Instant and controllable negative pressure suction sheath
By designing a instant and controllable negative pressure attraction sheath, the problems of low lithotripsy efficiency, long distance for stone extraction, and untimely and controllable negative pressure attraction in percutaneous nephroscopic lithotripsy are solved, and a more efficient and safer surgical process is achieved.
Patent Information
- Application Number
- CN202421672368.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-16
AI Technical Summary
In percutaneous nephroscopic lithography, traditional negative pressure attraction sheaths have problems such as low efficiency of lithotripsy, long distance of stone extraction, and untimely and controllable negative pressure attraction, resulting in high difficulty in surgery and increased risk of complications.
A real-time and controllable negative pressure suction sheath is designed, including a sheath tube joint, a negative pressure joint, a first straight tube, a conical tube and a second straight tube. The negative pressure size and gravel discharge are controlled through the stone discharge hole. The conical tube connects the first straight tube and the second straight tube to control the puncture distance, and reduces the outer diameter of the puncture channel to reduce damage to the kidneys.
It achieves higher gravel efficiency, shorter stone extraction distance, and better negative pressure control, reducing the difficulty of surgery and complication risk, and improving the safety and efficiency of surgery.
Smart Images
Figure CN222968997U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to an instantaneously controllable negative pressure suction sheath. Background Technique
[0002] Percutaneous nephrolithotomy (PCNL) is one of the important methods for treating patients with kidney stones (>2 cm). A large amount of perfusion water is required during percutaneous nephrolithotomy to flush the collecting system, keep the intraoperative field of view clear, and flush out the crushed stone powder. As mentioned in "Application of Negative Pressure Stone Removal Sheath in Percutaneous Nephrolithotomy" published by authors such as He Yongzhong, Sheng Ming, and Lai Dehui in the Journal of Modern Urology: A large amount of perfusion in a short time during the operation increases the intrarenal pelvic pressure, which can be as high as 200 mmHg, far higher than the reflux threshold. With the prolongation of the stone removal time, bacteria and endotoxins are absorbed into the blood along with the perfusion fluid, and the incidence of postoperative fever and sepsis increases significantly. The incidence of postoperative fever can be as high as 21.0% - 32.1%, and 0.3% - 4.7% of patients develop into sepsis, which can cause septic shock or multiple organ failure, and even death in severe cases. In order to reduce the intrarenal pelvic pressure and the occurrence of postoperative complications, a variety of auxiliary devices or instruments for reducing the intrarenal pelvic pressure during the operation have emerged accordingly. The appearance of the negative pressure suction sheath, compared with other devices, is simple, easy to operate, economical and convenient, and worthy of popularization.
[0003] However, it is found during the operation that some negative pressure suction sheaths have the following problems: First, it is difficult to completely powderize kidney stones during the lithotripsy process, and the crushed stones attracted by the negative pressure suction sheath are easy to become stuck and jammed in the sheath, and the operator needs to perform lithotripsy again in the sheath, resulting in a reduction in the lithotripsy efficiency; second, the traditional negative pressure suction sheath has a long distance for attracting stones, and the operator needs to retract the nephroscope to the bifurcation of the negative pressure sheath. However, there is a certain angle at the bifurcation of the negative pressure sheath, which reduces the efficiency of negative pressure suction; finally, the attraction force of the negative pressure suction sheath is a continuous attraction force, which may cause relatively less perfusion water in the renal pelvis, resulting in a poor field of view, especially in the case of a bleeding field of view, which is not conducive to the progress of the operation. Summary of the Invention
[0004] The utility model provides an instantaneously controllable negative pressure suction sheath that is more minimally invasive, has a fast stone removal rate, is not easy for crushed stones to get stuck in the sheath tube, and has a clear surgical operation field of view, solves the problems of low current lithotripsy efficiency, long stone removal distance, and relatively less water in the renal pelvis caused by long-term negative pressure suction, resulting in a poor lithotripsy field of view, reduces the surgical difficulty, and improves the lithotripsy efficiency.
