Ureteral catheter applied to percutaneous nephroscope

Abstract

The ureteral catheter applied to the percutaneous nephroscope comprises a balloon catheter, an inner tube, a liquid injection channel and a connecting part, the balloon catheter comprises a hollow outer tube and a balloon, and the balloon is used for blocking the connecting position of a renal pelvis and a ureter after being expanded; the inner tube is hollow and is used for injecting liquid into the renal pelvis; the inner tube is arranged in the balloon catheter in a penetrating manner; a liquid injection channel is formed between the outer tube and the inner tube and is used for expanding the balloon; the connecting part is detachably connected with the outer pipe and the inner pipe; when the connecting part is taken down, the cystoscope is withdrawn; the connecting part is used for being connected with an external injector, and the external injector is used for injecting liquid into the inner pipe and / or the liquid injection channel. The utility model has double functions, not only can artificial hydronephrosis be formed, but also the joint of the renal pelvis and the ureter can be blocked, and calculi can be prevented from moving downwards. Meanwhile, the connecting part at the rear end of the ureteral catheter is detachable, and the cystoscope can be taken out in time by detaching the connecting part before the patient is turned to the prone position.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a ureteral catheter for percutaneous nephroscope. BACKGROUND

[0002] Percutaneous nephrolithotomy (PCNL) is an important part of endourological surgery, and together with ureteroscopy and extracorporeal shock wave lithotripsy, it has become a major treatment method for upper urinary tract calculi, which has completely changed the traditional surgical treatment method of open surgery. Through the comprehensive treatment methods of percutaneous nephrolithotomy, ureteroscopy and extracorporeal shock wave lithotripsy, more than 90% of kidney stones can be exempted from open surgery.

[0003] However, the existing technology has the following disadvantages: the stones in the renal pelvis are prone to move down into the ureter during the lithotripsy process, the stone removal is not complete, and the stones entering the ureter need to be discharged by the patient. In addition, the ureteral catheter also needs to be assisted by a cystoscope when injecting liquid.

[0004] The utility model discloses a ureteral catheter assembly, which comprises a ureteral catheter, a pressure measuring mechanism connected to the ureteral catheter for measuring the water pressure in the ureteral catheter. Compared with the prior art, the technical scheme has the following advantages: in percutaneous nephrolithotomy surgery, the ureteral catheter is in communication with the renal pelvis, and the pressure measuring mechanism can measure the pressure in the renal pelvis in real time. According to the real-time measured pressure in the renal pelvis, it can be known whether the pressure in the renal pelvis is within the allowable range. If the pressure in the renal pelvis is beyond the allowable range, the water injection amount through the nephroscope to the renal pelvis and the water discharge amount through the nephroscope and the outer sheath tube to the outside can be adjusted according to the pressure in the renal pelvis to maintain the balance between the pressure in the renal pelvis and the external pressure. This can avoid the problem of high pressure in the renal pelvis and effectively prevent the damage to the kidney function caused by high pressure in the renal pelvis.

[0005] The ureteral catheter in the above-mentioned prior art only has the function of injecting liquid, and cannot avoid the risk of the stones in the renal pelvis moving down into the ureter. In addition, the liquid injection process needs to be carried out when the patient is in a supine position. UTILITY MODEL CONTENTS

[0006] In view of the defects of the prior art ureteral catheter, which only has the function of injecting liquid and cannot avoid the movement of the stones in the renal pelvis into the ureter, and the liquid injection needs to be carried out when the patient is in a supine position, the purpose of the utility model is to provide a ureteral catheter for percutaneous nephroscope.

[0007] The technical scheme provided by the utility model is as follows:

[0008] A ureteral catheter for percutaneous nephroscope, comprising,

[0009] A balloon catheter, the balloon catheter comprising a hollow outer tube and a balloon connected to the front end of the outer tube, the balloon being used to block the connection between the renal pelvis and the ureter after being expanded;

[0010] An inner tube, the inner tube being hollow and used to inject liquid into the renal pelvis, the inner tube being arranged inside the balloon catheter and being substantially coaxial with the balloon catheter;

[0011] A liquid injection channel, a gap being formed between the outer tube and the inner tube, the gap forming the liquid injection channel, the liquid injection channel being used to expand the balloon;

[0012] A connecting part, the connecting part having an internal channel for the outer tube and the inner tube to pass through, the connecting part being detachably connected to the outer tube and the inner tube;

[0013] When the connecting part is removed, the cystoscope is withdrawn; the connecting part is also used to connect to an external injector, the external injector being used to inject liquid into the inner tube and / or the liquid injection channel.

