Quick exchange type extension catheter
By designing a fast exchange-type extended catheter, the problem of insufficient support force of the access pathway in neurointerventional surgery is solved, and rapid exchange of catheters and efficient thrombus aspiration is achieved, reducing the surgical time.
Patent Information
- Application Number
- CN202420611973.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-03-27
AI Technical Summary
In neurointerventional surgery, the pathway support is insufficient after the initial pathway is established, the long guidewire is inconvenient to use, and it cannot be exchanged quickly. The distal small blood vessel aspiration efficiency is low, and it is difficult.
A fast exchange extension catheter is designed, including an outer tube, a balloon, a delivery rod and a support core wire, which provides smooth transition through a spiral sea wave tube cutting structure, balloon sealing passage, and supports the core wire to enhance support force, achieving rapid exchange and efficient suction.
It improves the support force and suction efficiency of the catheter, reduces the surgical time, enhances the flexibility and passability of the catheter, and achieves rapid exchange and efficient thrombotic aspiration.
Smart Images
Figure CN223054510U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a rapid exchange type extension catheter. Background Technique
[0002] As the name implies, neurointerventional technology is used to treat nervous system diseases. It is supported by a digital subtraction angiography (DSA) system and adopts intravascular catheter operation technology. Through specific methods such as selective angiography, embolization, angioplasty, mechanical clearance, and drug delivery, it diagnoses and treats lesions involving the human neurovascular system. It is a new minimally invasive clinical technology that has opened up new ideas and treatment approaches for many brain and spinal cord vascular diseases. It can not only independently solve many cerebrovascular diseases, but also be cleverly combined with traditional open surgery, radiotherapy, etc., so that diseases that were previously unable or difficult to treat can achieve satisfactory curative effects. With the in-depth understanding of many diseases and the update of concepts, the status of neurointerventional technology in the treatment of cerebrovascular diseases is getting higher and higher. It has become a popular discipline and has been rapidly developed and popularized.
[0003] Referring to the authorized patent CN 215503256U, it can be seen that there are deficiencies in the clinical technology of neurointerventional surgery as follows: when the initial access is established and it is found that the access support force is insufficient, a long guide wire (260 - 320 cm) needs to be exchanged, and then subsequent instruments are delivered. The long guide wire is inconvenient to use and cannot be rapidly exchanged. When aspirating thrombus from distal small blood vessels, the thrombus needs to be aspirated to the outside of the body through a long channel, with low aspiration efficiency and great difficulty in recanalization. Content of the Utility Model
[0004] The utility model aims to solve the following technical problems existing in the clinical technology of neurointerventional surgery: when the initial access is established and it is found that the access support force is insufficient, a long guide wire (260 - 320 cm) needs to be exchanged, and then subsequent instruments are delivered. The long guide wire is inconvenient to use and cannot be rapidly exchanged. When aspirating thrombus from distal small blood vessels, the thrombus needs to be aspirated to the outside of the body through a long channel, with low aspiration efficiency and great difficulty in recanalization, and provides a rapid exchange type extension catheter.
[0005] The utility model solves the above technical problems through the following technical solutions:
[0006] The utility model provides a rapid exchange type extension catheter, and the rapid exchange type extension catheter includes:
[0007] An outer tube, with an intermediate reinforcing layer arranged inside the outer tube, a suction catheter sleeved on the surface of the outer tube, and a balloon arranged at the right end of the outer tube,
[0008] The head end of the tube body, the right end surface of the head end of the tube body is sleeved with a distal end development mark, the head end of the tube body is heat-sealed and fixed to the outer tube through the distal end development mark, and the distal end development mark is used to show the position of the extension tube head end;
[0009] A connecting ring, the connecting ring is welded to the right end of the middle reinforcement layer, the right end of the connecting ring is fixedly connected to a delivery rod, a filling hole is provided at the connection between the balloon and the outer tube, the surface of the delivery rod is covered with a nylon resin sheath, the right end of the delivery rod is bonded to a tube seat by adhesive, the adhesive is used to bond the delivery rod and the tube seat, and is medical UV adhesive or instant adhesive, a male Luer is installed on the right end of the tube seat, a rotating fixing chuck is installed on the right end of the male Luer, and a supporting core wire runs through the delivery rod.
