An intravascular ultrasound catheter based on medical precision instruments

Abstract

This invention relates to an intravascular ultrasound catheter based on a precision medical instrument, belonging to the field of ultrasound catheter technology. It includes a sheath and a middle catheter. A support tube is fixed inside the sheath, and a guidewire passes through the support tube. A flexible drive shaft is rotatably sleeved outside the support tube. An ultrasound probe is fixed to the right end of the flexible drive shaft, and an adjusting column is fixed to the left end. A connecting sleeve is fixed to the proximal end of the sheath. A groove is formed on the rear side wall of the connecting sleeve at the left end of the adjusting column. Multiple toothed blocks are arranged circumferentially inside the groove. A rotating sleeve is sleeved on the outer wall of the connecting sleeve. A fixing seat is symmetrically fixed on the side wall of the rotating sleeve at the position corresponding to the toothed blocks. The fixing seat and the rotating sleeve are threadedly connected to a screw. By setting the adjusting column, groove, toothed blocks, rotating sleeve, screw, abutment, and toothed blocks, the torsional stiffness of the flexible drive shaft can be adjusted according to the degree of bending. A clamping mechanism, damping mechanism, scale, and limiting plate are included to facilitate guidewire steering control.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic catheter technology, and in particular to an intravascular ultrasonic catheter based on a precision medical instrument. Background Technology

[0002] Intravascular ultrasound catheters are important precision instruments used in interventional diagnosis and treatment to assess vascular lesions. They insert an ultrasound probe into the blood vessel lumen to perform a 360-degree circumferential scan of the vessel wall and plaque, generating high-resolution cross-sectional images. In clinical use, the ultrasound catheter needs to be guided by a guidewire to safely advance within the tortuous blood vessel. At the same time, a flexible drive shaft needs to transmit the rotational power of the external retraction device to the ultrasound probe to ensure that the probe can still rotate stably and provide imaging in the tortuous section of the blood vessel.

[0003] However, existing devices still have some shortcomings in use: On the one hand, there are individual differences in the condition of patients' blood vessels. When the blood vessels are highly curved, excessive torsional stiffness can easily cause vascular damage or probe jamming, while insufficient torsional stiffness will result in insufficient rotational power transmission efficiency, affecting imaging quality. The torsional stiffness of the flexible drive shaft is not easy to adjust according to individual differences in blood vessel curvature. On the other hand, when controlling the guidewire rotation, the instrument's image is usually magnified. The operator relies on experience to perceive the rotation angle of the guidewire, which can easily lead to over-rotation, requiring repeated adjustments, which is inconvenient to operate and reduces guidance efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an intravascular ultrasound catheter based on a precision medical instrument to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An intravascular ultrasound catheter based on a precision medical instrument includes: a sheath and a middle catheter. A support tube is fixed inside the sheath, and a guidewire passes through the support tube. A flexible drive shaft is rotatably sleeved outside the support tube. An ultrasound probe is fixed to the right end of the flexible drive shaft, and an adjusting column is fixed to the left end. A connecting sleeve is fixed to the proximal end of the sheath. A groove is formed on the rear sidewall of the connecting sleeve at the left end of the adjusting column. Multiple teeth are arranged circumferentially inside the groove. A rotating sleeve is sleeved on the outer wall of the connecting sleeve. A fixing seat is symmetrically fixed at the position corresponding to the toothed block. The fixing seat and the rotating sleeve are connected by a threaded screw. The end of the screw inside the rotating sleeve is rotatably connected to a stop block. Multiple toothed blocks are fixed on one side of the stop block. The stop block and the rotating sleeve are limited to slide by a guide rod. A handle is provided through the left side of the rotating sleeve. A connector is fixed at the left end of the handle. A positioning mechanism is provided between the rotating sleeve and the connecting sleeve. A clamping mechanism is symmetrically provided through the side wall of the handle. A damping mechanism is provided between the handle and the rotating sleeve.

