WO2016167204A1 - Optical probe - Google Patents

Optical probe Download PDF

Info

Publication number
WO2016167204A1
WO2016167204A1 PCT/JP2016/061648 JP2016061648W WO2016167204A1 WO 2016167204 A1 WO2016167204 A1 WO 2016167204A1 JP 2016061648 W JP2016061648 W JP 2016061648W WO 2016167204 A1 WO2016167204 A1 WO 2016167204A1
Authority
WO
WIPO (PCT)
Prior art keywords
portion
optical
direction
optical system
mold
Prior art date
Application number
PCT/JP2016/061648
Other languages
French (fr)
Japanese (ja)
Inventor
大 佐々木
芳享 為國
Original Assignee
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2015-083897 priority Critical
Priority to JP2015083897 priority
Priority to JP2015155591A priority patent/JP2016202866A/en
Priority to JP2015-155591 priority
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority claimed from US15/566,148 external-priority patent/US20180087893A1/en
Publication of WO2016167204A1 publication Critical patent/WO2016167204A1/en

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated

Abstract

This optical probe, which can be easily produced and is capable of obtaining high-resolution tomographic images, is equipped with a proximal end connected to an OCT device and a distal end for emitting observation light, and is further equipped with: an optical fiber; a GRIN lens that functions as a light-collecting optical system and as a deflecting optical system and is optically connected to the optical fiber at the distal end; a sheath that has a curved-surface section extending in a first direction and exhibiting curvature in a cross-section perpendicular to the first direction, houses the optical fiber and the GRIN lens in the first direction, and laterally emits the deflected observation light through the curved-surface section; and a compensation unit that is housed in the sheath, extends in the first direction throughout a range including the GRIN lens and part of the optical fiber, and compensates for the optical aberration produced when transmitting the observation light through the curved-surface section.

Description

The optical probe

The present invention relates to an optical coherence tomography (Optical Coherence Tomography: OCT) to an optical probe used in.

As a method for measuring the fault structure of an object such as a biological, optical coherence tomography (OCT) it has been known. In OCT measurement optical probe is inserted in the vicinity of the object, observation light from the optical probe is irradiated. Observation light reflected back at the object is obtained by the optical probe.

The optical probe includes a sheath that transmits the observation light, is disposed within the sheath, an optical fiber for guiding the observation light between the proximal and distal ends of the optical probe to deflect the observation light on the side of the optical probe comprising a deflection optics. In this case, the observation light deflected by the deflecting optical system passes through the side wall of the sheath. If the sheath is a cylindrical shape, the side walls are in the longitudinal direction is a shape having no curvature, with a curvature in the direction perpendicular to the longitudinal direction. At this time, the observation light is lensed at a portion having a curvature of the sheath, the beam shape of the observation light becomes an elliptical shape, the resolution of the tomographic image acquired is lowered. To address this problem, JP2004-223269 (Patent Document 1), JP2011-519692 (Patent Document 2), JP2009-523581 (Patent Document 3), JP2008-514383 (Patent Document 4), WO2008 / 081653 (Patent Document 5), the technique of providing a lens structure to cancel the lens effect in the sheath deflecting optical system is disclosed.

The present invention is easy to manufacture, and its object is to provide an optical probe that allows obtaining a high-resolution tomographic image.

To solve the problem, it has a proximal end connected to the measurement section of the OCT device, and a distal end for illuminating the observation light, an optical fiber, and the focusing optical system, a deflecting optical system, and the sheath the optical probe of the present invention comprising a compensator is provided. In the optical probe of the present invention, the optical fiber transmits the observation light between the proximal and distal ends. Converging optical system is an optical fiber optically connected at the distal end, the observation light emitted from the optical fiber for focusing. Deflection optical system, the distal end being condensing optical system optically connected with, for deflecting the observation light emitted from the optical fiber. The sheath extends along the first direction, and the optical fiber, and the focusing optical system, housed along the deflection optical system in a first direction, the curved portion having a curvature in cross section orthogonal to the first direction a, an observation light deflected by the deflecting optical system, toward a second direction intersecting the first direction, and emits the observation light from the distal end by passing through through the curved portion. Compensation unit is accommodated in the sheath extends along the first direction over a range including a part and a condensing optical system and the deflecting optical system of the optical fiber occurs when the observation light is transmitted through the curved portion to compensate for the optical aberrations.

In the optical probe of the present invention, compensator, by covering the outer periphery of the part and the focusing optical system and the deflecting optical system of the optical fibers, it has been integrally formed with the deflecting optical system and the optical fiber and the focusing optical system it may be. In this case, the compensating part, by covering the outer periphery of the glass fiber and the focusing optical system and the deflecting optical system that coating exposed by removing of the optical fiber, together with the deflecting optical system and the optical fiber and the focusing optical system it may be configured. Further, the converging optical system is a larger diameter than glass fibers, a smaller diameter Grin lens from the coating unit, the outer diameter of the compensator, the outer periphery and the outer periphery of the converging optical system of glass fiber, suitable to equal it is. Further, when the integrated optical fiber and the focusing optical system and the deflecting optical system from the deflection optical system side as viewed along the first direction, the outer edge of the compensator is positioned inside of the outer edge of the cover portion it is preferred that.

