# US 2014/0194862 A1 · Multi-spot laser probe with micro-structured faceted proximal surface

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- Number: US 2014/0194862 A1
- Document ID: US20140194862A1
- Status: Published application
- Kind: A1
- Application number: 13/736,506
- Filed: 2013-01-08
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Alcon Research, Ltd.
- Applicants: Alcon Research, Ltd.
- Inventors: Ronald T. Smith; Mark H. Farley; Dustin J. Bouch
- Web page: https://patentgrep.com/patent/US20140194862A1

## CPC

- A61F 9/00821: {for coagulation}
- A61B 2018/206: {the laser light passing along a liquid-filled conduit}
- A61B 2018/2266: {with a lens, e.g. ball tipped}
- A61B 2018/2272: {with reflective or refractive surfaces for deflecting the beam (A61B2018/2261, A61B2018/2266 take precedence)}
- A61F 2009/00863: {Retina}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An optical surgical probe includes a cannula; a light guide within the cannula, configured to receive a light beam from the light source, to guide the light beam to a distal end of the light guide, and to emit the light beam at the distal end of the light guide; and a multi-spot generator at a distal end of the cannula, the multi-spot generator having a faceted proximal surface with oblique facets, configured to receive the light beam emitted at the distal end of the light guide and to split the received light beam into multiple beam-components, and a distal surface through which the multiple beam-components exit the multi-spot generator, wherein the proximal surface of the multi-spot generator is micro-structured with a modulation length smaller than a wavelength of the light beam in order to reduce the reflectance of light back into the probe.

## Claims

### Claim 1

An optical surgical probe comprising:
a cylindrical cannula;
a light guide within the cannula, configured to receive a light beam from the light source, to guide the light beam to a distal end of the light guide, and to emit the light beam at the distal end of the light guide; and
a multi-spot generator at a distal end of the cannula, the multi-spot generator having
a faceted proximal surface with oblique facets, configured to receive the light beam emitted at the distal end of the light guide and to split the received light beam into multiple beam-components, and
a distal surface through which the multiple beam-components exit the multi-spot generator, wherein
the proximal surface of the multi-spot generator is micro-structured with a modulation length smaller than a wavelength of the light beam.

### Claim 2 (depends on 1)

The probe of claim 1, the proximal surface of the multi-spot generator comprising:
micro-structures, with an average separation less than the wavelength of the light beam.

### Claim 3 (depends on 2)

The probe of claim 2, the micro-structures comprising at least one of:
bumps, cones, prisms, pyramids, grooves, troughs, divots and a relief pattern.

### Claim 4 (depends on 1)

The probe according to claim 1, wherein:
the proximal surface of the multi-spot generator has a moth's eye structure.

### Claim 5 (depends on 1)

The probe according to claim 1, wherein:
the proximal surface of the multi-spot generator is micro-structured to have an effective index of refraction that reduces a reflection of the light beam by the proximal surface of the multi-spot generator to below 1%.

### Claim 6 (depends on 1)

The probe of claim 1, the multi-spot generator comprising:
a cured adhesive medium at a distal end of the cannula, the micro-structured proximal surface being formed at a proximal surface of the adhesive medium; and
a ball lens, disposed in the cured adhesive medium.

### Claim 7 (depends on 6)

The probe of claim 6, the ball lens comprising:
a sapphire ball lens.

### Claim 8 (depends on 1)

The probe of claim 1, the multi-spot generator comprising:
a distal surface, micro-structured with a modulation length smaller than the wavelength of the light beam; and
the proximal surface and the distal surface of the multi-spot generator are micro-structured to have effective indices of refraction that reduce an overall reflection of the light beam by the multi-spot generator to below 1%.

### Claim 9

A method for manufacturing a multi-spot generator for an optical surgical probe, the method comprising:
depositing an optically transmissive adhesive medium on the surface of the substrate with an applicator;
inserting an optical element into the adhesive medium;
placing a pin with an obliquely faceted and micro-structured distal end onto the adhesive medium to form an obliquely faceted micro-structured proximal surface on the adhesive medium, thus forming a pin-adhesive-optical element-substrate assembly;
placing a cannula onto the pin-adhesive-optical element-substrate assembly to house the multi-spot generator within the cannula;
curing the adhesive medium; and
separating the substrate and the pin from the multi-spot generator housed within the cannula.

### Claim 10 (depends on 9)

The method of claim 9, comprising:
micro-structuring the distal end of the pin with electron beam etching.

### Claim 11 (depends on 9)

The method of claim 9, comprising:
micro-structuring the distal end of the pin by indenting the distal end of the pin with a micro-structured and faceted master-tool.

### Claim 12 (depends on 11)

The method of claim 11, wherein:
the master-tool comprises a material harder than a material of the pin; and
the master-tool is micro-structured with electron beam etching.

### Claim 13 (depends on 9)

The method of claim 9, comprising:
micro-structuring the distal surface of the pin by injection molding with a micro-structured and faceted mold-tool.

### Claim 14 (depends on 9)

The method of claim 9, comprising:
depositing a mold release layer on the distal surface of the pin.

### Claim 15 (depends on 9)

The method of claim 9, wherein:
the micro-structured proximal surface has a modulation length shorter than the wavelength of an operating light beam of the optical surgical probe.

### Claim 16 (depends on 15)

The method of claim 15, wherein:
the micro-structured proximal surface comprise at least one of
bumps, cones, prisms, pyramids, grooves, troughs, divots, a relief pattern, and a moth's eye structure.

### Claim 17 (depends on 9)

The method of claim 9, the forming comprising:
forming the obliquely faceted micro-structured proximal surface with a micro-structure to have an effective index of refraction that reduces a reflection of the light beam by the proximal surface to below 1%.

### Claim 18 (depends on 9)

The method of claim 9, wherein:
a positioning of the optical element on the substrate precedes the depositing the adhesive medium on the surface.