CN218923523U

CN218923523U - Speed transfer device for guidewire delivery speed detection

Info

Publication number: CN218923523U
Application number: CN202222731633.2U
Authority: CN
Inventors: 王杨; 唐伟; 赵春莹
Original assignee: Weiya Medical Technology Suzhou Co ltd
Current assignee: Weiya Medical Technology Suzhou Co ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2023-04-28
Anticipated expiration: 2032-10-18

Abstract

The utility model discloses a speed transmission device for detecting the delivery speed of a guide wire. The speed transmission assembly is arranged on the supporting seat and comprises a roller and a roller shaft, the roller is fixedly arranged on the roller shaft, and the roller is used for contacting with the guide wire and rotating under the drive of the guide wire; wherein a guide wire aisle formed through the support seat is formed in the support seat, the guide wire aisle is provided with a guide wire supporting part, and the guide wire supporting part and the roller are positioned at two opposite sides of a guide wire passing through the guide wire aisle in use; during use of the speed transmission device, the roller of the speed transmission assembly abuts against one side of a guide wire passing through a guide wire passage, and the other side of the guide wire is supported on the guide wire supporting part, so that the roller can rotate under the drive of the guide wire.

Description

Speed transfer device for guidewire delivery speed detection

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a speed transmission device for detecting the delivery speed of a guide wire.

Background

Minimally invasive vascular intervention is a basic means for diagnosing and treating cardiovascular and cerebrovascular diseases, and most of vascular lesion diagnosis and vascular reconstruction operations carried out at present are carried out by the aid of the technology. The operation of a guidewire-catheter is central to minimally invasive vascular interventional procedures, which determine the quality of the procedure. Currently, interventional physicians manually perform the positioning of a guidewire-catheter within a patient's blood vessel by means of digital silhouette angiography imaging technique (DSA). Conventional passive guidewires, guide catheters, balloon catheters are basic instruments used in surgery.

During the operation, the doctor performs vascular puncture in the femoral artery or radial artery and leaves a vascular sheath as an inlet for the catheter to enter the blood vessel. The catheter is passed through the vascular sheath into the vessel in the patient, and the guidewire is passed from the passageway inside the catheter into the vessel. Control of the catheter, guidewire delivery, retraction, and rotation is typically accomplished by the interventional physician with his or her assistant two and four hands. During the guidewire delivery process, the physician can determine guidewire withdrawal, delivery and rotation by sensing the amount of resistance of the guidewire by hand.

At present, the use of a robot device for positioning a guide wire (a catheter or other instruments, hereinafter the same) has appeared on the market, which is beneficial to improving the precision and stability of the positioning operation, liberating medical staff from radiation, and avoiding additional injury of the medical staff caused by wearing thick and heavy lead clothing. To realize the motion control of the guide wire, the robot device firstly needs to realize the nondestructive clamping of the guide wire, and is difficult to compare with human body perception in the aspect of sensing the motion state of the guide wire. The traditional speed transmission device for detecting the delivery speed of the guide wire has the problems of complex structure, multiple influencing factors and damage to the guide wire due to extrusion of the guide wire.

Accordingly, there is a need in the art for a speed transfer device for guidewire delivery speed detection that has further improved structural, perceived accuracy.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and aims to provide a speed transmission device for detecting the delivery speed of a guide wire, which has the advantages of simple structure, less influence factors, reduced abrasion risk of the guide wire and capability of improving speed sensing precision.

To achieve the above object, the present utility model provides a speed transmission device for guide wire delivery speed detection, the speed transmission device comprising:

a speed transfer assembly; and

a support base;

the speed transmission assembly is arranged on the supporting seat and comprises a roller and a roller shaft, the roller is fixedly arranged on the roller shaft, and the roller is used for contacting with the guide wire and rotating under the drive of the guide wire;

wherein a guide wire aisle formed through the support seat is formed in the support seat, the guide wire aisle is provided with a guide wire supporting part, and the guide wire supporting part and the roller are positioned at two opposite sides of a guide wire passing through the guide wire aisle in use; during use of the speed transmission device, the roller of the speed transmission assembly abuts against one side of a guide wire passing through a guide wire passage, and the other side of the guide wire is supported on the guide wire supporting part, so that the roller can rotate under the drive of the guide wire.

By adopting the technical scheme of the utility model, the guide wire delivery speed detection device has a simple structure and few influencing factors for the guide wire delivery speed detection, so that the speed detection precision can be greatly improved. In addition, according to the detected guide wire delivery speed, the resistance of the guide wire in the delivery process can be fed back accurately in real time, so that the accurate control of guide wire delivery is realized.

Drawings

The utility model will be described in further detail with reference to the drawings and examples, in which

Fig. 1 is a perspective view illustrating the general structure of a speed sensing device according to a first embodiment of the present utility model;

fig. 2 is a perspective view illustrating an actual use state of the speed sensing device according to the first embodiment of the present utility model;

FIG. 3 is a perspective view of a speed sensing device speed transmission and detection assembly of the first embodiment;

FIG. 4 is an exploded perspective view of the speed transmission and detection assembly of the speed sensing device of the first embodiment;

FIG. 5A is a cutaway perspective view of the speed sensing device of the first embodiment;

FIG. 5B is a cut-away perspective view of the speed sensing device of the first embodiment with the speed transmission and detection assembly removed;

FIG. 6A is a perspective view of the upper end shield;

FIG. 6B is a perspective view of the upper end shield from the other side;

FIG. 7 is a perspective view of the lower end shield;

FIG. 8 is a perspective view of the bottom box;

FIG. 9 is a top view of the speed sensing device of the first embodiment in use, illustrating a structurally symmetrical guidewire support;

FIG. 10 is a top view of the speed sensing device of the first embodiment in use, illustrating the structurally asymmetric guidewire support;

FIG. 11 illustrates a modified embodiment of a mounting structure for a speed transfer assembly on a support base;

FIG. 12A illustrates another modified embodiment of a mounting structure for a speed transfer assembly on a support base;

FIG. 12B is an enlarged view of a portion of the mounting structure shown in FIG. 12A;

FIG. 13 illustrates a modified embodiment of a roller;

FIG. 14A illustrates a modified embodiment of a guidewire support;

FIG. 14B illustrates another modified embodiment of a guidewire support;

FIG. 15 is a perspective view of a speed sensing device of a second embodiment;

FIG. 16 is a perspective view of a second embodiment of a speed sensing device with a bottom box removed;

FIG. 17 is an exploded perspective view of the speed transmission and detection assembly of the speed sensing device of the second embodiment; and

fig. 18 is a perspective view of a speed sensing device speed transmission and detection assembly of a second embodiment.

Detailed Description

The speed sensing device, speed sensing method, and speed transmission device for detecting the delivery speed of a guide wire according to the present utility model will be described in detail. It should be noted herein that the embodiments of the present utility model are merely illustrative, which are merely illustrative of the principles of the present utility model and not in limitation thereof.