In any of the above forms is also the refractive index of the compensator is larger than the refractive index of the medium filling the space between the compensating unit and the sheath, the curvature of the portion observation light in the compensation unit is transmitted, the observation light in the compensation unit is transmitted it is preferred that less than the curvature of the portion other than the portion to be. In this case, the compensation unit includes a first mold portion including a portion observation light extending in the first direction is transmitted, opposite the portion where observation light extending in the first direction is transmitted, the observation light and a second mold portion that does not include a portion for transmitting the second mold part and the first mold portion is perpendicular to the plane of said first direction and the second direction is stretched, parallel to the first direction compensator of being adjacent across the largest boundary surfaces is a cross-sectional, in a cross section orthogonal to the first direction, there may be an optical fiber centered in the second mold portion side of the boundary surface. In addition, there may be a step on the outer surface of the boundary portion between the first mold part and the second mold portion.

Further, in any configuration described above also, the compensation unit is a part in the first direction, it may be provided with a protrusion protruding toward the sheath from the outer circumference of the compensator.

Another aspect of the present invention, a method of manufacturing an optical probe of the present invention is provided. This manufacturing method includes a first mold for forming a first mold portion including a portion Mashimashi by observation light is transmitted extending in the first direction of the compensator faces adjacent to the first mold portion, observed by combining the second mold for forming the second molded part that does not include the portion where light is transmitted to confirm the space part and the focusing optical system and the deflecting optical system of the optical fiber arranged inside this space, comprising the steps of curing a resin is filled in the internal space.

In the method for manufacturing an optical probe of the present invention, in a cross section orthogonal to the first direction, so that the second mold side of the boundary surface between the first mold part and the second mold section there is an optical fiber center, the first mold When, it may be divided second mold.

According to the present invention, it is easy to manufacture, can provide an optical probe that allows obtaining a high-resolution tomographic image.

Figure 1 is a conceptual diagram of the OCT apparatus including an optical probe according to an embodiment of the present invention.

(A) area in FIG. 2 is a YZ cross-sectional view of the distal end of the optical probe of Figure 1. (B) regions of Figure 2, glass fiber, covering portion at the distal end of the optical probe of Figure 1, and the mold part is a front view seen from the Z direction Grin lenses.

Figure 3 is a perspective view showing a YZ cross-section of the distal end of the optical probe of Figure 1.

Figure 4 is a conceptual diagram illustrating the operation of the optical probe of Figure 1.

Figure 5 is a YZ cross-sectional view and a XY cross-sectional view illustrating the optical path of the observation light according to a comparative example.

Figure 6 is a YZ cross-sectional view and a XY cross-sectional view illustrating the optical path of the observation light in accordance with an embodiment of the present invention.

Figure 7 is a XZ cross-sectional view of an optical probe according to a modification of the embodiment of the present invention.

Figure 8 is a diagram for explaining a method for manufacturing an optical probe according to an embodiment of the present invention, the arranged optical fiber and Grin lens in the mold is a front view seen from the optical fiber distal end side.

Figure 9 is a diagram for explaining a method for manufacturing an optical probe according to another embodiment of the present invention, the arranged optical fiber and Grin lens into the mold, it is a front view as viewed from the optical fiber distal end .

Figure 10 is a diagram for explaining a method for manufacturing an optical probe according to a modification of the embodiment of the present invention, the arranged optical fiber and Grin lens into the mold, a front view seen from the optical fiber tip end is there.

Specific examples of the optical probe according to an embodiment of the present invention will be described with reference to the accompanying drawings. The present invention is not limited to these examples, indicated by the appended claims, and is intended to include any modifications within the meaning and range of equivalency of the claims. In the following description, the same reference numerals are given to the same elements in the description of the drawings, without redundant description.

Figure 1 is a conceptual diagram of the OCT apparatus 1 provided with the optical probe 10 according to the embodiment of the present invention. OCT apparatus 1 comprises an optical probe 10 the measurement unit 30, for obtaining an optical interference tomographic image of the object 3. The optical probe 10 includes a proximal end 10a and distal end 10b, includes a handpiece 16 in between. Optical fiber 11 extends toward the distal end 10b from the proximal end 10a, is inserted into the through-hole 16A of the handpiece 16. The optical probe 10 is inserted into a living body to be observed the distal end 10b grips the handpiece 16, it is possible to place the tip of the distal end 10b near the examination site.

Measuring unit 30 includes a light source 31, a branching unit 32, a detection unit 33, a terminal 34, a reflecting mirror 35, an analysis unit 36, the output port 37. Light emitted from the light source 31 is branched into a reference beam and the observation beam in the branch portion 32. Observation light is output to the proximal end 10a of the optical probe 10 is irradiated propagated through the optical fiber 11 from the distal end 10b to the object 3.

