CN205306957U - OCT formation of image probe in machinery rotation type blood vessel - Google Patents

Abstract

A mechanically rotating intravascular OCT imaging probe relates to an optical scanning probe for mechanically rotating intravascular OCT imaging with a tiny size. Solve the technical problems of unstable rotational speed of the probe and twisting and deformation of imaging graphics caused by the catheter passing through highly stenotic lesions or curved blood vessel segments, the instability of the driving external force and the friction of the inner wall of the catheter, including probe catheters, and probe catheters The light-transmitting shell is socketed at the end, and an electromagnetic motor is also arranged in the light-transmitting shell; the electromagnetic motor includes a motor stator and a motor rotor; the motor stator is fixed to the inner wall of the light-transmitting shell, and the motor stator and the motor rotor move Socketing; the motor rotor is a cylindrical magnet with a reflective slope corresponding to the Green lens at the top. The built-in electromagnetic motor can not only complete the precise control of the motor, but also avoid the disadvantages caused by the traditional external motor connected to the guide wire to drive the probe rotation. It has the advantages of small size, high image resolution, and good imaging stability.

Description

A Mechanically Rotating Intravascular OCT Imaging Probe

technical field

The utility model relates to the technical field of intravascular imaging interventional diagnosis and treatment devices, in particular to a mechanically rotating intravascular OCT imaging optical scanning probe with a small size.

Background technique

Optical coherence tomography (Optical coherencetomography, OCT) is a kind of optical tomography technology, which uses the interference principle of light, usually uses near-infrared light to take pictures, and can scan optical scattering media such as biological tissues to obtain three-dimensional micron High-resolution optical cross-sectional images. OCT technology uses the time-of-flight method to measure the time delay of different reflective layers of the sample. Its core is the Michelson low-coherence interferometer, which uses the interference phenomenon between the reference light and the signal light pulse sequence of the tissue to detect different depth layers of tissue The structure is then scanned in the cross-section by the probe, and the obtained signal is processed by a computer to obtain a tomographic image of the sample. Commercial optical coherence tomography systems have a variety of applications, especially in ophthalmology to obtain detailed images of the retina. Recently, this technique has also been used in cardiology research, such as intravascular OCT, which can diagnose coronary artery disease. Current intravascular OCT catheters, like single-array IVUS intravascular ultrasound catheters, also require mechanical rotation. Typically, the rotation of the probe is driven by an external motor connected through a guide wire. The mechanical rotating probe uses an external motor and drive shaft to rotate the flat mirror mounted on the tip of the catheter. The rotation speed is usually 1800 rpm, and it can image at a speed of 100 frames per second. The currently used catheters are all in the form of a single track, which is fed into the segment to be imaged through a 0.014-inch guide wire. Because the guide wire is relatively rigid, the single-rail part at the front end of the catheter is relatively short, and the catheter is relatively soft, so the ability to pass twisted and severely stenotic lesions is relatively poor. Even if it passes barely, it will affect the guide wire due to the decline in torque transmission and support force At this time, the distortion of the image may be caused by the uneven rotation of the catheter.

Contents of the invention

To sum up, the purpose of this utility model is to solve the instability of the rotation speed of the probe caused by the instability of the driving external force and the friction of the inner wall of the catheter due to the catheter passing through a highly stenotic lesion or a curved blood vessel segment, and the imaging pattern is rotated and distorted. To solve the technical problems, a mechanically rotating intravascular OCT imaging probe is proposed.

In order to solve the technical problems proposed by the utility model, the technical solution adopted is: a mechanically rotating intravascular OCT imaging probe, including a probe catheter, a light-transmitting shell that is socketed with the end of the probe catheter, and placed in the probe catheter through the probe catheter. The optical fiber in the light-transmitting shell, and the Green lens corresponding to the optical fiber in the light-transmitting shell; it is characterized in that: an electromagnetic motor is also arranged in the light-transmitting shell; the electromagnetic motor includes a motor stator and a motor rotor The motor stator is fixed to the inner wall of the light-transmitting shell, and the motor stator and the motor rotor are movably socketed; the motor rotor is a cylindrical magnet with a reflective slope corresponding to the Green lens on the top.

The motor stator includes a set of dual-phase winding coils with an included angle of 90 degrees.

The reflective slope at the top of the motor rotor is a plane reflective medium film coated on the cylindrical magnet.

The included angle between the reflective slope at the top of the motor rotor and the axial direction of the motor rotor is 45 degrees.

The diameter of the probe catheter is 1.5-2 mm.

The probe conduit and the Green lens are socketed and fixed through a polytetrafluoroethylene tube sleeved on the optical fiber.

The optical fiber is a single-mode optical fiber.

The beneficial effects of the utility model are: the sample light is emitted from the single-mode optical fiber and focused by the Green lens, and finally reflected by the reflective slope at the top of the motor rotor, and is vertically incident on the blood vessel wall, and the incident light is driven by the electromagnetic motor to realize the reflection of the blood vessel wall. 360 degree rotation scan. A closed-loop control system can be built, and a miniature speed sensor is implanted into the lower end of the micro-rotor to measure the rotational position and speed of the rotor in real time. Combined with the closed-loop control system, the precise control of the rotor speed can be realized and synchronized with the imaging system. The utility model has a built-in electromagnetic motor, which can not only complete the precise control of the motor, but also avoid the disadvantages caused by the traditional external motor connected with the guide wire to drive the probe rotation, and has the advantages of small size, high image resolution, and good imaging stability. .