[0010] In this technical solution, the left end of the extension tube delivery rod part is a spiral sea wave tube cutting structure, which can provide a smoother transition, and the extension tube can be quickly exchanged. When a stronger support force is needed, a support core wire can be inserted into the delivery rod to improve the support force of the transition section of the extension catheter. The right end of the extension tube body is equipped with a balloon. When the extension tube needs to be placed at the left end for suction, when the head end of the extension tube reaches the thrombus site, the balloon is filled so that the balloon and the passage outside the extension tube are sealed, and then suction is performed through the external channel. When the thrombus is sucked to the external channel, it can be quickly attracted to the outside of the body to improve the suction efficiency. Compared with traditional access catheters or support catheters, the extension tube can be quickly exchanged to reduce the operation time. At the same time, the hardness of the left end can be changed. When a higher position is required, the support core wire can be inserted into the delivery rod first to improve the passability and position of the extension tube. The operator can insert the support core wire according to the needs, and the use method is more flexible.
[0011] Compared with the traditional suction catheter, which has the same inner cavity or can only be changed in diameter with a small difference, the extension tube of the present invention has a balloon at the right end of the tube body, and the balloon can be filled and depressurized through the inner cavity of the delivery rod. During suction, the balloon is filled to complete the connection and sealing between the extension tube and the external tube body. The extension tube body channel is shorter, and the path of the thrombus through the smaller tube body is short. When the thrombus enters the external tube body with a large inner diameter, it can be efficiently extracted from the body.
[0012] The head end of the tube body is made of a TPU material with sufficient toughness and has a length of 0.5-1 mm. The head end of the tube body provides a flexible head end for the extension tube, and the head end is rounded.
[0013] The distal development mark is a platinum-iridium alloy ring, the size of which matches the extension tube of the corresponding outer diameter, with a wall thickness of 0.025-0.05 mm and a length of 0.5-1.2 mm. The distal development mark is used to display the position of the extension tube head end.
[0014] The middle reinforcement layer is used to provide support for the outer tube. The middle reinforcement layer is a corrugated tube carved from a stainless steel tube, or a braided tube structure woven from nitinol alloy or stainless steel wire, or a spring structure wound from nitinol alloy wire or stainless steel wire, or a combination of a spring structure wound from nitinol alloy wire or stainless steel wire at the left end and a braided tube structure at the right end;
[0015] When the middle reinforcement layer is a cut corrugated tube, the wall thickness of the corrugated tube is 0.05 - 0.10 mm. The cutting gap at the left end of the corrugated tube is small, and the gap at the right end is large. The overall cutting method is a gradual change, ensuring the flexibility at the left end and the support at the right end;
[0016] When the middle reinforcement layer is a braided tube structure, the braided wires of the braided tube are round wires or flat wires. When they are round wires, the wire diameter range is 0.035 - 0.08 mm. When they are flat wires, the thickness of the wire is 0.02 - 0.05 mm, and the width of the wire is 0.05 - 0.15 mm;
[0017] When the middle reinforcement layer is wound with nitinol alloy wire or stainless steel wire, the wire is a round wire with a wire diameter of 0.04 - 0.08 mm;
[0018] When the middle reinforcement layer is a combination of a spring structure wound from nitinol alloy wire or stainless steel wire at the left end and a braided tube structure at the right end, the winding length at the left end is 5 - 15 cm, the wire is a round wire with a wire diameter of 0.04 - 0.08 mm. When the braided wires of the braided tube are round wires, the wire diameter range is 0.035 - 0.08 mm. When they are flat wires, the thickness of the wire is 0.02 - 0.05 mm, and the width of the wire is 0.05 - 0.15 mm.
[0019] The outer tube is a resin welded in multiple segments in sequence. From the left end to the right end of the outer tube, TPU with a hardness of 45 - 80A and Pebax resin with gradually increasing hardness with a hardness of 35D - 72D are selected, and the wall thickness of the resin is 0.05 - 0.075 mm.
