Detachable multifunctional biliary calculus removing balloon special for ERCP

Abstract

The invention relates to the technical field of medical instruments, and discloses a detachable multifunctional biliary calculus removal balloon special for ERCP, which comprises a balloon catheter, one end of the balloon catheter is fixedly connected with a conical connector, the conical connector is internally provided with a liquid injection cavity, an air injection cavity and a guide wire cavity, and the inner wall of the air injection cavity is fixedly connected with a ventilation ring; and a pressure spring is placed in the inflator, the top end of the pressure spring abuts against a ball, a triangular plate is fixedly connected to the top of the inflator, and a deflation rod is inserted into the center of the top face of the triangular plate. The annular rubber strip is arranged on the outer surface of the balloon at the front end, so that the surface roughness of the balloon is increased, when the balloon is pulled away, the annular rubber strip can scrape off tiny broken stones and floccules on the inner wall of the pancreaticobiliary duct, the tiny broken stones and floccules are left in a rubber strip groove, large and small stones are taken out together, and the pancreaticobiliary duct is comprehensively cleaned; after gas injection, gas leakage can be effectively prevented, and filling of the balloon is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a detachable ERCP-specific multifunctional bile duct stone removal balloon. Background Art

[0002] ERCP stands for endoscopic retrograde cholangiopancreatography, which is a minimally invasive interventional diagnostic and treatment technology widely used in clinical practice, mainly used for the diagnosis and treatment of bile and pancreatic diseases. This technology inserts an endoscope into the digestive tract through the mouth, retrogrades to the descending part of the duodenum, finds the opening of the bile and pancreatic duct, and injects contrast agent through it, so as to clearly show the morphology of the bile and pancreatic duct system and provide doctors with accurate diagnosis basis.

[0003] The ERCP biliary stone removal balloon currently in common use is designed with a smooth outer surface structure to reduce friction damage to the bile duct wall when moving in the bile duct. However, this feature brings serious problems. During the stone removal process, the smooth balloon surface is difficult to provide sufficient friction or adhesion to effectively clean up the tiny stones attached to the inner wall of the pancreatic and bile duct. These tiny stones will remain in the bile duct, becoming a hidden danger of postoperative stone recurrence. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a detachable multifunctional biliary stone removal balloon dedicated to ERCP. By setting an annular rubber strip on the outer surface of the front end balloon to increase the surface roughness of the balloon, when the balloon is withdrawn, the annular rubber strip can scrape off the fine gravel and floccules on the inner wall of the pancreatic and bile ducts, leaving them in the groove of the rubber strip, so that large and small stones can be removed together, the pancreatic and bile ducts can be completely cleaned, and the above-mentioned technical problems can be solved.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a detachable ERCP-specific multifunctional biliary stone removal balloon, comprising a balloon catheter, one end of which is fixedly connected to a conical connector, the interior of the conical connector is provided with a liquid injection cavity, an air injection cavity and a guide wire cavity, the inner wall of the air injection cavity is fixedly connected to a ventilation ring, and the interior of the air injection cavity is provided with an air cylinder, a compression spring is placed inside the air cylinder, the top end of the compression spring abuts against a sphere, the top of the air cylinder is fixedly connected to a triangular plate, and a deflation rod is inserted in the center of the top surface of the triangular plate;

[0006] A double-segment balloon, both ends of which are sealed and connected to the outer wall of the balloon catheter. The double-segment balloon includes a front-end balloon, a rear-end balloon and a connecting sleeve. A connecting sleeve is fixedly connected between the front-end balloon and the rear-end balloon. A plurality of annular rubber strips are fixedly connected between the two ends of the front-end balloon. The front ends of the front-end balloon and the rear-end balloon are both conical, and the plurality of annular rubber strips are circumferentially distributed around the axis of the front-end balloon.

[0007] Preferably, the balloon catheter is provided with a liquid injection channel, an air injection channel and a guidewire channel around its axial direction, the liquid injection channel is connected to the liquid injection cavity, the air injection channel is connected to the air injection cavity, and the guidewire channel is connected to the guidewire cavity.

[0008] Preferably, a pointed cone plug is provided at one end of the balloon catheter away from the tapered connector, an oblique hole is provided inside the pointed cone plug, and the oblique hole is communicated with the guide wire channel.

[0009] Preferably, inner walls of the liquid injection cavity and the gas injection cavity are provided with internal threads, and the internal threads of the liquid injection cavity are connected to a pressure pump assembly.

