A hollow mapping electrode assembly

Abstract

The present application belongs to the field of medical devices, and particularly relates to a hollow mapping electrode assembly, which comprises a guide wire, a mapping catheter and a locking device; the guide wire is hollow, and a guide wire wire is arranged in the hollow of the guide wire; a guide wire distal end electrode ring is arranged on the distal end side wall of the guide wire, and a guide wire proximal end electrode ring is arranged on the proximal end side wall of the guide wire; a mapping distal end electrode ring is arranged on the distal end side wall of the mapping catheter, and a mapping proximal end electrode ring is arranged on the proximal end side wall of the mapping catheter; the locking device comprises a tube body, a soft ring and a cap. The guide wire and the mapping catheter are used in cooperation, the number of electrodes can be expanded according to the situation, and larger range of mapping data can be collected; the distance between the guide wire distal end electrode ring and the mapping distal end electrode ring can be adjusted according to the situation; the locking device can lock the guide wire and the mapping catheter, prevent relative sliding of the guide wire and the mapping catheter, improve the stable shape of the electrode ring and the heart cavity tissue, and reduce the risk of falling off and displacement.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a hollow calibration electrode assembly. Background Technology

[0002] Traditional cardiac electrophysiological processing methods obtain information about internal structures through X-ray imaging or contrast imaging. These methods increase the patient's exposure time to X-rays and the dosage of contrast agents, potentially causing harm. Furthermore, the resulting two-dimensional images increase the difficulty for physicians to interpret, making the procedure inconvenient. Therefore, coronary sinus mapping catheters, due to their safety, accuracy, and efficiency, are widely used for mapping various complex arrhythmias and for catheter radiofrequency ablation.

[0003] However, due to the significant anatomical variations in the coronary sinus system (CVS), the complexity of adjacent structures, its tortuous course, and numerous branches, most commercially available coronary sinus mapping catheters are planar curved, making it difficult to enter the coronary sinus ostium. The acquired electrophysiological signals are also relatively rigid and inflexible, with no flexible adjustment between acquisition intervals. Furthermore, the catheter electrodes are unstable in their contact with the cardiac tissue, making them prone to detachment and displacement. This results in unstable acquired electrophysiological signals, thereby increasing the difficulty of cardiac surgery and prolonging the operation time. Summary of the Invention

[0004] The hollow calibration electrode assembly provided by this invention can effectively solve the problems in the background art.

[0005] The present invention provides a hollow mapping electrode assembly, comprising a guide wire, a mapping catheter, and a locking device;

[0006] The guidewire is hollow, and a guidewire wire is installed inside the hollow guidewire; a guidewire distal electrode ring is provided on the distal sidewall of the guidewire, and a guidewire proximal electrode ring is provided on the proximal sidewall of the guidewire. The guidewire distal electrode ring and the guidewire proximal electrode ring are connected by the guidewire wire.

[0007] The mapping catheter includes a hollow inner layer and an outer layer sleeved over the inner layer, with a mapping lead wire between the inner and outer layers; the distal sidewall of the mapping catheter is provided with a distal mapping electrode ring, and the proximal sidewall of the mapping catheter is provided with a proximal mapping electrode ring, which are connected by the mapping lead wire; the inner layer of the mapping catheter is sleeved on the guidewire.

[0008] The locking device includes a tube body, a flexible ring, and a cap. One end of the tube body has an external thread, and the inner wall of this end has a limiting part. The other end of the tube body has a Luer connector. The flexible ring is fitted inside one end of the tube body and abuts against the limiting part. The cap is fitted on one end of the tube body and has an internal thread corresponding to the external thread. The bottom of the cap has a compression part that extends into one end of the tube body and abuts against the flexible ring. The compression part is sleeve-shaped, and the bottom of the cap has a hole that communicates with the compression part. The tube body is fitted on the proximal end of the guidewire. The proximal electrode ring of the guidewire passes through the flexible ring and the hole. The Luer connector can fix the proximal end of the mapping catheter.

[0009] As a further optimization of the present invention, the locking device further includes a washer; the washer is disposed between the soft ring and the compression part; one end face of the washer is provided with an annular protrusion, and the other end face of the washer is provided with an annular groove; the soft ring is provided with a soft ring groove corresponding to the annular protrusion; the compression part is provided with a compression protrusion corresponding to the annular groove.