[0020] In this technical solution, the function of the outer tube is that the hardness changes gradually. The left end has good flexibility, and the right end has good support, ensuring that the pushing force can be smoothly transmitted to the left end, and at the same time, the left end can pass through the diseased blood vessel well.
[0021] The balloon is made of TPU, silicone, or modified nylon material.
[0022] In the present technical solution, when the outer tube is a TPU or silicone balloon, the transition of the tube body is relatively smooth and has good compliance. When the outer tube is made of modified nylon, the transition of the tube body is relatively hard, but the balloon can withstand greater negative pressure. When the balloon is made of TPU or silicone, the thickness of the balloon body is 0.05-0.075mm. When the balloon body is made of modified nylon, the thickness of the balloon body is 0.025-0.05mm. The variable range of the filled outer diameter of the balloon is 1mm-3mm. When suction is required, the filling of the balloon can close the gap with the suction catheter to avoid pressure loss during suction, especially when the outer diameter of the extension tube is greatly different from the inner diameter of the external catheter, which can ensure smooth suction.
[0023] The connecting ring is carved from a platinum-tungsten alloy or platinum-iridium alloy tube, and there is a cut groove in the middle of the right end for connecting to the conveying rod. The connecting ring and the conveying rod are fixed by laser welding. The size of the connecting ring matches the extension tube of the corresponding outer diameter, the wall thickness is 0.025-0.05mm, and the length is 3-10mm. The connecting ring has a larger gap after laser engraving. The connecting ring is used to display the position of the head end of the extension tube to prevent its position from exceeding the head end of the external catheter. The larger gap is conducive to the flow of resin and strengthens the connection strength between the connecting ring and the tube body. The conveying rod is made of stainless steel tube, which is used to push and withdraw the extension tube. The left end of the conveying rod is ground with a gradual taper and then cut with a gradual spiral laser. The conveying rod is covered with a layer of nylon resin sheath. The outer diameter of the pushing steel tube is 0.30-1.0mm, the wall thickness is 0.025-0.1mm, and the length is 150-180cm.
[0024] In the technical solution, during the manufacturing process, one end is fixed to the connecting ring by laser welding, and the other end is fixed to the tube seat by adhesive. The left end of the conveying rod is gradually spirally cut to enhance flexibility.
[0025] The filling hole is cut by laser, and the shape of the hole is oval or circular, the length of the hole is 1-2 mm, and the width is 1 / 3-1 / 2 of the left end diameter, and is used for filling and relieving pressure of the balloon.
[0026] In the present technical solution, the filling hole is cut by laser, and the shape of the hole is elliptical or circular, and is used for filling and relieving pressure of the balloon.
[0027] The resin sheath is used to establish a stable and sealed channel for balloon filling and pressure relief, and to fix the left end hypotube to avoid deformation. The thickness of the resin sheath is 0.05-0.1 mm.
[0028] The diameter of the support core wire is 0.02mm-0.05mm smaller than the inner cavity of the delivery rod, and the length is 150-200cm. The outer surface of the support core wire is coated with a PTFE coating to increase the passability of the support core wire in the inner cavity of the delivery rod.
[0029] In the present technical solution, the function of the supporting core wire is to pass through the tube seat to the left end of the conveying rod when it is necessary to increase the supporting force of the transition section and the right end of the extension tube, and to fit well with the conveying rod.
[0030] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.
[0031] The positive and progressive effects of the utility model are:
[0032] The above-mentioned quick-exchange extension catheter has a spiral sea wave tube cutting structure at the left end of the extension tube delivery rod, which can provide a smoother transition. The extension tube can be quickly exchanged. When a stronger support force is needed, a support core wire can be inserted into the delivery rod to improve the support force of the transition section of the extension catheter. The right end of the extension tube body is equipped with a balloon. When the extension tube needs to be placed at the left end for suction, when the head end of the extension tube reaches the thrombus site, the balloon is filled so that the balloon and the passage outside the extension tube are sealed, and then suction is performed through the external channel. When the thrombus is sucked to the external channel, it can be quickly sucked out of the body to improve the suction efficiency. Compared with traditional access catheters or support catheters, the extension tube can be quickly exchanged to reduce the operation time. At the same time, the hardness of the left end can be changed. When a higher position is required, the support core wire can be inserted into the delivery rod first, which improves the passability and position of the extension tube. The operator can insert the support core wire according to needs, and the use method is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 This is a schematic diagram of the structure of a balloon extension catheter of the utility model, in which the middle reinforcement layer of the rapid exchange extension catheter is a laser engraved hypotube.
