CN212415889U - Medical catheter - Google Patents

Abstract

The utility model relates to a medical catheter, which comprises a handle, a first catheter and a second catheter; the first catheter comprises an outer tube, a first inner tube and a first electrode ring, and the first electrode ring is arranged at the far end of the outer tube; the second catheter comprises a second inner tube and a second electrode ring, and the second electrode ring is arranged at the far end of the second inner tube; the handle is connected with the near end of the outer tube, and the far end of the outer tube is connected with the near end of the first electrode ring; the first inner tube is movably arranged through the handle and the outer tube and further penetrates through the far end of the outer tube; the far end of the first electrode ring is connected with the far end of the first inner tube; the second inner tube is adapted to be disposed through the handle and the first inner tube and to pass through the distal end of the first inner tube. The utility model discloses a medical catheter has the mark survey function concurrently and melts the function, and usable same medical catheter successively marks the survey and melts, need not frequently to change the pipe in the operation process, operation easy operation, and the operation time is short and be difficult for omitting to melt the target point, has improved the security and the validity of operation effectively.

Description

Medical catheter

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to medical catheter.

Background

Atrial Fibrillation (AF) is one of the most common cardiac arrhythmias in clinic, and stroke and other thromboembolic events caused by it are the main causes of death or disability of patients. The clinical studies of many countries show that the total incidence of atrial fibrillation is about 2%, and the incidence of atrial fibrillation is gradually increasing in recent years. Non-drug treatment of atrial fibrillation is a research hotspot in recent years, and many clinical studies at home and abroad prove that the application of a catheter ablation technology to successfully electrically isolate pulmonary veins can effectively prevent recurrence of atrial fibrillation and maintain sinus rhythm. Current catheter ablation is dominated by radio frequency energy, but there are other energies (including cryo, ultrasound, laser ablation, etc.). However, these thermal or cold conduction based ablations have certain limitations that lack selectivity for tissue destruction in the ablation region and, depending on the catheter's placement, may cause damage to the adjacent esophagus, coronary arteries, phrenic nerve, and the like. Unlike conventional energy, pulsed electric field energy forms irreversible micropores in the cell membrane by means of transient discharge, causing apoptosis, and achieving the purpose of non-thermal ablation, and therefore this ablation is also called irreversible electroporation ablation. Theoretically, irreversible electroporation ablation can damage target cells without heating tissues, has cell or tissue selectivity, and can effectively protect surrounding key structures, thereby reducing complications in the perioperative period and reducing the recurrence rate of diseases.

At present, when a catheter is ablated, a focus point needs to be mapped by using a mapping catheter, then the mapping catheter is withdrawn from the body of a patient, and then the focus point is ablated by using an ablation catheter, so that on one hand, the pain of the patient is increased, the operation time is prolonged, on the other hand, the ablation target point can be missed, and the safety and the effectiveness of the operation are reduced. In addition, during irreversible electroporation ablation, the ablation catheter needs to be connected with a higher voltage, and if the existing design is still adopted, voltage breakdown is easy to occur at the socket to cause short circuit.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medical catheter to solve current melting catheter and mark survey catheter and melt respectively and mark survey, lead to the operation time long, melt the problem that the target spot probably was omitted.

Another object of the present invention is to provide a medical catheter to solve the problem that the conventional ablation catheter is easy to cause short circuit due to voltage breakdown at the socket.

In order to achieve the above object, the present invention provides a medical catheter, comprising a handle, a first catheter and a second catheter;

the first catheter comprises an outer tube, a first inner tube and a first electrode ring, wherein the first electrode ring is arranged at the far end of the outer tube; the second catheter comprises a second inner tube and a second electrode ring, and the second electrode ring is arranged at the far end of the second inner tube;

the handle is connected with the near end of the outer tube, and the far end of the outer tube is connected with the near end of the first electrode ring; the first inner tube is movably arranged through the handle and the outer tube and further penetrates through the far end of the outer tube; the far end of the first electrode ring is connected with the far end of the first inner tube; the second inner tube is adapted to be disposed through the handle and the first inner tube and to pass through the distal end of the first inner tube.