[0014] Further, the internal channel of the connecting part cooperates with the gap between 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.

[0015] Further, the connecting part comprises,

[0016] A first interface, the first interface being used to connect to an external infusion device, the external infusion device being used to inject liquid into the inner tube;

[0017] A second interface, the second interface being arranged above the outer tube, the second interface being used to connect to an external injection syringe, the external injection syringe being used to inject liquid into the liquid injection channel.

[0018] Further, the connecting part further comprises a third interface, the third interface being used for the outer tube and the inner tube to pass through, a second sealing plug being arranged between the inner wall of the third interface and the outer wall of the outer tube in an interference fit, the second sealing plug being used to prevent liquid in the liquid injection channel from overflowing.

[0019] Further, a first sealing plug is arranged between the inner wall of the first interface and the inner tube in an interference fit, the first sealing plug being used to prevent liquid in the liquid injection channel from overflowing.

[0020] Further, the inner tube comprises an inner tube body and a front end soft tip connected to the front end of the inner tube body, the inner tube body extending out of the outer tube, the front end soft tip being used to guide the inner tube body into the ureter, a plurality of liquid outlet holes being arranged at the front end of the front end soft tip.

[0021] Further, the balloon is provided with a first opening and a second opening opposite to the first opening;

[0022] The front end of the outer tube is in sealing connection with the first opening.

[0023] The rear end of the front end soft head is in sealing connection with the second opening.

[0024] The liquid injection channel is in communication with the balloon inner cavity.

[0025] Further, the inner tube body front end extends out of the second opening; the front end soft head between the second opening and the inner tube body is used for plugging the inner cavity of the balloon.

[0026] Further, the sealing connection length between the inner tube body and the front end soft head is not less than 2 mm.

[0027] Further, the balloon is approximately spherical after expansion, and is made of silica gel material.

[0028] Compared with the prior art, the technical scheme has the following beneficial effects:

[0029] The utility model has double functions, can not only form artificial kidney hydrops, but also can plug the connection of the renal pelvis and ureter, avoid the stone to move down. Meanwhile, the connecting part of the ureteral catheter rear end is detachable, and the connecting part is detached before the patient is turned to the prone position, so that the cystoscope can be taken out in time.

[0030] In addition, the advantage of the detachable connecting part is that the liquid injection interface hole on the cystoscope is not needed, and after the cystoscope is withdrawn, the patient can be injected according to the needs of the operation, no matter in the supine position or in the prone position. DRAWINGS

[0031] Figure 1 It is the schematic diagram of the overall appearance of the ureteral catheter in one embodiment of the application;

[0032] Figure 2 It is the sectional view of the ureteral catheter in one embodiment of the application;

[0033] Figure 3 It is the sectional view of the connecting part structure in one embodiment of the application;

[0034] Figure 4 It is the schematic diagram of the structure after the balloon expansion in one embodiment of the application.

[0035] Explanation of the reference numerals in the schematic diagram:

[0036] The outer tube 1;

[0037] The balloon 2, the first opening 21, and the second opening 22;

[0038] The inner tube 3, the inner tube body 31, and the front end soft head 32;

[0039] The liquid injection channel 4;

[0040] The connecting portion 5, the first interface 51, the second interface 52, the third interface 53, the first closure plug 511, and the second closure plug 531. DETAILED DESCRIPTION

[0041] In order to further understand the content of the present application, the present application will be described in detail in conjunction with the drawings and examples.

[0042] The structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the present specification are only for the convenience of clear description, and are not used to limit the implementation range, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0043] In order to perform percutaneous nephrolithotomy, a ureteral catheter needs to be placed first to create artificial hydronephrosis, the ureteral catheter is inserted into the ureter through the urethra, and finally reaches the renal pelvis, and physiological saline is dripped from the external infusion device to create artificial hydronephrosis, which is more conducive to establishing an artificial puncture percutaneous kidney channel.

[0044] During the operation, the patient is first kept in a supine position, and a ureteral catheter is placed in the ureter on the affected side with the help of a cystoscope. After connecting the external infusion device with the ureteral catheter, physiological saline or contrast medium is injected into the kidney.

[0045] The patient is turned to a prone position, the waist operation area is disinfected and a disposable sterile surgical film is attached. Under the guidance of B-ultrasound or ultrasound, a suitable position between the posterior axillary line and the scapular line is selected for puncture. After the puncture needle enters the renal pelvis, the needle core is pulled out, and urine flow indicates successful puncture. The puncture channel is gradually expanded, and then the guide wire is inserted into the kidney through the puncture needle sheath. The percutaneous nephroscope is placed along the guide wire to observe the stone condition. The stones are crushed by using a pneumatic ballistic lithotriptor, a holmium laser or an ultrasonic lithotriptor through the percutaneous nephroscope.

