Disposable double lumen ureteral catheter

Abstract

The present invention discloses a disposable double-lumen ureteral catheter, which belongs to the technical field of ureteral catheters. Two independent channels are arranged in the axial direction inside the catheter, and the characteristics are as follows: the channels are respectively a water inlet channel and a water outlet channel, and the end of the ureteral catheter is externally connected with a water inlet catheter and a water outlet catheter, the water inlet catheter is communicated with the water inlet channel, the water outlet catheter is communicated with the water outlet channel, a water inlet joint is arranged at the end of the water inlet catheter, and the water outlet catheter is used to discharge the gravel or water in the renal pelvis. The double-lumen ureteral catheter of the present invention can be used in conjunction with a percutaneous renal guide sheath, which is conducive to the discharge of water and stones. The pressure measuring catheter can detect the pressure in the renal pelvis in real time and can drain and relieve pressure, so as to realize the low-pressure continuous water circulation of the renal pelvis during the operation, making the operation simpler and safer.

Description

Technical Field

[0001] The invention belongs to the technical field of ureteral catheters, and in particular relates to a disposable double-lumen ureteral catheter. Background Art

[0002] With the improvement and perfection of X-ray, B-ultrasound, and CT positioning puncture positioning technology, and the improvement of lithotripsy equipment, the accuracy of puncture is getting higher and higher, and surgical complications are getting fewer and fewer, so percutaneous nephrolithotomy is being carried out more and more widely. The development of minimally invasive vascular interventional surgery provides safety protection for percutaneous nephrolithotomy, and most kidney stone surgeries are solved through percutaneous nephrolithotomy. The proportion of open surgery is also decreasing. The ureter, a natural cavity, is traditionally given a single-channel ureteral catheter before puncture during percutaneous nephrolithotomy. It is used as a water injection to create artificial hydronephrosis and puncture positioning. During percutaneous nephrolithotomy, a saline solution is hung as an auxiliary water entry channel. However, ureteral flexible nephrolithotomy has proved that larger diameter catheters can be inserted into the ureter. Now there are many improvements on the percutaneous renal channel sheath for detecting intraoperative renal pelvic pressure. The pressure measuring channel sheath must increase the diameter of the renal channel sheath, and the pressure measuring device of the renal channel sheath with pressure measurement will cause interference and inconvenience to the surgeon during the operation, so it is not widely used clinically.

[0003] Since all percutaneous renal surgeries require the placement of a ureteral catheter, traditional ureteral catheters are mostly single-channel and cannot provide auxiliary pressure relief, drainage, and lithotripsy functions. Therefore, the internal pressure of the renal pelvis cannot be reduced in time, and an additional pressure measuring channel sheath needs to be matched, which is not conducive to the safety of surgical operations, and the operation process is cumbersome and inconvenient. Summary of the invention

[0004] The purpose of the present invention is to provide a disposable double-lumen ureteral catheter, which solves the technical problem that the traditional ureteral catheter can only be used for water injection and cannot automatically release pressure and drain water when the renal pelvis pressure exceeds the safe range, making the operation not simple and safe.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A disposable double-lumen ureteral catheter, wherein two independent channels are arranged inside the catheter along the axial direction, and the characteristics are that: the channels are respectively a water inlet channel and a water outlet channel, the end of the ureteral catheter is externally connected with a water inlet catheter and a water outlet catheter, the water inlet catheter is communicated with the water inlet channel, the water outlet catheter is communicated with the water outlet channel, a water inlet joint is arranged at the end of the water inlet catheter, and the water outlet catheter is used to discharge stones or water in the renal pelvis.

[0007] Furthermore, a water outlet joint is provided at the end of the water outlet conduit.

[0008] Furthermore, the water outlet joint is connected to a pressure measuring catheter, and the pressure measuring catheter is provided with a scale for detecting the pressure in the renal pelvis.

[0009] Furthermore, the end of the water outlet conduit is connected to a pressure measuring conduit, the pressure measuring conduit is provided with a scale for detecting the pressure in the renal pelvis, and the water outlet conduit and the pressure measuring conduit are integrally formed.