Optionally, the first electrode ring is used for ablation, and the second electrode ring is used for mapping.

Optionally, a fixing portion is arranged at the far end of the first inner tube, the outer diameter of the fixing portion is larger than the outer diameter of the rest portion of the first inner tube, and the far end of the first electrode ring is fixedly connected with the fixing portion.

Optionally, the first catheter further includes a hollow push rod, a distal end of the push rod extends into the handle and is connected with the proximal end of the first inner tube, the proximal end of the push rod is disposed outside the handle, and an outer diameter of the push rod is larger than an outer diameter of the first inner tube.

Optionally, the second annular electrode ring is configured to be received within the first inner tube, the second inner tube being movably disposed through the handle and the first inner tube and selectively passing through a distal end of the first inner tube.

Optionally, the diameter of the first annular electrode ring is smaller than that of the second annular electrode ring, or the diameter of the second annular electrode ring is smaller than that of the first annular electrode ring.

Optionally, the first catheter further includes a first perfusion channel disposed in the outer tube and axially penetrating the outer tube, the first perfusion channel having a first inlet and a first outlet, the first inlet disposed at the handle, the first outlet disposed at the distal end of the outer tube, and/or the first catheter further includes a second perfusion channel disposed in the first inner tube and axially penetrating the first inner tube, the second perfusion channel having a second inlet and a second outlet, the second inlet disposed at the handle, and the second outlet disposed at the distal end of the first inner tube.

Optionally, the medical catheter further comprises a delivery tube disposed on the handle, an inlet of the delivery tube is used for receiving external saline, and an outlet of the delivery tube is connected to the first inlet.

Optionally, a plurality of pairs of electrodes are respectively arranged on the first electrode ring and the second electrode ring, each pair of electrodes comprises a positive electrode and a negative electrode, and one negative electrode is arranged between every two adjacent positive electrodes;

the medical catheter further comprises a pulse power socket and an electrode wire, wherein the pulse power socket comprises a positive socket and a negative socket, the electrode wire comprises a positive electrode wire and a negative electrode wire, the positive socket is electrically connected with a positive electrode in each electrode pair through the positive electrode wire, and the negative socket is electrically connected with a negative electrode in each electrode pair through the negative electrode wire.

Optionally, the second electrode ring includes an annular section, an annular shaped wire and a control ring pull wire are arranged in the annular section, one end of the annular shaped wire is fixed to the second inner tube, the other end of the annular shaped wire is fixedly connected with one end of the control ring pull wire, and the other end of the control ring pull wire extends through the second inner tube; the annular shaping wire is matched with the loop control stay wire to control the loop shape of the second electrode loop; wherein the distal end of the annular sizing wire has a taper and/or the distal end of the annular sizing wire is configured in an inwardly curled barb shape.

Optionally, the medical catheter further includes a ring electrode disposed at the distal end of the outer tube, and the handle is provided with an electrical positioning socket electrically connected to the ring electrode.

Optionally, the outer tube includes a non-adjustable bending section and an adjustable bending section, and the first electrode ring is connected to a distal end of the adjustable bending section;

the medical catheter further comprises a traction wire, one end of the traction wire is connected with the adjustable bending section, and the other end of the traction wire is connected with a bidirectional bending control knob arranged on the handle.

The utility model discloses a medical catheter has the mark survey function concurrently and melts the function, melts and mark survey and almost can go on simultaneously, can effectively avoid melting the omission of target point, improves the security and the validity of operation, need not to change the pipe at the operation in-process moreover, has alleviateed the injury to the patient, is favorable to patient postoperative rehabilitation, has also shortened the operation time simultaneously, makes the operation simpler and convenient.

