225 results about "Catheter sheath" patented technology

The invention relates to the technical field of medical equipment, in particular to a bidirectional bending-adjustable handle and a bending-adjustable catheter sheath, the medical equipment comprises an adjusting tube, a restraint plate, a pull rope, an adjusting handle, a pushing block and a bending tube sleeve; an operator pulls different pull ropes to enable the adjusting tube to be bent at different positions, so that in the using process of the adjusting tube, even if the adjusting tube is inserted into a branch blood vessel in a staggered mode, the adjusting tube can exit from selection again and then is adjusted to a correct path; the adjusting handle can bend the adjusting pipe in different directions by controlling the rotating direction of the adjusting ring, control and adjustment of bending of the front section of the adjusting pipe are achieved, good practicability and economical efficiency are achieved, and application and popularization of equipment are facilitated.

A catheter configured for placement within a bodily lumen, comprises: a catheter sheath defining a first lumen for medical tools; and an exchange segment defining a second lumen for a guidewire. A proximal end of the exchange segment is joined with a distal end of the catheter sheath in a lengthwise direction forming an angle therebetween, such that the second lumen is laterally offset by a distance and angled with respect to the first lumen. When the catheter is placed within a patient's anatomy, the catheter sheath and / or the exchange segment straightens out so that the axis of the second lumen and the axis of the first lumen become substantially parallel to each other. The offset distance between the axes of sheath and exchange segment depends mainly on the diameter of the guidewire to be used, on the diameter of the sheath, and the angle of the junction.

The utility model is suitable for the technical field related to medical instruments, and provides a valve auxiliary system sheath which comprises a shell assembly and a catheter sheath tube arranged on the shell assembly. The bending adjusting handle is used for adjusting the angle of the tail end of the catheter sheathing canal, and the bending adjusting handle is connected with the shell assembly; the catheter sheath is used for being matched with the catheter sheath tube to achieve introduction of an interventional instrument or conveying of an auxiliary instrument; the flushing valve is used for conveying medicaments, and the flushing valve is communicated with the catheter sheath through an extension tube body; the catheter sheath tube, the catheter sheath, the flushing valve and other components are arranged in a matched mode, so that the dilator can be always kept in the catheter sheath tube in the original position in the process that the catheter sheath tube enters the access blood vessel of a patient, blood cannot permeate out of a product, use is convenient, and the valve positioning accuracy and the operation safety are effectively improved.

The invention discloses a guide wire and catheter exchange blood vessel interventional instrument which comprises a catheter sheath assembly, a puncture needle, a guide wire and a catheter, and belongs to the field of medical instruments. Wherein the catheter sheath assembly is composed of an outer sheath tube and an expansion tube, the far ends of the outer sheath tube and the expansion tube are provided with gradient transition structures, and puncture resistance can be reduced; an exchange connector is arranged at the near end of the outer sheathing canal, an asymmetric structure is arranged in the outer sheathing canal, blood flowing resistance is increased, and when the outer sheathing canal works, through cooperation of all parts, the catheter is fed in the process of retracting the expansion tube, the tearable sheathing canal is blocked in advance, and intraoperative bleeding is reduced. The invention further provides a preparation method of the tearable sheathing canal, the axial pressure resistance, tearability and surface smoothness of the tearable sheathing canal can be adjusted by controlling the raw material ratio, the molecular weight and the processing technology, thrust is provided for clinical puncture, and puncture resistance is reduced; the tearable sheathing canal can reduce the displacement of the catheter after the catheter is indwelled; the expansion tube, the guide wire and the catheter are provided with identification points, and medical operation is facilitated.

