CN201085731Y - High-efficiency flying spot scanning laser vision therapeutic instrument - Google Patents

Abstract

The utility model provides a high efficiency flying spot scanning laser vision therapeutic instrument, it includes a light source ware and a scanner, the light source ware is connected with the power to send laser beam be equipped with on the light path behind the light source ware the scanner still is equipped with a lens that gathers that plays the spotlight effect between light source ware and scanner. The utility model provides a high efficiency flying spot scanning laser vision therapeutic instrument, its scanner through receiving two 45 degrees high reflection mirror constitutions of motor drive makes it rotate at X and Y axial respectively, has realized overcoming the low energy, low repetition frequency obstacle to reach the practical application requirement, can be used to the purpose of the laser vision treatment of LASIK. By further arranging a spot device or a position-adjustable focusing lens on the light path between the light source device and the scanner, the high-efficiency corneal surface ablation can be further ensured, and the ablation accuracy can be maintained at the same time. The light source device can also be an independent light source body comprising 2 light-emitting bodies with different relative time.

Description

High-efficiency flying spot scanning laser vision therapy instrument

technical field

The utility model relates to a solid-state laser ophthalmology therapeutic instrument, which is used for treating diseases such as myopia, hyperopia, astigmatism and presbyopia. The methods for treating these diseases are collectively called LASIK. A high-efficiency flying-spot scanning laser vision therapy instrument for this operation.

Background technique

At present, the laser vision therapy instruments used for LASIK on the market all use Excimer Laser (Excimer Laser) which is a toxic gas of argon fluoride (ArF). This equipment has disadvantages in terms of maintenance, safety, use and manufacturing cost. The use of non-excimer solid-state laser systems in LASIK is still lacking due to the lack of breakthroughs in technology and clinical practice. Especially in the two wavelength regions of deep ultraviolet with a wavelength of 200 to 220 nanometers and mid-infrared with a wavelength of 2.7 to 3.0 microns, there is no corresponding laser vision treatment equipment. Furthermore, the spot size of the existing excimer laser cannot be adjusted, so both the excision efficiency and accuracy are limited.

Contents of the invention

The purpose of this utility model is to break through the defects of the prior art, to provide a laser vision therapy device that overcomes the obstacles of low energy and low repetition rate, and can adjust the size of the light spot to meet the practical application requirements of resection efficiency and accuracy. High-efficiency flying spot scanning laser vision therapy instrument.

The purpose of this utility model is achieved in that:

The utility model provides a high-efficiency flying-spot scanning laser vision treatment instrument, which includes a light source device and a scanner. The light source device is connected with a power source to emit laser beams. In the scanner, a condensing lens is provided between the light source device and the scanner.

A light spot adjustment device capable of changing the size of the light beam spot is also provided on the light path between the light source device and the scanner.

The spot adjustment device described in the high-efficiency flying-spot scanning laser vision therapy device may be a spot device for controlling the size of the spot on the surface of the eyeball, which is arranged on the optical path between the light source device and the condenser lens.

The spotter can be an existing spotter that changes the size of the spot in the prior art.

The light spot adjustment device may also be the condenser lens that can move on the optical path to change the size of the light spot passing through it.

Described light source device can be the excimer light source of argon fluoride (ArF), wavelength 193 nanometers; YVO4) solid-state laser; the light source can also be a laser diode laser with an infrared wavelength of 2.7 to 3.0 microns; or a chromium (YAG) or Yasky (YSGG) laser with an output wavelength of 2.7 to 3.0 Micron (micron).

The light source can also use a flashlamp (flashlamp) pump or a laser diode (diode laser) pump.

The light source can also be made of neodymium (Nd) chromous (YAG), fluorine (YLF) or fluorine oxide (YVO4) with Raman-shift generated by Raman tube (Raman Cell). A solid-state laser with an output wavelength of 2.7 to 3.0 microns (micron), and a Raman tube length of 0.2 to 1.5 meters. The high-pressure gas in the tube can be hydrogen (H ₂ ), deuterium (D2) or methane (mathane), and the high pressure ranges from 400 to 900 pounds per square inch (psi).

The light source device itself may be composed of two independent light source bodies, and the relative time of light emission of the two independent light source bodies is different, that is, the relative delay time (T) is between 0.005 and 0.1 seconds, and the scanning speed is 1/T to 3/T (mm/s), and use a scanning speed between 100 mm and 50 mm per second; to achieve the "effective" repetition rate addition effect and improve the cutting efficiency, which cannot be achieved by a single light of. It also includes a light combiner, which contains a pair of 45-degree reflectors, one of which is set on the output light path of an independent light source, so that the light passes through the reflector, and the other reflector is set on another independent On the output light path of the light source device, the light is reflected, and the light reflected by the previous reflector and the transmitted light are combined into a coaxial light path to reach the scanner.

