A novel fissure opening and closing structure and a slit lamp microscope having the same

Abstract

The present invention provides a slit opening and closing structure of a slit lamp microscope and a slit lamp microscope having the slit opening and closing structure. The slit opening and closing structure includes a guiding mechanism, which includes a crankshaft, a first guide rod, a second guide rod, a bearing, a first connecting rod and a second connecting rod. By replacing the traditional two-axis structure with an integral crankshaft, the slit lamp microscope of the present invention reduces the rotation error between the left scale handwheel and the right scale handwheel, enables convenient and accurate reading of the scale value, and reduces the risk of incorrect reading by the user.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a slit lamp microscope. Background Art

[0002] A slit lamp microscope is one of the most frequently used optical examination devices in ophthalmology and is suitable for examining the anterior segment and internal eye diseases. A slit lamp biomicroscope, abbreviated as a slit lamp, consists of a light source projection system and an optical magnification system and is a commonly used optical instrument in ophthalmology. It illuminates the examination site with a concentrated light source, creating a strong contrast with the dark surrounding area. In cooperation with a binocular microscope magnifier, it can not only clearly observe superficial lesions but also use a thin slit light band to form a series of "optical sections" through the transparent tissues of various parts of the eyeball, clearly showing tiny lesions in different layers of the refractive medium and even deep tissues. Under the magnification of the binocular microscope, the target has a three-dimensional sense, increasing the accuracy of the examination. Therefore, slit lamp examination plays an important role in ophthalmic clinical work.

[0003] The traditional slit lamp microscope has its slit opening and closing structure Figure 1 and 2 completed by the traditional guiding mechanism as shown. A bearing is installed at the upper end of a common eccentric shaft, and a guide rod is arranged above. As the eccentric shaft rotates, the guide rod moves up and down to achieve a certain ejection effect. However, there are several process difficulties and cumulative errors in the traditional guiding, such as the installation of the bearing and the specific positions of the left and right sides of the bearing. Therefore, it has been found during the production process that there are clearance errors between the left shaft of the slit opening and closing handwheel and the right shaft of the slit opening and closing in slit lamp microscopes worldwide, resulting in an error in the slit opening and closing degree not being consistent with the scale number on the slit opening and closing handwheel during use, which easily leads to risks in doctors' data calculations for patients. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a novel slit opening and closing structure for a slit lamp microscope to solve the problem of clearance errors between the left shaft of the slit opening and closing handwheel and the right shaft of the slit opening and closing in the prior art, resulting in an error in the slit opening and closing degree not being consistent with the scale number on the slit opening and closing handwheel during use.

[0005] To achieve the above technical problem, the technical solution adopted by the present invention is as follows:

[0006] A slit opening and closing structure of a slit lamp microscope. The slit opening and closing structure includes a guiding mechanism disposed within the convex machine housing of the slit lamp microscope. It is characterized in that it includes a crankshaft, a first guiding rod, a second guiding rod, bearings, a first connecting rod and a second connecting rod. Wherein a groove is formed in the middle of the bottom of the first guiding rod, and a bearing is disposed therein. The second guiding rod is located above the first guiding rod, and the first guiding rod and the second guiding rod are disposed within the second connecting rod. On the right side of the crankshaft, there are a right scale shaft sleeve, a right scale handwheel locking bushing, a right bushing locking nut, a right handwheel cap and a right scale handwheel. On the left side of the crankshaft, there are installed a left scale shaft sleeve, a left scale handwheel locking bushing, a left bushing locking nut, a left handwheel cap and a left scale handwheel.

[0007] Preferably, a groove is formed in the middle of the bottom of the first guiding rod, and a bearing is disposed therein and connected by a pin.

[0008] Preferably, a groove is formed on the side of the first guiding rod, a set screw is screwed into the second connecting rod, and the crankshaft drives the first guiding rod to move up and down through the bearing, thereby driving the second connecting rod to move up and down.

[0009] Preferably, a sealing sheet is disposed between the right scale shaft sleeve and the right scale handwheel locking bushing.

[0010] Preferably, a sealing sheet is disposed between the left scale shaft sleeve and the left scale handwheel locking bushing.

[0011] Wherein, the right bushing locking nut and the cap disposed on its right side fasten the right scale shaft sleeve and the right scale handwheel locking bushing to the crankshaft.

[0012] Preferably, the handwheels on both the left and right sides have scales.