For convenience of description, terms such as up, down, front, rear, left, right, and the like are used in the specification, and these directional terms correspond to the orientations depicted in the figures, but do not necessarily correspond to the directions in which they are actually used.

Referring first to fig. 1 and 2, there is illustrated in perspective view the general structure of a speed sensing device according to a first embodiment of the present utility model, wherein fig. 2 illustrates the actual use state of the speed sensing device of the present utility model. As shown in fig. 1 and 2, the speed sensing device of the first embodiment includes a speed transmission and detection assembly 10 (see fig. 3 for the complete structure) and a support base 2. The speed transmission and detection assembly 10 includes a speed transmission assembly 1 and a speed detection assembly 26 (see fig. 4), the speed transmission assembly 1 including a roller 3 and a roller shaft 4, the roller 3 and the roller shaft 4 being fixedly mounted to each other. In the use state, the roller 3 is contacted with the guide wire 5 and is used for rotating under the drive of the guide wire and driving the roller shaft 4 to rotate together; the roller shaft 4 is arranged in connection with a rotational speed sensor of the speed detection assembly 26 for detecting the rotational speed of the roller shaft 4.

The supporting seat 2 comprises an upper end baffle 6, a lower end baffle 7 and a bottom box 8. The speed transmission and detection assembly 10 is mounted on the support base 2 in a linearly movable manner by means of guide means.

Referring next to fig. 3 and 4, wherein fig. 3 is a perspective view of the speed transmission and detection assembly and fig. 4 is an exploded perspective view of the speed transmission and detection assembly. As shown in fig. 3 and 4, the speed transmission and detection assembly 10 includes a speed transmission assembly 1 and a speed detection assembly 26, the speed transmission assembly 1 includes a roller seat including a roller seat body 11, an inner end roller shutter 14, and an outer end roller shutter 15, a roller 3, a roller shaft 4, and a screw 16. The roller seat body 11 has a screw hole 17 formed therein, and in an assembled state, the screw 16 is fitted into the screw hole. Guide protrusions 41 serving as sliders extending in the up-down direction are provided on both side surfaces of the roller seat body 11 opposite to each other to guide the linear movement of the speed transmission and detection assembly in cooperation with guide grooves serving as slide rails provided on the support seat as described below.

The roller 3 is fixedly mounted on the roller shaft 4 so that both can rotate together. The roller shaft 4 extends from two sides of the roller 3, and the inner end roller baffle 14 and the outer end roller baffle 15 are respectively arranged on the roller shaft 4 through bearings 18. The roller seat body 11 is formed with screw holes 19 and positioning holes 20 on both sides of the screw holes; screw holes 21 are formed in the inner end roller baffle 14, and positioning rods 25 are positioned at two sides of the screw holes 21 and respectively extend out of two sides of the inner end roller baffle; screw holes 22 and positioning holes 23 on both sides of the screw holes are formed in the outer roller shutter 15.

The speed detection assembly 26 includes a rotational speed sensor including a magnetic encoder 27 and a magnet 28; the speed sensing assembly 26 also includes a magnetic encoder housing including a magnetic encoder housing body 29 and a magnetic encoder cover 30. The magnetic encoder 27 is provided with an electric wire 31; the magnet 28 is fixedly mounted in a mounting hole 32 (see fig. 5A) formed in the end of the roller shaft 4. The magnetic encoder seat main body 29 is L-shaped, a mounting hole 33 for forming a part of the mounting space of the magnetic encoder 27 is formed on the vertical plate part, and screw holes 34 are formed on two sides of the mounting hole 33; the horizontal plate portion has a through hole 35 formed therein, from which the electric wire 31 of the magnetic encoder extends; the end surface of the horizontal plate portion facing the speed transmission assembly 1 is formed with screw holes 36 and positioning holes 37 located on both sides of the screw holes.

The magnetic encoder cover 30 is recessed toward one side of the magnetic encoder housing main body 29 so as to constitute an installation space of the magnetic encoder 27 together with the installation hole 33 of the magnetic encoder housing main body 29. The magnetic encoder cover 30 has a through hole 38 formed therein, through which the magnetic encoder 27 is exposed; screw holes 39 are formed in the magnetic encoder cover 30 on both sides of the through hole 38.

Referring to fig. 3, 4 and 5A, the assembly of the speed transmission and detection assembly 10 is illustrated. When the speed detecting assembly 26 is assembled, the electric wires 31 of the magnetic encoder 27 are led out from the through holes 35 on the magnetic encoder housing main body 29, the magnetic encoder 27 is placed in the installation space defined between the magnetic encoder housing main body 29 and the magnetic encoder cover 30, and the magnetic encoder cover 30 and the magnetic encoder housing main body 29 are fixed to each other by screwing the screws passing through the screw holes 39 on the magnetic encoder cover and the screw holes 34 on the magnetic encoder housing main body 29.

When the speed transmission assembly 1 is assembled, the magnet 28 is installed in the installation hole 32 at the end part of the roller shaft 4; and the inner end roller baffle 14 and the outer end roller baffle 15 are respectively arranged on the roller shaft 4 through bearings 18, and meanwhile, the positioning rod 25 on the inner end roller baffle positioned on one side of the roller seat main body 11 is respectively inserted into the positioning hole 20 on the roller seat main body 11 and the positioning hole 23 on the outer end roller baffle 15.

Then, the positioning rod 25 on the inner end roller baffle plate positioned at one side of the magnetic encoder 27 is inserted into the positioning hole 37 on the magnetic encoder seat main body 29; then, the screw 40 is inserted through the screw hole 22, the screw hole 19, and the screw hole 21, respectively, and screwed into the screw hole 36 of the magnetic encoder seat main body 29, thereby completing the assembly of the speed transmission and detection assembly.

The structure of the support base 2 is described below with reference to fig. 1, 2, 5A to 8, wherein fig. 5A is a cutaway perspective view of the speed sensing device of the first embodiment; FIG. 5B is a cut-away perspective view of the speed sensing device with the speed transmission and detection assembly removed; FIG. 6A is a perspective view of the upper end shield; FIG. 6B is a perspective view of the upper end shield from the other side; FIG. 7 is a perspective view of the lower end baffle; and figure 8 is a perspective view of the bottom box.

As shown in fig. 1, the support base 2 includes an upper end baffle 6, a lower end baffle 7, and a bottom box 8, wherein the lower end baffle 7 is installed between the upper end baffle 6 and the bottom box 8, and together define an installation space of the speed transmission and detection assembly 10, and the lower end baffle 7 is configured to be relatively dislocated with respect to the upper end baffle 6 and the bottom box 8 (see fig. 5A).

