Medical indwelling catheter capable of being dredged

Abstract

The invention provides a medical indwelling catheter capable of being dredged. The medical indwelling catheter comprises a catheter body, an extrusion membrane cavity is formed in a cavity of the catheter body, the head end of the extrusion membrane cavity is a blind end at the head end of the catheter body, the tail end of the extrusion membrane cavity penetrates through the side wall of the catheter body at the tail of the catheter body and is communicated with a membrane cavity opening, and a filling opening pipe is communicated with the extrusion membrane cavity; the inner cavity of the catheter body is divided into a circulation cavity and an extrusion film cavity by the film wall of the extrusion film cavity; an inner cavity of the catheter body can be fully filled after the extrusion film cavity expands; the video line is in signal connection with the display screen out of the tail end of the catheter body; the head end bending adjusting rod is matched with an inner cavity of the extrusion film cavity; according to the visual lower catheter, fluid is injected and sucked into the extrusion film cavity, so that the extrusion film cavity expands, shrinks and extrudes, the circulation cavity is dredged, and the visual lower catheter is simple in structure, high in practicability, low in cost and high in clinical value.

Description

Technical Field

[0001] The invention relates to the field of medical devices, in particular to a medical catheter capable of being unblocked. Background Art

[0002] The insertion of body cavity drainage tubes is extremely common in internal and external medicine treatments. In surgery, it is mainly used to drain postoperative wound bleeding and exudate, while in internal medicine, it is mainly used to drain body cavity exudate. Poor drainage is extremely detrimental to recovery from the disease. It may lead to misjudgment of postoperative hemorrhage as normal drainage, delaying the patient's rescue opportunity and threatening the patient's life. It may also cause increased pressure in the drainage cavity, leading to critical illness. When necessary, the drainage tube needs to be removed and reinserted, increasing the patient's pain. The same is true for other body cavity tubes, such as nasogastric feeding tubes. Once a medical tube is blocked and cannot be cleared, not only will the original treatment plan be unable to continue, increasing the risk, but removing the tube and reinserting it will increase the patient's pain.

[0003] There is currently a lack of effective means to unclog medical catheters in the clinic. The main means of unclogging are:

[0004] 1. Squeeze method: squeeze the catheter from the proximal end to the distal end by hand. It is impossible to squeeze the lumen of the catheter body, the effect is poor, and it may also cause damage and rupture of the catheter;

[0005] 2. Flushing method: Open the distal opening of the catheter, use clean water to draw out and flush, and use water pressure to exert force on the blockage. When the blockage in the tube is long, the water pressure force area is only the end of one end of the blockage in the lumen, and the force area is small, so the effect is poor. Retrograde flushing from the distal end to the tube may cause retrograde infection.

[0006] 3. Rotation method: Rotate the part of the catheter outside the body to the left and right to loosen the adhesion between the blockage and the inner wall of the catheter. This method can only be used for the part outside the catheter, and the effect is very poor.

[0007] 4. Suction method: Use negative pressure to attract the tube body. When the blockage in the tube is long, the force-bearing area is only the end of one end of the blockage in the lumen. The force-bearing area is small and the effect is poor.

[0008] In order to improve drainage safety, there is an urgent need in clinical practice for a medical catheter that can be effectively unblocked at any time to ensure catheter patency and the effectiveness of medical catheter treatment. Summary of the invention

[0009] In view of the above-mentioned defects of the prior art, the present invention provides a medical catheter that can be unblocked, including a catheter body, wherein an adaptive extrusion membrane cavity is arranged along the long axis in the cavity of the catheter body; the head end of the extrusion membrane cavity is a blind end, which is arranged at the head end of the catheter body; a filling port tube is arranged on the tail side of the catheter body to connect the extrusion membrane cavity; the membrane wall of the extrusion membrane cavity separates the inner cavity of the catheter body into a flow cavity and an extrusion membrane cavity.

[0010] The extrusion membrane cavity is filled with a proper amount of fluid, and the fixed thick wall of the membrane cavity expands to fully fill the corresponding inner cavity of the catheter body; the fluid is fully drained from the extrusion membrane cavity, and the membrane wall of the extrusion membrane cavity collapses and is contained in the cavity of the catheter body.

[0011] Furthermore, the extrusion membrane cavity includes a cylindrical membrane arranged in the cavity of the catheter body, and the cross-sectional circumference of the cylindrical membrane is adapted to the cross-sectional circumference of the inner cavity of the catheter body; the head end of the cylindrical membrane is closed and bonded to the head end of the catheter body, and a membrane cavity opening is arranged through the tail side tube wall of the catheter body, and the tail end of the cylindrical membrane and the membrane cavity opening are annularly sealed and bonded; a filling port tube is arranged to connect the membrane cavity opening.

[0012] The membrane cavity opening is a round opening, which is matched with the size of the inner cavity of the catheter body, and the filling port tube is sealed and connected with the membrane cavity opening and temporarily fixed.