[0034] Figure 2 The utility model is a schematic diagram of the structure of a balloon extension catheter in which the middle reinforcement layer of the rapid exchange extension catheter is a braided tube.
[0035] Figure 3 The utility model is a schematic diagram of the structure of a balloon extension catheter in which the middle reinforcing layer of the rapid exchange extension catheter is wound with a spring.
[0036] Figure 4 This is a schematic structural diagram of a balloon extension catheter of the utility model, in which the middle reinforcement layer of the rapid exchange extension catheter is a distal spring wrapped around a proximal braided tube.
[0037] Figure 5 It is a schematic diagram of the connection structure between the extension catheter and the supporting core wire of the quick-exchange extension catheter of the utility model.
[0038] Figure 6 It is a schematic diagram of the connection structure between the catheter and the suction tube of the quick-exchange extension catheter of the utility model.
[0039] Figure 7 Schematic diagram of the connection structure between the male Luer and the rotary fixing chuck of the quick-exchange type extension catheter of the present utility model.
[0040] Figure 8 Schematic diagram of the long sheath of the radial artery of the quick-exchange type extension catheter of the present utility model being sent from the right radial artery to the left carotid artery, with the distal end of the long sheath being at a relatively low position.
[0041] Figure 9 Schematic diagram of the microcatheter being delivered to the target position within the long sheath of the radial artery of the quick-exchange type extension catheter of the present utility model.
[0042] Figure 10 Schematic diagram of the extension tube being placed within the long sheath of the radial artery of the quick-exchange type extension catheter of the present utility model.
[0043] Figure 11 Schematic diagram of the pushing device within the microcatheter of the quick-exchange type extension catheter of the present utility model.
[0044] Figure 12 Schematic diagram of the aspiration catheter of the quick-exchange type extension catheter of the present utility model being sent to the end of the internal carotid artery to the horizontal segment of the middle cerebral artery.
[0045] Figure 13 Schematic diagram of the thrombus of the quick-exchange type extension catheter of the present utility model being aspirated into the large-lumen aspiration catheter through the small-lumen extension tube.
[0046] Description of reference numerals
[0047] 1. Head end of the tube body; 2. Distal imaging marker; 3. Intermediate reinforcement layer; 4. Outer tube; 5. Balloon; 6. Connection ring; 7. Filling hole; 8. Delivery rod; 9. Resin sheath; 10. Adhesive; 11. Tube seat; 12. Support core wire; 13. Male Luer; 14. Rotary fixing chuck; 15. Aspiration catheter. Detailed implementation manners
[0048] The present utility model will be further described below by way of examples, but the present utility model is not limited to the scope of the described examples.
[0049] As Figures 1-13 shown, the quick-exchange type extension catheter includes:
[0050] An outer tube 4, an intermediate reinforcement layer 3 is arranged inside the outer tube 4, an aspiration catheter 15 is sleeved on the surface of the outer tube 4, and a balloon 5 is arranged at the right end of the outer tube 4.
[0051] A tube body head end 1, wherein a distal end development mark 2 is sleeved on the right end surface of the tube body head end 1, and the tube body head end 1 is heat-sealed and fixed to the outer tube 4 through the distal end development mark 2, and the distal end development mark 2 is used to indicate the position of the extension tube head end;
[0052] A connecting ring 6 is welded to the right end of the middle reinforcing layer 3, and a delivery rod 8 is fixedly connected to the right end of the connecting ring 6. A filling hole 7 is provided at the connection between the balloon 5 and the outer tube 4. A nylon resin sheath 9 is covered on the surface of the delivery rod 8. The right end of the delivery rod 8 is bonded to a tube seat 11 by an adhesive 10. The adhesive 10 is used to bond the delivery rod 8 to the tube seat 11, and is a medical UV adhesive or instant adhesive. A male Luer 13 is installed at the right end of the tube seat 11, and a rotating fixing chuck 14 is installed at the right end of the male Luer 13. A supporting core wire 12 runs through the delivery rod 8.