As shown in fig. 6A and 6B, a through hole 43 is formed in the middle of the upper end baffle 6, the through hole includes a rectangular hole 44 located above and a groove hole 45 located below, and the rectangular hole 44 and the groove hole 45 are penetrated in the up-down direction; the upper portion of the upper end baffle 6 is also formed with a circular hole 46 extending in the up-down direction, the circular hole 46 penetrating the rectangular hole and extending through the upper surface of the upper end baffle 6, and the screw 16 of the speed transmission assembly 1 extending through the circular hole 46.

On each of the left and right sides shown in the drawing of the through-hole 43, the upper end baffle 6 is formed with a screw hole 47 formed through the upper end baffle 6, respectively. Preferably, the screw holes 47 are stepped screw holes. In the assembled state, as shown in fig. 1 and 5A, the screw hole 47 is used to fit a set screw 48, and the screw head is accommodated in the large hole of the stepped screw hole 47.

With continued reference to fig. 6A and 6B, the right side wall of the illustrated rectangular aperture 44 is formed with a baffle 49 in the form of a step on the side facing the lower baffle 7, including a first baffle portion 50 and a second baffle portion 51, with a step 52 formed therebetween, and a threaded aperture 54 formed in the second baffle portion 51. The left side wall of the rectangular hole is also provided with a baffle plate, and the structure is symmetrical to that of the right side wall baffle plate, and the description thereof is omitted.

As shown in fig. 5A and 5B, the support base 2 further includes an assembly baffle 53, the assembly baffle 53 being in the form of a rectangular block with screw holes 87 formed thereon corresponding to the screw holes 54 on the second baffle portion 51, whereby the assembly baffle 53 can be secured to the upper end baffle 6 with screws 55 and spaced apart from the corresponding first baffle portion 50. Thus, a guide groove 56 is defined between the assembly shutter 53 and the first shutter portion 50, and the assembly shutter 53 and the first shutter portion 50 form a slide rail for guiding the speed transmission and detection assembly 10 to move linearly with respect to the support base in cooperation with the guide protrusions 41 serving as sliders on the left and right sides of the roller base body 11 (see fig. 5A). In order to reduce friction between the slider and the slide rail, the slider and the slide rail are preferably smoothed, such as mirror-finished.

Fig. 7 illustrates a lower end baffle 7 in cooperation with an upper end baffle 6. As shown in fig. 7, a through-hole 57 is formed in the middle of the lower end baffle 7, and includes a rectangular hole 88 located above and a groove-shaped hole 89 located below, the rectangular hole 88 and the groove-shaped hole 89 penetrating in the up-down direction, and the groove-shaped hole 89 corresponding to the groove-shaped hole 45 of the upper end baffle 6. On each of the left and right sides of the through-hole 57, the lower end baffle 7 is formed with two waist-shaped

holes

58 and 59, respectively, the waist-shaped holes 58 being used to pass through the guide rod 104 (see fig. 8), and the waist-shaped holes 59 being used to pass through the fixing screws 48 (see fig. 5A).

The lower end of the lower end baffle 7 is provided with a two-layered stepped portion 60 including a first stepped portion 61 located at the outer side and a second stepped portion 62 located at the inner side, the first stepped portion 61 having a first mounting surface 63 and a first surface 64, the second stepped portion 62 having a third mounting surface 65 and a third surface 66. The first step 61 has a through hole 67 formed in an inner side of a middle portion of the first mounting surface 63 to penetrate up and down, or has an arc-shaped recess formed therein for receiving a lower portion of the roller 3 of the speed sensing device in an assembled state of the speed sensing device, while the guide wire is positioned under the roller 3, and an outer circumference of the lower portion of the roller 3 is kept in contact with the guide wire and locally bends the guide wire. As a preferable option, as shown in fig. 7, the first mounting surface 63 of the first step portion 61 is a curved surface that is concave in the middle so that the guide wire is more gently transited to the lower outer peripheral edge of the roller 3. Preferably, the junction of the through hole 67 or the recess with the first mounting surface of the first step is smoothly transitioned, thereby deflecting the guide wire as smoothly as possible to avoid breakage of the guide wire.

As shown in fig. 6B, the upper end baffle 6 is provided with a third step portion 68 corresponding to the two-layered step portion 60 of the lower end baffle 7, thereby forming a second mounting surface 69, a fourth mounting surface 70, and a second surface 71. Wherein the second mounting surface 69 of the third step portion 68 of the upper end baffle 6 is adapted in shape and size in the front-rear direction to the first mounting surface 63 of the first step portion 61 of the lower end baffle 7; the fourth mounting surface 70 of the third step portion 68 of the upper end baffle 6 is adapted in shape and size in the front-rear direction to the third mounting surface 65 of the second step portion 62 of the lower end baffle 7.

Thus, when the upper end baffle 6 and the lower end baffle 7 are assembled, the second mounting surface 69 of the third step portion 68 of the upper end baffle 6 is bonded to the first mounting surface 63 of the first step portion 61 of the lower end baffle 7, and the fourth mounting surface 70 of the third step portion 68 of the upper end baffle 6 is bonded to the third mounting surface 65 of the second step portion 62 of the lower end baffle 7; at the same time, the second surface 71 of the third step portion 68 of the upper end baffle 6 is bonded to the third surface 66 of the second step portion 62 of the lower end baffle 7, and the plate surface 72 of the upper end baffle 6 is bonded to the plate surface 73 of the lower end baffle 7.

As shown in fig. 6A and 6B, below the groove hole 45, a cutout portion 75 is formed on the upper end baffle plate 6, and the cutout portion 75 is disposed symmetrically with respect to the groove hole 45, while being disposed symmetrically with respect to the through hole 67 (see fig. 7) on the first mounting surface 63 of the first step portion 61 of the lower end baffle plate 7. The notch 75 communicates with the groove hole 45, and in the assembled state of the upper end baffle 6 and the lower end baffle 7, the notch 75 also communicates with the through hole 67 on the first mounting surface 63 of the first step portion 61 of the lower end baffle 7; thereby, an arrangement space for the rollers 3 of the speed transmission assembly 1 is formed.

In order to form a guide wire passage through which the guide wire 5 passes, as shown in fig. 6A and 6B, a fourth stepped portion 76 is formed on the upper end baffle 6, the fourth stepped portion 76 being formed at the intersection of the second surface 71 and the second mounting surface 69 and including a stepped surface 77, the stepped surface 77 being adapted in shape to the first mounting surface 63 of the first stepped portion 61 of the lower end baffle 7, whereby, after the upper end baffle 6 and the lower end baffle 7 are assembled, a guide wire passage 78 (see fig. 1) having a substantially uniform cross section is formed.

