Cup-shaped lithotripsy basket catheter

Abstract

The present invention provides a cup-shaped lithotripsy basket catheter. The present invention comprises an outer sleeve, a basket catheter and a snare connecting rod, wherein the basket catheter is arranged inside the outer sleeve, the snare connecting rod is arranged in the basket catheter, the outer sleeve comprises a first pipe section, a second pipe section and a third pipe section which are connected in sequence, the first pipe section is provided with a first lithotripsy electrode, a second lithotripsy electrode and a snare connecting rod channel, and the second pipe section and the third pipe section are provided with a basket catheter. The present invention is inserted into the common bile duct through an ERCP clamp channel, the opening or closing of the cup-shaped basket is controlled by the snare, the basket is released to trap stones, smaller stones can be removed from the common bile duct in diameter, when the stones are larger, the basket is tightened to fix the stones on the lithotripsy electrode of the catheter, the lithotripsy electrode joint is connected to a plasma, microelectrode or holmium laser wire, the stones in the common bile duct are crushed, and then the basket is used to trap the broken stones and drag them into the duodenum.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices for bile duct diseases, and in particular to a cup-shaped lithotripsy basket catheter. Background Art

[0002] Common bile duct stones are a common and frequently occurring disease in my country. Stones blocking the common bile duct may induce complications such as acute cholangitis, obstructive jaundice, and acute biliary pancreatitis, with symptoms such as chills, fever, abdominal pain, and jaundice. In severe cases, it may even lead to shock. Long-term stone stimulation may lead to the risk of bile duct cancer, making it an important disease that endangers human health. Treatment options for common bile duct stones include open biliary exploration and stone removal, laparoscopic biliary exploration and stone removal, endoscopic retrograde pancreaticocholangiopancreatography (ERCP) stone removal, percutaneous transhepatic bile duct puncture (PTCD) + fistula dilation + percutaneous transhepatic choledochoscopy (PTCS) stone removal, and duodenal papilla balloon dilatation stone removal via PTCD.

[0003] For patients who are old, have multiple underlying diseases, have cardiopulmonary dysfunction, have a history of upper gastrointestinal surgery, etc. and are not suitable for biliary exploration or ERCP, lithotripsy via PTCD, duodenal papilla balloon dilatation, basket lithotripsy or PTCS lithotripsy is often used. For common bile duct stones with a diameter of more than 1.5 cm, this treatment has the following shortcomings: 1. Using a balloon with a diameter of more than 1.5 cm for duodenal papillary sphincter balloon dilatation is prone to short-term complications such as papillary tearing and bleeding, acute pancreatitis, and perforation, as well as long-term complications such as reflux cholangitis, stone recurrence, and bile duct cancer; 2. It is difficult to remove large common bile duct stones with a basket, and the lithotripsy rate of cholesterol stones is low; 3. Before PTCS surgery, the fistula needs to be dilated before the choledochoscope can enter the common bile duct. Repeated dilatation of the fistula in one operation is prone to complications such as fistula tearing, bleeding, and liver abscess; multiple operations to dilate the fistula have a lower risk, but the total cost is high, the course of the disease is long, and patients who carry an external bile duct drainage tube for a long time have poor medical compliance and are difficult to care for; 4. PTCS stone removal requires the use of a choledochoscope, and the cost of choledochoscope equipment is relatively high, and general hospitals do not have choledochoscope equipment.

[0004] For patients who are elderly, have multiple underlying diseases, or have cardiopulmonary dysfunction and are not suitable for general anesthesia bile duct exploration surgery, ERCP lithotripsy is often used. First, the papillary sphincterotomy and balloon dilatation are performed, and then the stone is dragged into the common bile duct using a lithotripsy balloon. However, for giant common bile duct stones with a diameter of more than 1.5 cm, ERCP-assisted mechanical lithotripsy with a basket or lithotripsy under direct vision with SpyGlass is used. The above-mentioned technical tips have the following shortcomings: 1. Large papillary sphincterotomy and large balloon papillary dilatation are risky before complete stone removal. Short-term complications such as papillary bleeding, acute pancreatitis, and perforation are prone to occur during the perioperative period, as well as long-term complications such as reflux cholangitis, early recurrence of stones, and cholangitis; 2. Giant common bile duct stones often cause common bile duct obstruction. Due to the narrow space, it is difficult to remove giant common bile duct stones by inserting a lithotripsy basket through ERCP; 3. The efficiency of mechanical lithotripsy with a basket is low, and some of the stones are hard. Cholesterol stones are difficult to be crushed by the basket; 4. If the stones cannot be crushed after being taken out, and if the stones cannot be discharged through the basket, the lithotripsy basket cannot be removed, and general anesthesia biliary exploration surgery is the only option, which is risky; 5. Lithotripsy under direct vision via ERCP with SpyGlass is a new technology that has been recently developed. It has a high lithotripsy efficiency and low complications, but the cost of SpyGlass instruments and consumables is extremely high. Ordinary hospitals have not developed this technology, and ordinary families cannot afford the huge high cost of treatment. Summary of the invention