[0010] Furthermore, the rear section of the pressure measuring tube is provided with an exhaust port, and the side of the pressure measuring tube is connected to a pressure relief drain port.

[0011] Furthermore, the pressure relief drain port is connected to a drainage bag.

[0012] Furthermore, a pipe clamping device is provided at the front section of the pressure measuring tube for controlling the on-off of the pressure measuring tube.

[0013] Furthermore, the ureteral catheter is a double-channel reducer catheter, and the diameter of the end of the double-channel reducer catheter is larger than the diameter of the front end.

[0014] Furthermore, an overflow hole is provided at the front end side of the ureteral catheter, and the overflow hole is separately connected to the water inlet channel and the water outlet channel.

[0015] Furthermore, the front section of the ureteral catheter is a J-shaped tube head.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The disposable double-lumen ureteral catheter of the present invention adopts a dual-channel design, so that the ureteral catheter has the functions of both water injection and drainage, without the need to use a pressure measuring channel sheath with an enlarged diameter, thereby avoiding the increase in the diameter of the renal channel, which leads to increased renal parenchymal damage and an increased chance of postoperative bleeding, making the surgical operation simpler and safer.

[0018] (2) The disposable double-lumen ureteral catheter of the present invention has one lumen for artificial hydronephrosis positioning before puncture, and can also be used as an auxiliary water inlet channel during surgery, which is similar to the function of the original indwelling ureteral catheter. The other lumen is a manometric catheter with a scale and an exhaust hole and a pressure relief outlet outside the body, which can detect the renal pelvic pressure in real time during surgery, and automatically drain water when the pressure in the renal pelvis is too high to reduce the pressure in the renal pelvis, so as to achieve low-pressure continuous water circulation in the renal pelvis during surgery, making the surgery simpler and safer. In addition, during surgery, the transparent manometric catheter is vertically tied to the infusion water inlet pipe, which is convenient for observation and has little impact on the operation of the surgeon.

[0019] (3) The disposable double-lumen ureteral catheter of the present invention replaces the traditional ureteral catheter with a double-lumen ureteral catheter or a double-lumen ureteral catheter with a single J tube through a variable diameter design. Even if the lumen is doubled, it can be easily placed. Since the diameter of the tube gradually increases from the front end to the rear end, the head and the side parts nearby are provided with overflow holes, which are independently connected to the water inlet channel and the water outlet channel, respectively, so that the tube diameter is more unobstructed, the pressure measurement during the operation is more accurate, and the water inlet and outlet are more unobstructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the disposable double-lumen ureteral catheter of the present invention.

[0021] Figure 2 The figure is a schematic cross-sectional view of the variable diameter structure of the disposable double-lumen ureteral catheter of the present invention.

[0022] Figure 3 The figure is a schematic structural diagram of a disposable double-lumen ureteral catheter with a J-shaped tube head according to the present invention.

[0023] Figure 4 The figure is a cross-sectional schematic diagram of a disposable double-lumen ureteral catheter with a J-shaped tube head with a variable diameter structure according to the present invention.

[0024] Figure 5 The figure is a schematic diagram of the working principle of the disposable double-lumen ureteral catheter of the present invention used in conjunction with the percutaneous renal guide sheath.

[0025] Markings in the figure: 10, ureteral catheter; 11, water inlet channel; 12, water outlet channel; 13, fixed joint; 20, water inlet catheter; 201, water inlet joint; 21, water outlet catheter; 211, water outlet joint; 22, pressure measuring catheter; 221, exhaust port; 222, pressure relief drain port; 23, pipe clamping device; 24, J-type pipe head; 241, overflow hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] See also Figure 1-4 The present invention provides a disposable double-lumen ureteral catheter. The ureteral catheter 10 is a double-channel catheter. The ends of the ureteral catheter 10 are respectively connected with a water inlet catheter 20 and a water outlet catheter 21 that communicate and match the double channels.