The invention discloses an intravascular adjustable ultrasonic real-time navigation TIPS puncture instrument, and relates to the technical field of medical devices, the intravascular adjustable ultrasonic real-time navigation TIPS puncture instrument comprises a catheter sheath, a core-through needle catheter, a hollow core-through needle and a solid core-through needle; the core-through needle catheter penetrates through the interior of the catheter sheath; an operating handle is arranged at one end of the through core needle catheter, a traction mechanism is installed on the operating handle, and a pull wire is arranged in the catheter sheath. Real-time ultrasonic images are obtained through the ultrasonic probe, so that an operator can clearly see a needle point path, and key organs such as hepatic artery, bile duct and gall bladder are effectively avoided. The bending-adjustable puncture needle provides the capability of real-time correction in an operation, can easily cope with complex anatomical variation, can keep certain rigidity through the hardness adjusting chain after bending adjustment, improves the penetrating power of the puncture needle, prevents unpredictable mechanical deformation during liver cirrhosis liver puncture, enhances the controllability after bending adjustment, and improves the safety of liver cirrhosis. And accurate execution of the preset angle is ensured.

The sheathing canal with the adjustable pipe diameter comprises a catheter sheath, a connecting pipe and a blood vessel sheath which are sequentially connected to form a channel, the blood vessel sheath comprises a valve body and an adjusting device, the valve body comprises an annular pipe made of an elastic material and a circular truncated cone pipe made of a rigid material, the annular pipe is composed of a plurality of tubular units, and protruding sliding rails are arranged on the tubular units; the circular truncated cone pipe is provided with a sliding groove in the direction of the sliding rail, a connecting ring used for being connected with the sliding rail is arranged between the annular pipe and the circular truncated cone pipe, the connecting ring is an unclosed circular ring, the adjusting device is connected with the connecting ring and penetrates through the sliding groove, and the adjusting device can slide in the direction of the sliding groove. The valve body comprises the annular pipe and the circular truncated cone pipe, the unclosed connecting ring is arranged between the annular pipe and the circular truncated cone pipe, the sliding groove is formed in the circular truncated cone pipe, and the adjusting device is connected with the connecting ring and penetrates through the sliding groove, so that the adjusting device can slide in the direction of the sliding groove, the connecting ring is driven to slide, and finally the pipe diameter of the annular pipe is changed.

A catheter assembly for performing a thrombectomy and methods of use, the catheter assembly including a catheter sheath and a dilation and capture assembly slidably positioned within the catheter sheath. The dilation and capture assembly includes a catheter having a balloon portion at a distal end of the catheter, and a retrieval basket. The balloon portion is selectively inflatable and deflatable between respectively a maceration orientation and a delivery orientation. The retrieval basket is deployable from a delivery configuration mounted to the balloon portion and a retrieving configuration axially displaced from the distal end of the catheter.

A retainer system includes a catheter tube, a bifurcation, a drainage extension leg and an inflation extension leg. The system can also include an anchor pad and a retainer rotatably coupled to a top surface of the anchor pad. The retainer can include a base and a cap hingedly coupled to the base. Additionally, the retainer can feature one or more extension leg sleeves with a lumen, extending from the first side of the retainer, and a catheter tube sleeve with a lumen, extending from the second side of the retainer. The sleeve can define a serpentine shape to impart a predetermined amount of slack on the catheter and mitigate dislodgement of the catheter distal tip when the retainer system moves relative thereto. Further, the retainer system can mitigate kinking or collapse of the catheter by providing strain relief between the catheter and the retainer system.

The application relates to a rotary cutting type myocardial biopsy forceps, which comprises a sleeve assembly, a catheter and a handle assembly, the distal end of the handle assembly is connected with the proximal end of the catheter, and the distal end of the catheter is connected with the sleeve assembly; the sleeve assembly comprises a sleeve body, the proximal end of the sleeve body is connected with the catheter, the distal end of the sleeve body is provided with an open port, the inside of the sleeve body is slidably provided with a rotary cutting knife, the inside of the catheter is provided with a first driving member, the handle assembly is drivingly connected with the rotary cutting knife through the first driving member, so as to drive the rotary cutting knife to extend out of the sleeve body and cut myocardial tissue; the distal end of the sleeve body is movably provided with a closing assembly, the inside of the catheter is provided with a second driving member, the handle assembly is drivingly connected with the closing assembly through the second driving member, so as to control the closing assembly to selectively open or close the open port at the distal end of the sleeve body. The rotary cutting type myocardial biopsy forceps can accurately control the sampling depth, and the open port at the distal end of the sleeve body can be closed after sampling, so that myocardial cells are prevented from falling off.