[0005] According to the technical problem raised above, a cup-shaped lithotripsy basket catheter is provided. The technical means adopted by the present invention are as follows:

[0006] A cup-shaped lithotripsy basket catheter comprises an outer sleeve, a basket catheter and a snare connecting rod, wherein the basket catheter is arranged inside the outer sleeve, the snare connecting rod is arranged in the basket catheter, and the outer sleeve comprises a first pipe section, a second pipe section and a third pipe section which are connected in sequence.

[0007] The front end of the first pipe section is conical and has a curved surface, the head end of the pipe is spherical, and a first lithotripsy electrode, a second lithotripsy electrode and a first channel are arranged inside the pipe section;

[0008] A second channel is provided inside the second pipe section, and a plurality of basket wire mounting holes are provided on the side wall at the head end thereof;

[0009] A third channel is provided inside the third pipe section, the first channel, the second channel and the third channel are connected, and the basket conduit is arranged in the second channel and the third channel;

[0010] A fourth channel is provided inside the basket catheter, in which the bodies of the basket connecting rod and the snare connecting rod are arranged, the head end of the snare connecting rod is arranged in the first channel, the bottom end of each metal wire is connected to the head end of the basket connecting rod, the head end of each metal wire is connected to the snare metal wire, and the head end of the snare connecting rod is connected to the snare metal wire;

[0011] The first lithotripsy electrode and the second lithotripsy electrode are connected to the lithotripsy electrode connector on the third pipe section after passing through the second pipe section;

[0012] In the working state, the first tube segment and the second tube segment enter the human body, and the third tube segment is located outside the human body.

[0013] Furthermore, the surface of the first pipe section is coated with a hydrophilic coating.

[0014] Furthermore, the number of the basket wire mounting holes is 4 and they are evenly distributed on the circumferential tube wall; the connecting rod type basket comprises four metal wires, a metal connecting rod arranged on the second tube segment and a basket connecting rod connected to the tail end of the metal connecting rod; the tail end of the basket connecting rod is connected to a basket handle; the head ends of the first lithotripsy electrode and the second lithotripsy electrode are arranged at the central position of the first tube segment, the middle section is arranged on the tube wall side of the second tube segment, and the basket catheter is arranged at the central position of the second tube segment.

[0015] Furthermore, the head ends of the first lithotripsy electrode and the second lithotripsy electrode, the main body of the first lithotripsy electrode and the second lithotripsy electrode located in the second pipe section, and the fourth channel are parallel to each other and do not contact each other.

[0016] Furthermore, the outer diameter of the outer sleeve is 3.2 mm.

[0017] Furthermore, the diameter of the lithotripsy wire is 0.2mm, the cross-sections of the second and third channels are 2.6x2.8mm; the outer diameter of the basket catheter is 2.4x2.6mm, the diameter of the basket metal connecting rod is 0.8mm, the cross-section of the fourth channel is 1.4x2.0mm, the outer diameter of the snare connecting rod is 1.2x1.8mm, the cross-section of the first channel is 1.0x1.4mm, the diameter of the metal connecting rod is 0.8mm, the length of the conical head end is 3mm, and the maximum diameter of the released basket is 3cm.

[0018] Furthermore, the total length of the catheter is 40 to 60 cm.

[0019] Furthermore, the total length of the catheter is 2.2 to 2.8 m.

[0020] Furthermore, the outer wall of the third pipe section is also provided with a handle sleeve fixed thereon for easy grasping, where the lithotripsy electrode joint is arranged, and left and right handles are also arranged on the outer side of the handle sleeve.