[0006] Optionally, the gap thickness between the outer wall of the left end of the adjusting column and the inner wall of the sheath is greater than the total thickness of the abutment block and the second toothed block, and the difference between the opening depth of the groove and the thickness of the first toothed block is not less than the total thickness of the abutment block and the second toothed block.

[0007] Optionally, the outer wall of the handle is provided with a threaded section, and the point where the rotating sleeve passes through the handle is provided with an internal thread corresponding to the threaded section. The tightening direction of the handle is the same as the rotation direction of the external retraction device.

[0008] Optionally, the positioning mechanism includes a second fixed seat symmetrically fixed to the side wall of the rotating sleeve. The second fixed seat and the side wall of the rotating sleeve are slidably connected through a limit rod. The limit rod has a T-shaped structure. One end of the limit rod is connected to the second fixed seat by a spring. The outer wall of the connecting sleeve is provided with multiple annular grooves along the axial direction. One end of the limit rod is inserted into one of the annular grooves.

[0009] Optionally, the clamping mechanism includes a fixed base three symmetrically fixed to the side wall of the handle, the fixed base three and the side wall of the handle are slidably connected to a clamping block through a pressure rod, and the clamping block is connected to the inner wall of the handle by a spring.

[0010] Optionally, the clamping block is rotatably connected to a plurality of rollers on the side near the guide wire, and the rotation direction of the rollers is the same as the feeding direction of the guide wire.

[0011] Optionally, the left end face of the rotating sleeve is provided with a scale along the circumferential direction, the side wall of the handle is fixed with a limiting plate, and the side wall of the limiting plate is provided with an indicator arrow.

[0012] Optionally, the damping mechanism includes a damping disc, which is fixed to one end of the handle located inside the rotating sleeve. The left side of the damping disc has multiple slots arranged in a circular array, and the edges of the slots are rounded. The inner wall of the rotating sleeve has multiple elastically sliding blocks embedded at the corresponding slot positions.

[0013] Optionally, the damping mechanism further includes a rotating ring, which is connected to the right side wall of the damping disc by a spring, and the rotating ring rotates in contact with the inner wall of the rotating sleeve.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, an adjusting column, a groove, a toothed block one, a rotating sleeve, a screw, a stop block, and a toothed block two are set up to adjust the torsional stiffness of the flexible transmission shaft. When it is necessary to adapt to the curvature of the blood vessel, the operator rotates the screw so that the toothed block two enters the groove but does not mesh with the toothed block one. At this time, the axial sliding of the rotating sleeve drives the adjusting column to slide through the cooperation between the toothed block two and the inner wall of the groove, thereby adjusting the tension state of the flexible transmission shaft, changing its torsional stiffness, and enabling the flexible transmission shaft to maintain good torsional transmission performance in the curved blood vessel.

[0015] The above scheme includes a clamping mechanism, a damping mechanism, a scale, and a limiting plate to facilitate guide wire steering control. The operator can clamp and fix the guide wire by pressing down the clamping block with a natural grip. The rotation direction of the roller is the same as the guide wire feeding direction, so that the guide wire can remain stable and be smoothly fed in the axial direction after clamping. When rotating the handle, the indicator arrow on the limiting plate matches the scale on the left end face of the rotating sleeve, which makes it easy for the operator to control the rotation angle of the guide wire. At the same time, the slot and the block on the damping plate cooperate to form intermittent rotational damping, so that the operator can get a clear rotational feel. The rotating ring and the spring provide axial displacement damping to prevent the handle from accidentally moving axially during rotation. Attached Figure Description

[0016] Figure 1 This is a schematic internal cross-sectional view of the present invention; Figure 2 for Figure 1 Enlarged view of the structure of part A in the middle; Figure 3 for Figure 1 Enlarged view of the structure of section B; Figure 4 This is a schematic diagram of the structure of the proximal end of the sheath and the connecting sleeve portion of the present invention; Figure 5 This is a schematic diagram of the structure of the adjusting column part of the present invention; Figure 6 This is a schematic diagram of the structure of the abutment block and the toothed block of the present invention; Figure 7 This is a schematic diagram of the structure of the rotating sleeve part of the present invention; Figure 8 This is a schematic diagram of the grip and damping mechanism of the present invention; Figure 9 for Figure 8 Enlarged view of the structure of section C; Figure 10 This is a schematic diagram of the structure of the clamping component of the present invention; Figure 11 This is a schematic diagram of the overall structure of the present invention.