[0053] In the present technical solution, the left end of the extension tube delivery rod 8 is a spiral hypotube cutting structure, which can provide a smoother transition, and the extension tube can be quickly exchanged. When a stronger support force is needed, the support core wire 12 can be inserted into the delivery rod 8 to improve the support force of the transition section of the extension catheter. The right end of the extension tube body is equipped with a balloon 5. When the extension tube needs to be placed at the left end for suction, when the head end of the extension tube reaches the thrombus site, the balloon 5 is filled so that the balloon 5 and the passage outside the extension tube are sealed, and then suction is performed through the external channel. When the thrombus is sucked to the external channel, it can be quickly attracted to the outside of the body to improve the suction efficiency. Compared with the traditional access catheter or support catheter, the extension tube can be quickly exchanged to reduce the operation time. At the same time, the hardness of the left end can be changed. When a higher position is required, the support core wire 12 can be not inserted into the delivery rod 8 first, so as to improve the passability and position of the extension tube. The operator can insert the support core wire 12 according to the needs, and the use method is more flexible.
[0054] Compared with the conventional suction catheter 15, which has the same inner cavity or can only be changed in diameter with a small difference, the extension tube of the present invention has a balloon 5 at the right end of the tube body, and the balloon 5 can be filled and depressurized through the inner cavity of the delivery rod 8. During suction, the balloon 5 is filled to complete the connection and sealing between the extension tube and the external tube body. The extension tube body channel is shorter, and the path of the thrombus through the smaller tube body is shorter. When the thrombus enters the external tube body with a larger inner diameter, it can be efficiently extracted from the body.
[0055] The tube head end 1 is made of a TPU material with sufficient toughness and has a length of 0.5-1 mm. The tube head end 1 provides a flexible head end for the extension tube, and the head end is rounded to avoid damaging blood vessels.
[0056] The distal development mark 2 is a platinum-iridium alloy ring, the size of which matches the extension tube of the corresponding outer diameter, with a wall thickness of 0.025-0.05 mm and a length of 0.5-1.2 mm. The distal development mark 2 is used to display the position of the extension tube head end.
[0057] The intermediate reinforcing layer 3 is used to provide support for the outer tube 4. The winding structure has good flexibility and the braided structure has good support. The intermediate reinforcing layer 3 is a hypotube carved from a stainless steel tube, or a braided tube structure braided from nickel-titanium alloy or stainless steel wire, or a spring structure wound from nickel-titanium alloy wire or stainless steel wire, or a combination of a spring structure wound from nickel-titanium alloy wire or stainless steel wire with nickel-titanium at the left end and a braided tube structure at the right end;
[0058] When the middle reinforcement layer 3 is cut as a hypotube, the wall thickness of the hypotube is 0.05-0.10mm, the left end of the hypotube has a small cutting gap, and the right end has a large gap, and the overall cutting method is a gradual cutting method to ensure the flexibility of the left end and the support of the right end;
[0059] When the middle reinforcing layer 3 is a braided tube structure, the braided wire of the braided tube is round wire or flat wire. When it is round wire, the wire diameter ranges from 0.035 to 0.08 mm. When it is flat wire, the wire thickness is 0.02 to 0.05 mm and the wire width is 0.05 to 0.15 mm.
[0060] When the middle reinforcing layer 3 is wound with nickel-titanium alloy wire or stainless steel wire, the wire diameter is a round wire of 0.04-0.08 mm;
[0061] When the middle reinforcing layer 3 is a combination of a spring structure with nickel-titanium wire or stainless steel wire wound around the left end and a braided tube structure at the right end, the left end is wound with a length of 5-15cm and a round wire with a wire diameter of 0.04-0.08mm. When the braided wire of the braided tube is round wire, the wire diameter range is 0.035-0.08mm. When it is a flat wire, the wire thickness is 0.02-0.05mm and the wire width is 0.05-0.15mm.