[0010] As a further optimization of the present invention, the side wall of the tube body is provided with a third port communicating with the tube body.

[0011] As a further optimization of the present invention, the guidewire is a dual-stage guidewire, with two distal electrode rings and two proximal electrode rings, which correspond to each other.

[0012] As a further optimization of the present invention, the hollow guide wire is further provided with a first winding wire and a second winding wire, both of which are spiral in shape; the first winding wire is located between the two distal electrode rings of the guide wire, one end of the second winding wire is connected to the first winding wire, and the other end of the second winding wire is located at the distal end of the guide wire; the first winding wire is malleable; the second winding wire and the first winding wire are made of the same material or different materials.

[0013] As a further optimization of the present invention, one or more distal electrode rings and one proximal electrode ring are provided and correspond to each other.

[0014] As a further optimization of the present invention, both ends of the distal electrode ring and the proximal electrode ring of the guidewire are provided with bamboo-shaped adhesive.

[0015] As a further optimization of the present invention, it also includes a cable plug; one end of the cable plug is detachably connected to the distal electrode ring of the guide wire, the proximal electrode ring of the guide wire, the distal electrode ring of the calibration, or the proximal electrode ring of the calibration, and the other end of the cable plug is inserted into an external device.

[0016] As a further optimization of the present invention, the mapping catheter is also provided with a bending adjustment component, which includes a bending adjustment handle and a pull wire;

[0017] The bending handle includes a gear, a handle, and two parallel racks with opposing teeth; the gear is located between the two racks and meshes with them; a clamping gap is provided between the shaft of the gear and the root of the racks; the racks and the gear are located on the handle.

[0018] There are two pull wires, which are located between the inner and outer layers and distributed on both sides of the inner layer. One end of the pull wire is fixed to the distal end of the mapping guide tube, and the other end of the pull wire passes through the clamping gap and through the handle.

[0019] As a further optimization of the present invention, a plug is also included, the plug comprising a housing, a compression spring, a pressure block, a hose, a conductor, and a conductor wire;

[0020] The housing has a cavity and a pressing part; a compression spring is located inside the cavity; a pressure block is pressed on the compression spring and also corresponds to the pressing part; a flexible tube passes through the pressure block; a conductor passes through the flexible tube from the side of the pressure block; a conductor wire extends from one end of the housing into the cavity and connects to the conductor; the proximal end of the guide wire or the mapping guide tube is inserted into the flexible tube from the other end of the housing, and the proximal electrode ring of the guide wire or the proximal electrode ring of the mapping guide tube contacts the conductor;

[0021] The hose bends from a straight state under the action of the compression spring; pressing the pressure block will restore the hose to a straight state.

[0022] This invention provides a hollow mapping electrode assembly, which uses a guidewire and mapping catheter together. The number of electrodes can be expanded as needed to collect mapping data over a wider area. The spacing between the distal electrode rings of the guidewire and the distal electrode rings of the mapping catheter can also be adjusted as needed. The locking device used locks the guidewire and mapping catheter, preventing relative slippage and improving the stability of the electrode rings against the cardiac tissue, reducing the risk of dislodgement or displacement. This invention also features a flexible adjustment function for the distal bending profile.

[0023] Instruction manual illustrations

[0024] Figure 1 This is a schematic diagram of the internal structure of the guidewire in this embodiment;

[0025] Figure 2 This is a schematic diagram of the mapping catheter structure in this embodiment;

[0026] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0027] Figure 4 This is a cross-sectional structural diagram of the locking device in this embodiment;

[0028] Figure 5 yes Figure 4 Assembly section diagram of the soft ring and washer;

[0029] Figure 6 This is a schematic diagram of the assembly structure of the plug, including the pressure block, hose, and conductor.