[0029] In this embodiment, a water inlet joint 201 may be provided at the end of the water inlet conduit 20, which may be a reed joint or other joint with a plugging structure. The water joint 201 is used to connect an external syringe to inject saline to create artificial hydronephrosis. The water outlet conduit 21 can be provided to discharge water and pressure, and is used to discharge the gravel or water in the renal pelvis, so as to achieve low-pressure continuous water circulation in the renal pelvis during the operation, making the operation simpler and safer.

[0030] Specifically, the ureteral catheter 10 is provided with an independent water inlet channel 11 and a water outlet channel 12 along the axial direction, and the end of the ureteral catheter 10 is externally connected with a water inlet catheter 20 and a water outlet catheter 21, wherein the water inlet catheter 20 is in communication with the water inlet channel 11, and the water outlet catheter 21 is in communication with the water outlet channel 12. A water outlet connector 211 may be provided at the end of the water outlet catheter 21 for connecting with other catheters or surgical consumables.

[0031] Preferably, a fixed joint 13 is provided at the connection between the end of the ureteral catheter 10 and the water inlet catheter 20 and the water outlet catheter 21, which is used to lock the water inlet catheter 20 and the water outlet catheter 21 to prevent the water inlet catheter 20 and the water outlet catheter 21 from being pulled apart during use, causing the end of the ureteral catheter 10 to be torn or broken.

[0032] In an embodiment of the present invention, the end of the water outlet conduit 21 may be connected to a pressure measuring conduit 22, and a scale for detecting the pressure in the renal pelvis is provided on the pressure measuring conduit 22. The water outlet conduit 21 and the pressure measuring conduit 22 may be integrally formed, or may be detachably connected using a water outlet connector 211. The pressure measuring conduit 22 is made of a transparent material, which is convenient for doctors to measure and observe pressure during surgery.

[0033] See also Figure 1 , 3 If the pressure measuring catheter connected to the water outlet channel 12 adopts a split connection, that is, the water outlet catheter 21 at the end of the water outlet channel 12 is only used as a branch pipe for transfer, and its end is connected with a water outlet joint 211, which can be a reed joint or other joint with a blocking structure. When it is necessary to measure pressure through the ureteral catheter 10, it is only necessary to connect the pressure measuring catheter 22 at the water outlet joint 211 to measure pressure or drain water; when it is not necessary to measure pressure through the ureteral catheter 10, it is only necessary to close the water outlet joint 211; or when the water outlet catheter needs to be connected to other catheters for other purposes, it is only necessary to transfer through the water outlet joint 211. Such a split design can realize the multi-purpose operation and detachable replacement of the ureteral catheter 10 and its matching catheters.

[0034] In other embodiments, Figure 2 , 4As shown, if the pressure measuring tube 22 and the water outlet tube 21 are designed in an integrated manner, a pipe clamping device 23 is provided at the front section of the pressure measuring tube 22 to control the on and off of the water outlet tube 21. The pipe clamping device 23 in this embodiment is a common flow rate regulator or a tube stop clamp in the field of medical tubes, which will not be described in detail here. Of course, in the case of a split connection, a pipe clamping device 23 can also be provided between the pressure measuring tube 22 and the water outlet tube 21.

[0035] In this embodiment, an exhaust port 221 is provided at the rear section of the pressure measuring catheter 22, and the exhaust port 221 is located behind the maximum scale value, and can be at the end or side of the water outlet catheter 21. A pressure relief drain port 222 is provided on one side within the scale area on the water outlet catheter 21, and a drainage bag (not shown in the figure) is detachably connected to the pressure relief drain port 222. Once the pressure in the renal pelvis is too high, the water flow will automatically drain out from the water outlet catheter 21 until it exceeds a certain pressure threshold, and the water flow will be discharged from the pressure relief drain port 222 and collected in the drainage bag, thereby ensuring that the renal pelvis is in a low-pressure state during the operation, ensuring the safety of the operation and the patient.