[0017] Reference numerals: 1. Sheath; 2. Support tube; 3. Guide wire; 4. Flexible drive shaft; 5. Ultrasonic probe; 6. Adjusting column; 7. Connecting sleeve; 8. Groove; 9. Tooth block one; 10. Rotating sleeve; 11. Fixed seat one; 12. Screw; 13. Abutment block; 14. Tooth block two; 15. Handle; 151. Limiting plate; 16. Connecting head; 17. Positioning mechanism; 171. Fixed seat two; 172. Limiting rod; 173. Annular groove; 18. Clamping mechanism; 181. Fixed seat three; 182. Clamping block; 183. Roller; 19. Damping mechanism; 191. Damping disc; 192. Slot; 193. Clamping block; 194. Rotary ring; 20. Middle guide tube. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0019] like Figures 1 to 11As shown, an embodiment of the present invention provides an intravascular ultrasound catheter based on a precision medical instrument, comprising: a sheath 1 and a middle catheter 20. The sheath 1 is inserted into the middle catheter 20. A support tube 2 is fixed inside the sheath 1, and a guide wire 3 is inserted inside the support tube 2 to guide the sheath 1 forward in the blood vessel. A flexible drive shaft 4 is rotatably sleeved on the outside of the support tube 2 to transmit the rotational power of an external retraction device. An ultrasound probe 5 is fixed to the right end of the flexible drive shaft 4 for ultrasound detection of the blood vessel, generating a cross-sectional image of the blood vessel in conjunction with an external instrument. An adjusting column 6 is fixed to the left end of the sex drive shaft 4. The adjusting column 6 is movably disposed in the inner cavity of the proximal end of the sheath tube 1 and can slide and rotate. A connecting sleeve 7 is fixed to the proximal end of the sheath tube 1. A groove 8 is formed on the rear side wall of the connecting sleeve 7 through the left end of the adjusting column 6. Multiple toothed blocks 9 are arranged circumferentially inside the groove 8. A rotating sleeve 10 is fitted on the outer wall of the connecting sleeve 7. A fixing seat 11 is symmetrically fixed on the side wall of the rotating sleeve 10 at the position corresponding to the toothed blocks 9. The fixing seat 11 and the rotating sleeve 10 are threadedly connected to a screw 12. One end of the screw 12 is located inside the rotating sleeve 10. A stop block 13 is rotatably connected, and multiple toothed blocks 14 are fixed on one side of the stop block 13. The stop block 13 and the rotating sleeve 10 are limited and slidable by a guide rod. When the screw 12 is rotated so that the toothed blocks 14 engage with the toothed blocks 9, the rotation of the rotating sleeve 10 can drive the adjusting column 6 to rotate. When the screw 12 is rotated so that the toothed blocks 14 enter the groove 8 but do not engage with the toothed blocks 9, the sliding of the rotating sleeve 10 can drive the adjusting column 6 to slide. When the screw 12 is rotated so that the toothed blocks 14 disengage from the groove 8, the action of the rotating sleeve 10 does not affect the adjusting column 6. The left side of the rotating sleeve 10... A handle 15 is provided through the side, and a connector 16 is fixed to the left end of the handle 15 for connecting to an external retraction device. A positioning mechanism 17 is provided between the rotating sleeve 10 and the connecting sleeve 7 for axial positioning after the rotating sleeve 10 drives the adjusting column 6 to slide. A clamping mechanism 18 is symmetrically provided through the side wall of the handle 15 for clamping the guide wire 3 to facilitate the turning operation of the guide wire 3. A damping mechanism 19 is provided between the handle 15 and the rotating sleeve 10 to maintain the initial position of the handle 15 and enhance the adjustment feel by rotating damping when rotating the guide wire 3.

