CN210843483U - Corneal astigmatism axis marker, marking compass and marking system comprising same - Google Patents
Corneal astigmatism axis marker, marking compass and marking system comprising same Download PDFInfo
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- CN210843483U CN210843483U CN201921103605.8U CN201921103605U CN210843483U CN 210843483 U CN210843483 U CN 210843483U CN 201921103605 U CN201921103605 U CN 201921103605U CN 210843483 U CN210843483 U CN 210843483U
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Abstract
An axial marker and compass for corneal astigmatism. The marker comprises a handle, a fixing ring connected with the handle, a pair of ox horn-shaped fixing marking rulers connected with the fixing ring, a rotating ring coaxially arranged with the fixing ring and rotatably connected with the fixing ring, and a pair of ox horn-shaped rotating marking rulers connected with the rotating ring, wherein the two pairs of marking rulers are respectively and symmetrically arranged in the diameter directions of the fixing ring and the rotating ring and are provided with marking edges at the tips, the rotating marking rulers are superposed below the fixing marking rulers and can rotate relative to the fixing marking rulers, and the marking edges of the fixing marking rulers and the rotating marking rulers are respectively attached to the corneal scleral edge and the cornea during marking. The compass comprises two disks which are arranged in an overlapping mode and can rotate relatively, the tip end of the marker marking ruler can be clamped into a clamping groove of the disks, and the relative axis between the marker marking ruler and the disks is adjusted through the relative rotation between the disks, so that the marking of the vertical axis of the cornea and the astigmatism axis can be completed at one time, the operation steps are simplified, and the marking precision is improved.
Description
Technical Field
The present invention relates to an ophthalmic surgical instrument, and in particular to a corneal astigmatism axis marker, a marking compass and a marking system comprising the same.
Background
Corneal astigmatism is prevalent in cataractous people. The data from many sources show that there is corneal astigmatism above 1.0D preoperatively in about 30-40% of cataract patients. As is known, astigmatic patients often have blurred vision and asthenopia accompanied by various problems such as eye pain, lacrimation and visual persistence, and therefore need to be corrected. Astigmatism-correcting intraocular lenses (Toric IOLs) have been used in clinical applications today to allow surgeons to accurately correct a patient's corneal astigmatism while performing cataract surgery. Based on clinical experience, physicians have generally selected patients with regular corneal astigmatism ≧ 0.75D, and a desire to distance-vision aphakia, as the best indication for implanting Toric IOLs (regular astigmatism refers to astigmatism in which the principal meridian of maximum power and minimum power are perpendicular to each other). Where accurate astigmatism axis labeling is one of the most important factors for Toric IOLs to effectively correct corneal astigmatism, a Toric IOL offset of 3.3% will reduce the astigmatism correcting power per 1 deg., and a 30 deg. offset will cause the Toric IOL to lose all of its astigmatism correcting power and produce a change in the axis of astigmatism.
Prior to the implantation of an intraocular lens for cataract surgery in combination with astigmatism correction, the conventional method is to manually complete corneal vertical position marking (or corneal horizontal position marking) and Toric IOL placement axis marking using a prior art bullhorn marker in combination with a slit lamp and a graduated marking ring.
The horn marker in the prior art comprises a handle, a fixing ring fixedly connected with one end of the handle and a pair of horn-shaped marking rulers fixedly connected with the fixing ring, wherein the pair of horn-shaped marking rulers are symmetrically arranged in the diameter direction of the fixing ring.
The manual marking method comprises the following specific steps: first, the slit-lamp light strip is adjusted to be the smallest and longest in the longitudinal direction (or to the transverse direction) and the light strip is passed through the center of the patient's cornea, and two corneal vertical marks are made at the 6 o ' clock and 12 o ' clock positions on the patient's corneoscleral limbus (or two corneal horizontal marks are made at the 3 o ' clock and 9 o ' clock positions on the patient's corneoscleral limbus). Then, using the graduated ring to align the longitudinal two corneal vertical marks (or the transverse two corneal horizontal marks), the Toric IOL placement axis is found and the patient's cornea is marked with a Toric IOL placement axis using a bovine horn marker.