Referring to fig. 1, 6A, 6B and 7, the bottom of the guide wire aisle is constituted by the first mounting surface 63 of the lower end baffle, and portions on both sides of the through hole 67 on the first mounting surface 63 serve as guide wire supporting portions. During use of the speed sensing device, the guide wire passes through the guide wire passageway, the roller 3 abuts the guide wire, causing localized bending of the guide wire and supporting of the portion of the guide wire adjacent the bending portion of the guide wire on the guide wire support, and maintaining the guide wire in a bent condition. In order to reduce friction between the guide wire and the guide wire channel or the guide wire support, the guide wire channel or the guide wire support is preferably smooth, such as mirror-finished.

With continued reference to fig. 6B, outside of the screw hole 47 of the upper end baffle 6, the upper end baffle 6 is formed with a blind hole 79 in which the end of the guide rod 104 fits.

Referring to fig. 8, fig. 8 is a perspective view of the bottom case 8. As shown in fig. 8, the bottom case 8 has a rectangular box shape, and a notch 80 for passing the electric wire 31 of the magnetic encoder is formed on a side wall of one end. Two bosses 81 are provided on both sides of the bottom wall, and screw holes 82 located at the inner side and guide rod fixing holes 83 located at the outer side are formed on the bosses 81, respectively, the screw holes 82 are used for connecting with the ends of the screws 48 (see fig. 5), and the guide rod fixing holes 83 are used for fixedly mounting guide rods 104. In the assembled state, the through-hole 43 of the upper end baffle 6, the through-hole 57 of the lower end baffle 7, and the inner space of the bottom case 8 define an installation space of the speed transmission and detection assembly 10.

Referring to fig. 5A and 5B, in assembling, first, the speed transmission and detection assembly 10 with the screw 16 removed is fitted from the through hole 43 of the upper end baffle 6 to the upper end baffle 6 as the mounting body of the speed transmission and detection assembly 10, and the guide projection 41 of the roller seat body is made to fit the first baffle portion 50 of the upper end baffle 6; the assembly block 53 is then installed and the assembly block 53 is secured to the upper block 6 using screws 55. Then, when the upper end baffle 6, the lower end baffle 7 and the bottom case 8 to which the speed transmission and detection unit 10 is attached are assembled, the second mounting surface 69, the fourth mounting surface 70 and the second surface 71 of the third stepped portion 68 of the upper end baffle 6 are respectively bonded to the first mounting surface 63, the third mounting surface 65 and the third surface 66 of the two-stage stepped portion 60 of the lower end baffle 7, and the plate surface 72 of the upper end baffle 6 is bonded to the plate surface 73 of the lower end baffle 7; thereafter, the bottom case 8 with the guide rods 104 fixed thereto is assembled with the upper end baffle 6 and the lower end baffle 7, the guide rods 104 are inserted into the waist-shaped holes 58 of the lower end baffle 7 and the blind holes 79 of the upper end baffle 6, respectively, and then the screws 48 are passed through the screw holes 47 of the upper end baffle 6, the waist-shaped holes 59 of the lower end baffle and screwed into the screw holes 82 of the bottom case 8, thereby assembling the upper end baffle 6, the lower end baffle 7 and the bottom case 8 together.

Finally, the screw 16 is connected with the roller seat and the upper end baffle 6, the screw 16 is firstly inserted into the round hole 46 formed on the upper end baffle and the spiral spring 85 is sleeved on the screw 16, and then the end part of the screw 16 is screwed into the threaded hole 17 of the roller seat main body 11 so as to be fixed relative to the roller seat; a nut 86 is then mounted on the other end of the screw 16 to complete the assembly of the speed sensing device. The screw 16 is in clearance fit with the circular hole 46 on the upper baffle plate, so that the speed transmission and detection assembly is allowed to linearly move relative to the supporting seat under the action of the acting force generated by the guide wire when the speed sensing device is in actual use, and the spiral spring 85 is utilized to bias the speed transmission and detection assembly towards the guide wire side. In addition, the axial position of the screw 16 can be adjusted by the nut 86, so as to adjust the force of the roller 3 against the guide wire and/or the degree of local bending of the guide wire; at the same time, the nut 86 also acts as a limiting device to limit the maximum amount of movement of the speed transmission and detection assembly and thus the roller mount, in a direction towards the guide wire under the influence of the coil spring 85.

With continued reference to fig. 1 and 5A, in actual use of the speed sensing device, in order to dispose the guide wire 5 in the guide wire aisle, the screw 48 may be unscrewed, and then the lower end baffle 7 may be downwardly displaced with respect to the upper end baffle 6 and the bottom box 8 using the waist-shaped

holes

58 and 59 formed in the lower end baffle 7, thereby creating a gap 90 between the second mounting surface 69 of the third stepped portion 68 of the upper end baffle 6 and the first mounting surface 63 of the first stepped portion 61 of the lower end baffle 7 (see fig. 5A and 5B). In this case, the guide wire 5 can be mounted in place via the gap 90. Thereafter, the lower end baffle 7 is moved upward relative to the upper end baffle 6 and the bottom case 8 until the second mounting surface 69 of the third stepped portion 68 of the upper end baffle 6 and the first mounting surface 63 of the first stepped portion 61 of the lower end baffle 7 are attached to each other, and then the lower end baffle 7 is re-fixed to the upper end baffle 6 and the bottom case 8 with the screws 48.

In the above-described embodiment, as shown in fig. 7, the first mounting surface 63 of the first step portion 61 on the lower end baffle 7 is in a laterally symmetrical form with respect to the through hole 67, and accordingly, the formed guide wire passage is also in a laterally symmetrical form, and the guide wire supporting portions located on both sides of the through hole 67 on the first mounting surface are also in a laterally symmetrical form. With such a structure, the roller 3 is in contact with the guide wire in bilateral symmetry when the speed sensing device is in actual use, as shown in fig. 9. However, the guide wire passageway may take other forms, such as a laterally asymmetrical form as shown in fig. 10, and in the case of fig. 10, the guide wire supporting portions on both sides of the through hole 67 take a laterally asymmetrical form, and accordingly the roller 3 is in laterally asymmetrical contact with the guide wire. The difference caused by the different guide wire support forms is the different points of stress of the roller 13.

The operation of the speed sensing device according to the first embodiment of the present utility model will be described.

Before operation, the speed sensing device is fixedly arranged at a certain part of a guide wire walking path, and the guide wire is arranged in a guide wire passage of the speed sensing device, so that the guide wire is delivered and retracted through the guide wire passage of the speed sensing device. The roller 3 is abutted against the guide wire and makes the guide wire locally bent, and makes the guide wire part adjacent to the bending part of the guide wire supported on the guide wire supporting part, and keeps the guide wire in a bending state; if desired, nuts 86 may be used to adjust the axial position of the screw 16 fixedly attached to the roller mount to effect adjustment of the force with which the roller 3 of the speed transfer assembly 1 abuts against the guide wire and/or the degree of local bending of the guide wire. During the surgical procedure to deliver the guidewire forward, the guidewire will drive the roller and thus the roller shaft, thereby driving the magnet 28 to rotate, whereby the magnetic encoder will detect/feedback the delivery speed of the guidewire; if the wire advance is blocked, the rotational speed of the roller 3 and the roller shaft 4 and thus the magnet 28 will slow down or even stop rotating, and the wire speed fed back by the magnetic encoder will also slow down, and the delivery of the wire should be suspended when the fed back wire speed drops to a certain limit value determined in advance.