The rotary cutting type myocardial biopsy forceps comprise a sleeve assembly, a catheter and a handle assembly, the far end of the handle assembly is connected with the near end of the catheter, and the far end of the catheter is connected with the sleeve assembly; the sleeve assembly comprises a sleeve body, the near end of the sleeve body is connected with the catheter, the far end of the sleeve body is provided with an opening, a rotary cutter is slidably arranged in the sleeve body, a first driving part is arranged in the catheter, and the handle assembly is in driving connection with the rotary cutter through the first driving part and used for driving the rotary cutter to stretch out of the sleeve body. The cardiac muscle tissue is subjected to rotary cutting; a closing assembly is movably arranged at the far end of the sleeve body, a second driving part is arranged in the catheter, and the handle assembly is in driving connection with the closing assembly through the second driving part and used for controlling the closing assembly to selectively open or close an opening in the far end of the sleeve body. The rotary cutting type myocardial biopsy forceps can accurately control the sampling depth, and the opening in the far end of the sleeve body can be closed after sampling, so that myocardial cells are prevented from falling off.

The invention relates to a flexible lockable rope-driven mechanical arm system for cardiac resection, which belongs to the technical field of minimally invasive interventional surgical instruments and comprises a flexible mechanical arm component, an end effector component, a near-end connecting seat and a locking component. The flexible mechanical arm assembly is formed by connecting a plurality of guiding discs and a plurality of locking pieces in series, the guiding discs are arranged at intervals, one locking piece is arranged every multiple guiding discs, and the guiding discs are connected with a driving rope in series through a length restraining rod. The near-end connecting base is used for being connected with a catheter sheathing canal or a mechanical arm driving base and providing an inlet for the length restraining rod and the multiple driving ropes. The end effector assembly is used for cardiac muscle resection; according to the flexible mechanical arm assembly, complex three-dimensional path planning in a narrow cardiac cavity and posture locking under a target posture can be achieved, and the positioning precision and posture stability in the myocardial resection process are improved. The end effector assembly includes a telescopic knife and a protective depth limiting structure that reduces the risk of penetrating the ventricular wall and damaging adjacent valves and conduction bundles.

The utility model relates to the technical field of medical instruments, in particular to a catheter sheath base structure convenient to operate, which comprises a main body, and a fixing component is arranged on the side surface of the main body; a larger contact area can be provided through the widened rubber positions growing on the two sides of the sheath tube seat, medical staff can easily hold the sheath tube in the operation process, looseness or displacement caused by external force in the use process is effectively prevented, stress can be better dispersed through the widened rubber positions, and the safety performance of the sheath tube is improved. Shaking caused by movement or improper operation of a patient is reduced, so that the safety and the reliability of an operation are improved, the widened rubber position can provide a larger operation space for medical staff, the operation difficulty can be reduced, the working efficiency can be improved, and especially in an emergency, the clamping ring can move in the axial direction of the sheath tube base, so that the operation is more convenient. And the elastic fixing band is used for adjusting the insertion depth of the sheathing canal body and surrounds the outer side of the sheathing canal body, and the sheathing canal body is fixed and released through tensioning and loosening.

The dilatation balloon comprises a catheter, a balloon body arranged on the catheter in a sleeving mode and a support arranged on the balloon body in a sleeving mode, and the support comprises a support body arranged outside the balloon body in a sleeving mode and a plurality of anchoring components arranged on the outer surface of the support body. The anchoring components are configured to penetrate into calcification lesion of the inner wall of a blood vessel when the stent body is in an expansion state, the capsule forms an outline with the middle portion obviously protruding relative to the two end portions in a full state, the catheter is provided with a first limiting structure, and the stent body is correspondingly provided with a second limiting structure. The first limiting structure and the second limiting structure can be matched with each other so as to allow the catheter and the stent body to generate certain relative movement in the axial direction, and local pressurization and expansion are conducted on a specific area of the stent body through the middle portion of the bag body. Therefore, not only are the fitness and anchoring effect of the stent in irregular calcification lesions improved, but also the pertinence and safety of treatment are enhanced.