That is, the conventional method requires two steps, which are relatively complicated to perform the making of the corneal vertical position marker (or corneal horizontal position marker) and the Toric IOL placement axis marker, respectively. Furthermore, in Toric IOL placement axis marking on a patient's cornea, the marking ring can only be made in smaller sizes because the ring needs to be placed around the limbus in the eyelid, so that the marking accuracy of the ring is limited to the size, which is typically only 10 °. Due to the fact that the scale precision of the marking ring is not high enough, the Toric IOL placing axis and the actual corneal astigmatism axis can deviate to a certain degree, the astigmatism correcting effect of the Toric IOL is reduced, and therefore under-correction or over-correction of corneal astigmatism of a patient can occur after surgery, the residual astigmatism degree can occur, and the naked eye vision of the patient is affected.
Purpose of the utility model
In order to overcome the deficiencies in the prior art, the utility model provides a cornea astigmatism axis marker, include:
-a handle;
-a fixing ring fixedly connected to one end of the handle;
a pair of ox horn-shaped fixed marking rulers fixedly connected with the fixing ring, symmetrically arranged in the diameter direction of the fixing ring and having marking edges at the tips thereof which can be fitted with the corneoscleral rim;
-a rotating ring arranged coaxially with the fixed ring and rotatably connected therewith; and
a pair of bull horn shaped rotary marking rulers fixedly connected to the rotary ring, symmetrically arranged in the diametrical direction of the rotary ring and having at their tips marking edges conformable to the cornea,
the pair of the horn-shaped rotating marking rulers are designed to be arranged below the pair of the horn-shaped fixed marking rulers in an overlapped mode and can rotate relative to the pair of the horn-shaped fixed marking rulers through the rotation of the rotating ring relative to the fixed ring;
the pair of the bovine horn-shaped fixed marking rulers and the pair of the bovine horn-shaped rotating marking rulers are designed in such a way that when the corneal astigmatism axis marker is marked close to the cornea, the marking edges at the tips of the pair of the bovine horn-shaped fixed marking rulers are attached to the corneal scleral edge, and simultaneously, the marking edges at the tips of the pair of the bovine horn-shaped rotating marking rulers are attached to the cornea.
Preferably, the rotatable connection between the rotating ring and the stationary ring is a damped rotatable connection.
Alternatively, the damped rotatable connection is achieved by a rubber gasket disposed between the rotating ring and the stationary ring.
Alternatively, the damped rotatable connection is achieved by surface roughening the interface between the rotating ring and the stationary ring.
The utility model also provides a corneal astigmatism axis marking compass which can be used with the corneal astigmatism axis marker, the corneal astigmatism axis marking compass comprises two disks which are arranged in a superposition way,
the upper disc is provided with a central hole, the center of the lower disc is provided with a cylindrical bulge, the cylindrical bulge of the lower disc is rotatably connected in the central hole of the upper disc,
the upper surface of the upper disc and the upper surface of the cylindrical bulge of the lower disc are respectively provided with a pair of clamping grooves in the diameter direction, the two pairs of clamping grooves are designed in such a way that when the tips of a pair of ox horn-shaped fixed marking rulers of the corneal astigmatism axis marker are clamped into the pair of clamping grooves of the upper disc, the tips of a pair of ox horn-shaped rotating marking rulers of the corneal astigmatism axis marker can be clamped into the pair of clamping grooves of the cylindrical bulge of the lower disc, so that when the lower disc rotates relative to the upper disc, the lower disc drives the pair of ox horn-shaped rotating marking rulers to rotate relative to the pair of ox horn-shaped fixed marking rulers,
the upper surface of the upper disc is provided with an astigmatic axis position indicating line, the periphery of the upper surface of the lower disc is provided with angle scales, and when the two discs are arranged in a superposed manner, the angle scales on the lower disc are exposed to the outside.