In a first embodiment of the described speed sensing device, the essential features are that the speed transmission assembly is provided with a roller and a roller shaft rotating together with the roller, the roller being in contact with and driven to rotate by the guide wire; a rotational speed sensor is provided in association with the roller shaft for detecting the rotational speed of the roller shaft to thereby learn/feed back the delivery speed of the guidewire.

Therefore, the technical scheme of the present utility model is not limited to the specific form described.

In the first embodiment, in order to facilitate the installation of the guide wire on the speed sensing device, the upper end baffle 6 and the lower end baffle 7 are arranged to be capable of being displaced relative to each other, but the two end baffles can also be arranged not to be capable of being displaced relative to each other, and in actual use, the end of the guide wire is penetrated from one end of the guide wire passageway 78 of the speed sensing device; alternatively, the guide wire may be attached by detaching the upper end baffle 6 and the lower end baffle 7.

In the first embodiment described above, as shown in fig. 6B and 7, the lower end baffle 7 is provided with the first step portion 61 and the second step portion 62, and the upper end baffle 6 is provided with the third step portion 68. As a modified embodiment, the lower end baffle 7 may be provided with only the first step portion 61 without the second step portion, the first mounting surface 63 of the first step portion extending to the plate surface 73 of the lower end baffle 7; and the upper end baffle 6 is not provided with the third step portion 68. In the assembled state, the second mounting surface 69 of the upper end flap 6 is in abutment with the first mounting surface 63 of the lower end flap 7, while the plate surface 72 of the upper end flap 6 is in abutment with the plate surface 73 of the lower end flap 7. With this configuration, the guidewire channel, which is positioned below and aligned with the rollers of the speed transfer assembly, is formed by one of the following means:

1) The guide wire aisle is formed by encircling a groove formed on the second mounting surface of the upper end baffle and the first mounting surface of the lower end baffle, and a through hole, a notch or a concave part is formed on the first mounting surface at the position opposite to the roller;

2) The guide wire aisle is formed by encircling a groove formed on a first installation surface of the lower end baffle and a second installation surface of the upper end baffle, and a through hole or a notch or a concave part is formed at the position, opposite to the roller, of the bottom of the groove formed on the first installation surface;

3) The guide wire passageway is formed by encircling a groove formed in the second installation surface of the upper end baffle and a groove formed in the first installation surface of the lower end baffle, and a through hole, a notch or a concave part is formed in the bottom of the groove formed in the first installation surface at the position opposite to the roller.

In the first embodiment described above, the roller mount is connected to the screw 16, the screw 16 is fitted with a coil spring 85 and extends through the circular hole 46 in the upper end shield 6, and a nut 86 is mounted at its end facing away from the roller mount. As a modification of the above examples, the present utility model may employ other embodiments.

First, as an alternative, the roller seat may be fixedly mounted on the support seat. In this case, there is no need to provide some parts including the screw 16.

Fig. 11 illustrates another alternative, as shown in fig. 11, the speed transmission assembly 1 is provided with a screw 105, a through hole 106 is formed in the upper end baffle 6, and a screw hole 107 is formed in the roller seat body 11. In the assembled state, one end of the screw 105 is fixedly mounted in the threaded hole 107 of the roller seat body, the other end of the screw 105 extends through the through hole 106 of the upper end baffle 6, and the screw 105 is fixed by nuts 108 positioned at both sides of the through hole 106, so that the mounting position of the screw 105 of the speed transmission assembly and thus the roller with respect to the supporting seat can be adjusted. In the illustrated embodiment, the screw 105 is sleeved with a coil spring 109 for biasing the roller mount. Alternatively, the coil spring may be omitted.

Fig. 12A and 12B illustrate yet another alternative, as shown in fig. 12A and 12B, instead of the screw 16 in the first embodiment, the speed transmission assembly 1 shown in fig. 12A and 12B is provided with a shaft 110, which shaft 110 is fixedly mounted in a hole 111 of the upper end shield 6, on which a coil spring 112 is fitted; the roller seat body 11 of the speed transmission assembly is formed with a circular hole 113. In the assembled state, the shaft lever 110 is inserted into the round hole 113, and the shaft lever 110 is in clearance fit with the round hole 113, so that the roller seat of the speed transmission assembly 1 is allowed to move relative to the shaft lever 110; while the coil spring 112 has one end abutting against the stop surface 114 of the upper end stop 6 and the other end abutting against the upper surface of the roller mount to bias the roller mount and thus the speed transfer assembly 1.

Fig. 13 illustrates a modified embodiment of the roller, and the roller shown in fig. 13 is formed with flanges 115 on opposite sides of the surface thereof abutting the guide wire to prevent the guide wire from coming off the abutment surface of the roller.

As for the wire supporting portion, in the embodiment, the wire supporting portion is in the form of a plane or a curved surface and is provided on both sides of the roller in the direction of the wire travel path, but as a modified embodiment, the wire supporting portion in the form of a plane or a curved surface may be provided only on one side of the roller in the direction of the wire travel path. In addition, other forms of guidewire support may be used in addition to guidewire support in the form of a planar or curved surface. Fig. 14A and 14B illustrate other embodiments of a guidewire support, the guidewire support shown in fig. 14A comprising two guidewire support rollers or two guidewire support columns 116 symmetrically disposed relative to the rollers in the direction of the guidewire travel path; the guide wire supporting portion shown in fig. 14B includes a guide wire supporting roller or a guide wire supporting post 117 provided adjacent to the roller in the guide wire traveling path direction. The guide wire supporting portion illustrated in fig. 14A and 14B is not limited to a supporting roller or a supporting column which is specially used for providing the supporting function. For example, two or three speed sensing devices may be adopted in the present utility model, where two speed sensing devices are respectively located at two opposite sides of the guide wire and are sequentially arranged along the direction of the guide wire walking path; in the case of three speed sensing devices, one speed sensing device in the middle is positioned on one side of the guide wire, and the other two speed sensing devices are positioned on the other side of the guide wire and are respectively arranged on the front side and the rear side of the speed sensing device in the middle along the walking path direction of the guide wire. In the case of two or three speed sensing devices, the roller of one speed sensing device serves as a guide wire support for the other speed sensing device. Thus, the guidewire support illustrated in fig. 14A and 14B also covers the above-described situation.

A second embodiment of the speed sensing device of the present utility model is described below with reference to fig. 15-18.