Back-reflected light generated according to the irradiation of the observation light to the object 3 is incident on the optical fiber 11 again from the distal end 10b, is input from the proximal end 10a to the branch portion 32. The reference beam is emitted from the terminal 34 to the reflecting mirror 35, and incident again to the terminal 34, is input to the branching unit 32. Reference light and observation light incident on the branch portion 32 interferes by being coupled at the branch portion 32, the interference light is detected by the detector 33. It is the spectrum of the interference light and the analysis portion 36 analyzes the distribution of the back reflection efficiency at each point of the internal cross-section of the object 3 is calculated. Based on the calculation result, calculates the tomographic image of the object 3, the image signal is output from the output port 37.

As the mechanism by which the observation light returns to the distal end 10b through the object 3, strictly speaking there is a reflection or refraction or scattering. However, because their differences are not essential for the present invention, it referred to as back reflection they are collectively herein for brevity.

Optical fiber 11 is provided with an optical connector 12 to the proximal end 10a side, and is optically connected to the measurement unit 30 via the optical connector 12. OCT apparatus 1 rotates the optical fiber 11 by rotating the optical connector 12, by scanning the observation light in the circumferential direction, for obtaining an optical interference tomographic image of a predetermined range of the object 3.

The optical probe 10 is provided in the proximal end 10a side of the hand piece 16, a support tube 14 which covers the outer periphery of the optical fiber 11, the jacket tube 15 covering the outer periphery of the support tube 14. Optical fiber 11 and the support tube 14 is fixed with respect to the optical connector 12, and is rotatable relative to the jacket tube 15.

Support tube 14 is a hollow member made of metal, it may be a thin pipe member having a tubular, or may be constructed in a tubular to adjust the flexibility by twisting fibrous metal. Support tube 14 is an inner diameter of for example 0.4 ~ 0.6 mm, it is possible through the coated single mode optical fiber of outer diameter 0.25mm therein. Further, in order to transmit the rotational torque of the optical connector 12 to efficiently distal end 10b, it is preferable that the thickness of the support tube 14 is about 0.3 mm ~ 0.7 mm. Therefore, the outer diameter of the support tube is about 1 ~ 2 mm.

The handpiece 16 has a through hole 16A for inserting the optical fiber 11, the through hole 16A has a first portion 16a in order toward a distal end side 10b from the proximal end 10a side, and a second portion 16b, a third and portion 16c, a fourth portion 16d. The first portion 16a is a portion for fixing the jacket tube 15. The second portion 16b is rotatably accommodate the optical fiber 11 and the support tube 14. The third portion 16c is rotatably accommodating the optical fiber 11. Together with the fourth portion 16d is fixed to the distal end 10b (the metal tube 17 and sheath 18 to be described later), rotatably housing the optical fiber 11.

(A) area in FIG. 2 is a YZ sectional view of the distal end 10b of the optical probe 10. Figure 3 is a perspective view showing a YZ cross-section of the distal end 10b of the optical probe 10. (A) region, shown in FIG. 2 (b) regions of Figure 2, in the figure 3, XYZ orthogonal coordinate system is set such and Z directions in which the optical fiber extends coincide is shown.

As shown in (a) region of FIG. 2, the distal end 10b to the optical fiber 11, the optical fiber 11 and the Grin lens 13 optically coupled, metal tube 17 which covers the optical fiber 11 and the Grin lens 13 and comprises a resin sheath 18 covering the metal tube 17. Optical fiber 11 and the Grin lens 13 is integrated by the molded portion 19. Mold portion 19, the lower surface of the observation light L is emitted, including a compensation unit 19b. It will be described later configuration and operation of compensator 19b.

The sheath 18 to seal the interior space SP airtight. It internal space SP may be a space, the fluid may be filled. The outer diameter d1 of the sheath 18 is a 1mm or less, it is preferred to be smaller than the outer diameter of the support tube 14. Metal tube 17 has a slit SL formed by cutting from the end portion in the Z direction.

Optical fiber 11 is a single-mode optical fiber, covered with a glass fiber 11a made of a high refractive index of the core for propagating light (not shown) and a low refractive index surrounding the core cladding (not shown), the glass fiber 11a comprising a coating 11b. Optical fiber 11, the coating 11b at the end of the distal end 10b side is exposed glass fibers 11a is removed by a predetermined length, Grin lens 13 is fusion spliced ​​to the leading end. Glass fibers 11a and Grin lens 13 is surrounded by the mold part 19, the optical fiber 11, Grin lens 13 and the mold portion 19 is formed integrally.

Diameter at perpendicular XY section to the optical axis of the glass fiber 11a and Grin lens 13 may be equal, (1.02 to 1.10 times the diameter of the glass fiber 11a) slightly larger diameter Grin lens to Oite also good. By providing a difference in diameter, it is possible to easily recognize the boundary of the Grin lens 13 and the glass fiber 11a, can easily manage the length of the Grin lens 13.