Optionally, the astigmatism axis position indicating line on the upper disc is aligned with the diameter of the upper clamping groove, the 90-degree angle scale in the angle scales on the lower disc is aligned with the diameter of the upper clamping groove, the 0-180-degree angle scale is arranged clockwise from the 3 o 'clock position to the 9 o' clock position, and the 0-180-degree angle scale is continuously and repeatedly arranged clockwise from the 9 o 'clock position to the 3 o' clock position.
Optionally, the astigmatism axis position indicating line on the upper disc is aligned with the diameter of the upper clamping groove, the angle scales of 0 degree and 180 degrees in the angle scales on the lower disc are aligned with the diameter of the upper clamping groove, the angle scales of 0 degree to 180 degrees are arranged anticlockwise from the 3 o 'clock position to the 9 o' clock position, and the angle scales of 0 degree to 180 degrees are repeatedly arranged anticlockwise from the 9 o 'clock position to the 3 o' clock position continuously.
Preferably, the rotatable connection between the lower disc and the upper disc is a damped rotatable connection.
Alternatively, the damped rotatable connection is achieved by a rubber pad disposed between the cylindrical protrusion of the lower disc and the central aperture of the upper disc.
Alternatively, the damped rotatable connection is achieved by surface roughening the interface between the cylindrical protrusion of the lower disc and the central hole of the upper disc.
Preferably, the diameter of the lower disc is designed to allow an angular indexing thereon of up to 1 ° accuracy.
The utility model also provides an astigmatism axis marking system, including foretell cornea astigmatism axis marker and foretell cornea astigmatism axis mark compass.
Drawings
Figure 1 is a schematic front view of a corneal astigmatism axis marker according to the present invention;
figure 2 is a schematic top view of a corneal astigmatism axis marker according to the invention;
figure 3 is a schematic right view of a corneal astigmatism axis marker according to the invention;
figure 4 is a schematic front view of a corneal astigmatism axial marking compass according to the present invention;
figure 5 is a side view schematic of a corneal astigmatism axial marking compass according to the present invention;
FIG. 6 is a schematic front view of a corneal astigmatism axis marker and a compass used in conjunction therewith in a first position according to the present invention;
FIG. 7 is a schematic cross-sectional view of a corneal astigmatism axis marker and a compass used in conjunction therewith in a first state, in accordance with the present invention;
figure 8 is a schematic front view of a corneal astigmatism axis marker and a compass used in conjunction therewith in a second position according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the following description is intended to be illustrative, and not restrictive.
Referring to figures 1-3, there is shown a corneal astigmatism axis marker 1 according to the invention. The corneal astigmatism axis marker 1 comprises a handle 10, a fixed ring 11 fixedly connected with one end of the handle 10, a pair of ox horn-shaped fixed marking rulers 12 fixedly connected with the fixed ring 11, a rotating ring 13 coaxially arranged with the fixed ring 11 and rotatably connected with the fixed ring 11, and a pair of ox horn-shaped rotating marking rulers 14 fixedly connected with the rotating ring 13. The horn-shaped fixed marking ruler 12 is symmetrically arranged in the diameter direction of the fixing ring 11 and has a marking edge at the tip 121 that can be brought into abutment with the corneoscleral rim. The bovine horn-shaped rotary marking ruler 14 is symmetrically arranged in the diameter direction of the rotary ring 13 and has a marking edge at the tip 141 which can be brought into abutment with the cornea.
The bovine horn shaped rotary marking ruler 14 is designed to be arranged in a superposed manner below the bovine horn shaped fixed marking ruler 12, and the rotation of the bovine horn shaped rotary marking ruler 14 with respect to the bovine horn shaped fixed marking ruler 12 can be realized by the rotation of the rotating ring 13 with respect to the fixed ring 11. That is, the operator can rotate the bovine horn shaped rotary marking ruler 14 with one hand by grasping the handle 10 of the corneal astigmatism axis marker 1 with the other hand, so that the bovine horn shaped rotary marking ruler 14 is rotationally moved relative to the bovine horn shaped fixed marking ruler 12.