In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

Referring to fig. 15 and 16, fig. 15 is a perspective view of a speed sensing device according to a second embodiment; fig. 16 is a perspective view of the speed sensing device of the second embodiment with the bottom box removed to show the structure of the speed sensing assembly and the auxiliary speed transmitting assembly. Similar to the first embodiment, the speed sensing device of the second embodiment includes a speed transmission assembly 201, a speed detection assembly 92 (see fig. 17), and a support base 122, wherein the support base 122 includes an upper end baffle 6, a lower end baffle 7, and a bottom box 123. In the speed sensing device of the second embodiment, the upper end baffle 6 and the lower end baffle 7 of the support base 122 are substantially identical to the overall structure of the upper end baffle and the lower end baffle of the first embodiment, and only the difference structure will be described below.

As shown in fig. 17, the speed transmission assembly 201 includes a roller housing including a roller housing body 211, a roller shutter 214, and a roller shutter 215, a roller 203, a roller shaft 204, and a screw 216. The roller seat body 211 has a screw hole (not shown) formed therein, and in an assembled state, one end of the screw 216 is fitted into the screw hole. Guide protrusions 241 serving as sliders extending in the left-right direction are provided on both side surfaces of the roller seat body 211 opposite to each other to guide the linear movement of the speed transmission assembly in cooperation with guide grooves serving as slide rails provided on the support seat.

The roller 203 is fixedly mounted on the roller shaft 204 so that both can rotate together. Roller shaft 204 extends from both sides of roller 203, and roller baffles 214 and 215 are mounted on roller shaft 204 by bearings 218, respectively. Screw holes (not shown) extending in the up-down direction are formed in the roller seat body 211, screw holes 221 are formed in the roller shutter 214, and screw holes 222 are formed in the roller shutter 215.

When the speed transmission assembly 201 is assembled, the roller baffle 214 and the roller baffle 215 are respectively installed on the roller shaft 204 through the bearings 218, and the screws 240 respectively pass through the screw holes 222 on the roller baffle 215 and the screw holes on the roller seat main body 211 and are screwed with the screw holes 221 on the roller baffle 214, thereby completing the assembly of the speed transmission assembly.

The speed sensing device of the second embodiment further includes an auxiliary speed transmission assembly 91, the auxiliary speed transmission assembly 91 being disposed between the speed transmission assembly 201 and the speed detection assembly 92.

Referring to fig. 17 and 18, the auxiliary speed transmission assembly 91 includes a driving bevel gear 93 fixedly connected to a roller shaft 204, a sliding bevel gear 94 drivingly engaged with the driving bevel gear 93, a transmission shaft 95, and a coil spring 101. The drive shaft 95 is a stepped shaft comprising a solid shaft 96 on the side of the sliding bevel gear 94 and a hollow shaft 97 on the side facing away from the sliding bevel gear 94, the hollow shaft 97 having an outer diameter greater than the diameter of the solid shaft 96, thereby forming a step therebetween. The solid shaft 96 is formed with a hole for mounting a pin 98; the sliding bevel gear 94 includes an integrally formed sleeve 99 with an elongated bore 100 formed in the sleeve 99.

In the assembled state of the drive shaft 95 and the sliding bevel gear 94, the sleeve 99 of the sliding bevel gear 94 is fitted over the solid shaft 96 of the drive shaft, the pin 98 is mounted on the solid shaft 96 in the elongated hole 100 of the sleeve 99, and the coil spring 101 is located between the step and the end of the sleeve 99, see fig. 18. Thereby, movement of the sliding bevel gear 94 towards the driving bevel gear 93 is restricted by means of the pin 98, but movement of the sliding bevel gear 94 away from the driving bevel gear 93 is allowed, while the coil spring 101 applies a bias to the sliding bevel gear 94 to ensure reliable engagement of the sliding bevel gear 94 with the driving bevel gear 93.

The speed sensing assembly 92 is fixedly mounted on and supported by the support 103, and the speed sensing assembly 92 includes a rotatable shaft 102, a magnet mounted on the rotatable shaft, a magnetic encoder (not shown), and a housing 150 for mounting the foregoing components, the speed sensing assembly 92 also being referred to as a rotatable shaft magnetic encoder. The rotation shaft 102 is fixedly connected with the hollow shaft 97 of the transmission shaft 95 and is rotated by the transmission shaft 95.

As shown in fig. 15 and 16, the bottom case 113 of the support base 122 is a case for mounting the auxiliary speed transmission assembly 91, the speed detection assembly 92, the support 103, etc., and has a hole formed therein for allowing the driving bevel gear 93 to pass therethrough. In the assembled state of the speed sensing device, the upper end baffle 6 and the lower end baffle 7 may be fixed to the bottom box 123 by screws passing through the screw holes 125.

The operation of the speed sensing device according to the second embodiment of the present utility model will be described.

Before operation, the speed sensing device is fixedly arranged at a certain part of a guide wire walking path, and the guide wire is arranged in a guide wire passage of the speed sensing device, so that the guide wire is delivered and retracted through the guide wire passage of the speed sensing device. The roller 203 abuts against the guide wire and locally bends the guide wire, and supports the guide wire portion adjacent to the bent portion of the guide wire on the guide wire supporting portion, and maintains the guide wire in a bent state; the axial position of the roller mount can be adjusted if desired by means of nuts 86 (see fig. 5A) to achieve adjustment of the force with which the roller 203 abuts against the guide wire and/or the degree of local bending of the guide wire. During the forward delivery of the guide wire by the operation, the guide wire drives the roller to rotate along the roller shaft, and the roller shaft drives the rotating shaft 102 of the speed detection assembly 92 to rotate through the auxiliary speed transmission assembly 91, so that the magnetic encoder feeds back the delivery speed of the guide wire; if the advancing of the guide wire is blocked, the rotational speed of the roller 203 and the roller shaft 204 and thus the rotational shaft 102 may slow down or even stop rotating, while the speed of the guide wire fed back by the magnetic encoder may also slow down, and the delivery of the guide wire should be suspended when the fed back guide wire speed drops to a certain limit value determined in advance.

During operation of the speed sensing device of the second embodiment, when the delivery of the guide wire is blocked, a force is transmitted to the roller, and in the case that the speed transmission assembly is arranged to be linearly movable, the speed transmission assembly may be moved, so that the driving bevel gear 93 is driven to move; by providing the sliding bevel gear 94 and biasing the sliding bevel gear 94 with the coil spring 101, the speed transmission assembly can be adapted to such linear movement of the driving bevel gear 93 and to reliably engage the driving bevel gear 93 with the sliding bevel gear 94.