[0010] Preferably, the pressure pump assembly includes a cylinder, the bottom end of the cylinder can be threadedly connected to the liquid injection chamber and the air injection chamber, the inner wall of the cylinder is tightly attached to the piston, the inside of the piston is rotatably connected to a push rod, the top end of the push rod is fixedly connected to a handle, the top end of the cylinder is threadedly connected to an end cover, the end cover is threadedly connected to the push rod, and the outer surface of the cylinder near the bottom is connected to a pressure gauge.

[0011] Preferably, the outer wall of the air cylinder is tightly attached to the inner wall of the air injection cavity, and the bottom end of the air cylinder is provided with an air hole that is connected to the ventilation ring.

[0012] Preferably, the bottom end of the compression spring contacts the inner bottom surface of the air cylinder, and the triangular plate is connected to the top end of the air cylinder by hot-melt connection.

[0013] Preferably, the outer surface of the balloon catheter is provided with two microholes, one of which is connected to the gas injection channel and the front end balloon, and the other microhole is connected to the gas injection channel and the rear end balloon.

[0014] Preferably, the front end balloon and the rear end balloon have the same elastic modulus, and the elastic modulus of the front end balloon and the rear end balloon is smaller than the elastic modulus of the connecting sleeve, so that the expansion rate of the connecting sleeve is smaller than the expansion rate of the front end balloon and the rear end balloon.

[0015] Compared with the prior art, the present invention provides a detachable ERCP-specific multifunctional biliary stone removal balloon, which has the following beneficial effects:

[0016] 1. The present invention adopts a double-stage balloon structure, in which the front-end balloon and the rear-end balloon are connected by a connecting sleeve, and the elastic modulus of the two is smaller than that of the connecting sleeve; after inflation, the front-end balloon and the rear-end balloon expand faster than the connecting sleeve, and can quickly form an arc-shaped structure, closely fitting the outer surface of larger stones. Compared with traditional balloons, the contact area and friction with the stones are greatly increased, effectively improving the success rate of taking stones out of the pancreatic and bile ducts in one go.

[0017] 2. The present invention arranges an annular rubber strip on the outer surface of the front end balloon to increase the surface roughness of the balloon. When the balloon is withdrawn, the annular rubber strip can scrape off the fine gravel and floccules on the inner wall of the pancreatic and bile duct, leaving them in the groove of the rubber strip, so that large and small stones are taken out together and the pancreatic and bile duct is completely cleaned. In addition, the gas control structure composed of the gas cylinder, compression spring, sphere and other components can effectively prevent gas leakage after gas injection, ensure the balloon is filled, and is easy to operate when deflated, so that the balloon catheter can be safely and smoothly withdrawn from the patient's body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a balloon catheter and a double-segment balloon in the present invention;

[0019] Figure 2 A stereoscopic diagram of a tapered connector and a balloon catheter in the present invention;

[0020] Figure 3 is a cross-sectional view of the tapered connector of the present invention;

[0021] Figure 4 is a cross-sectional perspective view of the gas cylinder of the present invention;

[0022] Figure 5 is a three-dimensional diagram of the pressure pump assembly of the present invention;

[0023] Figure 6 It is a cross-sectional stereoscopic view of the pressure pump assembly in the present invention.

[0024] Among them: 1. Balloon catheter; 101. Liquid injection channel; 102. Gas injection channel; 103. Guide wire channel; 104. Conical plug; 105. Oblique hole; 2. Conical connector; 201. Liquid injection cavity; 202. Gas injection cavity; 203. Guide wire cavity; 3. Ventilation ring; 4. Air cylinder; 5. Compression spring; 6. Ball; 7. Triangular plate; 8. Deflation rod; 9. Double-section balloon; 10. Front balloon; 110. Ring rubber strip; 11. Rear balloon; 12. Connecting sleeve; 13. Pressure pump assembly; 131. Cylinder; 132. Piston; 133. Push rod; 134. Turning handle; 135. End cover; 136. Pressure gauge. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1-Figure 6A detachable ERCP-specific multifunctional biliary stone removal balloon comprises a balloon catheter 1, one end of which is fixedly connected to a conical connector 2, the interior of the conical connector 2 is provided with a liquid injection cavity 201, an air injection cavity 202 and a guide wire cavity 203, a ventilation ring 3 is fixedly connected to the inner wall of the air injection cavity 202, and an air cylinder 4 is arranged inside the air injection cavity 202, a compression spring 5 is placed inside the air cylinder 4, the top of the compression spring 5 is in contact with a sphere 6, the top of the air cylinder 4 is fixedly connected to a triangular plate 7, and a deflation rod 8 is inserted in the center of the top surface of the triangular plate 7;