Furthermore, the utility model discloses a medical catheter accessible electric pulse melts, at this moment, pulse power socket is preferred positive socket and the negative pole socket that separately sets up, makes positive socket pass through the positive electrode line and is connected with the positive electrode electricity of electrode centering to make the negative pole socket pass through the negative electrode line and be connected with the negative electrode electricity, so the structure, when applying higher voltage in positive socket and negative pole socket, the space between these sockets is difficult to puncture to the voltage and cause the short circuit, consequently can insert higher energy pulse electric field, be applicable to irreversible electroporation and melt, improve the security of operation.

In addition, the distal end of annular design silk has the tapering, helps reducing the hardness of distal end, makes it softer, and the distal end is inwards curled simultaneously and is formed the barb, and the risk that the distal end of second electrode circle inserted the vascular wall can all be avoided to these designs, further improves the security.

Drawings

FIG. 1 is a schematic structural view of a medical catheter according to a preferred embodiment of the present invention, wherein the length of the outer tube has been omitted by way of interruption;

FIG. 2 is a schematic view of the distal end of a medical catheter according to a preferred embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second electrode ring according to a preferred embodiment of the present invention.

Detailed Description

In order to make the contents of the present invention more clearly understood, the present invention will be further described with reference to the drawings and the following embodiments. It is to be understood that the invention is not limited to the particular embodiments described below, and that general alternatives known to those skilled in the art are intended to be included within the scope of the invention. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

It should be understood that in the following description, references to "upper" and "lower" components may be made based on the accompanying drawings. Spatial terms such as "below …", "below …", "below", "above", and the like are intended to facilitate describing the positional relationship of one element to another element as illustrated in the figures, and may encompass a variety of different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented, such as rotated 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.

It should also be understood that in the following description, "proximal" and "distal" are relative positions, relative positions and orientations of elements or actions with respect to each other from the perspective of a physician using the medical catheter, and that although "proximal" and "distal" are not intended to be limiting, "proximal" generally refers to the end of the medical catheter that is closer to the physician during normal operation, and correspondingly, "distal" generally refers to the end of the medical catheter that is first introduced into the body during normal operation. In addition, "connected" includes direct connection between systems, components and parts, and also includes connection between systems, components and parts through a medium, that is, indirect connection.

Referring to fig. 1 and 2, the present embodiment provides a medical catheter 100 including a handle 11, a first catheter 12, and a second catheter 13; the first catheter comprises an outer tube 121, a first inner tube 122 and a first electrode ring 123; the second catheter 13 includes a second inner tube 131 and a second electrode ring 132, and the second electrode ring 132 is disposed at a distal end of the second inner tube 131. The handle 11 is connected with the proximal end of the outer tube 121, and the distal end of the outer tube 121 is connected with the proximal end of the first electrode ring 123; from the proximal end of the handle 11, the first inner tube 122 is movably disposed through the handle 11 and the outer tube 121 and further passes through the distal end of the outer tube 121; the first electrode ring 123 is disposed at the distal end of the outer tube 121, and the distal end of the first electrode ring 123 is connected to the distal end of the first inner tube 122. From the proximal end of the handle 11, the second inner tube 131 is adapted to be inserted through the handle 11 and the first inner tube 122 and through the distal end of the first inner tube 122, and preferably, the second inner tube 131 is movably inserted through the handle 11 and the first inner tube 122 and selectively through the distal end of the first inner tube 122, such that the second electrode ring 132 is located at the distal end of the first inner tube 122 when the second catheter 13 is in operation. Here, it should be understood that the selective passing of the second inner tube 131 through the distal end of the first inner tube 122 includes: the second inner tube 131 does not need to pass through the distal end of the first inner tube 122 and can be received in the first inner tube 122 when the second catheter 13 is not in operation, and the second inner tube 131 needs to pass through the distal end of the first inner tube 122 when the second catheter 13 is in operation. In other embodiments, when the second conduit 13 is not needed, the second conduit 13 can be removed entirely from the handle 11, which is not limited by the present invention.