The bovine horn fixed marking ruler 12 and the bovine horn rotary marking ruler 14 are designed such that when the axial corneal astigmatism marker 1 is marked close to the cornea, the marking edge of the tip 121 of the bovine horn fixed marking ruler 12 abuts the corneal scleral rim, while the marking edge of the tip 141 of the bovine horn rotary marking ruler 14 abuts the cornea. Thus, the operator can use the corneal astigmatism axis marker of the present invention to mark the vertical axis of the cornea and the TorciIOL placement axis of the cornea at a time and simultaneously on the patient's corneal limbus and cornea, respectively.
Preferably, the rotatable connection between the rotating ring 13 and the stationary ring 11 is a damped rotatable connection. Alternatively, the damped rotatable connection may be achieved by a rubber gasket 15 (shown in fig. 2 and 7) disposed between the rotating ring 13 and the stationary ring 11. Alternatively, the damped rotatable connection may be achieved by surface roughening the contact surface between the rotating ring 13 and the stationary ring 11. The rotary ring 13 and the fixed ring 11 are designed into a rotary connection with damping, so that when an operator applies a certain amount of rotary force to overcome the damping, the ox horn rotary marking ruler 14 can be rotated relative to the ox horn fixed marking 12 to reach a required axial position, and at the moment, under the condition of no external force or small external force which is not enough to overcome the damping, the axial position of the ox horn rotary marking ruler 14 is locked.
Referring to fig. 4-5, there is shown a corneal astigmatism axis marking compass 2 according to the invention. The corneal astigmatism axis marking compass 2 can be used with the corneal astigmatism axis marker 1 of the present invention and comprises two discs 21, 22 arranged one above the other. The upper disc 21 has a central hole 211, the lower disc 22 has a cylindrical protrusion 221 at the center, and the cylindrical protrusion 221 of the lower disc 22 is rotatably coupled in the central hole 211 of the upper disc 21.
The upper surface of the upper disk 21 is provided with a pair of catching grooves 212 in the diameter direction. The upper surface of the cylindrical protrusion 221 of the lower disk 22 is also provided with a pair of catching grooves 222 in the diameter direction. The slots 212, 222 are designed such that while the tips 121 of the pair of bullhorn-shaped fixed markers 12 of the axial corneal astigmatism marker 1 are snapped into the pair of slots 212 of the upper disc 21, the tips 141 of the pair of bullhorn-shaped rotary markers 14 of the axial corneal astigmatism marker 1 can be snapped into the pair of slots 222 of the cylindrical protrusion 221 of the lower disc 22. Thus, when the lower disc 22 rotates relative to the upper disc 21, the lower disc 22 drives the ox horn shaped rotary marking ruler 14 to rotate relative to the ox horn shaped fixed marking ruler 12. That is, the corneal astigmatism axis marking compass 2 of the present invention can be used in cooperation with the corneal astigmatism axis marker 1 of the present invention. When the rotary marking device is used, the tips 121 of the pair of the horn-shaped fixed marking rulers 12 of the marking device 1 are clamped into the clamping grooves 212 of the upper disc 21 of the compass 2, the tips 141 of the pair of the horn-shaped rotary marking rulers 14 of the marking device 1 are clamped into the clamping grooves 222 of the cylindrical protrusions 221 of the lower disc 22 of the compass 2, the lower disc 22 of the compass 2 is rotated relative to the upper disc 21, and the lower disc 22 drives the horn-shaped rotary marking rulers 14 to rotate relative to the horn-shaped marking rulers 12 to reach the required axial position.
The upper surface of the upper disc 21 is provided with astigmatic axis position indicating lines 213 and the periphery of the upper surface of the lower disc 22 is provided with angle scales 223 which are exposed to view when the two discs are arranged one on top of the other.