[0013] The extrusion membrane cavity and the catheter body are extruded or injection molded as one piece; one side wall of the extrusion membrane cavity is the side wall of the catheter body, forming a fixed thick wall of the membrane cavity; the other side wall of the extrusion membrane cavity is a long strip of shared deformable membrane wall, and the long sides of the shared deformable membrane wall and the fixed thick wall of the membrane cavity are extruded or injection molded as one piece; the sum of the cross-sectional widths of the shared deformable membrane wall and the fixed thick wall of the membrane cavity is matched with the circumference of the cross-sectional area of ​​the inner cavity of the catheter body, and the fixed thick wall of the extrusion membrane cavity and the shared deformable membrane wall are bonded closed at both ends.

[0014] A filling cavity is arranged along the long axis in the fixed thick wall of the membrane cavity; the head end of the filling cavity is closed, the head side of the filling cavity penetrates the inner side of the fixed thick wall of the membrane cavity and is connected with the extrusion membrane cavity, and the filling cavity penetrates the outer side of the tail of the fixed thick wall of the membrane cavity and is connected with the filling port pipe;

[0015] Alternatively, a membrane cavity opening is provided through the fixed thick wall of the membrane cavity, and a filling port pipe is provided in communication with the membrane cavity opening.

[0016] Alternatively, a filling cavity is arranged along the long axis inside the fixed thick wall of the membrane cavity; the head end of the filling cavity is closed, the head side of the filling cavity passes through the inner side of the fixed thick wall of the membrane cavity to be connected with the extrusion membrane cavity, and the filling cavity passes through the outer side of the tail of the fixed thick wall of the membrane cavity to be connected with the filling port tube; the filling cavity is isolated from the filling cavity, and a circular-mouthed membrane cavity port is arranged through the fixed thick wall of the membrane cavity, the size of the membrane cavity port and the inner cavity of the catheter body are matched, and a matching sealing body is arranged.

[0017] The filling port tube is matched with a gas filling and deflation device, including a syringe, an elastic bag or an air pump.

[0018] The gas charging and discharging device is configured as an air pump, including a charging pump and an air extraction pump, and is electrically connected to a controller to control the charging pump and the air extraction pump to work alternately at intervals.

[0019] An adapted puncture core is arranged in the circulation cavity, a puncture handle is arranged at the tail opening of the circulation cavity out of the puncture core, and a limiting body is arranged at the head side of the puncture handle.

[0020] A camera is embedded in the side wall of one side of the extrusion membrane cavity at the head end of the catheter body, and a camera video line is embedded in the side wall of the catheter body corresponding to the extrusion membrane cavity along the long axis of the catheter body. The camera video line passes through the tail side of the catheter body and is connected to a display screen.

[0021] A membrane cavity opening is arranged through the tail side wall of the catheter body and is adapted to the inner cavity of the catheter body;

[0022] A head end bending adjustment rod is provided; the head side of the head end bending adjustment rod is the adjustment rod, and the adjustment rod is adapted to the extrusion membrane cavity; the tail side of the head end bending adjustment rod is the adjustment handle, and the adjustment handle is controlled to change the curvature of the head section of the adjustment rod.

[0023] The catheter body has a developing line buried along the long axis of the catheter body in a side wall away from the extrusion membrane cavity; the catheter body head section has a drainage crack with a length of 30-200mm penetrating along the long axis at the side wall away from the extrusion membrane cavity.

[0024] Beneficial effects of the present invention:

[0025] 1. Fill the extrusion membrane cavity set in the catheter body cavity with suction fluid to break and clean the blockage in the catheter body cavity, and dredge the cavity and opening of the catheter body;

[0026] 2. Through the filling cavity setting, when the extrusion membrane cavity is filled with fluid, the extrusion membrane cavity expands to squeeze the inner cavity of the catheter body from the head end to the tail end, which is conducive to expelling the blockage fragments out of the catheter body cavity;

[0027] 3. When clearing the inner cavity and opening of the catheter body, there is no need to open the opening connecting the tail end of the catheter body and the body to avoid cross infection;

[0028] 4. The extrusion membrane cavity is set on one side of the side wall of the catheter body, which does not interfere with the other side wall to shear the new drainage inlet;

[0029] 5. Regularly clean the inner cavity of the catheter body through the inflation and deflation device to ensure patency;

[0030] 6. Use the camera to visualize the catheter placement and monitor the condition of the drainage cavity;

[0031] 7. By setting a membrane cavity port adapted to the inner cavity of the catheter body and cooperating with the head end bending adjustment rod, the curvature of the catheter head section can be adjusted by inserting it into the extrusion membrane cavity, thereby adjusting the observation angle of the camera;

[0032] 8. Insert the bending adjustment rod at the head end through the membrane cavity opening to squeeze the membrane cavity and isolate it from the inner cavity of the catheter body, so as to avoid contamination of the body cavity by the bending adjustment rod at the head end and avoid infection;

[0033] 9. Simple structure, low cost and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of two states of the extrusion membrane cavity of the first embodiment of the present invention;

[0035] Figure 2 Schematic diagram of two states of the extrusion membrane cavity in the second embodiment of the present invention;

[0036] Figure 3 Schematic diagram of two states of the extrusion membrane cavity of the third embodiment of the present invention;

[0037] Figure 4 Schematic diagram of two states of the extrusion membrane cavity according to the fourth embodiment of the present invention;

[0038] Figure 5 It is a schematic diagram of the air pump of the present invention;