[0005] The utility model provides an instantaneously controllable negative pressure suction sheath, which comprises a sheath tube joint, a negative pressure joint arranged on the side wall of the sheath tube joint, and a sheath tube coaxially connected to the sheath tube joint; a negative pressure interface is arranged on the side wall of the sheath tube joint, and the negative pressure joint is connected to the negative pressure interface; the sheath tube comprises a first straight tube connected to the sheath tube joint, a conical tube connected to the end of the first straight tube, and a second straight tube connected to the end of the conical tube; a stone discharging hole for controlling the magnitude of negative pressure is arranged on the first straight tube, and the distance between the stone discharging hole and the end of the second straight tube is 10-12 cm; the magnitude of negative pressure at the end of the second straight tube is adjusted and controlled through the stone discharging hole.
[0006] Preferably, the stone discharging hole is an oval through hole.
[0007] Preferably, the diameter of the stone discharging hole is 6 mm.
[0008] Preferably, the length of the second straight tube is 5 cm.
[0009] Preferably, the outer diameter of the sheath tube joint is greater than the outer diameter of the first straight tube; the outer diameter of the first straight tube is greater than the outer diameter of the second straight tube; the outer diameter at the front end of the conical tube is the same as the outer diameter of the first straight tube, and the outer diameter at the end of the conical tube is the same as the outer diameter of the second straight tube.
[0010] Preferably, the central points of the sheath tube joint, the first straight tube, the conical tube, and the second straight tube are on the same straight line.
[0011] Preferably, the sheath tube is of an integrally formed structure.
[0012] Preferably, a PAM hydrophilic coating is attached to the outer surface of the sheath tube.
[0013] Preferably, a PTFE hydrophobic coating is attached to the inner cavity wall of the sheath tube.
[0014] Compared with the prior art, the utility model has the advantages of less trauma, high lithotripsy efficiency, short stone extraction distance, instant and controllable negative pressure, etc., and has broad market prospects and good economic value. The utility model opens a stone discharge hole on the first straight tube, so that the crushed stones can be discharged from the stone discharge hole, shortening the distance for discharging the crushed stones; when it is necessary to attract and extract stones, the operator can use the thumb or index finger of the left hand to block the notch to increase the instantaneous negative pressure attraction intensity and promote the rapid discharge of stones; the elliptical stone discharge hole design of the first straight tube makes the water outlet area larger than the water inlet area, and the intrarenal pelvis pressure will be lower. When lithotripsy is required, the lithotripsy vision is clearer; the first straight tube and the second straight tube are designed with different outer diameters, and the first straight tube and the second straight tube are connected by a tapered tube, so that the operator can better control the puncture distance of the negative pressure attraction sheath; the outer diameter of the first straight tube is larger than that of the second straight tube, and the smaller puncture channel causes less damage to the kidney, and can make the air pressure in the sheath tube lower than the intrarenal pelvis pressure, making the process of discharging water and crushed stones out of the body smoother and improving the stone extraction efficiency; a PAM hydrophilic coating is provided on the outer surface of the sheath tube, and the coating has long-lasting lubrication, making the process of the sheath tube entering the puncture channel smoother and having better biocompatibility; a hydrophobic coating is provided on the inner side wall of the sheath tube, which is beneficial to drainage and the delivery and extraction of instruments. Brief Description of the Drawings
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are 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.
[0016] Figure 1 It is a schematic structural diagram of the present utility model.
[0017] Figure 2 It is a schematic side view structural diagram of the present utility model.
[0018] Wherein, sheath tube joint 1; negative pressure joint 2; sheath tube 3; first straight tube 31; tapered tube 32; second straight tube 33; stone discharge hole 34. Detailed Embodiments
[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.
[0020] Such as Figures 1 to 2As shown in the figure, an instantaneously controllable negative pressure aspiration sheath includes a sheath tube joint 1, a negative pressure joint 2 provided on the side wall of the sheath tube joint 1, and a sheath tube 3 coaxially connected to the sheath tube joint 1; a negative pressure interface is provided on the side wall of the sheath tube joint 1, and the negative pressure joint 2 is connected to the negative pressure interface; the sheath tube 3 includes a first straight tube 31 connected to the sheath tube joint 1, a conical tube 32 connected to the end of the first straight tube 31, and a second straight tube 33 connected to the end of the conical tube 32. The sheath tube 3 is an integrally formed structure, making the finished product of the negative pressure aspiration sheath smoother and more convenient for clinical use; in this embodiment, the sheath tube joint 1, the negative pressure joint 2, and the sheath tube 3 are all hollow pipes, and the inner cavity of the sheath tube joint 1 is used for operating instruments to enter; the negative pressure joint 2 is used to connect a negative pressure device to adjust the air pressure in the renal pelvis and reduce the perfusion volume and perfusion pressure of the perfusion water in the kidney.