[0030] Figure 7 This is a schematic diagram of the bending handle structure in this embodiment;

[0031] Among them, there are: guide wire 1, guide wire distal electrode ring 1a, guide wire proximal electrode ring 1b, guide wire conductor 1c, first winding wire 1d, second winding wire 1e, core wire 1f, mapping conduit 2, mapping distal electrode ring 2a, mapping proximal electrode ring 2b, outer layer 2c, inner layer 2d, bamboo-shaped glue 2e, locking device 3, tube body 3a, limiting part 3a1, third port 3a2, soft ring 3b, cap 3c, squeezing part 3c1, washer 3d, annular protrusion 3d1, annular groove 3d2, pressure block 4a, hose 4b, conductor 4c, conductor wire 4d, bending handle 6, gear 6a, rack 6b, handle 6c, and pull wire 7. Detailed Implementation

[0032] This embodiment includes a guidewire 1, a mapping catheter 2, and a locking device 3.

[0033] like Figure 1 As shown, the distal end of the guidewire 1 is provided with a guidewire distal electrode ring 1a sleeved on the side wall. In this embodiment, there are two guidewire distal electrode rings 1a, but in other embodiments, one or more may be provided. In this embodiment, two guidewire proximal electrode rings 1b are provided at the proximal end of the guidewire 1, which are opposite to the guidewire distal electrode rings 1a.

[0034] The guide wire 1 is hollow, and two guide wires 1c are installed inside the hollow guide wire 1. The two ends of one guide wire 1c are connected to a distal electrode ring 1a and a proximal electrode ring 1b of the guide wire, respectively. The two ends of the other guide wire 1 are connected to another distal electrode ring 1a and another proximal electrode ring 1b of the guide wire, so that the distal electrode ring 1a and the proximal electrode ring 1b of the guide wire form two sets of conductive structures. In addition to the guide wires 1c inside, the hollow guide wire 1 can also have a core wire 1f inserted. The core wire 1f is made of nickel-titanium alloy material with good plastic deformation recovery properties.

[0035] like Figure 2 , Figure 3 As shown, the distal sidewall of the mapping catheter 2 is provided with a distal mapping electrode ring 2a, and the proximal sidewall of the mapping catheter 2 is provided with a proximal mapping electrode ring 2b. In this embodiment, there are four distal mapping electrode rings 2a and four corresponding proximal mapping electrode rings 2b. In other embodiments, the distal mapping electrode rings 2a and proximal mapping electrode rings 2b may also be one, two, three, or more than four.

[0036] In this embodiment, the mapping conduit 2 includes a hollow inner layer 2d and an outer layer 2c sleeved outside the inner layer 2d. Mapping wires for connecting four distal mapping electrode rings 2a and four proximal mapping electrode rings 2b are positioned between the inner layer 2d and the outer layer 2c, with the gap between the inner layer 2d and the outer layer 2c just large enough to accommodate the four mapping wires, ensuring that the four mapping wires are arranged in an orderly manner without interlacing.

[0037] The inner layer 2d of the mapping catheter 2 is fitted onto the guidewire 1. The guidewire 1 can slide back and forth within the mapping catheter 2, and the distal electrode ring 1a of the guidewire is fully exposed from the distal end of the mapping catheter 2. During the procedure, the amount of ECG signal acquired can be increased or decreased by changing the number of guidewires 1 with different numbers of distal electrode rings 1a. The distance between the distal electrode rings 1a and 2a of the guidewire can also be changed by adjusting the relative positions of the guidewire 1 and the mapping catheter 2.

[0038] Furthermore, such as Figure 7 As shown, in this embodiment, the bending handle 6 is also provided with a bending assembly, which includes the bending handle 6 and the pull cable 7.

[0039] The bending handle 6 is located at the proximal end of the measuring guide tube 2. The bending handle 6 includes a gear 6a, a handle 6c, and two parallel racks 6b with opposing teeth. The gear 6a is located between the two racks 6b and meshes with both racks 6b simultaneously. The handle 6c is used for hand gripping and operation, and both racks 6b and gear 6a are mounted on the handle 6c.

[0040] A clamping gap is also provided between the shaft of gear 6a and the root of rack 6b.

[0041] Two pull wires 7 are located between the inner and outer layers of the measuring guide tube 2 and distributed on both sides of the inner layer. One end of the pull wire 7 is fixed to the distal end of the measuring guide tube 2. The pull wire 7 is a rectangular stainless steel flat wire. The other ends of the two pull wires 7 pass through the clamping gap from both sides and then through the handle 6c. The gear 6a and the rack 6b clamp the two pull wires 7 through the clamping gap.