[0039] Figure 6 This is a schematic diagram of the head end bending adjustment rod of the present invention;

[0040] In the figure,

[0041] 1. Flow cavity; 11. Development line; 12. Drainage slit; 2. Extrusion membrane cavity; 21. Filling port tube; 22. Cylindrical membrane; 23. Membrane cavity port; 24. Membrane cavity fixed thick wall; 25. Common deformable membrane wall; 26. Filling cavity; 3. Head end bending adjustment rod; 31. Adjustment rod; 32. Adjustment handle; air pump. DETAILED DESCRIPTION

[0042] In order to make the technical solution of the present invention better understood by the technical personnel in the field, and to make the above-mentioned features, purposes and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the embodiments. The embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0043] like Figure 1-4 As shown, the medical catheter that can be unblocked described in the present invention includes a catheter body, and an adaptive extrusion membrane cavity 2 is arranged along the long axis in the cavity of the catheter body; the head end of the extrusion membrane cavity 2 is a blind end, and is arranged at the head end of the catheter body; a filling port tube 21 is arranged on the tail side of the catheter body to connect the extrusion membrane cavity 2; the membrane wall of the extrusion membrane cavity 2 separates the inner cavity of the catheter body into a flow cavity 1 and an extrusion membrane cavity 2.

[0044] The extrusion membrane cavity 2 is filled with a proper amount of fluid, and the membrane wall of the extrusion membrane cavity 2 expands to fully fill the corresponding inner cavity of the catheter body; the extrusion membrane cavity 2 is fully drained of fluid, and the membrane wall of the extrusion membrane cavity 2 collapses and is contained in the cavity of the catheter body.

[0045] Figure 1-4Four different embodiments of the present invention are shown, wherein the upper figure of each figure is a schematic diagram of the treatment after the extrusion membrane cavity 2 is completely drained of the drainage fluid, and the lower figure of each figure is a schematic diagram after the extrusion membrane cavity 2 is filled with an appropriate amount of fluid, which will not be repeated below. The catheter body is a common medical catheter, which is a hollow tube. The specific size is set according to clinical needs, including drainage tubes, nasogastric tubes, gastric tubes, urinary catheters, etc. for internal and external surgery. The hollow lumen is used for liquid outflow or inflow, and needs to be kept unobstructed. However, during the circulation of liquid, the cavity is often blocked by solid blocks (mostly blood coagulation in the lumen or blood clots entering the lumen, or other fluid precipitation). These solid blocks are soft and can be easily broken after being subjected to force. In vitro, the blocks in the lumen of the catheter body are easily broken and removed by external force. However, since the catheter body is in the lumen part of the body, it is difficult to break and remove it regardless of whether negative pressure suction or positive pressure flushing is used because no force can be directly applied. The main reason is that the block in the lumen of the catheter body is similar in shape to the lumen and is stuck in the lumen of the catheter body in the shape of a long column. The friction force is spread over the entire outer surface of the long columnar blockage, while the negative pressure suction or positive pressure flushing force only acts on one end of the long columnar blockage. The force-bearing surface is extremely small, and it is difficult to shake the long columnar blockage stuck in the lumen.

[0046] The present invention includes a catheter body and an adapted extrusion membrane cavity 2 arranged along the long axis in the cavity of the catheter body (adaptation means that after the extrusion membrane cavity 2 is filled with an appropriate amount of gas, the membrane wall basically fills the inner cavity of the catheter body); the extrusion membrane cavity 2 can have a flexible membrane in all its walls, or a part of its walls, and the thickness of the flexible membrane should be controlled to be 10-50 filaments for best results, which can not only ensure deformation characteristics, but also maintain a certain toughness to avoid accidental damage, and also maintain a minimum cross-section, reducing the occupation of the flow cross-section of the inner cavity of the catheter body. The head end of the extrusion membrane cavity 2 is a blind end, fixedly arranged at the head end of the catheter body; the tail end of the extrusion membrane cavity 2 is blocked, and a filling port 21 is arranged on the side wall of the tail side of the catheter body to connect the extrusion membrane cavity 2. The membrane wall of the extrusion membrane cavity 2 divides the inner cavity of the catheter body into a flow cavity 1 and an extrusion membrane cavity 2. The extrusion membrane cavity 2 is substantially equal in length to the catheter body, and the membrane wall of the extrusion membrane cavity 2 can substantially fill the inner cavity of the catheter body after expansion, so that the flow cavity 1 is compressed and collapsed. During normal use, the extruded membrane cavity 2 contained in the lumen of the catheter body is in a completely collapsed state, the membrane wall of the extruded membrane cavity 2 is fully stretched along the long axis of the catheter body without obvious bending or folding, and the cross-section of the extruded membrane cavity 2 after collapse preferably accounts for 2%-10% of the cross-section of the inner lumen of the catheter body.

