Ureteral catheter for use in percutaneous nephrolithotomy

Abstract

A ureteral catheter for use in percutaneous nephrolithotomy, the ureteral catheter comprising a balloon catheter, an inner tube (3), an infusion channel (4) and a connecting portion (5), wherein the balloon catheter comprises a hollow outer tube (1) and a balloon (2), the balloon (2) being configured to occlude the ureteropelvic junction after being inflated; the inner tube (3) is hollow and is configured to inject fluid into the renal pelvis; the inner tube (3) passes through the interior of the balloon catheter; the infusion channel (4) is formed between the outer tube (1) and the inner tube (3), and the infusion channel (4) is configured to inflate the balloon (2); the connecting portion (5) is detachably connected to the outer tube (1) and the inner tube (3); when the connecting portion (5) is removed, a cystoscope is withdrawn; and the connecting portion (5) is also configured to connect to an external syringe that is configured to inject fluid into the inner tube (3) and / or the infusion channel (4). The ureteral catheter can not only form artificial hydronephrosis, but also occlude the ureteropelvic junction to prevent stone migration. Moreover, the connecting portion (5) at the rear end of the ureteral catheter is detachable, so that by removing the connecting portion (5) prior to turning the patient to the prone position, the cystoscope can be withdrawn promptly.

Description

A ureteral catheter used in percutaneous nephrolithotomy Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a ureteral catheter used in percutaneous nephroscopy. Background Technology

[0002] Percutaneous nephrolithotomy (PCNL) is an important part of endourological surgery. In the treatment of upper urinary tract stones, it, along with ureteroscopy and extracorporeal shock wave lithotripsy (ESWL), has become a major modern treatment method, fundamentally changing the traditional surgical approach of open surgery. Through a comprehensive approach combining PCNL, ureteroscopic lithotripsy, and ESWL, more than 90% of kidney stones can be treated without open surgery.

[0003] However, existing technologies have the following drawbacks: during lithotripsy, stones in the renal pelvis can easily migrate into the ureter, resulting in incomplete stone removal; stones that have entered the ureter need to be expelled by the patient on their own. Furthermore, cystoscopy is required when inserting fluid into the ureteral catheter.

[0004] Authorization Announcement No.: CN 204932536 U, Application Date: 2015.03.31, Utility Model Name: Ureteral Catheter Assembly. This utility model relates to a ureteral catheter assembly, including: a ureteral catheter; and a pressure measuring mechanism connected to the ureteral catheter for measuring the water pressure within the ureteral catheter. Compared with the prior art, this technical solution has the following advantages: In percutaneous nephrolithotomy, the ureteral catheter is connected to the renal pelvis, and the pressure measuring mechanism can measure the intrarenal pelvis pressure in real time. Based on the real-time measured intrarenal pelvis pressure, it can be determined whether the intrarenal pelvis pressure is within the allowable range. If the intrarenal pelvis pressure exceeds the allowable range, the amount of water injected into the renal pelvis through the nephroscope and the amount of water drained from the renal pelvis through the nephroscope and external sheath can be adjusted according to the intrarenal pelvis pressure to maintain the balance between the intrarenal pelvis pressure and the external pressure. This can avoid the problem of excessive intrarenal pelvis pressure and effectively prevent kidney damage and other harms caused by excessive intrarenal pelvis pressure.

[0005] The aforementioned existing technology uses a ureteral catheter that only has an infusion function, which cannot prevent the risk of stones in the renal pelvis moving into the ureter. In addition, the infusion process needs to be performed while the patient is in a supine position.

[0006] Utility Model Content

[0007] In view of the shortcomings of existing ureteral catheters, such as only having an infusion function, being unable to prevent stones in the renal pelvis from moving down to the ureter, and requiring the infusion to be performed when the patient is in a supine position, the purpose of this utility model is to provide a ureteral catheter for percutaneous nephrolithotomy.

[0008] The technical solution provided by this utility model is as follows:

[0009] A ureteral catheter for use in percutaneous nephrolithotomy, comprising,

[0010] A balloon catheter, comprising a hollow outer tube and a balloon sealed to the front end of the outer tube, wherein the balloon, after expansion, is used to seal the junction of the renal pelvis and ureter.

[0011] The inner tube is hollow and used for injecting fluid into the renal pelvis; the inner tube is inserted inside the balloon catheter and is approximately coaxial with the balloon catheter.

[0012] The outer tube and the inner tube are provided with a gap, which forms a fluid injection channel for expanding the balloon;

[0013] A connecting part, which has an internal channel for the outer tube and the inner tube to pass through, and the connecting part is detachably connected to the outer tube and the inner tube;

[0014] When the connector is removed, the cystoscope is withdrawn; the connector is also used to connect to an external syringe for injecting fluid into the inner tube and / or injection channel.