One of the first electrode ring 123 and the second electrode ring 132 may be an electrode ring for ablation, which is used for ablating a focal point; the other of the first electrode ring 123 and the second electrode ring 132 may be a mapping electrode ring for mapping a lesion point. Preferably, the first electrode ring 123 is an electrode ring for ablation, and the second electrode ring 132 is an electrode ring for mapping, which is more suitable for the operation habit of the doctor. In the following description, the structure and the usage of the medical catheter 100 provided in the present invention will be further described with the first electrode ring 123 as an electrode ring for ablation and the second electrode ring 132 as an electrode ring for mapping as an illustration, but this illustration does not limit the present invention, and it should be understood that the following embodiments are also applicable to the case where the first electrode ring 123 is an electrode ring for mapping and the first electrode ring 132 is an electrode ring for ablation.

In practical application, after the internal part (i.e. the part which needs to enter the human body) of the medical catheter 100 is delivered into the body of a patient, when ablation is needed, the second catheter 13 is firstly utilized to map the focus point, the second catheter 13 can move back and forth (i.e. the second catheter 13 moves relative to the first inner tube 122) and can also rotate the second catheter 13 (i.e. the second catheter 13 can rotate relative to the first inner tube 122) in the mapping process, so as to adjust the position of the second electrode ring 132, thereby accurately extracting the potential, after mapping is completed, the focus point is ablated by utilizing the first catheter 12, the ablation mode can be radio frequency ablation, electric pulse ablation, cryoablation or laser ablation, and the like, preferably, the electric pulse ablation is carried out, the outer tube 121 is kept still in the ablation process, the loop diameter of the first electrode ring 123 can be adjusted by moving the first inner tube 122, so that the first electrode ring 123 is better attached to the loop structure of the, ensuring the ablation effect. The annulus of the focal site may be the ostium of a pulmonary vein, coronary sinus, or other annulus.

Therefore, the utility model discloses a medical catheter 100 has the mark survey function concurrently and melts the function, melts and can go on simultaneously with the mark survey almost, can effectively avoid melting the omission of target point, improves the security and the validity of operation, need not to change the pipe at the operation in-process moreover, has alleviateed the injury to the patient, is favorable to patient's postoperative rehabilitation, has also shortened the operation time simultaneously, makes the operation simpler and convenient.

Further, a fixing portion 124 is disposed at a distal end of the first inner tube 122, an outer diameter of the fixing portion 124 is larger than an outer diameter of the rest of the first inner tube 122, and the distal end of the first electrode ring 123 is fixedly connected to the fixing portion 124, and the fixing connection may be glue bonding or hot melt connection. Since the outer diameter of the fixing portion 124 is large, the contact area is correspondingly increased, so that the first electrode ring 123 can be effectively fixed, and the connection stability of the first electrode ring 123 is ensured. Further, since the outer diameter of the fixing portion 124 is larger and the inner space thereof is also larger, the fixing portion 124 may be integrally formed with the rest of the first inner tube 122, or may be formed separately from the rest of the first inner tube 122, and the first inner tube 122 is disposed in the fixing portion 124. In addition, the proximal end of the first electrode ring 123 is fixedly connected with the inner wall of the distal end of the outer tube 121, and the fixed connection mode can be glue bonding or hot melting connection.

Further, the first catheter 12 may further include a hollow push rod 125, a distal end of the push rod 125 extends into the handle 11 and is connected, optionally detachably, for example, by being snapped on, to the proximal end of the first inner tube 122, and a proximal end of the push rod 125 is disposed outside the handle 11 for an operator to operate. Meanwhile, the second guide tube 13 movably penetrates the push rod 125 and the first inner tube 122, and the outer diameter of the push rod 125 is larger than that of the first inner tube 122, so that an operator pushes the first inner tube 122 to move by means of the push rod 125. Here, considering that the first inner tube 122 has a small outer diameter and is not convenient to grip, the grip area is enlarged by designing the push rod 125, thereby making the surgical operation more convenient.