The linear-polarization directions of the two output lights emitted by the two independent light sources are perpendicular to each other.

A spot device may be provided between the light source device and the light combiner, and one spot device is arranged on the optical path of each laser beam.

A spotter can also be arranged on the optical path of the combined light beam between the light combiner and the condenser lens.

A high reflection mirror is set at the back of the scanner at a angle of 45 degrees to the optical path.

The utility model provides a high-efficiency flying-spot scanning laser therapy instrument, which includes a light source device and a scanner, the light source device is connected with a power source to emit laser beams, and the optical path behind the light source device is provided with a In the above-mentioned scanner, a condensing lens is also provided between the light source device and the scanner, and the light source device is a solid-state laser light source device.

The high-efficiency flying-spot scanning laser vision therapy instrument provided by the utility model uses a scanner composed of two 45-degree high-reflection mirrors driven by a motor to rotate in the X and Y axes respectively, so as to overcome low energy, Low repetition rate barriers can be used for the purpose of LASIK laser vision therapy in order to meet the requirements of practical applications. The further setting of the spotter can further ensure high-efficiency corneal surface resection while maintaining the accuracy of resection.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the structural representation of an embodiment of the high-efficiency flying-spot scanning laser vision therapy instrument provided by the utility model;

Fig. 2 is a structural schematic diagram of another embodiment of the high-efficiency flying-spot scanning laser vision therapy instrument provided by the utility model;

Fig. 3 is a schematic structural view of an embodiment of a light source device with two independent light sources provided by the present invention;

Fig. 4 is a structural schematic diagram of an embodiment provided by the present invention with two independent light sources and corresponding two scanners;

Fig. 5 is a structural schematic diagram of an embodiment provided by the present invention with two independent light sources and a scanner.

Detailed ways

Example 1:

As shown in Figure 1, in this high-efficiency flying-spot scanning laser vision therapy instrument, its light source device 11 is connected with the power supply device 10, and the output light 12 is controlled to enter the condenser lens through a spot size controller 13 (abbreviated as the spot device). 14 and output the spot size and energy reaching the treatment area 41 on the surface of the eyeball. The output light 12 passes through the condenser lens and then passes through a scanner 20 and a 45-degree high reflection mirror 40 to transmit the laser energy to the eyeball surface treatment area 41 .

The scanner 20 includes a pair of 45-degree high-reflection mirrors 21 and 22, which are connected with a rotating motor and rotate in the X and Y axes respectively. The scanning mode is controlled by computer software. The spotter 13 can be an existing adjustable pinhole device, such as a camera lens device and the like, and the opening of the circular pinhole is controlled via a mechanical or electronic control element. Its adjustable opening size is 1.0 to 7.0 mm in diameter, so as to achieve focused output light 12 in the eyeball treatment area 41, and the adjustable range of light spot size is 0.3 to 3.0 mm in diameter. The utility model is characterized in that it can ensure high-efficiency corneal surface resection , and can maintain the cutting accuracy at the same time, this function can provide large, medium and small light spots through the spotter 13, and the diameter ranges of the provided light spots are 1.8 to 3.0 mm, 1.3 to 1.7 mm, and 0.5 to 1.2 mm respectively, which are respectively used in large , Medium and small resection areas with diameters ranging from 3.0 to 7.0 mm, 2.1 to 2.9 mm, and 0.3 to 2.0 mm are achieved. It is also possible to use two types of light spots, the diameters of which range from 1.5 to 3.0 mm and 0.5 to 1.4 mm respectively.

The scanning method can be obtained through Lin's formula, as described in the reference (Lin, JT. Customized bifocal lasik profiles for presbyopic eyes, "Customized LASIK", In: Garg A, Lin JT, ed. New Delhi: Jaypee Brothers Medical Publishing..2007). The defined keratectomy function (ablation profile) achieves different vision corrections such as nearsightedness, astigmatism and bifocal. Larger spots have high resection efficiency, but lose their accuracy, especially in the central area of the cornea from 0 to 2.0 mm, and small spots have higher accuracy but lower efficiency due to their arc function. The utility model combines the advantages of the above two and takes the advantages to achieve high efficiency and high accuracy.