[0036] Before the lithotripsy operation, the pressure measuring tube is first clamped by the pipe clamping device 23, so that the water outlet catheter 21 blocks the flow, and then the water inlet catheter 20 adapted to the connection of the dual-channel ureteral catheter 10 is used to inject physiological saline with a syringe to create an artificial hydronephrosis state. After the puncture is completed and before the lithotripsy is ready, the pipe clamping device 23 is opened again, and then the lithotripsy is performed. Water is introduced from the water inlet catheter 20 and the percutaneous renal guide sheath respectively, and drives the stones to be discharged. At this time, water flows in the water outlet catheter 21, and the current renal pelvic pressure value can be read through the scale value on the rear section of the pressure measuring catheter 22. When the pressure value is too large and exceeds a certain threshold, automatic pressure relief and drainage can be achieved through the pressure relief drainage port 222.

[0037] In this embodiment, the pressure threshold range for the setting position of the pressure relief drain port 222 is 15-35cmH2O, and the scale range on the actual pressure measuring catheter 22 should exceed the upper part of the pressure relief drain port 222 and be as close to the exhaust port 221 as possible. Due to the change in the setting position of the pressure relief drain port 222, different pressure thresholds can be matched, so in actual surgery, the pressure measuring catheter 22 corresponding to different threshold models can be selected according to the patient's condition and physical condition. In addition, the water inlet catheter 20, the water outlet catheter 21, the pressure measuring catheter 22 and the ureteral catheter 10 can be integrally formed, or they can be separated and detachably connected.

[0038] In some other embodiments, such as Figure 3 A J-shaped tube head 24 is integrally connected to the head of the ureteral catheter 10, that is, the front section of the ureteral catheter 10 as a whole is the J-shaped tube head 24, forming an integrated double-channel ureteral single J tube, which is convenient for positioning the ureteral catheter in the renal pelvis.

[0039] Example 2

[0040] See also Figure 2 The ureteral catheter 10 of the present invention adopts a double-channel variable diameter ureteral catheter, that is, the diameter of the end of the ureteral catheter 10 is larger than the diameter of the front end. Even if the ureteral catheter 10 adopts a double-channel structure, its outer diameter will be slightly increased, but because the front end of the double-channel variable diameter ureteral catheter is thinner, it is convenient to advance the implantation into the ureter. An overflow hole 241 is opened on the side of the front end of the ureteral catheter 10, and the overflow hole 241 is separately connected to the water inlet channel 11 and the water outlet channel 12, so as to improve the transport efficiency of water in and out.

[0041] See also Figure 4 In other embodiments of the disposable double-lumen ureteral catheter provided by the present invention, the ureteral catheter 10 can also adopt an integrated double-channel variable-diameter ureteral single J tube, that is, a J-shaped tube head 24 is integrally connected at the short-diameter end of the head of the double-channel variable-diameter ureteral catheter (equivalent to the front section of the ureteral catheter 10 as a whole being the J-shaped tube head 24), and a plurality of overflow holes 241 are opened on the side of the J-shaped tube head 24. The water inlet channel 11 and the water outlet channel 12 extend all the way to the front end of the J-shaped tube head 24, and the overflow holes 241 are separately connected to the water inlet channel 11 and the water outlet channel 12. The tail long-diameter end of the double-channel variable-diameter ureteral catheter is respectively connected to the water inlet catheter 20 and the water outlet catheter 21, wherein the water inlet channel 11 is connected to the water inlet catheter 20, and the water outlet channel 12 is connected to the water outlet catheter 21. The diameter of the dual-channel variable diameter conduit gradually increases from the front end to the rear end, which can meet the needs of rapid water injection. At the same time, multiple overflow holes 241 are set at the front end to speed up the water flow rate at the end of the J-shaped pipe head 24, thereby improving the flushing efficiency and the speed of reflux drainage.

[0042] In this embodiment, a plurality of overflow holes 241 are evenly arranged on the side of the J-shaped tube head 24, which serve as water inlets and pressure measuring outlets, so as to quickly and evenly flush gravel and other substances in the body and measure pressure; the end of the J-shaped tube head 24 is a pointed round hole, so that it is easier to pass through the inner section of the ureter and bladder wall when passing the guide wire for placement.

[0043] In other embodiments, the front end of the integrated single-J ureteral catheter 10 (i.e., the head of the J-shaped tube head 24) is conically closed, with a catheter body cavity provided inside. The end of the water inlet catheter 20 has a guide wire with a circular handle, and the guide wire passes through the water inlet channel 11 to support the dual-channel ureteral catheter 10 that can measure and adjust pressure.