[0047] When the lumen of the catheter body is blocked, firstly, a proper amount of fluid is filled into the extrusion membrane cavity 2 through the filling port tube 21, the fluid pressure in the extrusion membrane cavity 2 increases, the cavity wall expands, the volume of the extrusion membrane cavity 2 increases, and finally the entire corresponding catheter body lumen is fully filled. The membrane wall of the extrusion membrane cavity 2 squeezes the side wall of the flow cavity 1 in the catheter body, and the long columnar blockage in the flow cavity 1 of the catheter body is compressed from the side, so that the blockage is broken by the positive pressure; then, the fluid is fully pumped out of the extrusion membrane cavity 2 through the filling port tube 21, the fluid in the extrusion membrane cavity 2 is reduced, the pressure drops, and the extrusion membrane cavity 2 is fully pumped out. The wall of the squeeze membrane cavity 2 shrinks, the volume of the squeeze membrane cavity 2 decreases, and finally the collapsed volume of the wall of the squeeze membrane cavity 2 is reduced to the limit, so that the volume of the flow cavity 1 of the catheter body increases, and a short negative pressure is generated, which forms a short negative pressure from the side on the blockage in the flow cavity 1, so that the blockage is broken by the negative force; the squeeze membrane cavity 2 is repeatedly and alternately filled and sucked through the filling port tube 21, so that the blockage in the flow cavity 1 is repeatedly and alternately subjected to positive and negative forces, and finally broken into pieces, and is sucked out under the negative pressure of the tail cavity port connected to the flow cavity 1 of the catheter body. After the flow cavity 1 of the catheter body is unblocked, the fluid in the squeeze membrane cavity 2 is exhausted through the filling port tube 21, and the squeeze membrane cavity 2 is maintained in a completely collapsed state, and the flow cavity 1 of the catheter body is restored to its maximum, and can continue to enter the use state.

[0048] It should be noted that the catheter body and the membrane wall of the extrusion membrane cavity 2 of the present invention are preferably made of the same medical material with flexible material, such as silicone, PVC, etc. Before use, the volume of the inner cavity of the catheter body corresponding to the extrusion membrane cavity 2 should be fully understood. When the extrusion membrane cavity 2 is filled with fluid to clear the inner cavity of the catheter body, the volume of the filled fluid should be consistent with the volume of the inner cavity of the catheter body. The inner cavity volume is V=πr 2 l (r is the radius of the cross section of the inner cavity of the catheter body; l is the length of the catheter body; π is the circumference of a circle). If liquid is filled, the amount of liquid should not exceed the volume of the inner cavity of the catheter body corresponding to the extrusion membrane cavity 2; if gas is filled, considering the compressibility of gas, the amount of gas filled can be slightly larger than the volume of the inner cavity of the catheter body corresponding to the extrusion membrane cavity 2, but not too much, so as to avoid expansion and rupture of the membrane wall of the extrusion membrane cavity 2. Specific products should be accurately tested, and the maximum capacity of gas or liquid filled should be indicated in the product manual.

[0049] Further, such as Figure 1As shown, the extrusion membrane cavity 2 includes a cylindrical membrane 22 arranged in the cavity of the catheter body. The cylindrical membrane 22 divides the inner cavity of the catheter body into a flow cavity 1 and an extrusion membrane cavity 2 distributed inside and outside. The inner cavity of the catheter body is essentially the flow cavity 1, and the extrusion membrane cavity 2 is located in the flow cavity 1. The cross-sectional circumference of the cylindrical membrane 22 is adapted to the cross-sectional circumference of the inner cavity of the catheter body; the head end of the cylindrical membrane 22 is closed and bonded and fixed to the head end of the catheter body, and a membrane cavity opening 23 is set through the tail side tube wall of the catheter body. The tail end of the cylindrical membrane 22 and the membrane cavity opening 23 are annularly sealed and bonded and fixed; a filling port tube 21 is provided to connect the membrane cavity opening 23. Similarly, the length and thickness of the cylindrical membrane 22 should be adapted to the inner cavity of the catheter body (i.e., the flow cavity 1). The cylindrical membrane 22 should be made of a thinner flexible material, and the wall thickness is preferably 10-50 filaments. The cylindrical membrane 22 should be stretched when bonded and fixed in the cavity of the catheter body, and no bending or folding should occur in the long axis direction. Its working principle is consistent with the above principle. In the drainage state, the fluid in the tubular membrane 22 should be sucked out to keep it in a collapsed state, which will not be described in detail here.

[0050] Further, such as Figure 1 As shown, the membrane cavity opening 23 is a round opening, which is adapted to the size of the inner cavity of the catheter body, and the filling port tube 21 is sealed and connected to the membrane cavity opening 23 and temporarily fixed. Its purpose is:

[0051] 1. In general, the filling port tube 21 is sealed and connected to the membrane cavity port 23, and the above method can be used to alternately fill and drain the tubular membrane 22 to clear the flow cavity 1 in the catheter body;

[0052] 2. The membrane cavity opening 23 is a circular opening that matches the size of the inner cavity of the catheter body. The tubular membrane 22 as a whole forms a blind cavity with a blind end at the head end of the catheter body and an opening at the membrane cavity opening 23 at the tail side of the catheter body. The inner cavity of the tubular membrane 22 is isolated from the circulation cavity 1. Operations in the blind cavity of the tubular membrane 22 will not cause contamination of the inner cavity of the circulation cavity 1. When it is necessary to dredge the long columnar blockages in the circulation cavity 1 that are difficult to break, the filling port tube 21 temporarily fixedly connected outside the membrane cavity opening 23 can be opened. The membrane cavity opening 23 is located outside the body. A stick with a certain hardness is inserted through the membrane cavity opening 23. Under the isolation of the membrane wall of the tubular membrane 22, the blockages in the circulation cavity 1 of the catheter body are directly stirred and broken to achieve the purpose of dredging. 3. When necessary, a visual rod can be inserted through the membrane cavity opening 23 to directly observe the shape and position of the blockages in the circulation cavity 1 through the transparent membrane wall of the tubular membrane 22 to assist in judging the condition.