[0027] For the specific structure of the double-stage balloon 9, please refer to Figure 1 and Figure 2 , both ends of which are sealed and connected to the outer wall of the balloon catheter 1. The double-segment balloon 9 includes a front-end balloon 10, a rear-end balloon 11 and a connecting sleeve 12. The connecting sleeve 12 is fixedly connected between the front-end balloon 10 and the rear-end balloon 11. A plurality of annular rubber strips 110 are fixedly connected between the two ends of the front-end balloon 10. The front ends of the front-end balloon 10 and the rear-end balloon 11 are both conical, and the plurality of annular rubber strips 110 are circumferentially distributed around the axis of the front-end balloon 10.

[0028] Furthermore, the interior of the balloon catheter 1 is provided with an injection channel 101, an air injection channel 102 and a guidewire channel 103 around its axial direction, the injection channel 101 is connected to the injection cavity 201, the air injection channel 102 is connected to the air injection cavity 202, the guidewire channel 103 is connected to the guidewire cavity 203, and a pointed cone plug 104 is provided at the end of the balloon catheter 1 away from the conical connector 2, the pointed cone plug 104 is provided with an inclined hole 105 inside, and the inclined hole 105 is connected to the guidewire channel 103, the inner walls of the injection cavity 201 and the air injection cavity 202 are provided with internal threads, and the internal threads of the injection cavity 201 are connected to the pressure pump assembly 13.

[0029] The guide wire is inserted from the guide wire cavity 203 and then enters the guide wire channel 103 and the oblique hole 105. The pancreaticobiliary duct opening on the duodenal papilla is found under the action of the colonoscope, and the guide wire is inserted from the pancreaticobiliary duct opening. Then the entire balloon catheter 1 also enters the pancreaticobiliary duct along the guide wire. The contrast agent is injected into the injection cavity 201, and then the contrast agent enters the injection channel 101, thereby sending the contrast agent into the pancreaticobiliary duct. The pancreaticobiliary duct is imaged by X-ray equipment, so that the position of the stone in the pancreaticobiliary duct can be found, and the guide wire is moved to the vicinity of the stone, and then the position of the front end of the balloon catheter 1 is adjusted so that it is also close to the position of the stone.

[0030] Furthermore, the pressure pump assembly 13 includes a cylinder 131, the bottom end of which can be threadedly connected to the liquid injection chamber 201 and the air injection chamber 202, the inner wall of the cylinder 131 is tightly attached to the piston 132, the inner rotation of the piston 132 is connected to a push rod 133, the top of the push rod 133 is fixedly connected to a handle 134, the top of the cylinder 131 is threadedly connected to an end cover 135, the end cover 135 is threadedly connected to the push rod 133, and the outer surface of the cylinder 131 near the bottom is connected to a pressure gauge 136.

[0031] By threading the bottom end of the cylinder 131 with the gas injection chamber 202, and then rotating the handle 134 to drive the push rod 133 to rotate, since the push rod 133 and the end cover 135 are threadedly connected, when the push rod 133 rotates, it can drive the piston 132 to move downward, and the piston 132 injects the gas in the cylinder 131 into the gas injection chamber 202, and then the gas enters the gas injection channel 102, and then enters the double-stage balloon 9 through the two micropores on the outer surface of the balloon catheter 1, so that the double-stage balloon 9 can be filled. By setting the pressure gauge 136, the gas injection pressure can be viewed at any time, so that the pressure can be strictly controlled during gas injection.

[0032] Furthermore, the outer wall of the air cylinder 4 is tightly attached to the inner wall of the air injection cavity 202, and the bottom end of the air cylinder 4 is provided with an air hole connected to the ventilation ring 3, the bottom end of the compression spring 5 is in contact with the inner bottom surface of the air cylinder 4, and the triangular plate 7 is hot-melt connected to the top of the air cylinder 4.

[0033] Gas is injected into the injection cavity 202 through the pressure pump assembly 13, and the gas will enter the gas cylinder 4. At this time, the gas will press the ball 6 to make it move downward, and the ball 6 will compress the compression spring 5, so that the gas will enter the injection channel 102 through the ventilation ring 3. After the injection is completed, the compression spring 5 will lift the ball 6 to seal the airway at the top of the gas cylinder 4, so as to avoid gas leakage in the injection channel 102, thereby ensuring that the double-stage balloon 9 is in a filled state. After the double-stage balloon 9 brings stones out of the pancreatic and bile duct, the balloon catheter 1 needs to be withdrawn from the patient's body. Therefore, the deflation rod 8 is pressed to press the ball 6, so that the airway at the top of the gas cylinder 4 can be opened again, so that the gas in the double-stage balloon 9 can be discharged, which makes it easy to withdraw the balloon catheter 1 and the double-stage balloon 9.