Mold section 19, after fusing the glass fiber 11a and Grin lens 13, the optical fiber 11 is placed in a mold filled with the resin is formed by curing. In the outer peripheral portion and the outer peripheral portion of the Grin lens 13 of the outer diameter of the mold portion 19 is glass fiber 11a, together preferably equal. Thus, the difference in the outer diameter of the glass fiber 11a and Grin lens 13 is configured to be absorbed in the molding portion 19. Thus, the optical fiber 11 which is formed integrally, Grin lens 13, and the structure of the mold portion 19, a good symmetry structure in the Z direction as an axis. Thus, when rotation is added to axis Z direction in the optical fiber can be efficiently transmitted rotational torque to the distal end 10b. Incidentally, the mold section 19 may be composed of a resin which transmits the observation light L, the interior of the material has been a pipe-like configuration with member which transmits the observation light L such as glass capillaries, glass fiber 11a and Grin lens 13 may be formed by adhesively fixed by inserting a.

For inside the metal tube 17 to rotate the optical fiber 11 efficiently, the outer diameter d2 of the mold portion 19, which is preferably below the diameter of the coating portion 11b. When the optical fiber is a single mode optical fiber, the diameter of the glass fiber 11a is approximately 0.125mm, the diameter of the coating portion 11b is about 0.25 mm, an outer diameter d2 of the mold portion 19 is 0.125mm it is about ~ 0.25mm. In this case, it is preferable inner diameter d3 of the metal tube 17 is about 0.3 ~ 0.5 mm. Further, it is preferable that the mold portion 19 which is composed of resin having a low friction coefficient such as fluorine resin.

(B) area of ​​FIG. 2, the glass fiber 11a at the distal end of the optical probe 10, the coating 11b, a front view seen from the Z direction of the mold portion 19, Grin lens 13. Grin lens is a condensing optical system and the deflecting optical system has a shape that fits within the cross section of the coating. Compensator 19a is a mold section 19 partially has a shape that fits within the cross section of the coating. Thus, the optical fiber 11 for rotation within distal end 10b, the mold portion 19, Grin lens 13 has a tapered shape as a whole. Therefore, when the rotational torque is transmitted to the distal end 10b through the optical fiber 11, distal optical fiber 11 can be prevented from violent off the Z-axis is a rotation axis within the sheath 18, efficiently it is possible to transmit rotational torque to the deflecting optical system.

Figure 4 is a conceptual diagram illustrating the operation of the optical probe 10. At the distal end 10b, the end face of the Grin lens 13 includes a reflective surface 13a inclined at an angle θ with respect to the Z axis. The refractive index difference between the refractive index and the inner space SP of the Grin lens 13, thereby deflecting the light totally reflected by. Therefore, Grin lens 13 has a function as a deflection optical system of the present invention.

Grin lens 13 also has a function as a condensing optical system of the present invention, and emits the converged light emitted from the core of the optical fiber 11. Grin lens 13 has a distance r is long as the refractive index n becomes gradually smaller refractive index distribution of the optical axis extending in the Z direction, the refractive index n is expressed by a quadratic function of the distance r. Refractive index of the Grin lens is rotationally symmetric about the center axis. This is propagated in the fundamental mode of the optical fiber 11, the light emitted is emitted from the core at the end face, it is converging while substantially parallel to the propagation and Z-direction within the deflection by the reflecting surface 13a in the middle of the converging doing, it is possible to condense in the vicinity of a point on the outside.

In the present embodiment uses a Grin lens 13 also functions as a deflection optical system focusing optical system may be both functions is separated into different members. That, Grin lens 13 and that has an end surface perpendicular to the Z-axis so as not to have a reflective surface 13a, and to have only the function as a condensing optical system. Then, a member having a function as the deflecting optical system such as a prism having a reflecting surface 13a on the end face may be fixed.

Metal tube 17 has a slit SL formed by cutting from the end portion in the Z direction. Sheath 18 and the mold unit 19 is composed of a material that transmits the observation light L propagated through the optical fiber 11. Thus, the observation light L propagated through the optical fiber 11 is deflected in the Y direction by the reflecting surface 13a while condensed by Grin lens 13, through the inner space SP, the slit SL, sheath 18, distal end enters the object 3 existing on the side of 10b. Angle θ of the reflection surface 13a makes with the center axis is set to less than 20 ° or 45 °, it is preferable that the observation light L to be emitted in slightly inclined in the Z direction with respect to the Y direction.

The optical probe 10, by rotating the optical connector 12 can be axially rotating the optical fiber 11 and the support tube 14 in the jacket tube 15 within. The rotational torque of the support tube 14 and the optical fiber 11 via the optical fiber 11 held in the through hole of the handpiece 16, is transmitted to the optical fiber 11 in the distal end 10b. Thus, by rotating the optical connector 12, in the metal tube 17 and sheath 18 of the distal end 10b, and the optical fiber 11 and the Grin lens 13 can rotate the Z-axis as a rotation axis.