[0013] A slit lamp microscope, which includes a workbench, a patient head bracket, a slit lamp microscope base, a microscope, a slit lamp and an external transformer. The slit lamp includes the above-mentioned slit opening and closing structure. The slit opening and closing structure includes a guiding mechanism disposed within the convex machine housing of the slit lamp microscope. It is characterized in that it includes a crankshaft, a first guiding rod, a second guiding rod, bearings, a first connecting rod and a second connecting rod. Wherein a groove is formed in the middle of the bottom of the first guiding rod, and a bearing is disposed therein. The second guiding rod is located above the first guiding rod, and the first guiding rod and the second guiding rod are disposed within the second connecting rod. On the right side of the crankshaft, there are a right scale shaft sleeve, a right scale handwheel locking bushing, a right bushing locking nut, a right handwheel cap and a right scale handwheel. On the left side of the crankshaft, there are installed a left scale shaft sleeve, a left scale handwheel locking bushing, a left bushing locking nut, a left handwheel cap and a left scale handwheel.

[0014] Technical effects of the present invention: In the traditional slit lamp microscope, there is only a scale on the left slit handwheel. Due to the error between the two axes, there is no scale on both the left and right handwheels, which brings inconvenience to users. The present invention adopts the method of an integral crankshaft, with scales on both sides, enabling users to observe the scale values with either the left eye or the right eye, which can relieve the visual fatigue of users and is effective for the health of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural diagram of a slit lamp microscope in the prior art

[0016] Figure 2 is a partial view of the guiding mechanism in the prior art

[0017] Figure 3 is a three-dimensional schematic diagram of the slit lamp microscope of the present invention

[0018] Figure 4 is a front view of the slit lamp microscope of the present invention

[0019] Figure 5 is a P - P sectional view of the slit lamp microscope of the present invention

[0020] Figure 6 is a rear view of the slit lamp microscope of the present invention

[0021] Figure 7 is a new guiding structure diagram of the slit lamp microscope of the present invention

[0022] Figure 8 is a schematic diagram of the first guide rod in the guiding structure DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] As Figure 1As shown in the figure, a slit lamp microscope generally includes a workbench 1, a patient head bracket 2, a slit lamp microscope base 3, a microscope 4, a slit lamp 5, an external transformer 6. The patient head bracket 2 includes an illumination bulb power cord 2.1, a patient forehead strap 2.2, a fixation lamp 2.3, a chin rest 2.4, a lifting handwheel 2.5, and a patient armrest 2.6. The fixation lamp 2.3 is a movable point light source used to guide the patient's eye position. The chin rest and the patient forehead strap together position the patient's head to facilitate the examination of the eyes. The lifting handwheel 2.5 adjusts the height of the chin rest to adjust the height of the patient's eye position to a suitable position. The slit lamp microscope base 3 has a main unit displacement control handle 3.1, and the up-and-down and left-and-right displacements of the main unit are achieved by rotating and pulling this handle. The microscope 4 includes an eyepiece 4.1 and a zoom handwheel 4.2. The slit lamp 5 includes a lamp source cover 5.1, a spot diameter indicating meter 5.2, a filter selection lever 5.3, a spot diameter selection button 5.4, a reflector 5.5, and a slit width adjustment handwheel 5.6. Among them, four different filter plates, namely a heat-insulating plate, a light-reducing plate, a red-free plate, and a cobalt blue plate, can be switched.

[0025] When using the slit lamp microscope, first guide the patient to sit on the patient seat and lean the chin on the chin rest of the patient bracket. Adjust the height of the chin rest so that the patient's cornea is located on the optical central axis of the instrument. Rotate the binocular head of the eyepiece to the pupil distance suitable for the observer, and adjust the eyepiece diopter until the slit light image on the focusing rod is clearly seen. According to the measurement purpose, respectively adjust the filter selection lever, the spot diameter selection button, and the slit width adjustment handwheel to select the appropriate filter and adjust the height and width of the slit light. Select the appropriate magnification method by rotating the zoom handwheel.

[0026] During the examination of the patient, the patient's eye position is guided by operating the main unit displacement control handle or using the fixation lamp to facilitate the observation of the patient's eye lesions. Adjustment of the slit light axis and the microscope light axis and the method of rotating the slit light: For the need of examining the patient's eyes, sometimes it is necessary to form a certain angle between the slit light axis and the microscope light axis or rotate the slit light by a certain angle.

[0027] To solve the error that occurs during use where the slit opening degree is inconsistent with the scale number on the slit opening handwheel, the present invention replaces the traditional two-axis structure with an integral crankshaft or an integral shaft to solve the existing defects and provides a new guiding structure, such as Figure 7As shown in the figure, the guiding mechanism is arranged inside the cam housing 8. The guiding mechanism includes a crankshaft 9, a first guide rod 12, a second guide rod 13, a bearing 28, a first connecting rod 10, and a second connecting rod 11. The first connecting rod and the second connecting rod are arranged in parallel. A groove is provided in the middle of the bottom of the first guide rod, and the bearing 28 is arranged therein and connected by a pin 29. The second guide rod 13 is located above the first guide rod 12. The first guide rod and the second guide rod are arranged inside the second connecting rod 11. A groove is provided on the side of the first guide rod, and a setscrew 15 is screwed into the second connecting rod. The crankshaft drives the first guide rod to move up and down through the bearing, and then drives the second connecting rod to move up and down.