The utility model discloses it is not injectd to the circle footpath of first electrode circle 123 and the circle footpath of second electrode circle 132. Since the diameters of the first electrode ring 123 and the second electrode ring 132 are relatively small, and the difference between the outer diameter of the ring and the inner diameter of the ring is negligible, the diameters are uniformly indicated for convenience of description and without distinction. For example, in some embodiments, the first electrode ring 123 can have a ring diameter of 18mm to 40mm, such as 25mm, 30mm, or 35 mm. The diameter of the second electrode ring 132 may be 12mm to 25mm, for example 15mm, 18mm or 22 mm. Further, the diameter of the first electrode ring 123 may be larger than, smaller than or equal to that of the second electrode ring 132. Preferably, the second electrode ring 132 can be received within the first inner tube 122 to avoid interference during ablation.

The utility model discloses do not restrict yet to the coil number of turns of two electrode circles, generally, the coil number of turns of every electrode circle can be 1 circle-3 circles. And the number of the electrodes on the two electrode rings is not limited, generally, each electrode ring is provided with a plurality of electrodes, preferably an even number of electrodes, such as 8 to 20 electrodes. In one embodiment, if electrical pulse ablation is used, multiple pairs of electrodes may be disposed on each electrode loop, each pair of electrodes including a positive electrode and a negative electrode, one negative electrode disposed between each two adjacent positive electrodes, and multiple pairs of electrodes spaced apart along the length of the electrode loop to provide sufficient energy for ablation and mapping, respectively. Optionally, 4 to 10 pairs of electrodes can be arranged on each electrode ring. In addition, a negative electrode is disposed between adjacent positive electrodes. In addition, the shape of the ring shape constituting the two electrode rings is not limited, and may be a regular shape such as a circle, an ellipse, or an irregular shape.

Further to avoid thrombus formation during ablation, the first catheter 12 further includes a first infusion channel (not shown) disposed in the outer tube 121 and extending axially through the outer tube 121. As shown in fig. 1, the first perfusion channel has a first inlet provided at the handle 11 and a first outlet 126 provided at the distal end of the outer tube 121. External saline enters the first perfusion channel through the first inlet and finally flows out of the outer tube 121 through the first outlet 126, so that saline scouring is formed at the proximal end of the first electrode ring 123, and thrombosis during ablation is effectively avoided. In this embodiment, the outer tube 121 may be a multi-lumen tube, wherein one lumen may be configured as the first perfusion channel, another lumen is used for passing through the first inner tube 122, and preferably, other lumens are also present for passing through a guide wire and the like.

Further, the first catheter 12 further includes a second perfusion channel (not shown) disposed in the first inner tube 122 and axially extending through the first inner tube 122. As shown in fig. 1, the second perfusion channel has a second inlet provided at the handle 11 and a second outlet 127 provided at the distal end of the first inner tube 122. Similarly, the external saline enters the second perfusion channel through the second inlet and finally flows out of the first inner tube 122 through the second outlet 127, so that saline flushing is formed at the proximal end of the second electrode ring 132, and the risk of generating thrombus during ablation and marking is effectively reduced. In this embodiment, the first inner tube 122 may also be a multi-lumen tube, which may provide the second perfusion channel, through which the second catheter 13 may be passed, and in which a guide wire may be arranged in different lumens. The first perfusion channel and the second perfusion channel can be arranged alternatively or simultaneously. The medical catheter 100 may also preferably include a delivery tube 14 disposed on the handle 11. The delivery tube 14 has an inlet and an outlet, the inlet of the delivery tube 14 is used for accessing external saline, and the outlet of the delivery tube 14 is connected with the first inlet, so that the saline can be delivered to the first perfusion channel through the delivery tube 14. In addition, a luer connector may be disposed at the proximal end of the push rod 125 for receiving external saline, and the luer connector is used to connect with the second inlet to deliver the saline to the second inlet.