The invention discloses a tracheal catheter special for upper gastrointestinal endoscopic surgery, which comprises an inner tube, an outer tube capable of sliding up and down with the inner tube is sleeved outside the inner tube, the top end of the outer tube is fixedly connected with the inner tube through a fixing knob, a respirator joint is arranged at the top end of the inner tube, an inner tube water bag is arranged at the bottom of the inner tube, and an outer tube water bag is arranged at the bottom of the inner tube. An inner tube suction hole is formed in one side of the inner tube water bag, and a Murphy hole is formed in the position, located below the inner tube water bag, of the bottom of the inner tube. The problems that in an upper gastrointestinal endoscopic surgery in the prior art, the exposed part of the tracheal catheter affects surgical operation, the cuff of the tracheal catheter compresses a surgical site or affects taking out of a specimen, the tracheal catheter rubs with an endoscope and is prone to disengagement to damage tracheal mucosa, and blood and secretions in the trachea are not sucked thoroughly are solved.

The utility model relates to the technical field of catheter sheath regulation and control, especially a sheath type regulation and control device applied to disposable catheter sheaths, which comprises an external assembly frame, a turnover closing cover plate is installed on the assembly surface of the external assembly frame, an internal assembly groove for installing the disposable catheter sheath is arranged on the assembly surface of the external assembly frame and the turnover closing cover plate, and an external adjustment frame is installed on the side wall of the external assembly frame through a flexible connecting belt. The sheath type regulation and control device applied to the disposable catheter sheath adopts a sheath type structure design, can be directly sleeved on the existing catheter sheath, and is very simple and convenient to assemble and disassemble. The external adjustment frame is installed on the side wall of the external assembly frame through the flexible connecting belt, the external adjustment frame is sleeved on the external catheter, and then the flow or temperature of the catheter is adjusted by the hand control adjustment module inside the external control port, so that the operation is very simple and convenient.

The present invention discloses a ventricular volume reduction puncture device, which includes a puncture structure and a control structure; the puncture structure includes a puncture catheter and a mapping catheter. A first limiting member is provided at the proximal end of the puncture catheter, and a puncture needle is provided at the distal end of the puncture catheter. The mapping catheter is sleeved outside the puncture catheter; the control structure includes a fixed sleeve. The proximal end of the mapping catheter is fixed in the fixed sleeve, and a guide groove adapted to the first limiting member is provided on the fixed sleeve so that the first limiting member moves axially along the guide groove, thereby driving the puncture catheter to move axially.

The utility model relates to a balloon catheter, belongs to the technical field of medical instruments, and solves the problems that an existing balloon catheter is poor in folding memorability and difficult to restore after pressure relief. A balloon catheter is composed of a tip tube, a balloon, a compression spring, an inner tube, a developing ring, an outer tube, a stress expansion tube and a catheter base. The developing ring is fixed on the inner pipe through bonding or forging and pressing; the compression spring is nested on the inner tube and the developing ring; the stress expansion pipe is a variable-diameter guide pipe and is arranged on the outer pipe in a sleeving mode. According to the balloon catheter, the compression spring is nested on the inner tube of the balloon to provide axial force for the balloon, and under the action of axial tension of the compression spring, the balloon is completely recovered from an expansion state in use to a folding state before use, so that the balloon catheter is easy to fully withdraw.