[0062] The outer tube 4 is a resin with multiple sections welded in sequence. From the left end to the right end of the outer tube 4, TPU hardness 45-80A and Pebax resin with hardness gradually increased are 35D-72D in sequence, and the resin wall thickness is 0.05-0.075mm.
[0063] In this technical solution, the outer tube 4 functions to have a gradually changing hardness, with good flexibility at the left end and good support at the right end, ensuring that the pushing force can be smoothly transmitted to the left end, while the left end can pass through the diseased blood vessel well.
[0064] The balloon 5 is made of TPU, silica gel or modified nylon.
[0065] When the outer tube 4 is made of TPU or silicone balloon 5, the transition of the tube body is relatively smooth and the compliance is good. When the outer tube 4 is made of modified nylon, the transition of the tube body is relatively hard, but the balloon 5 can withstand a larger negative pressure. When the balloon 5 is made of TPU or silicone, the thickness of the balloon body is 0.05-0.075mm. When the balloon body is made of modified nylon, the thickness of the balloon body is 0.025-0.05mm. The variable range of the filled outer diameter of the balloon 5 is 1mm-3mm. When suction is required, the filling of the balloon 5 can close the gap with the suction catheter 15 to avoid pressure loss during suction, especially when the outer diameter of the extension tube is greatly different from the inner diameter of the external catheter, which can ensure smooth suction.
[0066] The connecting ring 6 is carved from a platinum-tungsten alloy or platinum-iridium alloy tube, and a groove is cut in the middle of the right end for connecting to the conveying rod 8. The connecting ring 6 and the conveying rod 8 are fixed by laser welding. The size of the connecting ring 6 matches the extension tube of the corresponding outer diameter, the wall thickness is 0.025-0.05mm, and the length is 3-10mm. The connecting ring 6 has a larger gap after laser engraving. The connecting ring 6 is used to display the position of the head end of the extension tube to prevent its position from exceeding the head end of the external catheter. The larger gap is conducive to the flow of resin and strengthens the connection strength between the connecting ring 6 and the tube body. The conveying rod 8 is made of stainless steel tube and is used to push and withdraw the extension tube. The left end of the conveying rod 8 is ground with a gradual taper and then cut with a laser gradual spiral. The conveying rod 8 is covered with a layer of nylon resin sheath 9. The outer diameter of the pushing steel tube is 0.30-1.0mm, the wall thickness is 0.025-0.1mm, and the length is 150-180cm.
[0067] During the manufacturing process, one end is fixed to the connecting ring 6 by laser welding, and the other end is fixed to the tube seat 11 by adhesive 10. The left end of the conveying rod 8 is gradually spirally cut to enhance flexibility.
[0068] The filling hole 7 is cut by laser, and the shape of the hole is oval or circular, the length of the hole is 1-2 mm, and the width is 1 / 3-1 / 2 of the left end diameter, and is used for filling and relieving pressure of the balloon 5.
[0069] The filling hole 7 is cut by laser and has an elliptical or circular shape, and is used for filling and relieving pressure of the balloon 5 .
[0070] The resin sheath 9 is used to establish a stable and sealed channel for filling and decompressing the balloon 5, and to fix the left end of the hypotube to avoid deformation. The thickness of the resin sheath 9 is 0.05-0.1 mm.
[0071] The diameter of the support core wire 12 is 0.02mm-0.05mm smaller than the inner cavity of the delivery rod 8, and the length is 150-200cm. The support core wire 12 is coated with a PTFE coating to increase the passability of the support core wire 12 in the inner cavity of the delivery rod 8.
[0072] The function of the supporting core wire 12 is that when it is necessary to increase the supporting force of the transition section of the extension tube and the right end, it can penetrate from the tube seat 11 to the left end of the conveying rod 8 and fit well with the conveying rod 8 in a nested manner.