The medical catheter 100 may also preferably include a ring electrode 15 disposed at the distal end of the outer tube 121. The number of the ring electrodes 15 can be one or more, preferably 2 to 6, and the electric positioning can be realized by one or more ring electrodes 15, so as to better display the position. Specifically, the ring electrode 15 can display a position in an externally applied electric field, thereby precisely positioning the position of the first electrode ring 123. The medical catheter 100 also includes a power supply assembly including an electrical positioning hub 16 disposed on the handle 11 and electrically connected to the ring electrode 15 via an electrode lead.

Furthermore, the power supply assembly further comprises a pulse power supply socket and an electrode wire, wherein the electrode wire comprises a positive electrode wire and a negative electrode wire, and the pulse power supply socket is used for being connected with an external pulse power supply. The pulse power socket is electrically connected with the positive electrode of each electrode pair through a positive electrode wire and is electrically connected with the negative electrode of each electrode pair through a negative electrode wire, and is used for sending high-voltage pulses to each electrode pair. Further to improve electrical safety, the pulse power socket comprises a positive socket 17 and a negative socket 18. The positive electrodes on the first electrode ring 123 and the second electrode ring 132 are electrically connected with the positive socket 17 through a positive electrode wire, and the negative electrodes on the first electrode ring 123 and the second electrode ring 132 are electrically connected with the negative socket 18 through a negative electrode wire. With this configuration, can separate anodal circuit and negative pole circuit, avoid the short circuit risk, guarantee electric security. In prior art, the socket of being connected with positive negative electrode is the integrative socket of same high-low pressure, and the utility model discloses be independent high-pressure socket (being anodal socket) and low-voltage socket (negative pole socket) with the integrative socket split of high-low pressure, the voltage is difficult to puncture the space between these sockets and causes the short circuit, consequently can insert the pulse electric field of higher energy, is applicable to irreversible electroporation and melts, improves the security of operation. Here, it is understood that the positive socket 17 is used to apply a positive current to the positive electrode, and the negative socket 18 is used to apply a negative current to the negative electrode.

Further, the outer tube 121 generally includes a non-adjustable bend section and an adjustable bend section. The first electrode ring 123 is connected to the distal end of the adjustable bending section, the material hardness of the adjustable bending section is different from that of the non-adjustable bending section, and the material hardness of the adjustable bending section is lower than that of the non-adjustable bending section, so that the adjustable bending section can be bent easily under traction, and the non-adjustable bending section (or called a straight section) cannot be bent. Further, a bidirectional bending control knob 19 is arranged on the handle 11, the medical catheter 100 further comprises a traction wire, one end of the traction wire is connected with the adjustable bending section, and the other end of the traction wire is connected with the bidirectional bending control knob 19. When the medical catheter 100 is inserted into the target cavity, the bending of the adjustable bending section can be controlled by the bidirectional bending control knob 19, so that the medical catheter 100 can be inserted to conform to the bending shape of the target cavity.

Fig. 3 is a schematic structural diagram of a second electrode ring according to a preferred embodiment of the present invention. The second electrode ring 132 has a ring structure, which may be a closed ring or an open ring. Specifically, second electrode circle 132 includes the ring segment, be provided with annular stock wire 1321 and accuse circle act as go-between (not shown) in the ring segment, the one end of annular stock wire 1321 is fixed in second inner tube 131, the other end of annular stock wire 1321 with the one end fixed connection that the line was acted as go-between is acted as go-between to the accuse circle, the other end that the line was acted as go-between is extended through second inner tube 131 to the accuse circle. The annular sizing wire 1321 has a center of symmetry; be provided with two sets of windows 1322 on the annular is stereotyped silk 1321, two sets of windows 1322 are about the symmetry center is roughly symmetrical distribution, and every group the window 1322 includes at least one subwindow 1323, subwindow 1323 set up in annular is stereotyped silk 1321 faces on the side of symmetry center, perhaps subwindow 1323 set up in annular is stereotyped silk 1321 deviates from on the side of symmetry center.