Further, the optical probe 10 in the metal tube 17 having a slit SL, the optical fiber 11 can be axially rotated. Thus, when the external force is transmitted to the sheath 18 through the handpiece 16, the distal end sheath 18 is deformed can be suitably prevented from behave like violent outward from the rotational axis. Furthermore, the observation light scanned to the object on the side of the optical probe 10 is limited to the opening range R in the around the Z axis of the slit SL. This can prevent the observation light L other than the region to be observed of the object 3 is irradiated, it is possible to prevent the damage applied to the unexpected sites.

Figure 5 is a YZ sectional view and XY cross-sectional view illustrating the optical path of the observation light L according to the comparative example, FIG. 6 is a YZ cross-sectional view and a XY cross-sectional view illustrating the optical path of the observation light L in this embodiment. In the present embodiment, in that the mold unit 19 includes a compensation unit 19b, differs from the comparative example. Other configurations are the same, the refractive index of the Grin lens 13 is about 1.45, the refractive index of the mold portion 19 is about 1.45, the refractive index of the internal space SP is about 1.00, refractive index of the sheath 18 is about 1.64, an external refractive index of the optical probe 10 is approximately 1.30. The inclination angle of the reflecting surface 13a is, for example, 35 °.

As shown in YZ cross-sectional view of FIGS. 5 and 6, the observation light L is converged expanding the beam diameter in the process of propagating the Grin lens 13, by the reflective surface 13a in a direction that is slightly inclined in the Z direction from the Y-direction It is deflected. Further, the internal space SP, the slit SL, via the sheath 18, is emitted to the side of the distal end 10b. Since the refractive index of the Grin lens 13 and mold part 19 are substantially equal, the observation light L at the interface therebetween is hardly refracted. On the other hand, the interface between the larger is the interface mold portion 19 and the inner space SP of the refractive index difference, and the interface between the inner space SP and the sheath 18, while being refracted at the interface between the outer sheath 18 and the optical probe 10, a Y-direction It is emitted in a direction which is slightly inclined in the Z direction.

Optical fiber 11, Grin lens has a cylindrical shape, the mold portion 19, the sheath 18 is cylindrical. In particular, the sheath 18 extends along the Z direction, has a curved portion 18a having a curvature in XY cross section (cross section perpendicular to the first direction). Observation light L deflected by the reflecting surface 13a is emitted from the side of the distal end 10b by passing through the curved portion 18a. Accordingly, in the YZ cross-section, the interface between the mold portions 19 and the inner space SP, and the interface between the inner space SP and the sheath 18, the interface between the outer sheath 18 and the optical probe 10 has no curvature. On the other hand, in the XY cross-section, the interface of the mold portion 19 and the inner space SP, and the interface interior space SP and the sheath 18 (the curved portion 18a), the interface of the sheath 18 (the curved surface portion 18a) and the outside of the optical probe 10 having a curvature. Therefore, there is a fact that the focal length dy in the Y direction, and a focal length dx in the X direction differs.

Observation light L in the comparative example, in the XY plane, is condensed in an arc-shaped cross section of the interface of the mold portion 19 and the inner space SP, it is diverged by an arc-shaped cross section of the interface of the internal space SP and the sheath 18, the sheath 18 It is condensed with an arc-shaped cross section of the interface with an external optical probe 10. At this time, since collection angle in the XY plane is larger than the collection angle in the YZ plane, becomes a dy> dx, beam shape of the observation light L at the focal position in the Y direction, the long axis in the Z-direction an elliptical with. The observation light L by passing through a path having an asymmetric power to the resulting optical aberration, which causes the resolution of a tomographic image by the OCT measuring is reduced.

In the present embodiment, the mold portion 19 includes a compensation unit 19b. Compensator 19b is a portion including a portion observation light L is transmitted out of the mold portion 19, the curvature of the compensation portion 19b is smaller than the curvature of the portion other than the compensation portion 19b. In this case, the observation light L, in the XY plane, are loosely focused at the interface of the compensation portion 19b and the inner space SP, it is diverged by an arc-shaped cross section of the interface of the internal space SP and the sheath 18, the sheath 18 and the optical probe It is condensed with an arc-shaped cross section of the interface between the 10 external. Thus, the focal position of the observation light L such that dy = dx is adjusted by reducing the curvature of the compensator 19b, optical aberrations are compensated occurring when passing through the curved portion 18a of the sheath 18 . Therefore, the observation light L having high roundness can be obtained in the XY focal position. The shape of the compensation portion 19b is not limited to a spherical lens shape, it may be adopted aspherical lens shape. It may also include a portion having a plurality of different curvatures in the compensator 19b.