[0020] Specifically, during the use of the intravascular ultrasound catheter, the sheath 1 is guided forward within the blood vessel by the guidewire 3. When a separate turning operation of the guidewire 3 is required, the operator rotates the screw 12 to completely disengage the toothed block 14 from the groove 8. At this time, the rotation and sliding of the rotating sleeve 10 will not be transmitted to the adjusting column 6. The clamping mechanism 18 clamps and fixes the guidewire 3. The operator can turn the guidewire 3 by rotating the handle 15. The damping mechanism 19 provides rotational damping between the handle 15 and the rotating sleeve 10. On the one hand, it keeps the initial position of the handle 15 stable, preventing accidental rotation and excessive axial displacement. On the other hand, the damping force enhances the operating feel when rotating the guidewire 3, making it easier to precisely control the turning angle of the guidewire 3. When the sheath 1 reaches the target position under the guidance of the guidewire 3, the clamping mechanism 18 is released, releasing the fixation of the guidewire 3. According to the degree of curvature of the flexible transmission shaft 4 within the blood vessel, the operator rotates the screw 12 to allow the toothed block 14 on the abutment block 13 to enter the groove. 8. However, it does not mesh with the toothed block 9. At this time, the axial sliding of the rotating sleeve 10 can drive the adjusting column 6 to slide synchronously through the engagement of the toothed block 2 14 with the inner wall of the groove 8, thereby adjusting the tension state of the flexible transmission shaft 4 and changing its torsional stiffness to adapt to the bending of the blood vessel. This facilitates better transmission of torsional force when connecting the retraction device later. After the axial position is adjusted, the positioning mechanism 17 axially positions the rotating sleeve 10 and the connecting sleeve 7. When it is necessary to connect with the external retraction device and perform rotational detection, the handle 15 is fixed to the rotating sleeve 10. Then, the operator connects the connector 16 to the external retraction device and then rotates the screw 12 to make the toothed block 2 14 mesh with the toothed block 9 in the groove 8. At this time, the rotational power of the external retraction device is transmitted to the rotating sleeve 10 through the connector 16 and the handle 15. The rotation of the rotating sleeve 10 drives the adjusting column 6 to rotate through the meshing of the toothed block 2 14 and the toothed block 9, thereby driving the flexible transmission shaft 4 and the ultrasound probe 5 to rotate, and performing circumferential ultrasound detection on the blood vessel.

[0021] The gap thickness between the outer wall of the left end of the adjusting column 6 and the inner wall of the sheath 1 is greater than the total thickness of the abutment block 13 and the second toothed block 14. The difference between the opening depth of the groove 8 and the thickness of the first toothed block 9 is not less than the total thickness of the abutment block 13 and the second toothed block 14, so that the second toothed block 14 can completely disengage from the groove 8. At the same time, when the second toothed block 14 is completely inside the groove 8, it can not mesh with the first toothed block 9, and can only drive the adjusting column 6 to move through axial sliding to adjust the tension state of the flexible transmission shaft 4, thereby adjusting the torsional stiffness of the flexible transmission shaft 4.

[0022] The outer wall of the handle 15 is provided with a threaded section. The rotating sleeve 10 and the handle 15 pass through each other and are provided with internal threads corresponding to the threaded section. The tightening direction of the handle 15 is the same as the rotation direction of the external retraction device. When the connector 16 needs to be connected to the external retraction device, push the handle 15 to the right so that the thread on the outside of the handle 15 moves to the internal thread of the rotating sleeve 10. Then rotate the handle 15 to connect it with the rotating sleeve 10 as a whole. The connector 16 is connected to the external retraction device and the rotational power is transmitted to the rotating sleeve 10 through the handle 15. At this time, rotate the screw 12 so that the second tooth block 14 meshes with the first tooth block 9. The rotation of the rotating sleeve 10 can drive the adjusting column 6 to rotate, and then drive the flexible transmission shaft 4 and the ultrasonic probe 5 to rotate.