Description of drawings

Fig. 1 is the sectional structural representation of the utility model;

Fig. 2 is the schematic diagram of the three-dimensional enlarged structure of the electromagnetic motor of the present invention;

Fig. 3 is a cross-sectional enlarged schematic diagram of the electromagnetic motor of the present invention.

detailed description

Below in conjunction with accompanying drawing and preferred specific embodiment of the utility model, the structure of the invention will be further described.

Referring to Fig. 1 to Fig. 3, the mechanical rotary intravascular OCT imaging probe of the present invention includes a probe catheter 1, a light-transmitting shell 2 socketed with the end of the probe catheter 1, and inserted into the light-transmitting shell through the probe catheter 1 The single-mode optical fiber 3 in 2, the Green lens 4 corresponding to the single-mode optical fiber in the light-transmitting housing 2, and the electromagnetic motor 5 located in the light-transmitting housing 2.

The probe conduit 1 and the Green lens 4 are socketed and fixed through a polytetrafluoroethylene tube 6 sleeved on the single-mode optical fiber 3 . The electromagnetic motor 5 includes a motor stator 51 and a motor rotor 52; the motor stator 51 is fixed to the inner wall of the light-transmitting housing 2, and the motor stator 51 and the motor rotor 52 are movably socketed; The cylindrical magnet of the corresponding reflective slope 53, the reflective slope 53 at the top of the motor rotor 52 can be a plane reflective medium film coated on the cylindrical magnet; the reflective slope 53 at the top of the motor rotor 52 and the axial angle of the motor rotor are preferably 45° Degree; the motor stator 51 includes a set of two-phase winding coils 511, 512 with an included angle of 90 degrees. When a two-phase sinusoidal AC signal with a phase difference of 90° is loaded on the two-phase winding coils 511 and 512, the two coils 511 and 512 will generate a rotating magnetic field under the action of the sinusoidal AC signal, and the motor rotor 52 will follow the rotating magnetic field under the action of the rotating magnetic field. Rotate synchronously with the frequency of the AC signal. The sample light is emitted from the single-mode optical fiber 3 and focused by the Green lens 4. Finally, it is reflected by the reflective slope 53 on the top of the motor rotor 52 and is vertically incident on the blood vessel wall. The motor rotor 52 performs a 360-degree rotation process. , the incident light realizes 360-degree rotational scanning of the vessel wall.

The utility model does not need an external motor connected by a guide wire to drive the built-in plane mirror to rotate, which can not only complete the precise control of the motor, but also avoid the disadvantages caused by the traditional external motor connected with the guide wire to drive the probe to rotate. The diameter of the probe conduit is 1.5~2mm. The electromagnetic motor 5 at the front end of the OCT imaging probe of the utility model is a thin-necked micro-motor, and the motor stator 51 is wound by extremely thin wires in a certain arrangement. Smaller, can realize 360-degree OCT scanning imaging of the side view of the blood vessel wall; introduce a miniature rotational speed sensor implanted in the front end of the motor rotor 52, measure the rotational position and rotational speed of the motor rotor 52 in real time, and combine the closed-loop control system to realize the rotor Precise control of the rotational speed and synchronization with the imaging system.

Claims (7)

1. a mechanical rotation formula Ink vessel transfusing OCT image probe, includes probe catheter, with the light transmitting shell of probe catheter end socket, the optical fiber being placed in light transmitting shell through probe catheter, and is located at Green's lens corresponding with optical fiber in light transmitting shell; It is characterized in that: in described light transmitting shell, be also provided with electromagnetic motor; Described electromagnetic motor includes motor stator and motor rotor; Motor stator and light transmitting shell inwall are fixed, motor stator and motor rotor activity socket; Motor rotor is the cylindrical magnets that a top is provided with the reflective inclined-plane corresponding with Green's lens.

2. a kind of mechanical rotation formula Ink vessel transfusing OCT image probe according to claim 1, it is characterised in that: described motor stator includes the two-phase winding coil that one group of angle is 90 degree.

3. a kind of mechanical rotation formula Ink vessel transfusing OCT image probe according to claim 1, it is characterised in that: the reflective inclined-plane on described motor rotor top is the plane reflecting medium film being plated in cylindrical magnets.

4. a kind of mechanical rotation formula Ink vessel transfusing OCT image probe according to claim 1 or 3, it is characterised in that: the reflective inclined-plane on described motor rotor top and motor rotor axis angle is 45 degree.

5. a kind of mechanical rotation formula Ink vessel transfusing OCT image probe according to claim 1, it is characterised in that: described probe catheter diameter is at 1.5 ~ 2mm.

6. a kind of mechanical rotation formula Ink vessel transfusing OCT image probe according to claim 1, it is characterised in that: between described probe catheter and Green's lens, polyfluortetraethylene pipe by being placed on optical fiber socket-connects fixing.

7. a kind of mechanical rotation formula Ink vessel transfusing OCT image probe according to claim 1, it is characterised in that: described optical fiber is single-mode fiber.