Preferably, the astigmatism axis position indicator line 213 on the upper disc 21 is aligned with the diameter of the catch 212 on the upper disc 21, the 90 ° angle scale of the angle scale 223 on the lower disc 22 is aligned with the diameter of the catch 222 on the lower disc 22, the 0 ° -180 ° angle scale is arranged clockwise from the 3 o 'clock position to the 9 o' clock position, and the 0 ° -180 ° angle scale is repeated clockwise from the 9 o 'clock position to the 3 o' clock position. That is, on the periphery of the lower disk 22, the angle scales of the lower half are arranged clockwise from 0 ° at the 3 o 'clock position, 90 ° at the 6 o' clock position, to 180 ° at the 9 o 'clock position, and the angle scales of the upper half are arranged clockwise from 0 ° at the 9 o' clock position, 90 ° at the 12 o 'clock position, to 180 ° at the 3 o' clock position, where the 3 o 'clock, 9 o' clock positions 0 ° and 180 ° coincide. When the marker 1 and the compass 2 are used in combination, when the lower disc 22 of the compass 2 is rotated relative to the upper disc 21 until the axis of astigmatism indication line 213 on the upper disc 21 is aligned with the desired axis indicated by the angle scale 223 on the lower disc 22, the angle of the bull horn shaped rotary marker ruler 14 of the marker 1 relative to the bull horn shaped fixed marker ruler 12 is adjusted to: if the bullhorn fixed marker 12 of the marker 1 is aligned with the vertical axis of the cornea, the bullhorn rotary marker 14 will be aligned with the axis of corneal astigmatism, i.e., the Toric IOL placement axis. At this point, the corneal vertical axis marking and the Toric IOL placement axis marking may be done simultaneously.
Alternatively, the astigmatism axis position indicator 213 on the upper disc 21 is aligned with the diameter of the upper bayonet slot 212, the 0 ° and 180 ° angular scales of the angular scale 223 on the lower disc 22 are aligned with the diameter of the upper bayonet slot 222, the 0 ° -180 ° angular scales are arranged counterclockwise from the 3 o 'clock position to the 9 o' clock position, and the 0 ° -180 ° angular scales are repeatedly arranged counterclockwise from the 9 o 'clock position to the 3 o' clock position (this embodiment is not shown). That is, on the periphery of the lower disk 22, the angle scales of the lower half are arranged counterclockwise from 0 ° at 9 o 'clock, 90 ° at 6 o' clock to 180 ° at 3 o 'clock, and the angle scales of the upper half are arranged counterclockwise from 0 ° at 3 o' clock, 90 ° at 12 o 'clock to 180 ° at 9 o' clock, where 3 o 'clock, 9 o' clock, 0 ° and 180 ° coincide. When the marker 1 and the compass 2 are used in combination, when the lower disc 22 of the compass 2 is rotated relative to the upper disc 21 until the axis of astigmatism indication line 213 on the upper disc 21 is aligned with the desired axis indicated by the angle scale 223 on the lower disc 22, the angle of the bull horn shaped rotary marker ruler 14 of the marker 1 relative to the bull horn shaped fixed marker ruler 12 is adjusted to: if the bullhorn fixed marker 12 of the marker 1 is aligned with the horizontal axis of the cornea, the bullhorn rotary marker 14 will be aligned with the axis of corneal astigmatism, i.e., the Toric IOL placement axis. At this point, the horizontal corneal axis marking and the Toric IOL placement axis marking may be done simultaneously.
Alternative embodiments are also conceivable, such as an upper disc 21 with angular graduations on its upper surface at its periphery and a lower disc 22 with astigmatism axis indicating lines on its upper surface (this embodiment is also not shown). As long as the pair of the bovine horn-shaped fixed marking rulers 12 of the corneal astigmatism axis marker 1 are positioned at the vertical axis (or the horizontal axis) of the cornea, the astigmatism axis indicating line and the angle scale can indicate the required astigmatism axis position for helping the bovine horn-shaped rotating marking ruler 14 to be positioned.
Preferably, the rotatable connection between the lower disc 22 and the upper disc 21 is a damped rotatable connection. Alternatively, the damped rotatable connection is achieved by a rubber pad 23 (shown in fig. 4 and 7) disposed between the cylindrical protrusion 221 of the lower disc 22 and the central aperture 211 of the upper disc 21. Alternatively, the damped rotatable connection is achieved by surface roughening the contact surface between the cylindrical protrusion 221 of the lower disc 22 and the central hole 211 of the upper disc 21. The rotatable connection between the lower disc 22 and the upper disc 21 is designed to be damped so that when the operator applies a certain amount of rotational force to overcome the damping, the lower disc 22 can be rotated relative to the upper disc 21 until the astigmatic axis indicator 213 on the upper disc 21 indicates the desired axis, at which time the position of the lower disc 22 relative to the upper disc 21 is locked without external force or with a small amount of external force insufficient to overcome the damping.