[0023] The positioning mechanism 17 includes a second fixed seat 171 symmetrically fixed to the side wall of the rotating sleeve 10. The second fixed seat 171 and the side wall of the rotating sleeve 10 are slidably connected through a limit rod 172. The limit rod 172 has a T-shaped structure. One end of the limit rod 172 is connected to the second fixed seat 171 by a spring. The outer wall of the connecting sleeve 7 has multiple annular grooves 173 along the axial direction. One end of the limit rod 172 is inserted into one of the annular grooves 173. The spring force makes the limit rod 172 and the annular groove 173 closely abut against each other to limit the axial movement. Pulling the limit rod 172 outward can quickly release the limit. At the same time, the setting of the annular groove 173 ensures that the rotation of the rotating sleeve 10 is not affected by the connecting sleeve 7.

[0024] Specifically, when adjusting the torsional stiffness of the flexible drive shaft 4, the operator rotates the screw 12, causing the toothed block 14 on the abutment 13 to enter the groove 8 but not engage with the toothed block 9. Since the gap thickness between the outer wall of the left end of the adjusting column 6 and the inner wall of the sheath 1 is greater than the total thickness of the abutment 13 and the toothed block 14, and the difference between the opening depth of the groove 8 and the thickness of the toothed block 9 is not less than the total thickness of the abutment 13 and the toothed block 14, the toothed block 14 can completely enter the groove 8 without engaging with the toothed block 9. At this time, the axial sliding of the rotating sleeve 10 drives the adjusting column 6 to slide synchronously through the cooperation between the toothed block 14 and the inner wall of the groove 8, thereby adjusting the tension state of the flexible drive shaft 4 and changing its torsional stiffness to adapt to the curvature of the blood vessel.

[0025] Furthermore, after the axial position is adjusted to the correct position, the positioning mechanism 17 axially locks the rotating sleeve 10. The limiting rod 172 is inserted into the corresponding annular groove 173 on the outer wall of the connecting sleeve 7 under the action of the spring force. Through the tight contact between the limiting rod 172 and the annular groove 173, the rotating sleeve 10 is locked in the current axial position. Multiple annular grooves 173 are opened along the outer wall of the connecting sleeve 7, so that the rotating sleeve 10 can be positioned in different axial positions. At the same time, the annular groove 173 is a circumferentially continuous structure. When the rotating sleeve 10 rotates, the end of the limiting rod 172 slides along the annular groove 173, which will not interfere with the rotational movement of the rotating sleeve 10. When it is necessary to release the axial lock, the operator pulls the limiting rod 172 outward to disengage its end from the annular groove 173, and the limiting position can be quickly released.

[0026] Next, when it is necessary to connect with the external retraction device and perform rotational detection, the operator pushes the handle 15 to the right, so that the threaded section on the outside of the handle 15 moves to the internal thread of the rotating sleeve 10. The handle 15 is rotated to connect with the rotating sleeve 10 as a whole. Then the connector 16 is connected to the external retraction device. The tightening direction of the handle 15 is the same as the rotation direction of the external retraction device to ensure that the connection will not loosen during the rotational detection. Then the screw 12 is rotated so that the second tooth block 14 meshes with the first tooth block 9 in the groove 8. The rotational power of the external retraction device is transmitted to the rotating sleeve 10 through the connector 16 and the handle 15. The rotation of the rotating sleeve 10 drives the adjusting column 6 to rotate through the meshing of the second tooth block 14 and the first tooth block 9, which in turn drives the flexible transmission shaft 4 and the ultrasound probe 5 to rotate, performing circumferential ultrasound detection on the blood vessels.