[0021] The present invention has the following advantages:

[0022] 1. The front end of the tube body of the present invention is conical, the head end of the tube body is spherical, and the surface is coated with a hydrophilic coating, which makes it easier to enter the common bile duct through the fistula;

[0023] 2. The metal wires of the basket of the present invention pass through the side wall of the conduit, so that the distance between the gold wires of the basket is constant, which can avoid deformation of the basket;

[0024] 3. The basket of the present invention is cup-shaped, which is easy to collect common bile duct stones;

[0025] 4. The present invention controls the opening or closing of the cup-shaped basket through the snare;

[0026] 5. After the stone is trapped in the basket of the present invention, tightening the snare can close the basket to prevent the stone from falling out of the basket;

[0027] 6. The basket catheter of the present invention can be pulled back to fix the common bile duct stones and make the stones close to the lithotripsy electrode at the catheter head end;

[0028] 7. The head end of the present invention is provided with a lithotripsy electrode, which can perform plasma, microelectrode and laser lithotripsy under X-ray for larger common bile duct stones without the assistance of a choledochoscope, and is more suitable for primary hospitals;

[0029] 8. The invention can tighten the basket and crush the stone at the same time, which can increase the efficiency of crushing the stone;

[0030] 9. The lithotripsy electrode of the present invention is located in the center of the catheter and the lithotripsy basket. After the stone is removed, the electrode can be kept away from the bile duct wall to prevent the electrode from damaging the bile duct wall during the lithotripsy process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 This is a schematic diagram of the main structure of the net basket of the present invention when it is retracted;

[0033] Figure 2 The cross-sectional view and the front view of the pipe segment of the present invention are schematic diagrams, wherein (a) is a top view of the first pipe segment; (b) is a cross-sectional view of the head end of the second pipe segment; (c) is a cross-sectional view of the third pipe segment; and (d) is a front view of the first pipe segment.

[0034] Figure 3 This is a schematic diagram of the main structure of the net basket of the present invention when it is in an extended state;

[0035] Figure 4This is a schematic diagram of the main structure of the net basket after stone removal of the present invention;

[0036] Figure 5 (a)(b)(c)(d) are respectively diagrams of the four state processes of stone removal and crushing in Example 1 of the present invention.

[0037] Figure 6 (a)(b)(c)(d) are respectively diagrams of the four state processes of stone removal and crushing in Example 2 of the present invention.

[0038] In the figure: 1, first tube section; 11, first lithotripsy electrode; 12, second lithotripsy electrode; 13, metal wire; 14, first channel; 15, snare connecting rod; 2, second tube section; 21, second channel; 3, third tube section; 31, handle sleeve; 32, handle; 33, angiography connector; 34, lithotripsy electrode connector; 35, basket connecting rod; 36, snare propulsion end; 37, third channel; 38, fourth channel; 39, metal connecting rod. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0040] like Figure 1 , Figure 2 (a)~(d), Figure 3 , Figure 4 As shown, this embodiment discloses a cup-shaped lithotripsy basket catheter, comprising an outer sleeve, a basket catheter and a snare connecting rod, wherein the basket catheter is arranged inside the outer sleeve, the snare connecting rod is arranged in the basket catheter, and the outer sleeve comprises a first pipe section, a second pipe section and a third pipe section which are connected in sequence.

[0041] The front end of the first pipe section 1 is conical and has a curved surface, and the head end of the pipe section is spherical, and a first lithotripsy electrode 11, a second lithotripsy electrode 12 and a first channel 14 are arranged inside the first pipe section 1;

[0042] A second channel 21 is provided inside the second pipe section 2, and a plurality of basket wire mounting holes are provided on the side wall at the head end thereof;

[0043] A third channel 37 is provided inside the third pipe section 3, the first channel, the second channel and the third channel are connected, and the basket conduit is arranged in the second channel and the third channel;

[0044] A fourth channel 38 is provided inside the basket catheter, in which the body of the basket connecting rod and the snare connecting rod 15 are arranged, the head end of the snare connecting rod is arranged in the first channel, the bottom end of each metal wire is connected to the head end of the basket connecting rod, the head end of the metal wire has a ring joint, the head end of each metal wire is connected to the snare metal wire, the head end of the snare connecting rod is connected to the snare metal wire, and the propulsion end 36 of the snare connecting rod is arranged in the third pipe section;

[0045] The first lithotripsy electrode and the second lithotripsy electrode are connected to the lithotripsy electrode connector on the third pipe section after passing through the second pipe section;

[0046] In the working state, the first tube segment and the second tube segment enter the human body, and the third tube segment is located outside the human body.