[0073] Among them, the outer diameter of the extension tube is 3F - 7F, the inner diameter is 0.033 inches - 0.081 inches, the length of the catheter is 15 - 45 cm, the overall length is 150 - 200 cm, and the inner lining of the tube can be PTFE or without an inner lining. Other intermediate layer configurations. The connection details between the extension tube body and the conveying rod 8, the fixation of the extension catheter and the supporting core wire 12, and the connection and sealing between the extension catheter and the external catheter.
[0074] When the present utility model is in use: Send the right radial artery long sheath to the left carotid artery through the right radial artery. At this time, the position of the head end of the long sheath is relatively low, as Figure 8 shown; Deliver the microcatheter to the target position within the right radial artery long sheath, as Figure 9 shown; When pushing the instrument within the microcatheter, the supporting force of the long sheath is insufficient, and it falls into the ascending aortic arch through the right radial long sheath, as Figure 9 shown; Place the extension tube into the right radial long sheath, as Figure 10 shown; (If sufficient supporting force is required, insert the supporting core wire, not marked in the figure); After extending and delivering the microcatheter, push the device within the microcatheter. At this time, the instrument can be stably delivered through the right radial long sheath, as Figure 11 shown, as Figure 12 , send the aspiration catheter to the end of the internal carotid artery to the horizontal segment of the middle cerebral artery. At this time, the thicker aspiration catheter cannot enter the thinner distal occluded blood vessel; Figure 12 , push the aspiration catheter with an extended diameter to the head end to contact the thrombus; as Figure 12 , inflate the proximal balloon of the extension tube to seal the inner cavity of the aspiration catheter and the extension tube; as Figure 13 , use the aspiration catheter for aspiration; as Figure 13 , the thrombus is aspirated into the large-lumen aspiration catheter through the small-lumen extension tube and can be quickly aspirated to the outside of the body.
[0075] The present utility model is not limited to the above embodiments. No matter what changes are made in its shape or structure, they all fall within the protection scope of the present utility model. The protection scope of the present utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present utility model, but these changes and modifications all fall within the protection scope of the present utility model.
Claims
1. A rapid exchange type extension catheter, characterized in that, The rapid exchange extension catheter comprises: An outer tube (4), wherein an intermediate reinforcement layer (3) is arranged inside the outer tube (4), a suction catheter (15) is sleeved on the surface of the outer tube (4), and a balloon (5) is arranged at the right end of the outer tube (4). A tube body head end (1), wherein a distal end developing mark (2) is sleeved on the right end surface of the tube body head end (1), and the tube body head end (1) is heat-sealed and fixed to the outer tube (4) via the distal end developing mark (2), and the distal end developing mark (2) is used to indicate the position of the extension tube head end; A connecting ring (6), wherein the connecting ring (6) is welded to the right end of the intermediate reinforcing layer (3), and the right end of the connecting ring (6) is fixedly connected to a delivery rod (8). A filling hole (7) is provided at the connection between the balloon (5) and the outer tube (4). The surface of the delivery rod (8) is covered with a nylon resin sheath (9). The right end of the delivery rod (8) is bonded to a tube seat (11) by an adhesive (10). The adhesive (10) serves to bond the delivery rod (8) and the tube seat (11), and is a medical ultraviolet adhesive or instant adhesive. A male Luer (13) is installed at the right end of the tube seat (11), and a rotating fixed chuck (14) is installed at the right end of the male Luer (13). A supporting core wire (12) runs through the delivery rod (8).
2. The quick-exchange type extension catheter according to claim 1, characterized in that: The tube body head end (1) is made of a TPU material with sufficient toughness and has a length of 0.5-1 mm. The tube body head end (1) provides a flexible head end for the extension tube and is rounded.
3. The quick-exchange type extension catheter according to claim 1, characterized in that: The distal development mark (2) is a platinum-iridium alloy ring, the size of which matches the extension tube of the corresponding outer diameter, the wall thickness is 0.025-0.05 mm, and the length is 0.5-1.2 mm. The distal development mark (2) is used to display the position of the extension tube head end.