The diameter of the lower disc 22 is designed to allow the accuracy of the angular scale 223 thereon to reach 1 deg.. It is known that the larger the diameter of the disc, the higher the accuracy of the angular scale thereon can be. The prior art graduated ring is small in size because it is placed around the scleral rim of the inner eyelid, and the angular graduation thereon can only be calibrated to an accuracy of 10 °. The utility model discloses a cornea astigmatism axis mark compass 2 is owing to adjust the relative axis position between the fixed mark chi 12 of ox horn shape and the ox horn shape rotation mark chi 14 of cornea astigmatism axis marker 1 outside the eye, so the disc diameter of compass can be made relatively great, and the angle scale precision consequently can be relatively higher to overcome not enough among the prior art.
Referring to figures 6-8, there is shown a corneal astigmatism axis marking system according to the invention comprising the corneal astigmatism axis marker 1 and astigmatism axis marking compass 2 described above. The specific operation steps of the corneal astigmatism axis marking system are described below. First, the operator snaps the tips 121 of the pair of bull horn shaped fixed markers 12 of the corneal astigmatism axis marker 1 into the snap grooves 212 on the upper disc 21 of the astigmatism axis marking compass 2, and simultaneously snaps the tips 141 of the pair of bull horn shaped rotary markers 14 of the marker 1 into the snap grooves 222 on the central cylindrical protrusion 221 of the lower disc 22. Next, the operator grips the handle 10 of the marker 1 with one hand and turns the lower disc 22 of the compass 2 with the other hand until the axis of astigmatism indicator line 213 on the upper disc 21 of the compass 2 is aligned with the desired axis of astigmatism (legend 30 °), releases the other hand to turn the lower disc 22 of the compass 2 no longer and separates the compass 2 from the marker 1, at which time the relative axes of the fixed and rotatable bull horn markers 12, 14 of the marker 1 are locked. Finally, the operator holds the marker 1 close to the cornea of the patient by hand, aligns the ox horn-shaped fixed marking ruler 12 with the vertical axis of the cornea marked by the slit lamp strip, and then presses the marker downward toward the cornea, thus completing the marking of the vertical axis of the cornea on the corneoscleral margin of the patient and the marking of the astigmatism axis on the cornea at the same time in one time.
It is from top to bottom visible, use according to the utility model discloses a two kinds of marks can once only be accomplished simultaneously to cornea astigmatism axle position mark system, have simplified operating procedure to astigmatism axle position mark precision has been improved.
Claims (10)
1. An axial marker of corneal astigmatism, comprising:
-a handle;
-a fixing ring fixedly connected to one end of the handle;
a pair of ox horn-shaped fixed marking rulers fixedly connected with the fixing ring, symmetrically arranged in the diameter direction of the fixing ring and having marking edges at the tips thereof which can be fitted with the corneoscleral rim;
-a rotating ring arranged coaxially with the fixed ring and rotatably connected therewith; and
a pair of bull horn shaped rotary marking rulers fixedly connected to the rotary ring, symmetrically arranged in the diametrical direction of the rotary ring and having at their tips marking edges conformable to the cornea,
the pair of the horn-shaped rotating marking rulers are designed to be arranged below the pair of the horn-shaped fixed marking rulers in an overlapped mode and can rotate relative to the pair of the horn-shaped fixed marking rulers through the rotation of the rotating ring relative to the fixed ring;
the pair of the bovine horn-shaped fixed marking rulers and the pair of the bovine horn-shaped rotating marking rulers are designed in such a way that when the corneal astigmatism axis marker is marked close to the cornea, the marking edges at the tips of the pair of the bovine horn-shaped fixed marking rulers are attached to the corneal scleral edge, and simultaneously, the marking edges at the tips of the pair of the bovine horn-shaped rotating marking rulers are attached to the cornea.