Two groups of windows 1322 are arranged on the annular shaping wire 1321 in the annular section, the strength of different positions of the annular shaping wire 1321 is changed, the strength of the part, provided with the window 1322, of the annular shaping wire 1321 is reduced relative to the strength of the part, not provided with the window 1322, under the traction of a coil control pull wire, the annular shaping wire 1321 deforms, the annular shaping wire 1321 is in an open oval shape at the moment, the annular shaping wire 1321 is arranged in the annular section, the appearance shape of the annular section is consistent with the appearance shape of the annular shaping wire 1321, and therefore one end of the annular section is also in the open oval shape. Therefore, the diameter of the ring can be adjusted according to the pulmonary vein orifice, so that the electrode ring for mapping can be better attached to the focus.

In this embodiment, a segment of the ring segment is open circular or elliptical, i.e., the ring segment is non-closed circular, although in other embodiments, the end of the ring shaped sizing wire may contact the beginning of the ring shaped sizing wire 1321 such that the end of the ring segment may contact the beginning of the ring segment to form a circle or ellipse without an opening, i.e., the ring segment is closed circular. The utility model discloses do not limit to this. Alternatively, the annular sizing wire 1321 may be designed with different tapers to change the strength distribution of the annular sizing wire 1321 to facilitate the transition from a circular shape to an elliptical shape under the action of the loop control pull wire, so as to better fit the pulmonary vein. Further, the distal end of annular stock silk 1321 has the tapering to reduce the hardness of the distal end of annular stock silk 1321, make its distal end softer, reduce the risk that the distal end inserted the vascular wall, it is preferred, the distal end of annular stock silk 1321 is constructed into inside curled barb, makes the distal end of annular stock silk 1321 not towards the vascular wall, can more effectively avoid the distal end of second electrode circle 132 to insert the vascular wall, and these modes all can further improve the security of operation.

The operation of the medical catheter 100 of the present invention will be further described with reference to the preferred embodiments.

Firstly, corresponding external power line plugs are respectively inserted into the positive socket 17, the negative socket 18 and the electric positioning socket 16; then, the handle 11 is held, the bidirectional bending control knob 19 is rotated according to the bending shape of the target cavity, the adjustable bending section is pulled by the traction wire to be bent, the medical catheter 100 enters the target cavity, and the position of the far end of the medical catheter 100 is determined according to the ring electrode 15; after the distal end of the medical catheter 100 reaches the target position, the delivery tube 14 and the push rod 125 are connected to external saline, and the external saline flows out from the first outlet 126 and the second outlet 127; then, the first inner tube 122 and the second inner tube 131 are pushed towards the far end direction, so that the second electrode ring 132 reaches a focus point, and an ablation target point is marked; after the ablation target point is marked, pulling the second inner tube 131 in the proximal direction to retract the second electrode ring 132 into the first inner tube 122; then, the handle 11 is held, and the first inner tube 122 is pushed to deliver the first electrode ring 123 to the ablation target point for ablation; after ablation, the external saline infusion is stopped and the medical catheter 100 is withdrawn.

The utility model discloses well technical scheme both applicable ablation and the mark survey operation in the electrophysiology field, also applicable ablation and the mark survey operation in other fields, for example as the medical catheter of oncotherapy, the utility model discloses do not restrict to this.

The above description is only for the description of some embodiments of the present invention, and not for any limitation of the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure all belong to the protection scope of the present invention.