[0042] During operation, the two pull wires 7 are pulled back and forth in a staggered manner. Under the action of friction, the gear 6a is driven to rotate through the clamping gap. The rotation of gear 6a drives the two racks 6b to move back and forth in a staggered manner, thereby realizing the function of adjusting the bending of the electrode conduit.

[0043] The bending handle 6 with this structure can, on the one hand, fix the two pull wires 7, and on the other hand, reduce the friction between the pull wires 7 and the clamping gap when they are pulled.

[0044] In addition, in this embodiment, the distal end of the guidewire 1 is usually provided with a fixed curved section. The use of a fixed curved section and an adjustable curved section together can be well applied to structures with complex adjacent structures, tortuous course, and many branches in the coronary sinus system.

[0045] Furthermore, in this embodiment, the hollow guide wire 1 is also provided with a first spiral wire 1d and a second spiral wire 1e, both of which are spiral-shaped, such as... Figure 1 As shown, the first winding wire 1d is located between the two distal electrode rings 1a of the guide wires, one end of the second winding wire 1e is connected to the first winding wire 1d, and the other end of the second winding wire 1e is located at the distal end of the guide wire 1.

[0046] In this embodiment, the area formed by the first winding wire 1d is a malleable area. The first winding wire 1d is made of 304 stainless steel. The initial state of the malleable area is a straight line. During use, the operator can bend this area into the desired shape as needed. The second winding wire 1e is made of tungsten wire, and the helical radius of the end of the second winding wire 1e connected to the first winding wire 1d gradually decreases from the end towards the far end of the guide wire 1. That is, the second winding wire 1e forms a gradually thinner shape from the direction near the guide wire 1 to the direction towards the far end of the guide wire 1.

[0047] Because the heart structures of different patient groups are different, the location of the coronary sinus ostium is not fixed. Their shapes and positions are different. In order to make the bipolar guidewire 1 used in this embodiment able to be adjusted according to the characteristics of the heart structure of different groups during the operation, the bipolar guidewire 1 can better enter the coronary sinus ostium, reducing the difficulty of operation for doctors during the operation.

[0048] In another embodiment, the second winding wire 1e and the first winding wire 1d are made of the same material, that is, the second winding wire 1e and the first winding wire 1d are made of a single winding wire, or the first winding wire 1d is also used as the second winding wire 1e. This embodiment can avoid the connection problem between winding wires of different materials.

[0049] like Figure 4 , Figure 5 As shown, the locking device 3 includes a tube body 3a, a soft ring 3b, and a cap 3c.

[0050] The pipe body 3a is a straight pipe. One end of the pipe body 3a has an external thread, and the inner wall of this end has a limiting part 3a1. The function of the limiting part 3a1 is to abut against the flexible ring 3b fitted inside this end, preventing the flexible ring 3b from advancing further into the pipe. Therefore, the flexible ring 3b is fitted inside one end of the pipe body 3a and abuts against the limiting part 3a1. The other end of the pipe body 3a has a Luer connector. The cap 3c is fitted onto one end of the pipe body 3a and has an internal thread corresponding to the external thread. The bottom end of the cap 3c has a compression part 3c1 that extends into one end of the pipe body 3a and abuts against the flexible ring 3b. The compression part 3c1 is sleeve-shaped, and the bottom end of the cap 3c has a hole that communicates with the compression part 3c1. Through the threaded connection between the cap 3c and the pipe body 3a, the compression part 3c1 compresses the flexible ring 3b, causing it to deform and the inner hole to shrink, thus achieving the function of compression and fixation.

[0051] Furthermore, the locking device 3 in this embodiment also includes a washer 3d. The washer 3d is disposed between the flexible ring 3b and the compression part 3c1. One end face of the washer 3d has an annular protrusion 3d1, and the other end face of the washer 3d has an annular groove 3d2. The flexible ring 3b has a flexible ring groove corresponding to the annular protrusion 3d1. The compression part 3c1 has a compression protrusion corresponding to the annular groove 3d2. The washer 3d with this structure can serve both a positioning and guiding function, and also enhance the sealing effect.