Further, as shown in (a) region of FIG. 2, the compensation portion 19b extends along the Z-direction over a range which includes a glass fiber 11a and Grin lens 13 exposed from the optical fiber 11. In the technique described in Patent Documents 1-5, since providing a lens structure deflecting optical system, in addition to costly machining of the deflecting optical system, although the alignment of the optical fiber has a problem that it is difficult, thus by configuring the compensating section as a structure provided over a wide range, for example, such as resin molding or bonding of the glass capillary, it is possible to form a compensator 19b in the mold part 19 by easy processing methods.

Particularly in this embodiment, the mold portion 19 including the compensation portion 19b is by covering the outer periphery of the glass fiber 11a and Grin lens 13 constitute together the optical fiber 11 and the Grin lens 13. This makes it possible to position with high accuracy compensation portion 19b relative to the optical fiber 11 and Grin lens 13. Further, the mold portion 19 by covering only the glass fiber 11a, can be prevented large diameter of the mold section 19, it is possible to prevent increase in the diameter of the thus sheath 18. Further, for example, when configuring the mold portion 19 in the glass capillary, it is possible to reduce the clearance between the glass capillary and the optical fiber 11 and Grin lens. This makes it easy to arrange in a line optical fiber 11 and Grin lens along the Z-axis.
(Modification)

Figure 7 is a XY cross-sectional view of the distal end 10b of the optical probe according to a modification of the present embodiment. In this modification differs from the embodiment described above in that the mold unit 19 is provided with a convex portion 19a. Some protrusion 19a is along the Z-direction of the mold portion 19 is provided so as to protrude toward the outer periphery to the sheath 18. Protrusions 19a, when providing the mold section 19 on the outer periphery of the optical fiber 11 and the Grin lens 13 is preferably formed integrally with the same resin as the mold section 19.

It can be disposed an optical fiber 11 to the center position of the sheath 18 by the convex portion 19a. That is, when the rotation of the rotation axis Z-axis to the optical fiber 11 is applied, as the optical fiber 11 is violently within sheath 18, the inner periphery (inner periphery of the metal tube 17 of the convex portion 19a is sheath 18 it is possible to restrict the movement of the optical fiber 11 abuts on). Therefore, it is possible to efficiently transmit rotational torque to the deflecting optical system.

Preferably provided plural in the convex portion 19a is in the cross-section perpendicular to the axis of the mold portion 19, four at 90 ° intervals, for example, circumferentially, or are three provided at 120 ° intervals. Further, it is preferable to provide a plurality along the Z direction. In this case, by equal the height of the convex portion 19a, it can be easily disposed of optical fiber 11 and Grin lens 13 to the center position of the cylindrical sheath 18. Height of the convex portion 19a is higher than the top portion is covered 11b, and is preferably set to have a slight clearance between the inner diameter of the mold the metal tube 17.

Figure 8 is a diagram illustrating an example of a method for manufacturing an optical probe according to the present invention, the arranged optical fiber and Grin lens in the mold, the first direction from the optical fiber 11 the distal end (Grin lens 13) side it is a front view taken along the (Z direction). Molded portion 19 covering a part of the optical fiber or collecting optical system, the deflection optical system includes a first mold portion 19c which includes a portion (compensator 19b) which observation light extending in the first direction is transmitted, the extend in one direction opposite to the compensation unit 19b, and a second mold portion 19d without the compensation unit 19b.

A first mold (lower mold) 20a for forming the first molded portion 19c, the second mold space defined by combining (upper mold) 20b for forming the second molded part 19d, the optical fiber 11 some a Grin lens 13 disposed to cure a resin is filled in the space inside the surrounding. Thereafter, by removing from the mold, which compensator to cover integrally around a portion of the optical fiber 11 and the Grin lens 13 is formed is obtained. Although it preferred that ultraviolet curing type as the resin is not limited thereto. The method for manufacturing an optical probe according to the present embodiment, without discontinuities is formed on the compensator, it is possible to obtain an optical probe that can be accurately measured observation light.

Upon removal from the mold after the resin is cured, in order to do this easily, it is necessary to keep the peripheral portion of the mold opening in flared. If as an optical probe according to the present invention is limited to the outermost diameter, correspondingly, inevitably reduce the size of the compensation unit 19b.

By varying the position that separates this case two types, it is possible to further increase the size of the compensation unit 19b. As shown in FIG. 9, line segment connecting the boundary portion between the first mold portion 19c and the second mold portion 19d in a cross section orthogonal to the first direction (Z direction), the optical fiber 11 in the cross section (Grin lens 13) from the position corresponding to the center, so as to pass through the side close to the first mold portion 19c including a compensation unit 19b, by setting the division surface 19e of the first mold 20a and the second mold 20b, it is possible to shorten the tapered portion of the first mold portion 19c side than the second mold portion 19d side. (In this case, the optical fiber center, in a cross section orthogonal to the first direction, the first mold portion is in the second mold portion side of the boundary surface between the second mold portion.) As a result, the compensation portion 19b the size (corresponding to the width of FIG. 9 X direction) can be further increased.