The utility model discloses a pharyngeal electrical stimulation catheter which comprises a lengthened stomach tube and a catheter sleeve, the surface of the lengthened stomach tube is sleeved with the catheter sleeve, one end of the lengthened stomach tube is provided with a stomach tube reducing sleeve, the end, away from the stomach tube reducing sleeve, of the surface of the catheter sleeve is sleeved with a balloon, and the outer wall of the balloon is provided with a plurality of sets of electrode strips at equal intervals. And a plurality of groups of micro cameras are mounted on the surface of the balloon on one side of the electrode strip at equal intervals. The pharyngeal electrical stimulation catheter is convenient to operate, control and convey to the pharynx for accurate electric shock treatment, visual observation of operation electric shock is facilitated, direct observation of the implantation depth of the pharyngeal electrical stimulation catheter is facilitated, convenience of operation and use of the pharyngeal electrical stimulation catheter is improved, and the pharyngeal electrical stimulation catheter is used as a new treatment means and is worthy of popularization and application. New hope, simple instruments and equipment and operation procedures are brought to patients with dysphagia, so that the patients can be conveniently treated at home or in daily life, and a humanized treatment scheme is provided.

The utility model discloses a dressing patch for fixing a catheter for HAIC treatment, which comprises a dressing patch main body, the back of the dressing patch main body is provided with an adhesive layer and is matched with a release layer, the dressing patch main body is provided with an inward concave area which is limited as a puncture area, and the adhesive layer is provided with an adhesive tape. A first auxiliary patch is arranged on the upper side of the inwards-concave area and used for fixing the catheter sheath in the mode of being attached to the skin. In the HAIC pipeline fixing nursing process, various fixing modes of the radial artery and the femoral artery under a common catheter or a micro catheter can be achieved; the pipeline can be arranged in a U-shaped mode, an S-shaped mode and a bending and coiling mode.

The application relates to an indwelling needle with needle tip protection, which relates to the field of indwelling needles and comprises a three-way joint, a connecting conduit, a sleeve seat, a needle handle, a hemostatic sealing plug, a puncture needle tube, a needle straightener, a sleeve and a sheath. The front end of the sleeve seat is provided with a sleeve connecting hole, and the rear side of the sleeve connecting hole is provided with an installation cavity with an open rear end in the sleeve seat. The rear part of the sleeve is inserted into the sleeve connecting hole, the connecting conduit is communicated with the installation cavity through an injection joint, the installation cavity between the hemostatic sealing plug and the needle handle is provided with a protective cap, the protective cap is sleeved on the puncture needle tube and can slide axially along the puncture needle tube, a pulling line is arranged between the rear end of the protective cap and the needle handle, the length of the pulling line is smaller than the length of the puncture needle tube on the front side of the needle handle, and the sum of the length of the pulling line and the thickness of the protective cap is not smaller than the length of the puncture needle tube on the front side of the needle handle. The indwelling needle with needle tip protection has the advantages of simple structure, low cost, same appearance as the commonly used Y-shaped indwelling needle, unchanged operation method during use, simple operation and the like.

To provide a catheter set capable of performing safe measurement.SOLUTION: A catheter set includes a catheter 15 and a measurement probe. The catheter 15 includes: an opening part 151 arranged on a tip side; a flow channel 156 arranged between the opening part and a rear end side; and a probe duct 157 arranged in parallel with the flow channel 156. The measurement probe includes a light guide body to be insertable to the probe duct 157. The catheter 15 includes a projection prevention part 159 for preventing the light guide body from projecting from a tip side of the probe duct 157.SELECTED DRAWING: Figure 24

The present invention discloses a visual combined multi-parameter monitoring lung isolation catheter, which relates to the technical field of medical devices. The lung isolation catheter includes: an outer catheter, an inner catheter and an endotracheal intubation endoscope detection system; wherein the inner catheter cuff and the outer catheter cuff are both embedded with pressure sensors; the top of the outer catheter is connected to a four-way connector, which includes an outer catheter interface, an inner catheter interface, a suction interface, and a ventilation interface; the lower end of the outer catheter is embedded with a flushing pipe, a camera, a temperature sensor, and a pH sensor; the endotracheal intubation endoscope detection system includes a data processing module for locating the glottis using a trained glottis recognition model based on an improved Yolov5s network for the collected tracheal image; and is also used to compare the temperature value, pH value, and pressure value with a preset threshold value, and to alarm when the preset threshold value is exceeded. The present invention integrates the multi-parameter monitoring function into one, which can reduce the need for multiple intubations.