[0015] Furthermore, the internal channel of the connecting part is in clearance fit with the outer tube and the inner tube; both ends of the inner tube extend out of the connecting part, and the front end of the outer tube extends out of the connecting part.

[0016] Furthermore, the connecting portion includes,

[0017] A first interface is used to connect to an external infusion set for injecting liquid into the inner tube.

[0018] The second interface, located above the outer tube, is used to connect to an external injection syringe for injecting liquid into the injection channel.

[0019] Furthermore, the connection part also includes a third interface for the outer tube and the inner tube to pass through. The inner wall of the third interface and the outer wall of the outer tube are provided with an interference fit second sealing plug, which is used to prevent liquid from overflowing from the injection channel.

[0020] Furthermore, an interference fit first sealing plug is provided between the inner wall of the first interface and the inner tube, the first sealing plug being used to prevent liquid from overflowing in the injection channel.

[0021] Furthermore, the inner tube includes an inner tube body and a front flexible head that is sealed and connected to the front end of the inner tube body. The inner tube body extends out of the outer tube, and the front flexible head is used to guide the inner tube body into the ureter. The front flexible head has several outlet holes at its front end.

[0022] Furthermore, the balloon is provided with a first opening and a second opening opposite to the first opening;

[0023] The front end of the outer tube is sealed to the first opening;

[0024] The rear end of the front soft tip is sealed to the second opening;

[0025] The injection channel is connected to the inner cavity of the balloon.

[0026] Furthermore, the front end of the inner tube body extends out of the second opening; the soft tip at the front end, located between the second opening and the inner tube body, is used to seal the inner cavity of the balloon.

[0027] Furthermore, the length of the sealing connection section between the inner tube body and the front soft head is not less than 2mm.

[0028] Furthermore, the balloon, after expansion, is approximately spherical and is made of silicone.

[0029] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0030] This invention has a dual function: it can not only create artificial hydronephrosis but also seal the connection between the renal pelvis and ureter to prevent stones from moving downwards. Simultaneously, the connector at the rear end of the ureteral catheter is detachable; it can be removed before the patient is turned into a prone position, allowing for timely removal of the cystoscope.

[0031] In addition, the detachable connection has the advantage that there is no need to rely on the injection port on the cystoscope. After the cystoscope is withdrawn, the fluid can be injected as needed for the surgery, regardless of whether the patient is in a supine or prone position. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the overall appearance of the ureteral catheter in one embodiment of this application;

[0033] Figure 2 is a cross-sectional view of a ureteral catheter in one embodiment of this application;

[0034] Figure 3 is a cross-sectional view of the connecting part structure in one embodiment of this application;

[0035] Figure 4 is a schematic diagram of the balloon structure after inflation in one embodiment of this application.

[0036] The labels in the diagram are as follows: Outer tube 1; Balloon 2, First opening 21, Second opening 22; Inner tube 3, Inner tube body 31, Front soft tip 32; Injection channel 4; Connecting part 5, First interface 51, Second interface 52, Third interface 53, First sealing plug 511, Second sealing plug 531. Detailed Implementation

[0037] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0038] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0039] To perform percutaneous nephrolithotomy, a ureteral catheter needs to be inserted first to create artificial hydronephrosis. The ureteral catheter is inserted through the urethra into the ureter and finally reaches the renal pelvis. Normal saline is dripped in from an external infusion set to create artificial hydronephrosis, which is more conducive to establishing a channel for artificial puncture percutaneous kidney.

[0040] During the procedure, the patient first lies supine, and a ureteral catheter is inserted into the ureter on the affected side using a cystoscope. After the external infusion set is connected to the ureteral catheter, normal saline or contrast agent is injected into the kidney.

[0041] The patient is turned into a prone position. The lumbar surgical area is disinfected and a disposable sterile surgical dressing is applied. Under ultrasound guidance, a suitable location is selected between the posterior axillary line and the scapular line for puncture. After the puncture needle enters the renal pelvis, the stylet is removed. The appearance of urine indicates a successful puncture. The puncture channel is gradually dilated, and then a guidewire is inserted into the kidney through the puncture needle sheath. A percutaneous nephrolithotomy scope is inserted along the guidewire to observe the stones. Stones are then fragmented using a pneumatic ballistic lithotripter, holmium laser, or ultrasonic lithotripter via the percutaneous nephrolithotomy scope.