[0052] In use, the tube body 3a is fitted onto the proximal end of the guidewire 1, and the proximal electrode ring 1b of the guidewire passes through the flexible coil 3b and the hole. The Luer connector can fix the proximal end of the mapping catheter 2. The locking device 3 in this embodiment can fix and loosen the guidewire 1 and the mapping catheter 2 on the one hand, and does not affect the connection between the proximal electrode ring 1b of the guidewire and external equipment on the other hand.

[0053] Furthermore, it also includes a cable plug, one end of which is detachably connected to the distal electrode ring 1a, the proximal electrode ring 1b, or the distal or proximal electrode ring 2a of the calibration probe, while the other end of the cable plug is inserted into an external device. After the proximal electrode ring 1b of the guide wire emerges from the tube body 3a, the cable plug is then installed to connect to the external device.

[0054] Furthermore, such as Figure 6 As shown, this embodiment also includes a plug, which includes a housing, a compression spring, a pressure block 4a, a hose 4b, and a conductor 4c.

[0055] The housing has a cavity and a pressing part. A compression spring is located inside the cavity, with one end fixed to the bottom of the cavity and the other end facing the pressing part. A pressure block 4a is pressed onto the other end of the compression spring, and the top of the pressure block 4a is located at the pressing part. Pressing the pressing part causes the pressure block 4a to press the compression spring.

[0056] The flexible tube 4b passes through the pressure block 4a. There are two conductors 4c, which pass through the flexible tube 4b from both sides of the pressure block 4a. Both conductors 4c are connected to conductor wires 4d, and the conductor wires 4d extend from one end of the housing to connect with external equipment. The proximal end of the bipolar guidewire 1 is inserted into the flexible tube 4b from the other end of the housing, and the proximal electrode rings 1b of the two guidewires are in contact with the two conductors 4c located inside the flexible tube 4b, respectively.

[0057] Under the action of the compression spring, the hose 4b bends from a straight state; pressing the pressure block 4a, the hose 4b can return to a straight state.

[0058] When in use, after the bipolar guidewire 1 is inserted into the flexible tube 4b, the flexible tube 4b bends upward from a straight state into a bridge shape under the action of the compression spring, making it impossible to pull out the bipolar guidewire 1. If you want to pull out the bipolar guidewire 1, simply press the pressing part to make the pressure block 4a sink against the spring force, allowing the flexible tube 4b to return to a straight state, and then the bipolar guidewire 1 can be easily pulled out.

[0059] In other embodiments, the conductor 4c of the plug may be provided with one or more corresponding to the electrode ring. In yet another embodiment, the plug can also be used to connect to the proximal electrode ring 2b of the calibration.

[0060] Preferably, this embodiment also provides a third port 3a2 communicating with the tube body 3a on the side wall of the tube body 3a. The third port 3a2 can also be equipped with another Luer connector. When not in use, the other Luer connector is plugged with a plug. When in use, the plug is removed, and physiological saline is injected using a syringe for cleaning. Since the proximal electrode rings 1b of the guidewire have already passed through the holes, physiological saline does not come into contact with any electrode rings.