[0027] The clamping mechanism 18 includes a fixed base 3 181 symmetrically fixed to the side wall of the handle 15. The fixed base 3 181 and the side wall of the handle 15 are slidably connected to a clamping block 182 through a pressure rod. The clamping block 182 is connected to the inner wall of the handle 15 by a spring. Initially, the clamping block 182 is kept loose from the guide wire 3 under the action of the spring. When it is necessary to adjust the direction of the guide wire 3, the pressure rod of the clamping block 182 is pressed down by the natural gripping action of the handle 15, so that the clamping block 182 is close to the guide wire 3 and clamps it, which facilitates the rotation operation.

[0028] Multiple rollers 183 are rotatably connected to the side of the clamping block 182 near the guide wire 3. The rotation direction of the rollers 183 is the same as the feeding direction of the guide wire 3, so that when the guide wire 3 is adjusted after clamping, it can be fixed in a specific direction for feeding.

[0029] The left end face of the rotating sleeve 10 is provided with a scale along the circumference. The side wall of the handle 15 is fixed with a limit plate 151. The side wall of the limit plate 151 is provided with an indicator arrow, which makes it easy for the operator to control the rotation angle of the guide wire 3.

[0030] The damping mechanism 19 includes a damping disc 191, which is fixed to one end of the handle 15 located inside the rotating sleeve 10. The left side of the damping disc 191 has multiple slots 192 arranged in a circular array, with the edges of the slots 192 being rounded. The inner wall of the rotating sleeve 10 is embedded with multiple elastic sliding blocks 193 at the positions corresponding to the slots 192. Rotational damping is formed by the cooperation of the blocks 193 and the slots 192.

[0031] The damping mechanism 19 also includes a rotating ring 194, which is connected to the right side wall of the damping disk 191 by a spring. The rotating ring 194 rotates against the inner wall of the rotating sleeve 10, and axial displacement damping is formed by the spring between the rotating ring 194 and the rotating sleeve 10.

[0032] Specifically, during the guide wire 3 turning operation, the clamping block 182 is pressed down by a natural gripping gesture, causing the clamping block 182 to approach and clamp the guide wire 3. Multiple rollers 183, rotatably connected to the side of the clamping block 182 closest to the guide wire 3, contact the surface of the guide wire 3. The rotation direction of the rollers 183 is the same as the feeding direction of the guide wire 3, ensuring that the guide wire 3 maintains a stable clamping state and can be smoothly fed axially without jamming when adjusting its direction after clamping. When the operator rotates the handle 15, the indicator arrow on the side wall of the limiting plate 151 matches the scale on the left end face of the rotating sleeve 10, facilitating precise control of the guide wire 3's rotation angle. During the rotation of the handle 15, the damping disc 191 fixed to the end of the handle 15 rotates synchronously with the handle 15. The left circular... Multiple slots 192 formed by the array cooperate with the locking blocks 193 that are elastically slidably connected to the inner wall of the rotating sleeve 10. When the handle 15 rotates, the locking blocks 193 slide out of the current slot 192, overcome the elastic force, and lock into the next slot 192, forming intermittent rotational damping. This allows the operator to obtain a clear rotational feel and facilitates precise control of the guide wire 3's turning angle. The edges of the slots 192 are rounded to ensure smooth entry and exit of the locking blocks 193 and avoid jamming. On the other hand, the rotating ring 194 is connected to the right side wall of the damping disc 191 through a spring and rotates against the inner wall of the rotating sleeve 10. When the handle 15 has an axial displacement tendency, the spring between the rotating ring 194 and the inner wall of the rotating sleeve 10 provides axial displacement damping, keeping the axial position of the handle 15 basically stable and preventing accidental axial movement during rotation.