[0044] See also Figure 1-5 The specific working principle of the disposable percutaneous renal guide kit of the present invention in actual use is:

[0045] like Figure 5As shown, when the disposable double-lumen ureteral catheter of the present invention is used in surgery, the double-channel ureteral catheter or double-lumen ureteral single J tube is first placed into the renal pelvis through the urethra, bladder, and ureter under a ureteroscope in the lithotomy position through a guide wire and then fixed (if it is a double-channel ureteral catheter with a conical tip or a double-lumen ureteral single J tube, it is directly placed through the guide wire in the water channel). Then change to prone position, use the pipe clamping device 23 at the connection between the pressure measuring catheter 22 and the extracorporeal double-lumen tube to clamp the pressure measuring catheter 22 first, use the reed joint adapted at the connection of the end of the water inlet catheter 20 to inject water with a syringe to create artificial hydronephrosis, after successful puncture under B-ultrasound positioning, insert a hard J-type guide wire, and on the basis of following the principle of "better shallow than deep", expand the J-type guide wire with an expansion core to the size of the adapted renal channel sheath, then smoothly insert the percutaneous renal guide sheath into the renal calyx and renal pelvis, then insert the nephroscope into the guide sheath, before starting lithotripsy, release the clamping device 23 on the pressure measuring catheter 22, connect the water inlet catheter 20 to the infusion strap and drip physiological saline into it as an auxiliary water inlet channel 11, the height of which is 40-50cmH2O, fix the transparent pressure measuring catheter 22 with a pressure measuring scale at the appropriate position of the infusion strap with a pipe fixture, make the transparent water outlet catheter 21 vertical to the position of the patient's kidney, and then start lithotripsy.

[0046] During the operation, most of the water and gravel will flow out from the percutaneous renal introducer sheath, and at the same time, a part of the water in the renal pelvis will enter the water outlet channel 12 perpendicular to the kidney. The water outlet channel 12 with a scale can monitor the pressure in the renal pelvis in real time during the operation. When the pressure in the renal pelvis is greater than 30cmH2O, the water column in the water outlet catheter 21 exceeds the drain port 222 on the water outlet catheter 21, and the water automatically flows into the drainage bag connected to the drain port 222. At the same time, as the water is discharged, the pressure in the renal pelvis automatically decreases.

[0047] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A disposable double-lumen ureteral catheter, wherein two independent channels are arranged in the axial direction inside the catheter, characterized in that: The channels are respectively a water inlet channel and a water outlet channel. The end of the ureteral catheter is externally connected with a water inlet catheter and a water outlet catheter. The water inlet catheter is communicated with the water inlet channel, and the water outlet catheter is communicated with the water outlet channel. A water inlet joint is provided at the end of the water inlet catheter, and the water outlet catheter is used to discharge the gravel or water in the renal pelvis. The end of the water outlet conduit is provided with a water outlet joint; The water outlet joint is connected to a pressure measuring catheter, and the pressure measuring catheter is provided with a scale for detecting the pressure in the renal pelvis; The rear section of the pressure measuring conduit is provided with an exhaust port, and the side of the pressure measuring conduit is connected with a pressure relief drain port; The ureteral catheter is a double-channel reducer catheter, and the diameter of the end of the double-channel reducer catheter is larger than the diameter of the front end.

2. The disposable double-lumen ureteral catheter according to claim 1, characterized in that: The pressure relief drain port is connected with a drainage bag.

3. The disposable double-lumen ureteral catheter according to claim 1, characterized in that: The front section of the pressure measuring tube is provided with a pipeline clamping device for controlling the on and off of the pressure measuring tube.

4. The disposable double-lumen ureteral catheter according to claim 1, characterized in that: An overflow hole is provided on the front end side of the ureteral catheter, and the overflow hole is separately communicated with the water inlet channel and the water outlet channel.

5. The disposable double-lumen ureteral catheter according to claim 1 or 4, characterized in that: The front section of the ureteral catheter is a J-shaped tube head.

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