4. The quick-exchange type extension catheter according to claim 1, wherein: The intermediate reinforcement layer (3) is used to provide support for the outer tube (4), and the intermediate reinforcement layer (3) is a hypotube carved from a stainless steel tube, or a braided tube structure braided from nickel-titanium alloy or stainless steel wire, or a spring structure wound from nickel-titanium alloy wire or stainless steel wire, or a combination of a spring structure wound from nickel-titanium alloy wire or stainless steel wire with nickel-titanium at the left end and a braided tube structure at the right end; When the middle reinforcement layer (3) is cut as a hypotube, the wall thickness of the hypotube is 0.05-0.10 mm, the cutting gap at the left end of the hypotube is small, and the gap at the right end is large, and the overall cutting method is a gradual cutting method; When the middle reinforcing layer (3) is a braided tube structure, the braided wire of the braided tube is a round wire or a flat wire. When it is a round wire, the wire diameter ranges from 0.035 to 0.08 mm. When it is a flat wire, the wire thickness ranges from 0.02 to 0.05 mm and the wire width ranges from 0.05 to 0.15 mm. When the middle reinforcing layer (3) is wound with nickel-titanium alloy wire or stainless steel wire, the wire diameter is a round wire of 0.04-0.08 mm; When the middle reinforcing layer (3) is a combination of a spring structure with nickel-titanium wire or stainless steel wire wound around the left end and a braided tube structure at the right end, the left end is wound with a length of 5-15 cm and a round wire with a wire diameter of 0.04-0.08 mm. When the braided wire of the braided tube is a round wire, the wire diameter ranges from 0.035-0.08 mm. When it is a flat wire, the wire thickness is 0.02-0.05 mm and the wire width is 0.05-0.15 mm.
5. The quick-exchange type extension catheter according to claim 1, characterized in that: The outer tube (4) is a resin that is welded in multiple sections in sequence. From the left end to the right end of the outer tube (4), TPU hardness 45-80A and Pebax resin with gradually increased hardness of 35D-72D are selected, and the resin wall thickness is 0.05-0.075mm. The outer tube (4) functions to have a gradually changing hardness, with good flexibility at the left end and good support at the right end.
6. The quick-exchange type extension catheter according to claim 1, characterized in that: The balloon (5) is made of TPU or silicone or modified nylon. When the balloon (5) is made of TPU or silicone, the thickness of the balloon is 0.05-0.075 mm. When the balloon is made of modified nylon, the thickness of the balloon is 0.025-0.05 mm. The filled outer diameter of the balloon (5) can be varied within a range of 1 mm to 3 mm.
7. The quick-exchange type extension catheter according to claim 1, characterized in that: The connecting ring (6) is carved from a platinum-tungsten alloy or platinum-iridium alloy tube, and has a groove cut in the middle of the right end for connecting with the conveying rod (8). The connecting ring (6) and the conveying rod (8) are fixed by laser welding. The size of the connecting ring (6) matches the extension tube of the corresponding outer diameter, with a wall thickness of 0.025-0.05 mm and a length of 3-10 mm. The conveying rod (8) is made of a stainless steel tube for pushing and retracting the extension tube. The left end of the conveying rod (8) is ground with a gradual taper and then cut with a gradual spiral by laser. The conveying rod (8) is covered with a nylon resin sheath (9). The outer diameter of the pushing steel tube is 0.30-1.0 mm, the wall thickness is 0.025-0.1 mm, and the length is 150-180 cm.
8. The quick-exchange type extension catheter according to claim 1, wherein: The filling hole (7) is cut by laser, and the shape of the hole is oval or circular, the length of the hole is 1-2 mm, and the width is 1 / 3-1 / 2 of the left end diameter.
9. The quick-exchange type extension catheter according to claim 1, wherein: The resin sheath (9) is used to establish a stable and sealed channel for filling and depressurizing the balloon (5), and to fix the left end hypotube. The thickness of the resin sheath (9) is 0.05-0.1 mm.
10. The quick-exchange type extension catheter according to claim 1, wherein: The diameter of the support core wire (12) is 0.02 mm-0.05 mm smaller than the inner cavity of the delivery rod (8), and the length is 150-200 cm. The support core wire (12) is coated with a PTFE coating.