[0033] The working principle of the technical solution provided by this invention is as follows: In use, the sheath 1 is inserted into the catheter 20 and guided forward within the blood vessel by the guidewire 3. When it is necessary to change the direction of the guidewire 3, the operator presses down the lever of the clamping block 182 with a natural grip, causing the clamping block 182 to move inward against the spring force and clamp the guidewire 3. The roller 183 on the clamping block 182 rotates in the same direction as the guidewire 3 is inserted, ensuring that the guidewire 3 remains stable after clamping and can be smoothly inserted axially. The operator can then rotate the handle 15 to change the direction of the guidewire 3. During operation, the indicator arrow on the limit plate 151 matches the scale on the left end face of the rotating sleeve 10, facilitating precise control of the rotation angle. At the same time, the damping mechanism 19 provides bidirectional damping. The slot 192 on the damping disc 191 cooperates with the block 193 on the inner wall of the rotating sleeve 10 to form intermittent rotational damping, giving the operator a clear rotational feel. The rotating ring 194 is connected to the damping disc 191 via a spring and abuts against the inner wall of the rotating sleeve 10, providing axial displacement damping to prevent the handle 15 from accidentally moving axially during rotation.

[0034] Once the sheath 1 reaches the target position, the clamping block 182 is released to release the fixation of the guidewire 3. Based on the curvature of the flexible drive shaft 4 within the blood vessel, the operator rotates the screw 12, causing the second toothed block 14 to enter the groove 8 but not engage with the first toothed block 9. Because the gap thickness between the outer wall of the left end of the adjusting column 6 and the inner wall of the sheath 1 is greater than the total thickness of the abutment block 13 and the second toothed block 14, and the difference between the opening depth of the groove 8 and the thickness of the first toothed block 9 is not less than the total thickness of the abutment block 13 and the second toothed block 14, the second toothed block 14 can completely enter the groove 8 without engaging with the first toothed block 9. When the rotating sleeve 10 is in place, the axial sliding of the rotating sleeve 10 is driven by the engagement of the toothed block 14 with the inner wall of the groove 8, which in turn drives the adjusting column 6 to slide synchronously, thereby adjusting the tension state of the flexible transmission shaft 4 and changing its torsional stiffness to adapt to the bending of the blood vessel. After the axial position is adjusted to the correct position, the limiting rod 172 of the positioning mechanism 17 is inserted into the annular groove 173 corresponding to the outer wall of the connecting sleeve 7 under the action of the spring, locking the rotating sleeve 10 in the current axial position. The annular groove 173 is a circumferentially continuous structure. When the rotating sleeve 10 rotates, the end of the limiting rod 172 slides along the annular groove 173, which will not interfere with the rotational motion.

[0035] When it is necessary to connect to the external retraction device and perform rotational detection, the operator pushes the handle 15 to the right, so that the threaded section on the outside of the handle 15 moves to the internal thread of the rotating sleeve 10. The handle 15 is rotated to connect with the rotating sleeve 10 as a whole. Then the connector 16 is connected to the external retraction device. The tightening direction of the handle 15 is the same as the rotation direction of the external retraction device to ensure that the connection will not loosen during the rotational detection. Then the screw 12 is rotated so that the second tooth block 14 meshes with the first tooth block 9 in the groove 8. The rotational power of the external retraction device is transmitted to the rotating sleeve 10 through the connector 16 and the handle 15. The rotation of the rotating sleeve 10 drives the adjusting column 6 to rotate through the meshing of the second tooth block 14 and the first tooth block 9, which in turn drives the flexible transmission shaft 4 and the ultrasound probe 5 to rotate, performing circumferential ultrasound detection on the blood vessel and generating a cross-sectional image of the blood vessel in conjunction with the external instrument.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An intravascular ultrasound catheter based on a precision medical instrument, characterized in that, include: The sheath (1) and the middle catheter (20) are provided. A support tube (2) is fixed inside the sheath (1). A guide wire (3) is threaded through the support tube (2). A flexible drive shaft (4) is rotatably sleeved on the outside of the support tube (2). An ultrasonic probe (5) is fixed at the right end of the flexible drive shaft (4). An adjusting column (6) is fixed at the left end of the flexible drive shaft (4). A connecting sleeve (7) is fixed at the proximal end of the sheath (1). A groove (8) is formed on the rear side wall of the connecting sleeve (7) through the left end of the adjusting column (6). Multiple toothed blocks (9) are arranged circumferentially inside the groove (8). The outer wall of the connecting sleeve (7) is... A rotating sleeve (10) is fitted on the sleeve. A fixing seat (11) is symmetrically fixed on the side wall of the rotating sleeve (10) at the position of the toothed block (9). The fixing seat (11) and the rotating sleeve (10) are connected by a threaded screw (12). One end of the screw (12) located inside the rotating sleeve (10) is rotatably connected to a stop block (13). Multiple toothed blocks (14) are fixed on one side of the stop block (13). The stop block (13) and the rotating sleeve (10) are limited to sliding by a guide rod. A handle (15) is provided through the left side of the rotating sleeve (10). A connector (16) is fixed at the left end of the handle (15). A positioning mechanism (17) is provided between the rotating sleeve (10) and the connecting sleeve (7), a clamping mechanism (18) is symmetrically provided through the side wall of the handle (15), and a damping mechanism (19) is provided between the handle (15) and the rotating sleeve (10).