In a second embodiment of the described speed sensing device, the essential features are that the speed transmission assembly is provided with a roller and a roller shaft rotating together with the roller, the roller being in contact with and driven to rotate by the guide wire; the rotation of the roller shaft is output to the rotating shaft through a transmission mechanism (namely, an auxiliary speed transmission assembly), and the rotation speed of the rotating shaft is detected by using a rotation speed sensor arranged in a correlated way so as to obtain/feed back the delivery speed of the guide wire.

For example, the transmission (i.e., the auxiliary speed transfer assembly) is not limited to the particular form of construction described, but may take on various other forms of transmission; a sliding bevel gear 94 serving as a driven gear may also be fixedly mounted on the drive shaft 95.

In the above-described first and second embodiments, the rotation speed sensor includes the magnetic encoder for detecting the rotation speed of the roller shaft or the rotation shaft, and it should be noted herein that the rotation speed sensor is not limited to the specific structural form described, but may take any form of sensor that can be used to detect the rotation speed of the rotation shaft, such as an optoelectronic rotation speed sensor, a hall rotation speed sensor, a variable reluctance rotation speed sensor, or the like; furthermore, the rotation output member as the object to be detected is not limited to the described roller shaft or rotation shaft, but other rotation members adapted to the employed rotation speed sensor may be used as the rotation output member, which are connected to and rotated in synchronization with the roller shaft or the output shaft, depending on the employed specific rotation speed sensor.

Regarding the connection relationship of the roller, the upper end baffle, the lower end baffle, the wire supporting portion, and the roller seat with the upper end baffle 6 through the screw 16 (or the screw 105, the shaft 110, the screw 216), the embodiments described in connection with the first embodiment are equally applicable to the second embodiment, and the description thereof is omitted for the sake of brevity.

In the first and second embodiments described above, when the speed sensing device is actually used, the roller presses the guide wire to locally bend the guide wire and keep the guide wire in a bent state, so that the contact area between the roller and the guide wire is increased, the roller contacts the guide wire with proper force, and the roller is ensured to synchronously rotate along with the movement of the guide wire to ensure the detection accuracy. However, the present utility model is not limited to this, and the roller may be brought into contact with the guide wire without bending the guide wire, and the roller may be brought into contact with the guide wire with an appropriate force, whereby the desired effect can be achieved.

In the second embodiment, the assembled upper end baffle 6, lower end baffle 7, speed transmission assembly 201 (with or without screw 216) and assembly baffle 53 form a speed transmission device, which can be configured as a separate assembly, and can be used in the solution of the second embodiment, or can be used in combination with other speed detection assemblies/rotation speed sensors, including the speed detection assembly described in connection with the first embodiment. In the case of being a separate component, some structures may be appropriately modified, such as the waist-shaped hole 58 of the lower end baffle 7 being formed as a fixing circular hole for fixing the guide rod 104, and the waist-shaped hole 59 being formed as a screw hole; correspondingly, the blind hole 79 of the upper end baffle 6 may be formed as a waist-shaped blind hole or a waist-shaped hole penetrating the upper end baffle 6, and the screw hole 47 is formed as a waist-shaped screw hole. In this way, after the screws 48 are loosened, the lower end baffle 7 is allowed to relatively shift with respect to the upper end baffle 6 without the upper end baffle 6 and the lower end baffle 7 being detached from each other.

The speed sensing method of the present utility model will be described with reference to the speed sensing device described above.

According to the utility model, a method for detecting a guidewire delivery speed during guidewire delivery comprises the steps of:

(1) Providing a roller with a roller shaft at a portion of a guide wire travel path, contacting the roller with a guide wire such that the roller is rotatable driven by the delivered guide wire, wherein the roller shaft rotates in synchronization with the roller;

(2) A rotational speed sensor is provided for detecting a rotational speed of a rotational output member, the rotational output member comprising one of:

the roller shaft;

a rotating element mounted on the roller shaft for rotation in synchronization with the roller shaft;

a rotation shaft connected to the roller shaft via a transmission mechanism;

a rotating element mounted on a rotating shaft connected to the roller shaft via a transmission mechanism and rotating in synchronization with the rotating shaft;

(3) When the guide wire is delivered forwards, the guide wire drives the roller to rotate, and the roller drives the rotary output element to synchronously rotate;

(4) And detecting the rotating speed of the rotary output element by using the rotating speed sensor, so as to obtain the delivery speed of the guide wire.

The speed sensing device and the speed sensing method are described above by taking a guide wire as an example, and it should be specifically noted that the speed sensing device and the speed sensing method of the present utility model are not limited to use with a guide wire, but can be used with any elastically bendable similar component, including but not limited to, a wire rope, a cable, an optical fiber, a enteroscope, a gastroscope, and the like.

The utility model has been described above with reference to specific embodiments with reference to the accompanying drawings, but this is for illustrative purposes only and the utility model is not limited thereto. It will thus be apparent to those skilled in the art that various changes and modifications may be made within the technical spirit and scope of the utility model, and these changes and modifications should also be construed as falling within the scope of the utility model, which is defined by the claims and their equivalents.

Claims

1. A speed transfer device for guidewire delivery speed detection, the speed transfer device comprising:

a speed transfer assembly; and

a support base;

2. The speed transfer device of claim 1, wherein the speed transfer assembly is mounted on the support base in one of the following ways:

1) The speed transmission assembly is fixedly arranged on the supporting seat along the direction of facing towards and away from the guide wire;

2) The speed transmission component is fixedly arranged on the supporting seat in a position adjustable way along the direction towards and away from the guide wire,

3) The speed transmission assembly is mounted on the support base in a linearly movable manner by a guide device, and the support base is provided with a biasing device for biasing the speed transmission assembly in a direction towards the guide wire.

3. A speed transmission device according to claim 1 or 2, wherein the guide wire support is arranged such that the guide wire is locally bendable under the action of the roller; during use of the speed transfer device, the rollers of the speed transfer assembly abut the guide wire traveling through the guide wire passageway, causing localized bending of the guide wire and maintaining the guide wire in a bent state.

4. A speed transmission device according to claim 3, wherein a portion of the guide wire adjacent the bending portion of the guide wire is supported on the guide wire support.

5. A speed transmission device according to claim 4, wherein the wire supporting portion supports the wire on both sides of the roller in the direction of the wire travel path, and a through hole or a notch or a recess is formed in the wire supporting portion at a position opposite to the roller to allow the wire to be locally bent.

6. The speed transmission device according to claim 5, wherein the wire supporting portion is disposed symmetrically with respect to the roller in a direction of a wire traveling path.

7. The speed transfer device of claim 6, wherein the wire support includes two wire support surfaces symmetrically disposed with respect to the roller in the direction of the wire travel path.

8. The speed transfer device of claim 6, wherein the wire support comprises two wire support rollers or two wire support columns symmetrically disposed relative to the roller in the direction of the wire travel path.