[0034] Furthermore, two micropores are opened on the outer surface of the balloon catheter 1, one of which connects the gas injection channel 102 and the front end balloon 10, and the other micropore connects the gas injection channel 102 and the rear end balloon 11, the elastic modulus of the front end balloon 10 and the rear end balloon 11 are the same, and the elastic modulus of the front end balloon 10 and the rear end balloon 11 are smaller than the elastic modulus of the connecting sleeve 12, so that the expansion rate of the connecting sleeve 12 is smaller than the expansion rate of the front end balloon 10 and the rear end balloon 11.

[0035] When the double-segment balloon 9 is inside the pancreatic and bile duct, the position of the double-segment balloon 9 is adjusted so that the larger end is between the front end balloon 10 and the rear end balloon 11, and then the front end balloon 10 and the rear end balloon 11 are filled to expand. Since the elastic modulus of the front end balloon 10 and the rear end balloon 11 are the same, and the elastic modulus of the front end balloon 10 and the rear end balloon 11 are smaller than the elastic modulus of the connecting sleeve 12, the expansion speed of the front end balloon 10 and the rear end balloon 11 is the same, while the connecting sleeve 12 expands slowly. In this way, an arc-shaped structure is formed between the front end balloon 10 and the rear end balloon 11, which is easy to fit on the outer surface of the larger stone, thereby wrapping the stone to a certain extent. Compared with the traditional balloon, which can only contact the inner wall of the pancreatic and bile duct after expansion, and the contact area between the balloon and the stone is small, the friction between the balloon and the stone is small. By setting the double-segment balloon 9, the friction between the balloon and the stone can be increased, which is conducive to taking the stone out of the pancreatic and bile duct at one time.

[0036] Since the existing stone removal balloon has a smooth arc-shaped transition between its two ends and the side after expansion, if there are fine gravel or flocs on the inner wall of the pancreatic and bile duct, the traditional balloon cannot remove these fine gravel or flocs due to its smooth outer wall. By providing a plurality of annular rubber strips 110 on the outer surface of the front end balloon 10, the roughness can be effectively increased, so that when the front end balloon 10 is pulled out, the annular rubber strips 110 can be driven to scrape off the fine gravel on the inner wall of the pancreatic and bile duct, so that the gravel can be in the grooves between the plurality of annular rubber strips 110, so that larger stones and fine gravel can be removed from the pancreatic and bile duct at one time and discharged into the duodenum, and these stones can eventually be discharged from the intestine.