[0028] On the right side of the crankshaft 9, there are a right friction plate 20, a right scale shaft sleeve 21, a right scale handwheel locking bushing 19, a right bushing locking nut 14, a right handwheel cap 18, and a right scale handwheel 16; on the left side of the crankshaft 9, there are installed a left scale shaft sleeve 22, a left friction plate 23, a left scale handwheel locking bushing 24, a left bushing locking nut 26, a left handwheel cap 25, and a left scale handwheel 27. Among them, a right scale shaft sleeve is rotatably arranged at the right end of the crankshaft 9. The right scale handwheel locking bushing 19 is sleeved on the crankshaft and abuts against the end of the right scale shaft sleeve. A sealing sheet is arranged between the right scale shaft sleeve and the right scale handwheel locking bushing. The right bushing locking nut 14 and the cap arranged on its right side fasten the right scale shaft sleeve and the right scale handwheel locking bushing on the crankshaft. By rotating the left and right scale handwheels on both sides of the crankshaft, the up and down movement of the second connecting rod can be achieved.

[0029] In the present invention, the crankshaft replaces the eccentric shaft. The crankshaft can be machined in one time by a numerical control machine tool, which can ensure the precision and concentricity of the parts. At the same time, a bearing is placed in a groove in the middle of the guide rod and connected by a rivet. In order to prevent the guide rod from rotating, a groove is opened on the guide rod, and a cylindrical setscrew is screwed into the connecting rod to make it move up and down stably without deflection, making the process of the present invention more reasonable, the parts with high precision more delicate, the feel of guiding smoother, the parts more integrated, and the guiding contact position more stable and effective. This not only greatly improves the feel of the user, but also qualitatively improves the performance of the whole machine. This structure is safe and reliable, with stable performance, greatly reducing the risk, reducing the rotation error between the left scale handwheel and the right scale handwheel, and the error value is zero.

[0030] In the traditional slit microscope, there is only a scale on the left handwheel of the slit handwheel. Due to the error between the two axes, there is no scale on both the left and right handwheels, which brings inconvenience to the user. Now, with a whole crankshaft having scales on both sides, the user can use the left eye or the right eye to observe the scale value, which can relieve the user's visual fatigue and is effective for the health of the patient.

[0031] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the above teachings or the skills or knowledge in the relevant field. Any alterations and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention shall fall within the scope of the appended claims of the present invention.

Claims

1. A slit opening and closing structure of a slit lamp microscope, the slit opening and closing structure comprising a guiding mechanism disposed within a convex machine housing of the slit lamp microscope, characterized in that, The guiding mechanism includes a crankshaft, a first guide rod, a second guide rod, a bearing, a first connecting rod and a second connecting rod. A groove is formed in the middle of the bottom of the first guide rod, and a bearing is arranged therein. The second guide rod is located above the first guide rod. The first guide rod and the second guide rod are arranged in the second connecting rod. A right scale bushing, a right scale handwheel locking bushing, a right bushing locking nut, a right handwheel cap and a right scale handwheel are arranged on the right side of the crankshaft. The handwheels on both the left and right sides have scales. A left scale bushing, a left scale handwheel locking bushing, a left bushing locking nut, a left handwheel cap and a left scale handwheel are installed on the left side of the crankshaft. A groove is formed in the middle of the bottom of the first guide rod, and a bearing is arranged therein and connected by a pin. A groove is formed on the side of the first guide rod, and a set screw is screwed into the second connecting rod. The crankshaft drives the first guide rod to move up and down through the bearing, and then drives the second connecting rod to move up and down. The crankshaft is integral.

2. The slit opening and closing structure of the slit lamp microscope according to claim 1, wherein a sealing sheet is arranged between the right scale bushing and the right scale handwheel locking bushing.

3. The slit opening and closing structure of the slit lamp microscope according to claim 1, wherein, A sealing sheet is arranged between the left scale bushing and the left scale handwheel locking bushing.

4. The slit opening and closing structure of the slit lamp microscope according to claim 1, wherein the right bushing locking nut and the cap arranged on its right side fasten the right scale bushing and the right scale handwheel locking bushing to the crankshaft.

5. A slit lamp microscope, which includes a workbench, a patient head bracket, a slit lamp microscope base, a microscope, a slit lamp and an external transformer. The slit lamp includes the slit opening and closing structure according to any one of claims 1-4.

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