[0046] The ureter of the prior art usually only has the function of injecting liquid into the kidney, i.e. only the function of creating artificial hydronephrosis. During the percutaneous nephrolithotomy process, if the stones are large, small stones may be caused to move down into the ureter during the stone crushing process. If the patient cannot excrete them by himself, it may cause urinary tract infection or urinary tract obstruction.

[0047] The ureteral catheter applied to percutaneous nephrolithotomy has a dual function, can not only form artificial hydronephrosis, but also can block the connection between the renal pelvis and the ureter to avoid the downward movement of stones. Meanwhile, the connecting part at the rear end of the ureteral catheter is detachable, and the cystoscope can be taken out in time before the patient is turned to a prone position. It should be noted that the rear end mentioned in the scheme refers to the side close to the operator, and the front end refers to the side first entering the human body.

[0048] The ureteral catheter applied to percutaneous nephrolithotomy includes a balloon catheter, an inner tube 3, a liquid injection channel 4, and a connecting part 5.

[0049] The balloon catheter includes a hollow outer tube 1 and a balloon 2, and the balloon 2 is in sealed connection with the front end of the outer tube 1. The balloon 2 is used for blocking the connection between the renal pelvis and the ureter after being expanded by liquid injection. The inner tube 3 is hollow and is used for injecting liquid into the renal pelvis. The inner tube 3 is arranged inside the balloon catheter and is substantially coaxial with the balloon catheter.

[0050] A gap is arranged between the outer wall of the inner tube 3 and the inner wall of the outer tube 1, and a liquid injection channel 4 is naturally formed. The liquid injection channel 4 is in communication with the inner cavity of the balloon 2, and liquid flows into the inner cavity of the balloon through the liquid injection channel 4, so that the balloon is expanded.

[0051] The connecting part 5 is internally provided with an internal channel for the outer tube 1 and the inner tube 3 to pass through. The inner tube 3 extends out of both ends of the connecting part 5, and the connecting part 5 is detachably connected with the outer tube 1 and the inner tube 3. When the connecting part 5 is removed, the cystoscope can be taken out in time. When the connecting part 5 is connected with the outer tube 1 and the inner tube 3, an external syringe is connected with the connecting part 5, and liquid is injected into the inner tube 3 and / or the liquid injection channel 4 through the external syringe. Liquid is injected into the inner tube 3 to form artificial hydronephrosis, and liquid is injected into the liquid injection channel 4 to expand the balloon 2. The ureteral catheter has a double channel and realizes different functions.

[0052] The detachable connecting part 5 has the advantage that a liquid injection interface on the cystoscope is not needed, and a hard cystoscope only needs to be assisted by the placement of a soft ureteral catheter. The prior art must complete the injection of artificial hydronephrosis before the cystoscope is taken out. However, due to the detachable connecting part 5, liquid injection can be performed according to the needs of the operation after the cystoscope is taken out.

[0053] For example, when the balloon catheter is not needed in the early stage of percutaneous nephrolithotomy, that is, when the connection between the renal pelvis and the ureter does not need to be blocked, liquid can be injected into the inner tube 3 through a liquid injection interface of the connecting part 5. When it is found that the renal pelvis needs to be temporarily blocked during the operation, liquid can be injected into the liquid injection channel 4 through another liquid injection interface of the connecting part 5, so that the balloon is expanded.

[0054] In addition, the prior art needs to be performed when the patient is in a supine position when injecting liquid into the kidney by means of a cystoscope; and the technical scheme of the present application does not have this limitation.

[0055] More specifically, the connecting portion 5 comprises a first interface 51, a second interface 52 and a third interface 53. The first interface 51 is used for connecting with an external infusion device for injecting liquid into the inner tube 3; the second interface 52 is located above the outer tube 1 and is used for connecting with an external injection syringe for injecting liquid into the injection channel 4; and the third interface 53 is opposite to the first interface 51 and is used for allowing 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 is located on the side of the connecting portion 5.

[0056] A first sealing plug 511 in interference fit is arranged between the inner wall of the first interface 51 and the inner tube 3, and is used for preventing the liquid in the injection channel 4 from overflowing. A second sealing plug 531 in interference fit is arranged between the inner wall of the third interface 53 and the outer wall of the outer tube 1, and is used for preventing the liquid in the injection channel 4 from overflowing.