[0053] Further, such as Figure 2As shown, the extrusion membrane cavity 2 and the catheter body are extruded or injection molded as one piece; one side wall of the extrusion membrane cavity 2 is the side wall of the catheter body, forming a membrane cavity fixed thick wall 24; the other side wall of the extrusion membrane cavity 2 is a long sheet-shaped common deformable membrane wall 25, and the long sides of the common deformable membrane wall 25 and the membrane cavity fixed thick wall 24 are extruded or injection molded as one piece; the common deformable membrane wall 25 separates the extended axis of the catheter body into the flow cavity 1 and the extrusion membrane cavity 2. The sum of the cross-sectional widths of the common deformable membrane wall 25 and the membrane cavity fixed thick wall 24 is adapted to the circumference of the cross-sectional area of ​​the inner cavity of the catheter body, and the membrane cavity fixed thick wall 24 and the common deformable membrane wall 25 are bonded and closed at both ends. This is an optimal structure. The catheter body is extruded into a single-tube dual-lumen structure, one of which is a flow cavity 1, which is a fluid channel actually used by the catheter body, such as drainage, injection of nutrient solution, etc. The other cavity is the extrusion membrane cavity 2 of the present invention, which is used to fill the suction fluid to dredge the flow cavity 1 of the catheter body. In the middle of the catheter body, the adjacent walls of the flow cavity 1 and the extrusion membrane cavity 2 are shared, which is a thinner shared deformable membrane wall 25, with a thickness of 10-50 mm being the best. The catheter body wall is divided into two parts by the shared deformable membrane wall 25, which is thicker and not easy to deform, with a thickness of 1-2 mm being the best, and they respectively form the lumens of the flow cavity 1 and the extrusion membrane cavity 2 with the shared deformable membrane wall 25. When dredging the flow cavity 1, the shared deformable membrane wall 25 bears the role of expansion and extrusion, contraction and pulling, and repeatedly slapping the blockage in the flow cavity 1. The catheter body wall forming one side of the extrusion membrane cavity 2 is the membrane cavity fixed thick wall 24, which supports the shape of the catheter body and fixes the common deformable membrane wall 25, keeping the common deformable membrane wall 25 straight and relaxed in the catheter body.

[0054] The fixed thick wall 24 of the membrane cavity and the shared deformable membrane wall 25 are sealed and closed at both ends of the catheter body to form a blind tube-shaped extrusion membrane cavity 2. The extrusion membrane cavity 2 is filled or drained with fluid through the filling port 21, so that the shared deformable membrane wall 25 beats and pulls the blockage in the circulation cavity 1, thereby clearing the inner cavity of the circulation cavity 1. In the working state, the fluid in the extrusion membrane cavity 2 should be evacuated and maintained in its collapsed state, so that the shared deformable membrane wall 25 is tightly attached to the fixed thick wall 24 of the membrane cavity to keep the circulation cavity 1 unobstructed and ensure the drainage effect. In the specific implementation, in the cross section of the catheter body, the fixed thick wall 24 of the membrane cavity and the shared deformable membrane wall 25 should each occupy half of its circumference, so as to make full use of the space in the cavity of the catheter body and completely avoid the shared deformable membrane wall 25 from being too much and causing bending and folding, or being insufficient in length, and being damaged by excessive force when expanding.

[0055] Further, such as Figure 3As shown, a filling cavity 26 is arranged along the long axis in the fixed thick wall 24 of the membrane cavity; the head end of the filling cavity 26 is closed, the head side of the filling cavity 26 passes through the inner side of the fixed thick wall 24 of the membrane cavity to communicate with the extrusion membrane cavity 2, and the filling cavity 26 passes through the outer side of the tail of the fixed thick wall 24 of the membrane cavity to communicate with the filling port tube 21. The filling cavity 26 is buried in the fixed thick wall 24 of the membrane cavity, and except for the head end of the filling cavity 26 which is connected with the extrusion membrane cavity 2, the other parts are isolated by the fixed thick wall 24 of the membrane cavity inside the filling cavity 26 and are not connected with the extrusion membrane cavity 2. The filling cavity 26 at the head end of the catheter body is sealed to form a blind end, and the filling cavity 26 passes through the outer side of the fixed thick wall 24 of the membrane cavity on the tail side of the catheter body to arrange the filling port tube 21.