[0047] The surface of the first pipe section is coated with a hydrophilic coating.

[0048] In this embodiment, there are four basket wire mounting holes which are evenly distributed on the circumferential tube wall. The connecting rod type basket includes four metal wires 13, a metal connecting rod 39 arranged on the second tube segment and a basket connecting rod 35 connected to the tail end of the metal connecting rod. The tail of the basket connecting rod is connected to a basket handle. The head ends of the first lithotripsy electrode and the second lithotripsy electrode are arranged at the central position of the first tube segment, the middle section is arranged on the tube wall side of the second tube segment, and the basket catheter is arranged at the central position of the second tube segment.

[0049] The head ends of the first lithotripsy electrode and the second lithotripsy electrode, the main body of the first lithotripsy electrode and the second lithotripsy electrode located in the second pipe section, and the fourth channel are parallel to each other and do not contact each other.

[0050] The outer diameter of the outer sleeve is 3.2 mm.

[0051] The diameter of the lithotripsy wire is 0.2mm, and the cross-sections of the second and third channels are 2.6x2.8mm; the outer diameter of the basket catheter is 2.4x2.6mm, the diameter of the basket metal connecting rod is 0.8mm, the cross-section of the fourth channel is 1.4x2.0mm, the outer diameter of the snare connecting rod is 1.2x1.8mm, the cross-section of the first channel is 1.0x1.4mm, the diameter of the metal connecting rod is 0.8mm, the length of the tapered head end is 3mm, and the maximum diameter of the released basket is 3cm.

[0052] The outer wall of the third pipe section is also provided with a handle sleeve 31 fixed thereon for easy grasping, and left and right handles 32 are provided on both sides of the handle sleeve, where a lithotripsy electrode connector 34 is arranged.

[0053] In other optional embodiments, a radiographic connector may be provided at the tail of the basket connecting rod, and the radiographic connector 33 is connected to the second channel.

[0054] Example 1

[0055] In this embodiment, the total length of the catheter is 40 to 60 cm.

[0056] PTCD was performed first to drain bile to control biliary infection and jaundice, and the PTCD tube was left in place for 2 months.

[0057] like Figure 5 As shown in (a) to (d), a cup-shaped lithotripsy basket catheter is inserted through the PTCD fistula and delivered into the common bile duct. The basket catheter is then pushed forward to release the basket.

[0058] Push the snare rod forward, the head end of the basket opens, and the basket becomes cup-shaped.

[0059] The outer cannula is pushed forward and the common bile duct stones enter the basket.

[0060] Pull back on the snare to tighten the cup.

[0061] Pull back the lithotripsy basket catheter, the basket is tightened, and the stone is fixed to the tip of the outer sleeve.

[0062] Plasma, microelectrode or laser lithotripsy is performed. During the lithotripsy process, the basket is continuously tightened to gradually break up the common bile duct stones.

[0063] Example 2

[0064] In this embodiment, the total length of the catheter is 2.2 to 2.8 m.

[0065] After the duodenoscope was inserted orally and the bile duct was cannulated successfully, endoscopic retrograde cholangiography was performed first to determine the number, location and size of the stones, and then a small sphincter incision was made, and a cylindrical balloon with a diameter of 1.0 cm was used to dilate the duodenal papilla.

[0066] like Figure 6 As shown in (a) to (d), the basket catheter is inserted through the duodenoscope channel, the basket catheter passes through the duodenal papilla and enters the common bile duct, and the basket catheter is pushed forward to release the basket.

[0067] Push the snare rod forward, the head end of the basket opens, and the basket becomes cup-shaped.

[0068] The outer cannula is pushed forward and the common bile duct stones enter the basket.

[0069] Pull back on the snare to tighten the cup.

[0070] Pull back the lithotripsy basket catheter, the basket is tightened, and the stone is fixed to the tip of the outer sleeve.

[0071] Plasma, microelectrode or laser lithotripsy is performed. During the lithotripsy process, the basket is continuously tightened to gradually break up the common bile duct stones.