[0042] Current ureters typically only have the function of injecting fluid into the kidney, i.e., they only have the function of creating artificial hydronephrosis. During percutaneous nephrolithotomy, if the stone is large, small stones may move down into the ureter during the lithotripsy process. If the patient cannot pass them on their own, it may cause urinary tract infection or urinary tract obstruction.

[0043] This application discloses a ureteral catheter for percutaneous nephrolithotomy, which has a dual function: it can not only create artificial hydronephrosis but also seal the junction of the renal pelvis and ureter to prevent stone displacement. Simultaneously, the connector at the rear end of the ureteral catheter is detachable; it can be removed before the patient is turned into a prone position, allowing for immediate removal of the cystoscope. It should be noted that, in this design, the rear end refers to the side closer to the operator, while the front end is the side that first enters the body.

[0044] This application discloses a ureteral catheter for percutaneous nephrolithotomy, comprising a balloon catheter, an inner tube 3, an injection channel 4, and a connecting portion 5.

[0045] The balloon catheter consists of a hollow outer tube 1 and a balloon 2, with the balloon 2 sealed to the front end of the outer tube 1. After inflation, the balloon 2 is used to seal the junction of the renal pelvis and ureter. The inner tube 3 is hollow and used to inject fluid into the renal pelvis. The inner tube 3 passes through the inside of the balloon catheter and is approximately coaxial with the balloon catheter.

[0046] A gap is provided between the outer wall of the inner tube 3 and the inner wall of the outer tube 1, which naturally forms an injection channel 4. The injection channel 4 is connected to the inner cavity of the balloon 2, and the liquid flows into the inner cavity of the balloon through the injection channel 4, thereby expanding the balloon.

[0047] The connecting part 5 has an internal channel through which the outer tube 1 and the inner tube 3 pass. The inner tube 3 extends from both ends of the connecting part 5, and the connecting part 5 is detachably connected to the outer tube 1 and the inner tube 3. When the connecting part 5 is removed, the cystoscope is withdrawn. When the connecting part 5 is connected to the outer tube 1 and the inner tube 3, an external syringe is connected to the connecting part 5, and liquid is injected into the inner tube 3 and / or the injection channel 4 through the external syringe. Injecting liquid into the inner tube 3 creates artificial hydronephrosis, and injecting liquid into the injection channel 4 dilates the balloon 2. The ureteral catheter of this application has dual channels, each performing a different function.

[0048] The advantage of the detachable connector 5 is that it eliminates the need for the injection port on the cystoscope; the rigid cystoscope only requires the insertion of a flexible ureteral catheter. Existing technology requires the injection of artificial kidney fluid before the cystoscope is withdrawn. However, due to the detachable connector 5 in this application, fluid can be injected as needed after the cystoscope is withdrawn.

[0049] For example, when a balloon catheter is not needed in the early stages of percutaneous nephrolithotomy, i.e., when it is not necessary to block the connection between the renal pelvis and the ureter, liquid can be injected into the inner tube 3 through one injection port of the connecting part 5. If it is found during the operation that it is necessary to temporarily block the renal pelvis, liquid can be injected into the injection channel 4 through another injection port of the connecting part 5 to dilate the balloon.

[0050] Furthermore, existing techniques require the patient to be in a supine position when injecting fluid into the kidney using a cystoscope; however, the technical solution of this application does not have this limitation.

[0051] More specifically, the connecting part 5 includes a first interface 51, a second interface 52, and a third interface 53. The first interface 51 is used to connect to an external infusion set for injecting liquid into the inner tube 3; the second interface 52 is located above the outer tube 1 and is used to connect to an external injection syringe for injecting liquid into the injection channel 4; the third interface 53 is opposite to the first interface 51 and is used for the outer tube 1 and the inner tube 3 to pass through. Preferably, the second interface 52 is located between the first interface 51 and the third interface 53, and the second interface 52 is located on the side of the connecting part 5.

[0052] A first sealing plug 511 with an interference fit is provided between the inner wall of the first interface 51 and the inner tube 3. The first sealing plug 511 is used to prevent the liquid in the injection channel 4 from overflowing. A second sealing plug 531 with an interference fit is provided between the inner wall of the third interface 53 and the outer wall of the outer tube 1. The second sealing plug 531 is used to prevent the liquid in the injection channel 4 from overflowing.

[0053] More specifically, the inner tube 3 includes an inner tube body 31 and a front flexible head 32 that is sealed to the front end of the inner tube body 31. Preferably, the front flexible head 32 is sealed to the outside of the inner tube body 31, with a sealing section of not less than 2 mm. The front flexible head 32 is used to guide the inner tube body 31 into the ureter. The front end of the front flexible head 32 is provided with several drainage holes. It should be noted that the drainage holes are far away from the sealing section between the front flexible head 32 and the inner tube body 31.