[0056] The extrusion membrane cavity 2 is filled with fluid through the filling port tube 21, and the fluid flows through the filling cavity 26 buried in the fixed thick wall 24 of the membrane cavity to the head side of the fixed thick wall 24 of the membrane cavity, and then returns to the extrusion membrane cavity 2, so that the fluid in the extrusion membrane cavity 2 increases and expands, and the common deformable membrane wall 25 expands and deforms toward the inner cavity of the catheter body, compressing the flow cavity 1, and finally adheres to the inner wall of the catheter body on one side of the flow cavity 1, and the blockage in the flow cavity 1 is beaten, squeezed and broken; the fluid is sucked out of the extrusion membrane cavity 2 through the filling port tube 21, and the fluid in the extrusion membrane cavity 2 enters the filling cavity 26 through the filling cavity 26 on the head side of the fixed thick wall 24 of the membrane cavity and the connecting port of the extrusion membrane cavity 2, and is sucked out, so that the fluid in the extrusion membrane cavity 2 decreases and collapses, and the common deformable membrane wall 25 adheres to the fixed thick wall 24 of the membrane cavity, and finally adheres to the fixed thick wall 24 of the membrane cavity, and the blockage in the flow cavity 1 is pulled and broken. Its significance is:

[0057] 1. The fluid filling inlet of the extrusion membrane cavity 2 is on the head side of the catheter body, so that when the extrusion membrane cavity 2 expands, it forms an effect of squeezing from the head side to the tail side of the flow cavity 1, which has the effect of pushing the blockage in the flow cavity 1 to the opening outside the body, which is conducive to the discharge of the blockage fragments, reduces the retrograde entry of the blockage fragments into the deep of the catheter body, and reduces the possibility of re-blockage.

[0058] 2. The fluid discharge port of the extrusion membrane cavity 2 is also on the head side of the catheter body, so that when the extrusion membrane cavity 2 collapses, it is pulled from the head side to the tail side of the flow cavity 1. Because the tail of the flow cavity 1 is mostly provided with a one-way valve pointing outside the body, it has the effect of sucking the blockage at the opening of the flow cavity 1 into the lumen, which is beneficial to breaking the blockage outside the opening of the flow cavity 1 and sucking it into the flow cavity 1, and has an oscillation and destruction effect on the blockage outside the opening of the flow cavity 1 in the body, so that the opening of the flow cavity 1 is restored to be unobstructed.

[0059] or, as Figure 2 As shown, a membrane cavity opening 23 is set through the membrane cavity fixed thick wall 24, and the membrane cavity opening 23 should be adapted to the size of the inner cavity of the catheter body, and a filling port tube 21 is set in communication with the membrane cavity opening 23. Figure 1 The plans are similar and will not be repeated here.

[0060] Or, refer to Figure 4 As shown, a filling cavity 26 is arranged along the long axis in the membrane cavity fixed thick wall 24; the filling cavity 26 is closed at the head end, and the head side of the filling cavity 26 passes through the inner side of the membrane cavity fixed thick wall 24 to communicate with the extrusion membrane cavity 2, and the filling cavity 26 passes through the outer side of the tail of the membrane cavity fixed thick wall 24 to communicate with the filling port tube 21; the filling cavity 26 is isolated, and a circular membrane cavity port 23 is arranged through the membrane cavity fixed thick wall 24, and the membrane cavity port 23 and the inner cavity of the catheter body are adapted in size, and a matching sealing body is arranged. This is Figure 3 The scheme adds a membrane cavity opening 23 and a matching sealing body structure. Figure 3 The advantages of the filling chamber 26 in the scheme also retain the Figure 1 The advantageous effects of the membrane cavity opening 23 in the solution will not be described in detail here.

[0061] Furthermore, the filling port tube 21 is matched with a gas filling and deflation device, including a syringe, an elastic bag or an air pump. The gas filling and deflation device makes it more convenient to fill and suck the extrusion membrane cavity 2 through the filling port tube 21, and facilitates the dredging of the circulation cavity 1 at any time.

[0062] Further, such as Figure 5 As shown, the inflation and deflation device is set as an air pump, including a filling pump and an air extraction pump, and is electrically connected to set a controller to control the filling pump and the air extraction pump to work alternately at intervals. It is very important to keep the circulation cavity 1 unobstructed, especially after some major operations, it must be suitable to keep the drainage unobstructed, and it cannot be unblocked until the circulation cavity 1 is completely blocked. When the drainage starts after such an operation (such as heart, lung transplantation, esophageal, and liver transplantation), the circulation cavity 1 can be regularly unblocked and managed, and the filling pump and the air extraction pump are controlled by the controller to work alternately at regular intervals, so that the circulation cavity 1 can be kept unobstructed at any time. Specifically, when the drainage is implemented, the air extraction pump continues to work to keep the squeeze membrane cavity 2 in a collapsed state, so that the circulation cavity 1 is not squeezed and occupied, and the circulation cavity 1 enters the drainage state. After 60 minutes, the filling pump and the air extraction pump start to work alternately at intervals of 30-60 times / min in the unobstructed maintenance state, and enter the drainage state again after 5 minutes for 60 minutes, and so on. Repeated cycles completely avoid blockage of the circulation cavity 1 lumen and always maintain the circulation cavity 1 unobstructed.