The light source device 11 can be chromite (YAG), fluorine (YLF) or fluorine oxygen (YVO4) solid-state laser with neodymium (Nd), ultraviolet wavelength transformed by nonlinear crystal, 0.2 to 0.27 microns (micron) Or the infrared wavelength 2.7 to 3.0 microns converted by optical parametric oscillation. The light source can also be a laser diode with an infrared wavelength of 2.7 to 3.0 microns, or erbium (Er)-chromium (YAG) or Yasky (YSGG), with an output wavelength of 2.7 to 3.0 microns (micron). The light source device 11 can also be a Raman frequency shift (Raman-shift) neodymium (Nd) chromous (YAG), fluorine (YLF) or fluorine oxygen (YVO4) produced by a Raman tube (Raman Cell). The solid-state laser has an output wavelength of 2.7 to 3.0 microns (micron), and the Raman tube is 0.2 to 1.5 meters long. The high-pressure gas in the tube can be hydrogen (H2), deuterium (D2) or methane (mathane), and the high pressure ranges from 400 to 900 pounds per square inch (psi).

The light source device 11 may use a flash lamp (flashlamp) pump or a laser diode (diode laser) pump solid laser. The output light 12 has a pulse width of 0.01 picoseconds to 500 nanoseconds (nanoseconds), a repetition rate of 5 to 10,000 hertz (Hz), and a single pulse energy of 0.01 to 20 millijoules (mJ).

Example 2:

As shown in Figure 2, the condenser lens 14 is used to replace the spotter 13, the position of the condenser lens 14 can be adjusted from distance A to distance B, the focal length range (F) of the condenser lens is 300 to 1500 millimeters, and the distance between A and B is Between 0.5F and 1.2F, the size of the light spot 45 on the surface of the eyeball is correspondingly changed from small to large, and the diameter of the light spot ranges from 0.3 to 3.0 mm.

Example 3:

As shown in Figure 3, the light source device 11 itself is composed of two independent light source bodies 51 and 52, and the relative time requirements for light emission are different, that is, the relative delay time (T) is between 0.005 and 0.1 seconds, and the scanning speed is 1/ Between T and 3/T (mm/s). In order to achieve the "effective" repetition frequency addition effect and improve the cutting efficiency, this cannot be achieved by a single light. The output lights 53 and 54 of the light source bodies 51 and 52 pass through a light combiner 60 , which includes a pair of 45-degree mirrors 61 and 62 , which are combined into a coaxial light path to reach the scanner 20 . To achieve the function of the light combiner 60, the linear polarization directions of the output lights 53 and 54 are required to be perpendicular to each other. The function of this coaxial optical path is to simplify the software design of the scanner 20 .

Example 4:

The spotter 13 as shown in Embodiment 1 can be placed on the path of the combination line 53 or 54 in Embodiment 2, and a spotter 13 is respectively arranged on the optical path of each laser beam; or between the light combiner Between 60 and the condenser lens 14, a spot device is set on the optical path of the combined light beam to control the size of the spot that reaches the eyeball surface position 41. Its structure and principle are as described in Embodiment 1.

Example 5

As shown in Figure 4, the light source device is composed of two independent light source bodies, and the two independent light source bodies are two light source bodies with different relative times of light emission, that is, the relative delay time T is between 0.005 and 0.1 seconds, And use a scanner whose scanning speed is between 1/T to 3/T (millimeters per second); on the output light path of each light source body, one said condenser lens 14 and one said scanner 20 are sequentially arranged.

The output lights 53 and 54 output by two independent light sources are respectively focused by a pair of condenser lenses 14 to two sets of scanners 20, and the two sets of scanners 20 can be independently controlled by software to transmit energy to the surface of the eyeball to achieve clinical Cutting graphics required. The focal lengths of the condensing lenses can be equal or unequal, and the sizes of the light spots that reach the eyeball surface positions equal or unequal are controlled respectively.

Example 6

As shown in Figure 5, this embodiment includes the light source device with two independent light source bodies mentioned in the foregoing embodiment 3, and emits two beams of output light 53, 54. Two light source bodies at the same time, that is, the relative delay time T is between 0.005 and 0.1 seconds, and a scanner with a scanning speed between 1/T and 3/T (mm/s) is used; in two independent light source bodies Two pairs of reflectors 71, 72, 73, 74 are respectively arranged on the output optical paths 53, 54. The positions of the two pairs of reflectors are such that two beams of light rays forming two almost parallel and quite close optical paths are formed. The optical path of the two beams of light falls on the same scanner behind, and then projected onto the same scanner set behind it. The output light 53 and 54 are formed by two pairs of mirrors 71 , 72 , 73 , 74 respectively to form two nearly parallel and relatively close optical paths, and then transmit the laser energy to the eyeball surface through the same scanner 20 .

The above descriptions are specific embodiments of the utility model and the applied technical principles, and are not intended to limit the scope of protection.