[0072] Push the basket catheter and snare rod forward again to release the basket into a cup shape.

[0073] Pull back on the snare to tighten the cup.

[0074] Pull back the lithotripsy basket catheter, the basket is tightened, larger pieces of lithotripsy are fixed to the tip of the outer sheath, and the basket catheter is pulled back to drag the lithotripsy into the duodenum.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cup-shaped lithotripsy basket catheter, characterized in that: It comprises an outer sleeve, a basket catheter and a snare connecting rod, wherein the basket catheter is arranged inside the outer sleeve, the snare connecting rod is arranged in the basket catheter, the outer sleeve comprises a first pipe section, a second pipe section and a third pipe section which are connected in sequence, the front end of the first pipe section is conical and has an arc surface, the head end of the pipe section is spherical, and a first lithotripsy electrode, a second lithotripsy electrode and a first channel are arranged inside the first pipe section; A second channel is provided inside the second pipe section, and a plurality of basket wire mounting holes are provided on the side wall at the head end thereof; A third channel is provided inside the third pipe section, the first channel, the second channel and the third channel are connected, and the basket conduit is arranged in the second channel and the third channel; A fourth channel is provided inside the basket catheter, in which the bodies of the basket connecting rod and the snare connecting rod are arranged, the head end of the snare connecting rod is arranged in the first channel, the bottom end of each metal wire is connected to the head end of the basket connecting rod, the head end of each metal wire is connected to the snare metal wire, and the head end of the snare connecting rod is connected to the snare metal wire; The first lithotripsy electrode and the second lithotripsy electrode are connected to the lithotripsy electrode connector on the third pipe section after passing through the second pipe section; The number of the basket wire mounting holes is 4 and they are evenly distributed on the circumferential pipe wall. The connecting rod type basket comprises four metal wires, a metal connecting rod arranged on the second pipe section and a basket connecting rod connected to the tail end of the metal connecting rod. The tail end of the basket connecting rod is connected to a basket handle. The head ends of the first lithotripsy electrode and the second lithotripsy electrode are arranged at the central position of the first pipe section, the middle section is arranged on the pipe wall side of the second pipe section, and the basket catheter is arranged at the central position of the second pipe section. Pulling back the basket catheter to fix the common bile duct stones and make the stones stick closely to the lithotripsy electrode at the catheter head end; The stone is crushed while tightening the basket, thereby increasing the efficiency of stone crushing; In the working state, the first pipe section and the second pipe section enter the human body, and the third pipe section is located outside the human body; The surface of the first pipe section is coated with a hydrophilic coating.

2. The cup-shaped lithotripsy basket catheter according to claim 1, characterized in that: The head ends of the first lithotripsy electrode and the second lithotripsy electrode, the main body of the first lithotripsy electrode and the second lithotripsy electrode located in the second pipe section, and the fourth channel are parallel to each other and do not contact each other.

3. The cup-shaped lithotripsy basket catheter according to claim 1, characterized in that: The outer diameter of the outer sleeve is 3.2 mm.

4. The cup-shaped lithotripsy basket catheter according to claim 1, characterized in that: The diameter of the lithotripsy wire is 0.2mm, and the cross-sections of the second and third channels are 2.6x2.8mm; the outer diameter of the basket catheter is 2.4x2.6mm, the diameter of the basket metal connecting rod is 0.8mm, the cross-section of the fourth channel is 1.4x2.0mm, the outer diameter of the snare connecting rod is 1.2x1.8mm, the cross-section of the first channel is 1.0x1.4mm, the diameter of the metal connecting rod is 0.8mm, the length of the conical head end is 3mm, and the maximum diameter of the released basket is 3cm.

5. The cup-shaped lithotripsy basket catheter according to claim 1, characterized in that: The total length of the catheter is 40 to 60 cm.

6. The cup-shaped lithotripsy basket catheter according to claim 1, characterized in that: The total length of the catheter is 2.2 to 2.8 meters.

7. The cup-shaped lithotripsy basket catheter according to claim 1, characterized in that: The outer wall of the third pipe section is also provided with a handle sleeve fixed thereon for easy grasping, where the lithotripsy electrode joint is arranged, and left and right handles are also arranged on the outer side of the handle sleeve.

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