Note in the above example, in FIG. 9, the optical fiber 11 (Grin lens 13) the first mold 20a so as to be symmetrical to the center position relative to the axis parallel to the street Y axis and the second mold 20b Although setting the dividing plane 19e, is not limited to this, splitting surface may need even across the compensator 19b. The second mold portion 19d mold for forming without the compensation portion 19b need not be formed by one type may be further divided two or more.

Further modification will be described. Figure 10 is a front view of another optical probe as seen along the first direction (Z direction). The difference between the example of Figure 9, the outer surface of the compensator is that the step 19f is formed in the boundary portion of the first mold portion 19c and the second mold portion 19d. This step is extending along the first direction (Z direction). Relative compensation unit 19b, the optical fiber 11 the distal end slanted surface (e.g. 13a portion of FIG. 6) of the (Grin lens 13) is required a high angular accuracy, therefore, the measurement of whether the desired angle is obtained (inspection) itself is required to carry out with high precision. To measure with high accuracy, it is important easily detected by the reference plane and a reference line serving as a mark when observed from the outside. By the boundary portion of the first mold portion 19c and the second mold portion 19d on the outer surface there is a step 19f, the measurement can be easily used as a reference line when the (inspection), the measurement (inspection) accuracy thence it can be increased.

Preferably, such a step is a one-sided 5 [mu] m ~ 30 [mu] m. It is too large consequently would be the thickness of the second mold portion 19d is too thin, because it is difficult to recognize as too small reference position.

Claims (11)

  1. A proximal end connected to the measurement section of the OCT apparatus, an optical probe comprising a distal end for illuminating the observation light, and
    An optical fiber for transmitting the observation light between said distal end and said proximal end,
    Are connected the optical fiber and optically at the distal end, and a condensing optical system for condensing the observation light emitted from the optical fiber,
    It said being connected the light converging optical system and optically at the distal end, and a deflecting optical system for deflecting the observation light emitted from the optical fiber,
    Extending along a first direction, and the optical fiber, and the light converging optical system, and said deflecting optical system a sheath for housing along the first direction, the cross section perpendicular to the first direction in having a curved portion having a curvature, the observation beam deflected by the deflecting optical system, toward a second direction crossing the first direction, said distal by transmitting through the curved portion a sheath which emits the observation light from the end,
    Accommodated in the sheath, over a range including a part and said condensing optical system the deflection optical system of the optical fiber extending along the first direction, the observation light passes through the curved portion a compensation unit for compensating for optical aberrations caused when,
    Optical probe with a.
  2. The compensator, by a portion of the optical fiber and the focusing optical system to cover an outer periphery of the deflecting optical system is configured integrally with the deflection optical system and the optical fiber and the focusing optical system ,
    The optical probe according to claim 1.
  3. The optical fiber within the sheath includes a cover portion, a glass fiber coating is exposed is removed,
    The compensation unit is configured by a glass fiber and the focusing optical system to cover an outer periphery of the deflecting optical system is configured to said deflection optical system and integral with said optical fiber and the light converging optical system,
    The optical probe according to claim 2.
  4. The light converging optical system is a larger diameter than the glass fiber, has a smaller diameter of the Grin lens from said coating unit,
    The outer diameter of the compensator, the outer periphery and the outer periphery of the light converging optical system of the glass fiber, equal to each other,
    The optical probe according to claim 3.
  5. When integrated with said optical fiber and the light converging optical system the deflection optical system from the deflection optical system side as viewed in the first direction,
    Outer edge of the compensator is positioned inside of the outer edge of the cover portion,
    The optical probe according to claim 3 or 4.
  6. Refractive index of the compensator is larger than the refractive index of the medium filling the space between the said compensator sheath, the curvature of the portion where the observation light in the compensation unit is transmitted, the
    Smaller than the curvature of the portion other than the portion where the observation light in the compensation unit is transmitted,
    The optical probe according to any one of claims 1 to 5.
  7. The compensation unit is opposed to the the first mold portion including a portion in which the observation light extending in the first direction is transmitted, the portion in which the observation light extending in the first direction is transmitted, the with the observation light and a second mold portion that does not include a portion that transmits,
    Said second mold part and the first mold portion, perpendicular to the plane of the first direction and the second direction is stretched, across the interface is the largest cross-section of said parallel compensator in the first direction in are adjacent,
    Wherein the first cross-section perpendicular to the direction, there is the optical fiber center to the second mold portion side of the boundary surface, the optical probe of claim 6.
  8. There is a step on the outer surface of the boundary portion between the first mold part and the second mold part,
    The optical probe according to claim 7.
  9. The compensation unit, said part along a first direction, and a protrusion protruding toward the sheath from the outer periphery of the compensator, the optical probe according to any one of claims 1-8.
  10. A method for manufacturing an optical probe according to claim 1,
    A first mold for forming a first mold portion including the portion where the observation light extending in the first direction is transmitted among the compensator faces adjacent to the first mold portion, the observation by combining the second mold for forming the second molded part that does not include a portion through which light passes to define a space,
    The arranged portion and said condensing optical system the deflection optical system of the space inside the optical fiber,
    The method of manufacturing an optical probe which is cured filling the resin within said space.
  11. In the cross section perpendicular to the first direction, so that there is the optical fiber centered in the second mold side of the boundary surface between the first mold part and the second mold portion, said first die, said first to split the second mold,
    The method of manufacturing an optical probe according to claim 10.
PCT/JP2016/061648 2015-04-16 2016-04-11 Optical probe WO2016167204A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2015-083897 2015-04-16
JP2015083897 2015-04-16
JP2015155591A JP2016202866A (en) 2015-04-16 2015-08-06 The optical probe
JP2015-155591 2015-08-06