[0063] Furthermore, a suitable puncture core is arranged in the circulation cavity 1, a puncture handle is arranged at the tail opening of the puncture core out of the circulation cavity 1, and a limiter is arranged at the head side of the puncture handle. The arrangement of the puncture core makes it extremely convenient to puncture and drain patients with pneumothorax, pleural effusion, and ascites, avoiding excessive damage to the incision during incision catheterization, and avoiding the occurrence of incision exudation and air leakage, which has been applied in clinical practice and will not be described in detail.

[0064] Furthermore, a camera is embedded in the side wall of the extrusion membrane cavity 2 at the head end of the catheter body, and a camera video line is embedded in the side wall of the catheter body corresponding to the extrusion membrane cavity 2 along the long axis of the catheter body, and the camera video line passes through the tail side of the catheter body to connect the signal to set a display screen. Through the setting of the camera, video line and display screen, the drainage is visualized, which is convenient for observing the condition of the drainage site and the major changes in the position of the catheter body head end and readjusting the position, which is conducive to improving the drainage treatment effect. Of course, a flushing port should be set at the corresponding camera position. When the camera is contaminated, sterile saline is injected to maintain the camera clear and visible. This is a transfer of common clinical technology and will not be repeated.

[0065] The camera and video line are buried in the side wall of the extruded membrane cavity 2 of the catheter body. The purpose is: when the flow cavity 1 is in use, it is often necessary to cut holes in the wall of different parts to increase the opening. Obviously, the video line and the extruded membrane cavity 2 must not be damaged when cutting holes. The video line and the extruded membrane cavity 2 are located on the same side wall of the catheter body, and the other side wall has no special structure, which is only the side wall of the flow cavity 1. Cutting holes in this part can avoid damage to the video line and the extruded membrane cavity 2.

[0066] Further, such as Figure 1 , 2 As shown in 4, a membrane cavity opening 23 is arranged on the tail side wall of the catheter body and is adapted to the inner cavity of the catheter body. Its clinical significance has been described and will not be repeated here.

[0067] like Figure 6 As shown, the present invention also provides a head end bending adjustment rod 3; the head side of the head end bending adjustment rod 3 is an adjustment rod 31, and the adjustment rod 31 is adapted to the length and inner cavity of the extrusion membrane cavity 2; the tail side of the head end bending adjustment rod 3 is an adjustment handle 32, and the adjustment handle 32 is controlled to change the curvature of the head section of the adjustment rod 31. This structure should be set simultaneously with the camera and the membrane cavity port 23, and its purpose is: when it is necessary to adjust the observation angle of the camera at the head end of the catheter body, remove the sealing body or the filling port tube 21 on the circular membrane cavity port 23, and place the adjustment rod 31 of the head end bending adjustment rod 3 through the membrane cavity port 23 into the extrusion membrane cavity 2 until the head end of the adjustment rod 31 reaches the head end of the extrusion membrane cavity 2. At this time, the adjustment handle 32 can be held to adjust the curvature of the head section of the adjustment rod 31, thereby adjusting the curvature of the head end of the catheter body and adjusting the observation angle of the camera. In accordance with this, the adjustment rod 31 should be adapted to the size of the inner cavity of the extrusion membrane cavity 2 and have a certain supporting force. The head end bending adjustment rod 3 is a common structure in medical endoscopes and will not be repeated.

[0068] Further, such as Figure 4As shown, the catheter body is embedded with a developing line 11 along the long axis of the catheter body in the side wall away from the extrusion membrane cavity 2; the catheter body head section is provided with a drainage slit 12 with a length of 30-200mm along the long axis at the side wall away from the extrusion membrane cavity 2. The setting of the developing line 11 facilitates the positioning of the catheter body in the body by X-ray filming when necessary. The developing line 11 is set on the side wall of the catheter body away from the extrusion membrane cavity 2. When a shearing hole is added to the drainage cavity 1, the shearing hole can just cut off the developing line 11, forming a defect on the developing line 11. When X-ray filming is taken, the position of the shearing hole can be judged by the defect position of the developing line on the X-ray. The drainage slit 12 with a length of 30-200mm is set at the side wall away from the extrusion membrane cavity 2 along the long axis of the catheter body head section, which can increase the drainage inlet area of ​​the head end of the circulation cavity 1, making the gas or liquid drainage more unobstructed. These structures are of great significance in postoperative drainage of the thoracic and abdominal cavities.

[0069] The above embodiments are merely illustrative of the principles and effects of this patent application, and are not intended to limit this patent application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. It can dredge medical catheters, and its characteristics are: The invention comprises a catheter body, wherein an adapted extrusion membrane cavity (2) is arranged along the long axis in the cavity of the catheter body; the head end of the extrusion membrane cavity (2) is a blind end and is arranged at the head end of the catheter body; a filling port tube (21) is arranged at the tail side of the catheter body to communicate with the extrusion membrane cavity (2); the membrane wall of the extrusion membrane cavity (2) separates the cavity of the catheter body into a flow cavity (1) and an extrusion membrane cavity (2); The extrusion membrane cavity (2) is filled with a suitable amount of fluid, and the membrane wall of the extrusion membrane cavity (2) expands to fully fill the corresponding inner cavity of the catheter body; the fluid is fully drained from the extrusion membrane cavity (2), and the membrane wall of the extrusion membrane cavity (2) collapses and is contained in the cavity of the catheter body.