9. A speed transfer device as claimed in claim 2, wherein the speed transfer assembly is mounted on the support in a linear movable manner by guide means, the speed transfer assembly comprising a roller mount, the roller being rotatably mounted at one end of the roller mount by the roller shaft, the other end of the roller mount abutting the biasing means, the guide means comprising a slider provided on opposite sides of the roller mount and a slide rail provided on the support in cooperation with the slider.

10. A speed transmission device according to claim 9, wherein the other end of the roller seat is formed with a guide hole extending in the linear movement direction of the speed transmission assembly, the support seat is provided with a guide rod extending in parallel with the guide hole, the guide rod is inserted into the guide hole, the guide rod is in clearance fit with the guide hole, and a biasing spring serving as the biasing means is fitted over the guide rod.

11. A speed transmission device according to claim 10, wherein the other end of the roller seat comprises a shaft, the end of the shaft facing away from the roller seat is provided with an external thread, the support seat is provided with a through hole, the shaft extends through the through hole, the end of the shaft extending out of the through hole is provided with a nut, the shaft and the through hole are in clearance fit, a biasing spring serving as the biasing device is sleeved on the guide rod, and the nut abuts against a stop surface of the support seat under the action of the biasing device.

12. A speed transmission device as claimed in claim 2, wherein the speed transmission assembly is fixedly mounted on the support base in a position adjustable in a direction toward and away from the guide wire, the speed transmission assembly comprising a roller seat, the roller being rotatably mounted at one end of the roller seat by means of the roller shaft, the other end of the roller seat comprising a shaft, the end of the shaft being formed with an external thread, the support base being provided with a through-hole, the shaft being adjustably fixed in position relative to the support base by means of nuts located on both sides of the through-hole.

13. A speed transfer device as claimed in claim 12, wherein the speed transfer assembly is linearly movable relative to the support base by guide means comprising a slider disposed on opposite sides of the roller base and a slide rail disposed on the support base cooperating with the slider.

14. A speed transfer device according to any one of claims 9 to 11 and 13, wherein the support base comprises an upper end baffle and a lower end baffle, the speed transfer assembly being mounted on the upper end baffle in a linearly movable manner by guide means, the speed transfer assembly being located in a mounting space formed by the assembly of the upper end baffle and the lower end baffle.

15. The speed transfer device of claim 14, wherein the upper end shield and the lower end shield are removably secured to each other with the guidewire passage portion exposed for easy installation of the guidewire.

16. The speed transfer device of claim 14, wherein an end of the lower end shield adjacent the guidewire channel has a first step extending from the lower end shield toward the upper end shield, the first step including a first mounting surface; an end face of one end of the upper end baffle adjacent to the guide wire aisle forms a second mounting surface matched with the first mounting surface, and the first mounting surface and the second mounting surface are attached to each other in an assembled state of the supporting seat;

Wherein the guidewire channel is formed by one of:

1) The guide wire aisle is formed by encircling a groove formed on the second mounting surface with the first mounting surface, and the first mounting surface is used as the guide wire supporting part and is provided with a through hole, a notch or a concave part at a position opposite to the roller;

2) The guide wire aisle is formed by encircling a groove formed on the first mounting surface and the second mounting surface, the bottom of the groove formed on the first mounting surface is used as the guide wire supporting part, and a through hole, a notch or a concave part is formed at the position opposite to the roller;

3) The guide wire aisle is formed by encircling a groove formed on the second mounting surface and a groove formed on the first mounting surface, the bottom of the groove formed on the first mounting surface is used as the guide wire supporting part, and a through hole, a notch or a concave part is formed at a position opposite to the roller.

17. The speed transmission device according to claim 14, wherein an end of the lower end baffle adjacent to the guide wire passage is formed with a two-layered stepped portion protruding from the lower end baffle toward the upper end baffle side, the two-layered stepped portion including a first stepped portion located outside and a second stepped portion located inside, the first stepped portion having a first mounting surface, the second stepped portion having a third mounting surface, the first mounting surface and the third mounting surface having a fifth surface facing the upper end baffle therebetween;

A third step portion recessed relative to the lower end baffle is formed at an end portion of the upper end baffle adjacent to the guide wire aisle, whereby a second mounting surface adapted to the first mounting surface, a fourth mounting surface adapted to the third mounting surface, and a sixth surface facing the lower end baffle between the second mounting surface and the fourth mounting surface are formed at an end portion of the upper end baffle adjacent to the guide wire aisle; in an assembled state of the support base, the first mounting surface and the second mounting surface are attached to each other, the third mounting surface and the fourth mounting surface are attached to each other, and the fifth surface and the sixth surface are attached to each other;

at the junction of the second mounting surface and the sixth surface of the upper end baffle, the upper end baffle is partially cut away, thereby forming the guide wire aisle in an assembled state of the upper end baffle and the lower end baffle; wherein the first mounting surface of the lower end baffle plate is used as the guide wire supporting part, and a through hole, a notch or a concave part is formed at a position opposite to the roller.

18. A speed transmission device as claimed in claim 17, wherein the cut-out portion of the upper end shield is rectangular in cross-section.

19. A speed transmission device according to any one of claims 16 to 18, wherein the upper and lower end baffles are fixedly connected in a relatively movable manner, allowing relative displacement of the upper and lower end baffles in a direction substantially perpendicular to the guidewire channel such that the first mounting surface is spaced from the second mounting surface to form a guidewire mounting gap through the guidewire channel through which a guidewire may be mounted in the guidewire channel.

20. The speed transmission device according to claim 19, wherein in an assembled state of the upper end baffle plate and the lower end baffle plate, the upper end baffle plate and the lower end baffle plate are fixed by screws, a screw hole is formed in one of the upper end baffle plate and the lower end baffle plate, and a waist-shaped screw hole extending in a direction in which the upper end baffle plate and the lower end baffle plate are relatively displaced is formed in the other of the upper end baffle plate and the lower end baffle plate.

21. The speed transmission device according to claim 14, wherein the upper end baffle is formed with a through-hole constituting a part of the installation space, a baffle plate in the form of a step is formed on a side wall of the through-hole opposite to each other in the direction of the guide wire passage, the baffle plate is located on a side of the through-hole facing the lower end baffle plate, and includes a first baffle plate portion remote from the side wall and a second baffle plate portion adjacent to the side wall, a step is formed between the two baffle plate portions, and a screw hole is formed on a plate surface of the second baffle plate portion facing away from the lower end baffle plate; the supporting seat further comprises a component baffle plate in the form of a rectangular baffle plate, a screw hole corresponding to the screw hole in the second baffle plate part is formed in the component baffle plate, the component baffle plate is fixed on the second baffle plate part by using screws, and the component baffle plate and the first baffle plate part form the sliding rail together.

22. A speed transmission device according to any one of claims 1 to 3, wherein flanges are formed on opposite sides of the surface of the roller that abuts the guide wire, for preventing the guide wire from coming out of engagement with the abutment surface of the roller.