sheath tube to the sheath tube joint end, and the corresponding inner diameter gradually increases from the soft head of the sheath tube to the sheath tube joint end, realizing a gradual increase in the volume of the corresponding lumen, and the stone slag passes smoothly through the inner channel of the tube sheath.
[0008] Preferably, the length of the soft head of the sheath tube is 9 cm, it can be bent 270°, and it can freely enter each small calyx of the renal pelvis retrogradely.
[0009] Preferably, the sheath tube joint is provided with a negative pressure interface, which is externally connected to a negative pressure source for stone removal by negative pressure.
[0010] Preferably, the sheath tube is composed of nylon PA, PTFE and stainless steel wire.
[0011] The beneficial effects of the present utility model are as follows: During urological surgery, it is convenient for the sheath tube to reach deep into each renal calyx for lithotripsy and suction of stones. Since the inner cavity of the sheath tube gradually increases, during the process of stone removal by negative pressure, the phenomenon of stone blockage of the sheath tube will not occur, and the stone suction is faster and smoother, and the stone removal is efficient. The soft head of the sheath tube is designed with a conical soft head, which can be rotated and bent by 270 degrees. It can accurately reach the position of the stone deep in the renal pelvis by retrograde penetration into each small calyx of the renal pelvis for lithotripsy, effectively controlling the recurrence rate of patients. The conical design of the sheath tube can reduce the damage to the urethral and ureteral mucosa and avoid complications caused by mucosal damage. Description of the Drawings
[0012] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0013] Figure 1 Structural schematic diagram of the present utility model.
[0014] Figure 2 Structural schematic diagram of the negative pressure sheath of the present utility model.
[0015] Figure 3 Structural schematic diagram of the dilator of the present utility model.
[0016] In the figure: 1 - soft end of the sheath tube; 2 - sheath tube; 3 - sheath tube joint; 4 - sealing cap; 5 - dilating tube; 6 - dilating tube joint; 7 - negative pressure interface. Detailed Embodiments
[0017] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0018] Please refer to Figures 1-3, a variable-diameter bendable negative pressure sheath, comprising a sheath tube 2, a soft head 1 of the sheath tube, a sheath tube joint 3, a dilator tube 5, a dilator tube joint 6 and a sealing cap 4; the sheath tube 2 is composed of nylon PA, polytetrafluoroethylene PTFE and stainless steel wires; the sheath tube 2 is a conical tube body, the sheath tube 2 is a single cavity, one end of the sheath tube 2 is connected with the soft head 1 of the sheath tube, the other end is connected with the sheath tube joint 3, the outer diameter of the sheath tube 2 gradually increases from the soft head 1 of the sheath tube to the sheath tube joint 3 end, the soft head 1 of the sheath tube is a bendable hose, the sheath tube joint 3 is provided with an insertion opening that can be inserted into the dilator tube orifice, the dilator tube 5 enters the sheath tube 2 from the dilator tube orifice, one end of the dilator tube 5 is provided with a dilator tube joint 6 that can be buckled on the sheath tube joint 3, when the dilator tube 5 is not inserted into the sheath tube 2, the sheath tube joint 3 is closed by the sealing cap 4, the sheath tube joint 3 is provided with a negative pressure interface 7, externally connected to a negative pressure source for negative pressure stone removal.
[0019] The outer diameter of the sheath tube 2 gradually increases from the soft head 1 of the sheath tube to the sheath tube joint 3 end, and the corresponding inner diameter gradually increases from the soft head 1 of the sheath tube to the sheath tube joint 3 end.
[0020] The length of the soft head 1 of the sheath tube is 9 cm, it can be bent 270°, and it can freely enter each minor calyx of the renal pelvis retrogradely.
[0021] In a specific embodiment, under medical imaging, observe the position of stones in the ureter, bladder, and kidney, introduce a ureteroscope or cystoscope through the urethral orifice, fix the position, after inserting a guide wire at its inlet, withdraw the ureteroscope or cystoscope, and insert a ureteral sheath to the stone removal site under the guidance of the guide wire, pull out the guide wire and the dilator tube, and introduce a ureteroscope, endoscope, laser optical fiber, stone removal instrument, etc. into the ureter, bladder, or renal pelvis through the guiding sheath for relevant surgical operations.
[0022] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A variable-diameter bendable negative pressure sheath, comprising a sheath tube (2), a soft head of the sheath tube (1), a sheath tube joint (3), a dilation tube (5), a dilation tube joint (6) and a sealing cap (4); characterized in that, The sheath tube (2) is a conical tube body, the sheath tube (2) is a single cavity body, one end of the sheath tube (2) is connected with a soft head of the sheath tube (1), and the other end is connected with a sheath tube joint (3). The outer diameter of the sheath tube (2) gradually increases from the soft head of the sheath tube (1) to the end of the sheath tube joint (3). The soft head of the sheath tube (1) is a flexible hose. The sheath tube joint (3) is provided with an insertion opening for the dilator tube. The dilator tube (5) enters the sheath tube (2) through the insertion opening for the dilator tube. One end of the dilator tube (5) is provided with a dilator tube joint (6) that can be buckled on the sheath tube joint (3). When the dilator tube (5) is not inserted into the sheath tube (2), the sheath tube joint (3) is closed by a sealing cap (4).
2. The variable-diameter bendable negative pressure sheath according to claim 1, wherein The outer diameter of the sheath tube (2) gradually increases from the soft head of the sheath tube (1) to the end of the sheath tube joint (3), and the corresponding inner diameter gradually increases from the soft head of the sheath tube (1) to the end of the sheath tube joint (3).
3. A variable-diameter bendable negative pressure sheath according to claim 1, characterized in that, The length of the soft head of the sheath tube (1) is 9 cm, it can be bent 270°, and can freely enter each minor calyx of the renal pelvis retrogradely and clearly.
4. The variable-diameter bendable negative pressure sheath according to claim 1, wherein The sheath tube joint (3) is provided with a negative pressure interface (7).
5. The variable-diameter bendable negative pressure sheath according to claim 1, characterized in that, The sheath tube (2) is composed of nylon PA, polytetrafluoroethylene PTFE and stainless steel wire.