2. The medical catheter capable of being unblocked according to claim 1, characterized in that: The extrusion membrane cavity (2) comprises a cylindrical membrane (22) arranged in the cavity of the catheter body, the cross-sectional circumference of the cylindrical membrane (22) is adapted to the cross-sectional circumference of the inner cavity of the catheter body; the head end of the cylindrical membrane (22) is closed and bonded to the head end of the catheter body, a membrane cavity opening (23) is arranged through the rear wall of the catheter body, the rear end of the cylindrical membrane (22) and the membrane cavity opening (23) are annularly sealed and bonded; a filling port tube (21) is arranged to communicate with the membrane cavity opening (23).

3. The medical catheter capable of being unblocked according to claim 2, characterized in that: The membrane cavity opening (23) is a circular opening, which is adapted to the size of the inner cavity of the catheter body, and the filling port tube (21) is sealed and connected to the membrane cavity opening (23) and temporarily fixed.

4. The medical catheter capable of being unblocked according to claim 1, characterized in that: The extruded membrane cavity (2) and the catheter body are extruded or injection molded as one piece; one side wall of the extruded membrane cavity (2) is the side wall of the catheter body, forming a membrane cavity fixed thick wall (24); the other side wall of the extruded membrane cavity (2) is a long sheet-shaped shared deformable membrane wall (25), and the long sides of the shared deformable membrane wall (25) and the membrane cavity fixed thick wall (24) are extruded or injection molded as one piece; the sum of the cross-sectional widths of the shared deformable membrane wall (25) and the membrane cavity fixed thick wall (24) is adapted to the circumference of the cross-sectional area of ​​the inner cavity of the catheter body, and the head and tail ends of the membrane cavity fixed thick wall (24) and the shared deformable membrane wall (25) are respectively bonded closed.

5. The medical catheter capable of being unblocked according to claim 4, characterized in that: A filling cavity (26) is arranged along the long axis of the membrane cavity fixed thick wall (24); the head end of the filling cavity (26) is closed, the head side of the filling cavity (26) penetrates the inner side of the membrane cavity fixed thick wall (24) and is connected with the extrusion membrane cavity (2), and the filling cavity (26) penetrates the outer side of the tail of the membrane cavity fixed thick wall (24) and is connected with the filling port tube (21); Alternatively, a membrane cavity opening (23) is provided through the membrane cavity fixed thick wall (24), and a filling port pipe (21) is provided in communication with the membrane cavity opening (23). Alternatively, a filling cavity (26) is arranged along the long axis of the fixed thick wall (24) of the membrane cavity; the head end of the filling cavity (26) is closed, the head side of the filling cavity (26) passes through the inner side of the fixed thick wall (24) of the membrane cavity to communicate with the extrusion membrane cavity (2), and the filling cavity (26) passes through the outer side of the tail of the fixed thick wall (24) of the membrane cavity to communicate with the filling port tube (21); the filling cavity is isolated from the filling cavity (26), and a circular-mouthed membrane cavity port (23) is arranged through the fixed thick wall (24) of the membrane cavity, the membrane cavity port (23) and the inner cavity of the catheter body are matched in size, and a matching sealing body is provided.

6. The medical catheter capable of being unblocked according to claim 1, characterized in that: The filling port tube (21) is matched with a gas filling and deflation device, including a syringe, an elastic bag or an air pump.

7. The medical catheter capable of being unblocked according to claim 6, characterized in that: The gas charging and discharging device is configured as an air pump, including a charging pump and an air extraction pump, and is electrically connected to a controller to control the charging pump and the air extraction pump to work alternately at intervals.

8. The medical catheter capable of being unblocked according to claim 1, characterized in that: An adapted puncture core is arranged in the circulation cavity (1), a puncture handle is arranged at the tail opening of the puncture core out of the circulation cavity (1), and a limiting body is arranged at the head side of the puncture handle.

9. The medical catheter capable of being unblocked according to claim 1, characterized in that: A camera is embedded in the side wall of one side of the extrusion membrane cavity (2) at the head end of the catheter body, and a camera video line is embedded in the side wall of the catheter body corresponding to the extrusion membrane cavity (2) along the long axis of the catheter body. The camera video line passes through the tail side of the catheter body and a signal connection display is set.

10. The medical catheter capable of being unblocked according to claim 3 or 5, characterized in that: A membrane cavity opening (23) is arranged through the tail side wall of the catheter body and is adapted to the inner cavity of the catheter body; A head end bending adjustment rod (3) is provided; the head side of the head end bending adjustment rod (3) is an adjustment rod (31), and the adjustment rod (31) is adapted to the extrusion membrane cavity (2); the tail side of the head end bending adjustment rod (3) is an adjustment handle (32), and the adjustment handle (32) is controlled to change the curvature of the head section of the adjustment rod (31).

11. The medical catheter capable of being unblocked according to claim 1, characterized in that: A developing line (11) is embedded in a wall of the catheter body along a side away from the extrusion membrane cavity (2) and along the long axis of the catheter body; The catheter body head section is provided with a drainage slit (12) with a length of 30-200 mm penetrating along the long axis at the side wall away from the extrusion membrane cavity (2).

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