[0057] More specifically, the inner tube 3 comprises an inner tube body 31 and a front end soft head 32 sealingly connected to the front end of the inner tube body 31. Preferably, the front end soft head 32 is sealed to the outer side of the inner tube body 31, and the sealing section is not less than 2 mm, and the front end soft head 32 is used for guiding the inner tube body 31 to enter the ureter. The front end of the front end soft head 32 is provided with a plurality of liquid outlet holes. It should be noted that the liquid outlet holes are away from the sealing section of the front end soft head 32 and the inner tube body 31.

[0058] The inner tube body 31 extends out of the outer tube 1, the balloon 2 is provided with a pair of openings, a first opening 21 is sealingly connected to the front end of the outer tube 1, a second opening 22 opposite to the first opening 21 is sealingly connected to the rear end of the front end soft head 32, and the injection channel 4 is in communication with the inner cavity of the balloon 2. In order to better ensure the sealing effect, the front end of the inner tube body 31 extends out of the second opening 22.

[0059] The front end soft head 32 located between the second opening 22 and the inner tube body 31 blocks the balloon 2, the balloon 2 is approximately spherical after expansion, and is made of silica gel.

[0060] The technical scheme can also be adjusted according to the needs of the operation. By adjusting the amount of liquid injected into the balloon 2, the balloon 2 can not completely block the connection between the renal pelvis and the ureter, so as to avoid excessive pressure in the kidney. However, the size of the gap left is smaller than the size of the stone, and the stone still cannot move down to the ureter.

[0061] The above describes the utility model and its embodiments in a schematic manner, and the description is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired thereby, without departing from the creative concept of the utility model, similar structural modes and embodiments are designed without creativity, and all should belong to the protection scope of the utility model.

Claims

1. A ureteral catheter for use with a percutaneous nephroscope, the ureteral catheter comprising: The utility model relates to a kind of balloon catheter, including, Balloon catheter, the balloon catheter includes hollow outer tube (1) and balloon (2) with outer tube (1) front end sealing connection, the balloon (2) is used to block the junction of renal pelvis and ureter after expansion; Inner tube (3), the inner tube (3) is hollow, for injecting liquid into renal pelvis;The inner tube (3) is arranged in balloon catheter, and is substantially coaxial with balloon catheter; Liquid injection channel (4), the gap between outer tube (1) and inner tube (3) is provided with liquid injection channel (4), and the liquid injection channel (4) is used to expand balloon (2); Connecting part (5), the inside of the connecting part (5) is provided with internal passage for outer tube (1) and inner tube (3) to pass through, and the connecting part (5) is detachably connected with outer tube (1) and inner tube (3); When removing connecting part (5), cystoscope exits;Connecting part (5) is used for connecting with external injector simultaneously, and the external injector is used for injecting liquid into inner tube (3) and / or liquid injection channel (4).

2. The ureteral catheter for use in percutaneous nephroscopy according to claim 1, characterized in that: The internal passage of connecting part (5) is matched with the gap between outer tube (1) and inner tube (3);The both ends of inner tube (3) are extended out of connecting part (5), and the front end of outer tube (1) is extended out of connecting part (5).

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

4. The ureteral catheter for use in percutaneous nephroscopy according to claim 3, characterized in that: The connecting part (5) further includes third interface (53), the third interface (53) is used for outer tube (1) and inner tube (3) to pass through, and the second closure plug (531) with interference fit is arranged between the inner wall of third interface (53) and the outer wall of outer tube (1), and the second closure plug (531) is used to prevent liquid in liquid injection channel (4) from overflowing.

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

6. The ureteral catheter for use in percutaneous nephroscopy according to claim 1, characterized in that: The inner tube (3) includes inner tube body (31) and front end soft head (32) with front end sealing connection of inner tube body (31), the inner tube body (31) is extended out of outer tube (1), and the front end soft head (32) is used to guide inner tube body (31) into ureter, and the front end of front end soft head (32) is provided with a plurality of liquid outlet holes.

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

8. The ureteral catheter for use in percutaneous nephroscopy according to claim 7, characterized in that: The front end of inner tube body (31) is extended out of second opening (22), and the front end soft head (32) between second opening (22) and inner tube body (31) is used to block the inner cavity of balloon (2).

9. The ureteral catheter for use in percutaneous nephroscopy according to claim 7, characterized in that: The inner tube body (31) is sealed and connected with the front end soft head (32) with a length of not less than 2 mm.

10. The ureteral catheter for use in percutaneous nephroscopy according to claim 1, characterized in that: The balloon (2) is approximately spherical after expansion, and is made of silica gel material.

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