To provide a gastrostomy catheter kit and connecting tube capable of further reliably maintaining a state where a gastrostomy catheter is placed in the stomach.SOLUTION: A gastrostomy catheter kit 300 comprises a gastrostomy catheter 100 and a tube 200 being detachably connected to the gastrostomy catheter 100. When a part of a connector 210 located on an axial center of a shaft 10 is pulled in the axial direction of the shaft 10, with the connector 210 of the tube 200 attached to a body surface contact part 20 of the gastrostomy catheter 100, the connector 210 is prevented from detaching from the body surface contact part 20, and when a part of the connector 210 that is offset from the axial center of the shaft 10 is pulled in a direction that combines the offset direction and the axial direction of the shaft 10, the connector 210 detaches from the body surface contact part 20.SELECTED DRAWING: Figure 7

The utility model provides a central venous catheter assembly, which comprises a puncture needle, a central venous catheter, a central venous catheter and a central venous catheter, the puncture needle is sleeved with the catheter, and the needle tip of the puncture needle is exposed out of the front end of the catheter; the blood stop valve is arranged at the rear end of the catheter, the blood stop valve is connected with a branch pipe, the branch pipe is provided with a Robert clamp, and a three-way connector is arranged at the tail end of the branch pipe; the standard Luer taper is connected to the tail end of the puncture needle, the standard Luer taper is connected with the blood stop valve, and the standard Luer taper is connected with an external injector or a plug; the needle holder is arranged on the catheter and used for clamping the catheter in the catheter pushing process; and the sensor module is arranged on the catheter and is used for monitoring the physical sign data, processing the physical sign data, comparing the processed physical sign data with a standard threshold value, and generating a warning signal when a preset threshold value is reached. According to the utility model, whether the catheter displaces or leaks liquid can be monitored in real time, so that a clinician can find complications caused by catheter displacement as soon as possible.

The utility model relates to the technical field of medical instruments, in particular to a catheter sheath adopting a variable-diameter sheathing canal, which comprises a guide wire, an expander and the variable-diameter sheathing canal, the guide wire is used for guiding the sheathing canal to penetrate into a human body, the expander penetrates into the guide wire so as to penetrate into the human body along the guide wire, the variable-diameter sheathing canal sleeves the expander, the sheathing canal is detachably connected with the expander, and the variable-diameter sheathing canal is detachably connected with the expander. The variable-diameter sheathing canal is provided with a front end used for stretching into a human body and a rear end used for being exposed out of the outer side of the human body, and the variable-diameter sheathing canal is gradually thickened from the front end to the rear end. The problems that due to the fact that sheathing canals are not matched, surgical instruments cannot penetrate into the human body smoothly, and great pain is brought to a patient are solved, the success rate of sheathing canal intervention into the body is increased, meanwhile, the pain of the patient is reduced, and the surgical instruments penetrate into the body of the patient smoothly.

The utility model discloses a guide wire separating device for coronary intervention operation, which belongs to the field of cardiovascular medicine and comprises a catheter, a fixing seat sleeved on the catheter and a separating structure used for separating a plurality of guide wires. The separating structure comprises a plurality of through holes formed in the guide pipe in an annular array mode, a conical pipe arranged at the end, away from the guide pipe, of the fixing base and a feeding groove formed in the conical pipe, correspondingly communicated with the through holes and used for guiding guide wires into the through holes. The guide wire separating device is simple in structure and convenient to operate, the guide wire can be effectively prevented from being wound in the catheter, and the safety and the success rate of an operation are improved. Through the arrangement of the through holes distributed in the annular array, a certain distance is kept between the adjacent guide wires, and direct contact and winding between the guide wires are avoided. Due to the design of the conical pipe and the feeding groove, the installation process of the guide wire is simpler, more convenient and faster, and the operation efficiency is improved.