[0061] Preferably, in this embodiment, both the distal electrode ring 1a and the proximal electrode ring 1b of the guidewire are provided with bamboo-shaped adhesive 2e. Besides fixing the distal electrode ring 1a and the proximal electrode ring 1b, the bamboo-shaped adhesive 2e also fills the gaps created during the riveting process, thus providing a seal. Because the distal electrode ring 1a and the proximal electrode ring 1b have relatively sharp edges, they may damage blood vessels during movement and retraction. In this embodiment, the bamboo-shaped adhesive 2e can reduce the damage to the human body caused by the instrument itself, potentially lowering the surgical risk.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A hollow calibration electrode assembly, characterized in that, Includes guidewire, mapping catheter, and locking device; The guidewire is hollow, and a guidewire wire is installed inside the hollow guidewire; a guidewire distal electrode ring is provided on the distal sidewall of the guidewire, and a guidewire proximal electrode ring is provided on the proximal sidewall of the guidewire. The guidewire distal electrode ring and the guidewire proximal electrode ring are connected by the guidewire wire. The mapping catheter includes a hollow inner layer and an outer layer sleeved over the inner layer, with a mapping lead wire between the inner and outer layers; the distal sidewall of the mapping catheter is provided with a distal mapping electrode ring, and the proximal sidewall of the mapping catheter is provided with a proximal mapping electrode ring, which are connected by the mapping lead wire; the inner layer of the mapping catheter is sleeved on the guidewire. Adjusting the relative position of the guidewire and the mapping catheter can change the distance between the distal electrode ring of the guidewire and the distal electrode ring of the mapping catheter. The locking device includes a tube body, a flexible ring, and a cap. One end of the tube body has an external thread, and the inner wall of this end has a limiting part. The other end of the tube body has a Luer connector. The flexible ring is fitted inside one end of the tube body and abuts against the limiting part. The cap is fitted on one end of the tube body and has an internal thread corresponding to the external thread. The bottom of the cap has a compression part that extends into one end of the tube body and abuts against the flexible ring. The compression part is sleeve-shaped, and the bottom of the cap has a hole that communicates with the compression part. The tube body is fitted on the proximal end of the guidewire. The proximal electrode ring of the guidewire passes through the flexible ring and the hole. The Luer connector can fix the proximal end of the mapping catheter. It also includes a plug, which comprises a housing, a compression spring, a pressure block, a hose, a conductor, and a conductor wire; The housing has a cavity and a pressing part; a compression spring is located inside the cavity; a pressure block is pressed on the compression spring and also corresponds to the pressing part; a flexible tube passes through the pressure block; a conductor passes through the flexible tube from the side of the pressure block; a conductor wire extends from one end of the housing into the cavity and connects to the conductor; the proximal end of the guide wire or the mapping guide tube is inserted into the flexible tube from the other end of the housing, and the proximal electrode ring of the guide wire or the proximal electrode ring of the mapping guide tube contacts the conductor; The hose bends from a straight state under the action of the compression spring; pressing the pressure block will restore the hose to a straight state.

2. The hollow calibration electrode assembly according to claim 1, characterized in that, The locking device also includes a washer; the washer is disposed between the soft ring and the compression part; one end face of the washer is provided with an annular protrusion, and the other end face of the washer is provided with an annular groove; the soft ring is provided with a soft ring groove corresponding to the annular protrusion; the compression part is provided with a compression protrusion corresponding to the annular groove.

3. The hollow calibration electrode assembly according to claim 1, characterized in that, The side wall of the pipe is provided with a third port that communicates with the pipe body.

4. A hollow calibration electrode assembly according to claim 1, characterized in that, The guidewire is a dual-stage guidewire, with two electrode rings at the distal end and two corresponding electrode rings at the proximal end.

5. A hollow calibration electrode assembly according to claim 4, characterized in that, The hollow guide wire also has a first winding wire and a second winding wire, both of which are spiral in shape; the first winding wire is located between the two distal electrode rings of the guide wire, one end of the second winding wire is connected to the first winding wire, and the other end of the second winding wire is located at the distal end of the guide wire; the first winding wire is malleable; the second winding wire and the first winding wire are made of the same material or different materials.

6. A hollow calibration electrode assembly according to claim 1, characterized in that, Several distal electrode rings and several proximal electrode rings are provided for calibration, and they correspond to each other.

7. A hollow calibration electrode assembly according to claim 1, characterized in that, Both ends of the distal and proximal electrode rings of the guidewire are provided with bamboo-shaped adhesive.

8. A hollow calibration electrode assembly according to claim 1, characterized in that, It also includes a cable plug; one end of the cable plug is detachably connected to the distal electrode ring of the guidewire, the proximal electrode ring of the guidewire, the distal electrode ring of the calibration, or the proximal electrode ring of the calibration, and the other end of the cable plug is inserted into an external device.

9. A hollow calibration electrode assembly according to claim 1, characterized in that, The calibration guide tube is also equipped with a bending adjustment assembly, which includes a bending adjustment handle and a pull wire; The bending handle includes a gear, a handle, and two parallel racks with opposing teeth; the gear is located between the two racks and meshes with them; a clamping gap is provided between the shaft of the gear and the root of the racks; the racks and the gear are located on the handle. There are two pull wires, which are located between the inner and outer layers and distributed on both sides of the inner layer. One end of the pull wire is fixed to the distal end of the mapping guide tube, and the other end of the pull wire passes through the clamping gap and through the handle.

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