[0021] A stone discharge hole 34 is provided on the first straight tube 31. The stone discharge hole 34 is used to control the magnitude of the negative pressure and discharge larger stones out of the body through the stone discharge hole 34; the stone discharge hole 34 is an oval through hole, which is convenient to press the stone discharge hole 34 with the thumb or index finger. When the stone discharge hole 34 is held down, the air pressure in the sheath tube 3 is lower than the pressure in the renal pelvis, and the stone can be sucked out under the action of the negative pressure. When the stone discharge hole 34 is released, the sheath tube 3 does not have a negative pressure effect in the renal pelvis, which can improve the vision of lithotripsy and facilitate laser lithotripsy operation. In order to facilitate the finger to block the stone discharge hole 34, the size of the stone discharge hole 34 is set to a diameter of 6 mm, so that a single finger can block the notch, enabling the operator to block the notch with the left thumb or index finger to increase the instantaneous negative pressure aspiration intensity and promote the rapid discharge of the stone.
[0022] After a large number of clinical surgeries, it has been found that the larger the sheath tube, the larger the puncture channel required, which causes higher harm to the patient, and the longer the hospitalization time and wound recovery time required by the patient. Therefore, during the actual use of the negative pressure aspiration sheath, while ensuring a clear lithotripsy field of view during the operation, it is necessary to minimize the outer diameter of the negative pressure aspiration sheath as much as possible. Generally, the thickness of the renal parenchyma of a patient is 0.5 - 3 cm, and the distance between the position where lithotripsy is required and the body surface is 6 - 7 cm. Therefore, the length of the second straight tube 33 is set to 5 cm, and the outer diameter of the second straight tube 33 is 16Fr, 18Fr or other sizes, which can be determined according to the patient's age and body size. The distance between the stone discharge hole 34 and the end of the second straight tube 33 is 10 - 12 cm, so that the second straight tube 33 and the smaller-diameter part of the conical tube 32 enter the puncture channel, which is convenient for the operator to control the length of the sheath tube 3 entering the puncture channel and prevent the sheath tube 3 from entering the puncture channel too deeply; in this embodiment, the outer diameter of the second straight tube 33 is 18Fr, and the distance between the stone discharge hole 34 and the end of the second straight tube 33 is 10 cm. On the one hand, it can shorten the distance for the crushed stones to be discharged out of the body, and on the other hand, it is convenient for the operator to hold the sheath tube 3 and use a finger to block the stone discharge hole 34, reducing the probability of the crushed stones getting stuck in the sheath tube 3 and improving the stone extraction rate.
[0023] In order to more conveniently discharge the perfusion water out of the body, the sheath tube 3 is designed into a structure with multiple different pipe diameters; the outer diameter of the sheath tube joint 1 is larger than the outer diameter of the first straight tube 31; the outer diameter of the first straight tube 31 is larger than the outer diameter of the second straight tube 33; the conical tube is a frustum structure with a large front end and a small rear end and a hollow interior. Among them, the outer diameter of the front end of the conical tube 32 is the same as the outer diameter of the first straight tube 31, and the outer diameter of the end of the conical tube 32 is the same as the outer diameter of the second straight tube 33; since the perfusion water flow will be continuously injected during the operation, resulting in an increase in the renal pelvic pressure, designing the outer diameter of the first straight tube 31 to be larger than the outer diameter of the second straight tube 33 can increase the space inside the sheath tube 3 while keeping the pipe diameter of the part of the sheath tube 3 entering the puncture channel unchanged, making the air pressure inside the sheath tube 3 less than the renal pelvic pressure. Without connecting the negative pressure device, the perfusion water flow can also be discharged out of the body, keeping the renal pelvic pressure lower and more stable.