[0054] The inner tube body 31 extends out of the outer tube 1. The balloon 2 has a pair of openings. The first opening 21 is sealed to the front end of the outer tube 1, and the second opening 22, which is opposite to the first opening 21, is sealed to the rear end of the front soft tip 32. The injection channel 4 communicates with the inner cavity of the balloon 2. To better ensure the sealing effect, the front end of the inner tube body 31 extends out of the second opening 22.

[0055] The front soft head 32, located between the second opening 22 and the inner tube body 31, blocks the balloon 2. After expansion, the balloon 2 is roughly spherical and is made of silicone.

[0056] This technical solution can also be adjusted according to the needs of the surgery. By adjusting the amount of liquid injected into balloon 2, balloon 2 can not completely block the connection between the renal pelvis and the ureter, thus avoiding excessive pressure in the kidney. However, the size of the gap left is smaller than the size of the stone, so the stone will still not move down into the ureter.

[0057] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A ureteral catheter for use in percutaneous nephrolithotomy, characterized in that: include, A balloon catheter, comprising a hollow outer tube (1) and a balloon (2) sealed to the front end of the outer tube (1), wherein the balloon (2) is used to seal the connection between the renal pelvis and the ureter after expansion; Inner tube (3), which is hollow and used to inject liquid into the renal pelvis; the inner tube (3) is inserted inside the balloon catheter and is approximately coaxial with the balloon catheter; The injection channel (4) is provided between the outer tube (1) and the inner tube (3), and the gap forms the injection channel (4), which is used to expand the balloon (2); The connecting part (5) has an internal channel through which the outer tube (1) and the inner tube (3) pass. The connecting part (5) is detachably connected to the outer tube (1) and the inner tube (3). When the connector (5) is removed, the cystoscope is withdrawn; the connector (5) is also used to connect to an external syringe, which is used to inject liquid into the inner tube (3) and / or the injection channel (4).

2. The ureteral catheter for percutaneous nephrolithotomy according to claim 1, characterized in that: The internal channel of the connecting part (5) is fitted with the outer tube (1) and the inner tube (3) with a clearance; both ends of the inner tube (3) extend out of the connecting part (5), and the front end of the outer tube (1) extends out of the connecting part (5).

3. The ureteral catheter for percutaneous nephrolithotomy according to claim 1, characterized in that: The connecting part (5) includes, A first interface (51) is used to connect to an external infusion set for injecting liquid into the inner tube (3); The second interface (52) is located above the outer tube (1) and is used to connect to an external injection syringe for injecting liquid into the injection channel (4).

4. A ureteral catheter for percutaneous nephrolithotomy according to claim 3, characterized in that: The connecting part (5) further includes a third interface (53), which is used for the outer tube (1) and the inner tube (3) to pass through. The inner wall of the third interface (53) and the outer wall of the outer tube (1) are provided with an interference fit second sealing plug (531), which is used to prevent liquid from overflowing from the injection channel (4).

5. A ureteral catheter for percutaneous nephrolithotomy according to claim 1, characterized in that: The inner wall of the first interface (51) is provided with an interference fit first sealing plug (511) between the inner wall and the inner tube (3). The first sealing plug (511) is used to prevent liquid from overflowing in the injection channel (4).

6. A ureteral catheter for percutaneous nephrolithotomy according to claim 1, characterized in that: The inner tube (3) includes an inner tube body (31) and a front flexible head (32) that is sealed to the front end of the inner tube body (31). The inner tube body (31) extends out of the outer tube (1). The front flexible head (32) is used to guide the inner tube body (31) into the ureter. The front flexible head (32) has several outlet holes at its front end.

7. A ureteral catheter for percutaneous nephrolithotomy according to claim 6, characterized in that: The balloon (2) is provided with a first opening (21) and a second opening (22) opposite to the first opening (21); The front end of the outer tube (1) is sealed to the first opening (21); The rear end of the front soft tip (32) is sealed to the second opening (22); The injection channel (4) is connected to the inner cavity of the balloon (2).

8. A ureteral catheter for percutaneous nephrolithotomy according to claim 7, characterized in that: The inner tube body (31) has a second opening (22) extending from its front end; the front soft head (32) located between the second opening (22) and the inner tube body (31) is used to block the inner cavity of the balloon (2).

9. A ureteral catheter for percutaneous nephrolithotomy according to claim 7, characterized in that: The length of the sealing connection section between the inner tube body (31) and the front end soft head (32) is not less than 2mm.

10. A ureteral catheter for percutaneous nephrolithotomy according to claim 1, characterized in that: The balloon (2) is roughly spherical after expansion and is made of silicone.

Images