2. The axial corneal astigmatism marker of claim 1, wherein the rotatable connection between the rotating ring and the stationary ring is a damped rotatable connection.
3. The axial corneal astigmatism marker of claim 2, wherein the damped rotatable connection is achieved by a rubber pad disposed between the rotating ring and the stationary ring or by a surface roughening of the interface between the rotating ring and the stationary ring.
4. An axial corneal astigmatism marking compass usable with an axial corneal astigmatism marker as claimed in any one of claims 1 to 3, said axial corneal astigmatism marking compass comprising two discs arranged one above the other,
the upper disc is provided with a central hole, the center of the lower disc is provided with a cylindrical bulge, the cylindrical bulge of the lower disc is rotatably connected in the central hole of the upper disc,
the upper surface of the upper disc and the upper surface of the cylindrical bulge of the lower disc are respectively provided with a pair of clamping grooves in the diameter direction, the two pairs of clamping grooves are designed in such a way that when the tips of a pair of ox horn-shaped fixed marking rulers of the corneal astigmatism axis marker are clamped into the pair of clamping grooves of the upper disc, the tips of a pair of ox horn-shaped rotating marking rulers of the corneal astigmatism axis marker can be clamped into the pair of clamping grooves of the cylindrical bulge of the lower disc, so that when the lower disc rotates relative to the upper disc, the lower disc drives the pair of ox horn-shaped rotating marking rulers to rotate relative to the pair of ox horn-shaped fixed marking rulers,
the upper surface of the upper disc is provided with an astigmatic axis position indicating line, the periphery of the upper surface of the lower disc is provided with angle scales, and when the two discs are arranged in a superposed manner, the angle scales on the lower disc are exposed to the outside.
5. The corneal astigmatism axis marking compass of claim 4, wherein the astigmatism axis indicator line on the upper disc is aligned with the diameter of the upper groove, the 90 ° angle scale on the lower disc is aligned with the diameter of the upper groove, the 0 ° -180 ° angle scale is clockwise arranged from 3 o 'clock position to 9 o' clock position, and the 0 ° -180 ° angle scale is repeated clockwise from 9 o 'clock position to 3 o' clock position.
6. The corneal astigmatism axis marking compass of claim 4, wherein the astigmatism axis indicator on the upper disc is aligned with the diameter of the upper groove, the 0 ° and 180 ° angular scales on the lower disc are aligned with the diameter of the upper groove, the 0 ° -180 ° angular scales are arranged counterclockwise from 3 o 'clock position to 9 o' clock position, and the 0 ° -180 ° angular scales are repeated counterclockwise from 9 o 'clock position to 3 o' clock position.
7. The corneal astigmatism axis marking compass of claim 4, wherein the rotatable connection between the lower disc and the upper disc is a damped rotatable connection.
8. The corneal astigmatism axis marking compass of claim 7, wherein the damped rotatable connection is achieved by a rubber pad disposed between the cylindrical protrusion of the lower disc and the central aperture of the upper disc, or by a surface roughening treatment of the interface between the cylindrical protrusion of the lower disc and the central aperture of the upper disc.
9. A corneal astigmatism axis marking compass as claimed in any one of claims 4 to 8, in which the diameter of the lower disc is designed to allow an angular scale thereon to be accurate to 1 °.
10. An astigmatic axis marking system, comprising: an axial marker of corneal astigmatism as defined in any one of claims 1 to 3 and an axial marker of corneal astigmatism compass as defined in any one of claims 4 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110236695A (en) * | 2019-07-15 | 2019-09-17 | 北京大学第三医院（北京大学第三临床医学院） | Corneal astigmatism axle position marker, label compass and the tagging system including them |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110236695A (en) * | 2019-07-15 | 2019-09-17 | 北京大学第三医院（北京大学第三临床医学院） | Corneal astigmatism axle position marker, label compass and the tagging system including them |
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