2. The intravascular ultrasound catheter based on a precision medical instrument according to claim 1, characterized in that, The thickness of the gap between the outer wall of the left end of the adjusting column (6) and the inner wall of the sheath (1) is greater than the total thickness of the abutment block (13) and the second tooth block (14). The difference between the opening depth of the groove (8) and the thickness of the first tooth block (9) is not less than the total thickness of the abutment block (13) and the second tooth block (14).

3. The intravascular ultrasound catheter based on a precision medical instrument according to claim 1, characterized in that, The outer wall of the handle (15) is provided with a threaded section, and the through-hole of the rotating sleeve (10) and the handle (15) is provided with an internal thread corresponding to the threaded section. The tightening direction of the handle (15) is the same as the rotation direction of the external retraction device.

4. The intravascular ultrasound catheter based on a precision medical instrument according to claim 1, characterized in that, The positioning mechanism (17) includes a second fixed seat (171) symmetrically fixed to the side wall of the rotating sleeve (10). The second fixed seat (171) and the side wall of the rotating sleeve (10) are connected by a limit rod (172) through which a sliding connection is made. The limit rod (172) has a T-shaped structure. One end of the limit rod (172) is connected to the second fixed seat (171) by a spring. The outer wall of the connecting sleeve (7) is provided with a plurality of annular grooves (173) along the axial direction. One end of the limit rod (172) is inserted into one of the annular grooves (173).

5. The intravascular ultrasound catheter based on a precision medical instrument according to claim 1, characterized in that, The clamping mechanism (18) includes a fixed base three (181) symmetrically fixed to the side wall of the handle (15). The fixed base three (181) and the side wall of the handle (15) are slidably connected by a pressure rod to a clamping block (182). The clamping block (182) is connected to the inner wall of the handle (15) by a spring.

6. The intravascular ultrasound catheter based on a precision medical instrument according to claim 5, characterized in that, The clamping block (182) is rotatably connected to a plurality of rollers (183) on the side near the guide wire (3), and the rotation direction of the rollers (183) is the same as the feeding direction of the guide wire (3).

7. The intravascular ultrasound catheter based on a precision medical instrument according to claim 1, characterized in that, The left end face of the rotating sleeve (10) is provided with a scale along the circumferential direction, and the side wall of the handle (15) is fixed with a limiting plate (151), and the side wall of the limiting plate (151) is provided with an indicator arrow.

8. The intravascular ultrasound catheter based on a precision medical instrument according to claim 1, characterized in that, The damping mechanism (19) includes a damping disc (191), which is fixed to one end of the handle (15) located inside the rotating sleeve (10). The left side of the damping disc (191) has multiple slots (192) arranged in a circular array. The edges of the slots (192) are rounded. The inner wall of the rotating sleeve (10) is embedded with multiple elastic sliding blocks (193) at the positions corresponding to the slots (192).

9. An intravascular ultrasound catheter based on a precision medical instrument according to claim 8, characterized in that, The damping mechanism (19) also includes a rotating ring (194), which is connected to the right side wall of the damping disc (191) by a spring, and the rotating ring (194) rotates in contact with the inner wall of the rotating sleeve (10).

Images