The application relates to a balloon catheter, characterized in that the balloon catheter comprises a balloon, a catheter, a terminal tube, a developing ring, a catheter seat, a stress tube and a catheter sleeve, the catheter comprises an inner tube and an outer tube, the outer tube is sleeved outside the inner tube, the distal end of the inner tube is connected with the proximal end of the terminal tube, the distal end of the balloon is fixed on the outer surface of the terminal tube and / or the inner tube, the proximal end of the balloon is fixed on the outer surface of the distal end of the outer tube, the developing ring is arranged on the inner tube in the balloon, the stress tube is fixed on the distal end of the catheter seat, the proximal end of the inner tube is fixed inside the proximal end of the catheter seat through the stress tube and the catheter seat, the proximal end of the outer tube is fixed inside the distal end of the catheter seat through the stress tube and the catheter seat, and the catheter sleeve is sleeved outside the balloon. The balloon catheter can effectively treat arterial or venous stenosis and the like.

The utility model provides a catheter sheath silica gel pad cutting assistive device capable of accurately cutting notches on the front and back sides of a silica gel pad, the front side of a positioning plate is provided with a positioning groove used for placing the silica gel pad, the shape of the positioning groove is matched with that of the silica gel pad, and the positioning groove and the silica gel pad are in limiting fit. A second kerf is formed in the position, corresponding to the groove bottom of the positioning groove, of the back plate face of the positioning plate, and the first kerf and the second kerf are arranged in an included angle mode. During cutting, the silica gel pad is placed in the positioning groove, the position of the silica gel pad is limited due to the limiting effect of the positioning groove, then the cutter transversely penetrates through the two ends of the positioning groove along the first cutting seam, and a first notch penetrating through the radial direction is cut in the front face of the silica gel pad; and then the cutter cuts a second notch on the back surface of the silica gel pad along the second kerf from the back surface of the positioning plate, and the silica gel pad is still in a limiting state in the process, so that the accuracy of the positions of the first notch and the second notch is ensured.

The invention provides a double-cavity catheter which comprises a catheter body, the catheter body comprises a hollow outer catheter and an inner catheter arranged in the outer catheter, the outer catheter and the inner catheter are arranged in a spaced mode, the inner catheter comprises an inner bonding layer, a metal braid layer and an inner high polymer material layer from inside to outside in the radial direction, and the inner bonding layer is arranged between the metal braid layer and the inner high polymer material layer. The metal braid layer is formed by weaving metal flat filaments, the thickness range of the metal flat filaments is 0.015-0.02 mm, and the width range of the metal flat filaments is 0.1-0.15 mm. According to the double-cavity catheter, the metal woven layer of the inner tube is formed by weaving the metal flat wires with the thickness of 0.015-0.02 mm and the width of 0.1-0.15 mm, under the limiting condition that the wall thickness of the inner tube is strictly controlled to be within 0.25 mm, excellent radial supporting force and bursting resistance can still be provided, the functional requirement for high-pressure injection of a contrast agent in an interventional operation is met, and the function of high-pressure injection of the contrast agent in the interventional operation is achieved. And the whole catheter is ultrathin and small, so that the catheter can pass through a 5Fr catheter sheath.

The embodiment of the invention relates to the technical field of medical auxiliary equipment, in particular to a novel drainage tube capturing device. A novel drainage tube capturing device comprises a net basket, a first catheter, a second catheter, a sliding block and a handle, the second catheter is sleeved with the first catheter, the first catheter is connected with the handle, the sliding block is arranged on the handle in a sliding mode, the sliding block is connected with the second catheter, and the sliding block pushes the second catheter to move relative to the first catheter. The net basket is arranged at the tail end of the second guide pipe. According to the drainage tube capturing device, the tube inserting distance can be reduced, the time of the drainage tube in the mouth-nose exchange process can be shortened, the exchange process of the drainage tube can be completed in the oral cavity, meanwhile, the capturing condition of the drainage tube can be observed through an endoscope, exchange of the drainage tube can be completed more rapidly, and the operation efficiency is improved. Therefore, pain brought to a patient during intubation and extubation is reduced.