[0037] When in use, first, insert the guide wire from the guide wire cavity 203, through the guide wire channel 103 and the oblique hole 105, under the action of the colonoscope, make the guide wire enter from the pancreatic and bile duct opening on the duodenal papilla, and then the balloon catheter 1 enters the pancreatic and bile duct along the guide wire; then, by injecting contrast agent into the injection cavity 201, the contrast agent enters the pancreatic and bile duct through the injection channel 101, using X-ray equipment to find the location of the stone in the pancreatic and bile duct, move the guide wire to the vicinity of the stone, and adjust the front end of the balloon catheter 1 to be close to the stone; then, the bottom end of the cylinder 131 is threadedly connected to the gas injection cavity 202, and the handle 134 is rotated to drive the push rod 133 to rotate, so that the piston 132 moves downward, and the gas in the cylinder 131 is injected into the gas injection cavity 202, and the gas fills the double-segment balloon 9 through the gas injection channel 102 and the micropores on the outer surface of the balloon catheter 1, and the gas injection is controlled by the air pressure gauge 136 Pressure; during gas injection, gas enters the gas cylinder 4 to press the ball 6 to compress the compression spring 5, and the gas enters the gas injection channel 102 through the ventilation ring 3. After the gas injection is completed, the compression spring 5 lifts the ball 6 to seal the airway to ensure that the double-stage balloon 9 is filled; when the double-stage balloon 9 is in the pancreatic and bile duct, the position is adjusted so that the larger stone is between the front balloon 10 and the rear balloon 11. Because the elastic modulus of both is smaller than the connecting sleeve 12, the front balloon 10 and the rear balloon 11 expand rapidly to form an arc to wrap the stone, increasing the friction with the stone; since the annular rubber strip 110 on the outer surface of the front balloon 10 increases the roughness, the fine gravel on the inner wall of the pancreatic and bile duct can be scraped off when it is withdrawn, causing it to fall into the groove of the annular rubber strip 110; after taking out the stone, if it is necessary to withdraw the balloon catheter 1 and the double-stage balloon 9, press the deflation rod 8 to press the ball 6, open the airway at the top of the gas cylinder 4, and discharge the gas in the double-stage balloon 9.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detachable multifunctional biliary stone removal balloon for ERCP, characterized in that: include, A balloon catheter (1), one end of which is fixedly connected to a conical connector (2), the interior of the conical connector (2) is provided with a liquid injection cavity (201), an air injection cavity (202) and a guide wire cavity (203), the inner wall of the air injection cavity (202) is fixedly connected to a ventilation ring (3), and the interior of the air injection cavity (202) is provided with an air cylinder (4), a compression spring (5) is placed inside the air cylinder (4), the top end of the compression spring (5) is in contact with a sphere (6), the top of the air cylinder (4) is fixedly connected to a triangular plate (7), and a deflation rod (8) is inserted into the center of the top surface of the triangular plate (7); A double-segment balloon (9) has two ends sealedly connected to the outer wall of the balloon catheter (1). The double-segment balloon (9) comprises a front-end balloon (10), a rear-end balloon (11) and a connecting sleeve (12). The connecting sleeve (12) is fixedly connected between the front-end balloon (10) and the rear-end balloon (11). A plurality of annular rubber strips (110) are fixedly connected between the two ends of the front-end balloon (10). The front ends of the front-end balloon (10) and the rear-end balloon (11) are both conical, and the plurality of annular rubber strips (110) are circumferentially distributed around the axis of the front-end balloon (10).

2. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 1, characterized in that: The interior of the balloon catheter (1) is provided with a liquid injection channel (101), an air injection channel (102) and a guidewire channel (103) around its axial direction; the liquid injection channel (101) is connected to the liquid injection cavity (201), the air injection channel (102) is connected to the air injection cavity (202), and the guidewire channel (103) is connected to the guidewire cavity (203).

3. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 2, characterized in that: A pointed cone plug (104) is provided at one end of the balloon catheter (1) away from the conical connector (2), an inclined hole (105) is provided inside the pointed cone plug (104), and the inclined hole (105) is communicated with the guide wire channel (103).

4. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 1, characterized in that: Internal threads are provided on the inner walls of the liquid injection cavity (201) and the gas injection cavity (202), and the internal threads of the liquid injection cavity (201) are connected to a pressure pump assembly (13).

5. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 4, characterized in that: The pressure pump assembly (13) comprises a cylinder (131), the bottom end of which can be threadedly connected to a liquid injection chamber (201) and an air injection chamber (202), the inner wall of the cylinder (131) is tightly attached to a piston (132), the piston (132) is rotatably connected to a push rod (133) inside, the top end of the push rod (133) is fixedly connected to a handle (134), the top end of the cylinder (131) is threadedly connected to an end cover (135), the end cover (135) is threadedly connected to the push rod (133), and the outer surface of the cylinder (131) near the bottom end is connected to a pressure gauge (136).

6. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 1, characterized in that: The outer wall of the air cylinder (4) is tightly attached to the inner wall of the air injection cavity (202), and the bottom end of the air cylinder (4) is provided with an air hole that is connected to the ventilation ring (3).

7. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 1, characterized in that: The bottom end of the compression spring (5) contacts the inner bottom surface of the air cylinder (4), and the triangular plate (7) is connected to the top end of the air cylinder (4) by thermal melting.

8. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 2, characterized in that: The outer surface of the balloon catheter (1) is provided with two micropores, one of which is connected to the gas injection channel (102) and the front end balloon (10), and the other micropore is connected to the gas injection channel (102) and the rear end balloon (11).

9. The detachable multifunctional biliary stone removal balloon for ERCP according to claim 1, characterized in that: The front end balloon (10) and the rear end balloon (11) have the same elastic modulus, and the elastic modulus of the front end balloon (10) and the rear end balloon (11) are smaller than the elastic modulus of the connecting sleeve (12), so that the expansion rate of the connecting sleeve (12) is smaller than the expansion rate of the front end balloon (10) and the rear end balloon (11).

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