Claims (19)

1. high efficiency flying-spot scanner laser visual acuity therapeutic instrument, it is characterized in that: comprise a light source device and one scan device, described light source device is connected with power supply, to send laser beam, on the light path of described light source device back, be provided with described scanning device, between light source device and scanning device, also be provided with poly-lens that play the optically focused effect.

2. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 is characterized in that: also be provided with a hot spot adjusting device that can change the beam and focus size on the light path between described light source device and the scanning device.

3. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 2, it is characterized in that: described hot spot adjusting device is the hot spot device of spot size for a change, and it is 0.3 to 3.0 mm dia that the spot size of this hot spot device adjustment light beam makes it drop on eyeball surface treatment region position adjustable extent.

4. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1, it is characterized in that: described poly-lens are for being arranged on movably between described light source device and the scanning device before and after on the described light path, make the beam and focus size that sees through it change with this, for use in the size of control hot spot.

5. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 4, it is characterized in that: two moving limit positions of these poly-lens are A and B, described poly-focal length of lens F scope is 300 to 1500 millimeters, distance between this A and the B be 0.5F between the 1.2F so that make the spot size that obtains in the corresponding spot diameter excursion of eyeball surface treatment region at 0.3 to 3.0 millimeter.

6. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is to comprise 2 arbitrary source bodies, these two arbitrary source bodies are asynchronous two the light source bodies of bright dipping relative time, be relative delay T between 0.005 to 0.1 second, and use scanning speed at 1/T to the scanning device between the 3/T mm/second; Also comprise a splicer, comprise a pair of 45 degree reflecting mirrors in it, one of them reflecting mirror is located on the output light path of an arbitrary source body, make this reflecting mirror of this light penetration, another reflecting mirror is located on the output light path of another arbitrary source body, make the reflection of this light, and arrive described poly-lens and scanning device through the light that previous mirror reflects and transmitted ray are combined as coaxial light path.

7. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is to comprise that 2 arbitrary source bodies constitute, these two arbitrary source bodies are asynchronous two the light source bodies of bright dipping relative time, be relative delay T between 0.005 to 0.1 second, and use scanning speed at 1/T to the scanning device between the 3/T mm/second; On the output light path of described two arbitrary source bodies, be respectively arranged with two pairs of reflecting mirrors, the position of these two pairs of reflecting mirrors is: make to form two parallel and quite close light paths, this is to make the light path of this two-beam line fall on its same scanning device that is provided with later near degree.

8. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is to comprise that 2 arbitrary source bodies constitute, these two arbitrary source bodies are asynchronous two the light source bodies of bright dipping relative time, be relative delay T between 0.005 to 0.1 second, and use scanning speed at 1/T to the scanning device between the 3/T mm/second; On the output light path of each light source body, be sequentially with described poly-lens and a described scanning device.

9. according to claim 7 or 8 described high efficiency flying-spot scanner laser visual acuity therapeutic instruments, it is characterized in that: the linear polarization direction of the two output light that described two arbitrary source bodies send is vertical mutually.

10. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 6, it is characterized in that: the light path between described light source device and the splicer is provided with a hot spot device that is used to control the size of hot spot, and a described hot spot device is set on the light path of every bundle laser beam.

11. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 6 is characterized in that: between described splicer and the poly-lens, a hot spot device that is used to control the size of hot spot is set on the light path of beam combination.

12. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: argon fluoride excimer laser, wavelength 193 be rice how.

13. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: via the inferior chromium of joining neodymium of nonlinear crystal transformation, the solid state laser of inferior fluorine or inferior fluorine oxygen, ultraviolet wavelength, 0.2 to 0.27 micron.

14. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: by the infrared light supply of optical resonance transformation, and 2.7 to 3.0 microns of wavelength.

15. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: laser diode laser instrument, 2.7 to 3.0 microns of infrared wavelengths.

16. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: the inferior chromium or the YSGG laser instrument of ginseng erbium, output wavelength is 2.7 to 3.0 microns.

17. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: flashing light pump or laser diode solid state laser, this exports light, pulse width be 0.01 batch can be second how second to 500, repetition rate is 5 to 10,000 hertz, single pulse energy is that 0.01 to 20 milli is burnt.

18. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 and 2, it is characterized in that: described light source device is: the inferior chromium of Raman frequency shift ginseng neodymium that uses the Raman pipe to produce, the solid state laser of inferior fluorine or inferior fluorine oxygen, output wavelength is 2.7 to 3.0 microns, and this Raman pipe range is 0.2 to 1.5 meter; Pipe inner high voltage gas is 400 to 900 pounds/square inch of hydrogen, deuterium or methane high pressure ranges.

19. high efficiency flying-spot scanner laser visual acuity therapeutic instrument according to claim 1 is characterized in that: described light source device is a Solid State Laser light source device.

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