Claims (11)

1. A medical catheter comprising a handle, a first catheter and a second catheter;

the first catheter comprises an outer tube, a first inner tube and a first electrode ring, wherein the first electrode ring is arranged at the far end of the outer tube; the second catheter comprises a second inner tube and a second electrode ring, and the second electrode ring is arranged at the far end of the second inner tube;

the handle is connected with the near end of the outer tube, and the far end of the outer tube is connected with the near end of the first electrode ring; the first inner tube is movably arranged through the handle and the outer tube and further penetrates through the far end of the outer tube; the far end of the first electrode ring is connected with the far end of the first inner tube; the second inner tube is adapted to be disposed through the handle and the first inner tube and to pass through the distal end of the first inner tube.

2. The medical catheter of claim 1, wherein the first electrode loop is used for ablation and the second electrode loop is used for mapping.

3. A medical catheter according to claim 1 or 2, wherein the distal end of the first inner tube is provided with a fixing portion having an outer diameter larger than the outer diameter of the rest of the first inner tube, and the distal end of the first electrode ring is fixedly connected with the fixing portion.

4. The medical catheter of claim 1 or 2, wherein the first catheter further comprises a hollow push rod, a distal end of the push rod extends into the handle to connect with the proximal end of the first inner tube, and a proximal end of the push rod is disposed outside the handle, and an outer diameter of the push rod is larger than an outer diameter of the first inner tube.

5. The medical catheter of claim 1 or 2, wherein the second electrode ring is configured to be received within the first inner tube, the second inner tube being movably disposed through the handle and the first inner tube and selectively passing through the distal end of the first inner tube.

6. A medical catheter according to claim 1 or 2, wherein the first catheter further comprises a first perfusion channel provided in and axially through the outer tube, the first perfusion channel having a first inlet provided at the handle and a first outlet provided at the distal end of the outer tube, and/or the first catheter further comprises a second perfusion channel provided in and axially through the first inner tube, the second perfusion channel having a second inlet provided at the handle and a second outlet provided at the distal end of the first inner tube.

7. The medical catheter of claim 6, further comprising a delivery tube disposed on the handle, an inlet of the delivery tube for receiving external saline, and an outlet of the delivery tube connected to the first inlet.

8. A medical catheter as in claim 1 or 2, wherein a plurality of pairs of electrodes are disposed on the first and second electrode rings, respectively, each pair of electrodes comprising a positive electrode and a negative electrode, one negative electrode disposed between each two adjacent positive electrodes;

the medical catheter further comprises a pulse power socket and an electrode wire, wherein the pulse power socket comprises a positive socket and a negative socket, the electrode wire comprises a positive electrode wire and a negative electrode wire, the positive socket is electrically connected with a positive electrode in each electrode pair through the positive electrode wire, and the negative socket is electrically connected with a negative electrode in each electrode pair through the negative electrode wire.

9. The medical catheter of claim 1 or 2, wherein the second electrode loop comprises an annular section having an annular sizing wire and a control loop pull wire disposed therein, the annular sizing wire having one end secured to the second inner tube and the other end fixedly attached to one end of the control loop pull wire, the other end of the control loop pull wire extending through the second inner tube; the annular shaping wire is matched with the loop control stay wire to control the loop shape of the second electrode loop; wherein the distal end of the annular sizing wire has a taper and/or the distal end of the annular sizing wire is configured in an inwardly curled barb shape.

10. A medical catheter according to claim 1 or 2, further comprising a ring electrode disposed at the distal end of the outer tube, and wherein the handle is provided with an electrical locating socket thereon in electrical connection with the ring electrode.

11. The medical catheter of claim 1 or 2, wherein the outer tube includes a non-adjustable bend section and an adjustable bend section, the first electrode ring being connected to a distal end of the adjustable bend section;

the medical catheter further comprises a traction wire, one end of the traction wire is connected with the adjustable bending section, and the other end of the traction wire is connected with a bidirectional bending control knob arranged on the handle.

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