[0024] For the convenience of the operator, the center points of the sheath tube joint, the first straight tube, the conical tube, and the second straight tube are on the same straight line, which is convenient for the operator to operate the instrument to convey the instrument and remove the instrument from the puncture channel, improving the convenience and practicality of the equipment operation.
[0025] To improve the practicality and safety of the sheath tube, a PAM hydrophilic coating is attached to the outer surface of the sheath tube 3. The coating provides long-lasting lubrication, making it smoother for the sheath tube 3 to enter the puncture channel and having better biocompatibility. A PTEF hydrophobic coating is attached to the inner cavity side wall of the sheath tube 3, making the process of draining irrigation water and stone fragments out of the body smoother, facilitating the delivery and removal of instruments, and increasing the convenience and practicality of surgical operations.
[0026] The beneficial effects of the present utility model are as follows: The sheath tube adopts a multi-section structure design with different outer diameters. Without increasing the outer diameter of the part of the sheath tube entering the puncture channel, the inner cavity space of the sheath tube is increased, the drainage efficiency is improved, the renal pelvic pressure is kept stable, and it is more convenient for the operator to hold, reducing the difficulty of controlling the sheath tube. The stone discharge hole is arranged on the first straight tube and is 10 cm away from the end of the second straight tube, shortening the stone extraction distance, reducing the friction during the discharge process over time, improving the efficiency of lithotripsy and stone extraction, and shortening the operation time. The negative pressure is immediately controllable. When it is necessary to aspirate stones and extract them, the operator can block the notch with the thumb or index finger of the left hand to increase the instantaneous negative pressure aspiration intensity, prompting the stones to be discharged quickly. When lithotripsy is required, the notch is not pressed, and the lithotripsy field of view is clearer. At this time, the water outlet area of the irrigation water is larger than the water inlet area, and the renal pelvic pressure will not be too high, and the field of view is clear.
[0027] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims
1. An instant and controllable negative pressure suction sheath, characterized in that: The invention comprises a sheath tube joint (1), a negative pressure joint (2) arranged on the side wall of the sheath tube joint (1), and a sheath tube (3) coaxially connected to the sheath tube joint (1); a negative pressure interface is arranged on the side wall of the sheath tube joint (1), and the negative pressure joint (2) is connected to the negative pressure interface; the sheath tube (3) comprises a first straight tube (31) connected to the sheath tube joint (1), a tapered tube (32) connected to the end of the first straight tube (31), and a second straight tube (33) connected to the end of the tapered tube (32); a stone discharge hole (34) for controlling the negative pressure is arranged on the first straight tube (31), and the distance between the stone discharge hole (34) and the end of the second straight tube (33) is 10-12 cm; the negative pressure at the end of the second straight tube is adjusted and controlled by the stone discharge hole (34).
2. The instant controllable negative pressure suction sheath according to claim 1, characterized in that: The stone removal hole (34) is an elliptical through hole.
3. The instant controllable negative pressure suction sheath according to claim 2, characterized in that: The diameter of the stone removal hole (34) is 6 mm.
4. The instant controllable negative pressure suction sheath according to claim 1, characterized in that: The length of the second straight tube (33) is 5 cm.
5. The instant controllable negative pressure suction sheath according to claim 1, characterized in that: The outer diameter of the sheath tube connector (1) is greater than the outer diameter of the first straight tube (31); the outer diameter of the first straight tube (31) is greater than the outer diameter of the second straight tube (33); the outer diameter of the front end of the tapered tube (32) is the same as the outer diameter of the first straight tube (31), and the outer diameter of the rear end of the tapered tube (32) is the same as the outer diameter of the second straight tube (33).
6. The instant controllable negative pressure suction sheath according to claim 5, characterized in that: The center point of the sheath tube joint (1), the center point of the first straight tube (31), the center point of the tapered tube (32) and the center point of the second straight tube (33) are on the same straight line.
7. The instant controllable negative pressure suction sheath according to claim 6, characterized in that: The sheath tube (3) is an integrally formed structure.
8. The instant controllable negative pressure suction sheath according to claim 1, characterized in that: The outer surface of the sheath tube (3) is attached with a PAM hydrophilic coating.
9. The instant controllable negative pressure suction sheath according to claim 7, characterized in that: A PTFE hydrophobic coating is attached to the inner cavity wall of the sheath tube (3).