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/566,148 US20180087893A1 (en) 2015-04-16 2016-04-11 Optical probe
EP16779995.6A EP3284387A4 (en) 2015-04-16 2016-04-11 Optical probe

Publications (1)

Publication Number Publication Date
WO2016167204A1 true WO2016167204A1 (en) 2016-10-20

Family

ID=57126583

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/061648 WO2016167204A1 (en) 2015-04-16 2016-04-11 Optical probe

Country Status (1)

Country Link
WO (1) WO2016167204A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000262461A (en) * 1999-02-04 2000-09-26 Olympus Optical Co Ltd Optical imaging device
JP2008067889A (en) * 2006-09-14 2008-03-27 Pentax Corp Optical coherence tomography probe for linear-scanning endoscope
JP2009510451A (en) * 2005-09-29 2009-03-12 ザ ジェネラル ホスピタル コーポレイション Optical imaging method and apparatus according to spectrum coding
JP2012229976A (en) * 2011-04-26 2012-11-22 Hoya Corp Optical scanning probe
JP2013202295A (en) * 2012-03-29 2013-10-07 Sumitomo Electric Ind Ltd Optical probe
US20130266259A1 (en) * 2012-03-28 2013-10-10 Corning Incorporated Monolithic beam-shaping optical systems and methods for an oct probe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000262461A (en) * 1999-02-04 2000-09-26 Olympus Optical Co Ltd Optical imaging device
JP2009510451A (en) * 2005-09-29 2009-03-12 ザ ジェネラル ホスピタル コーポレイション Optical imaging method and apparatus according to spectrum coding
JP2008067889A (en) * 2006-09-14 2008-03-27 Pentax Corp Optical coherence tomography probe for linear-scanning endoscope
JP2012229976A (en) * 2011-04-26 2012-11-22 Hoya Corp Optical scanning probe
US20130266259A1 (en) * 2012-03-28 2013-10-10 Corning Incorporated Monolithic beam-shaping optical systems and methods for an oct probe
JP2013202295A (en) * 2012-03-29 2013-10-07 Sumitomo Electric Ind Ltd Optical probe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3284387A4 *

Similar Documents

Publication Publication Date Title
EP2290318B1 (en) Apparatus for OCT imaging with axial line focus for improved resolution and depth of field
US4215937A (en) Method and apparatus for detecting optimum alignment of optical fibers in a connector arrangement
US5878178A (en) Optical fiber with enhanced light collection and illumination and having highly controlled emission and acceptance patterns
JP4932993B2 (en) Single-mode optical fiber coupling system
JP4997112B2 (en) Device and manufacturing method thereof in order to transmit at least one electromagnetic radiation
Bland-Hawthorn et al. Hexabundles: imaging fiber arrays for low-light astronomical applications
US4705351A (en) Two lens optical package and method of making same
US5093719A (en) Endoscopic gradient index optical systems
CA1219479A (en) Optical system
US6144449A (en) Low coherence interferometric device
JP2009178229A (en) Oct probe
US9791317B2 (en) Spectrally-encoded endoscopy techniques and methods
CN1795405A (en) Double-clad fiber scanning microscope
WO2008072369A1 (en) Measurement device and measurement method
JPH09105611A (en) Automatic noncontact eccentricity measuring equipment at central feature part of object
CN1997871B (en) Device and method for inspecting the internal surfaces of holes
JP2011008014A (en) Optical fiber connection structure and endoscope system
KR20040032816A (en) Catoptric and catadioptric imaging systems
US7791794B2 (en) Surgical microscope having an OCT-system
US8403836B2 (en) Light guide, light source apparatus and endoscope system
US20070211999A1 (en) Optical Connector
JP2004126586A (en) Symmetric bi-aspheric lens for use in optical fiber collimator assembly
AU2010351572B2 (en) Miniature optical elements for fiber-optic beam shaping
US7221824B2 (en) Miniaturized focusing optical head in particular for endoscope
FR2526935A1 (en) Method and device for simultaneous measurement of geometric characteristics of an optical fiber

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16779995

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 15566148

Country of ref document: US

NENP Non-entry into the national phase in:

Ref country code: DE