CN113907702B - Air cylinder device and air path system for non-contact tonometer - Google Patents
Air cylinder device and air path system for non-contact tonometer Download PDFInfo
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- CN113907702B CN113907702B CN202111211929.5A CN202111211929A CN113907702B CN 113907702 B CN113907702 B CN 113907702B CN 202111211929 A CN202111211929 A CN 202111211929A CN 113907702 B CN113907702 B CN 113907702B
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/16—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for measuring intraocular pressure, e.g. tonometers
- A61B3/165—Non-contacting tonometers
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Abstract
The invention relates to the technical field of non-contact tonometers, in particular to a cylinder device and an air path system for a non-contact tonometer, which comprise a cylinder with a chamber and a piston capable of reciprocating in the chamber, wherein a first through hole for communicating the chamber with the outside air is formed in the cylinder at the tail end of the movement stroke of the piston; and the sealing device is arranged on the cylinder and is suitable for closing or opening the first through hole. The invention can solve the defect that the position of the piston in the non-contact tonometer in the prior art is not easy to determine.
Description
Technical Field
The invention relates to the technical field of non-contact tonometers, in particular to an air cylinder device and an air path system for a non-contact tonometer.
Background
Tonometers are now widely used for measuring intraocular pressure in the eye, and by measuring intraocular pressure, reference can be made for the diagnosis and treatment of glaucoma and related ophthalmic diseases. The tonometer is manufactured according to the principle of Imbert-Fick. The principle is to calculate the intraocular pressure by dividing the pressure exerted on the cornea by the contact area. The non-contact tonometer realizes cornea applanation in a certain area in a non-contact mode by utilizing air pressure, and calculates intraocular pressure by recording the change of an optoelectronic signal in the process of cornea applanation. The non-contact tonometer can avoid the contact between an external pressure applying object and the cornea, thereby improving the comfort of tonometry and effectively avoiding the risk of cross infection among patients.
Non-contact tonometers are becoming more and more attractive and available for use because of their comfort, lack of cross-contamination, and the like. How to ensure the measurement accuracy and stability of the non-contact tonometer becomes the key point of research. Most of the existing non-contact tonometers apply pressure to eyes by injecting compressed air through a combination of a cylinder, a piston and a solenoid valve. The electromagnetic valve drives the piston to move back and forth to compress air, the compressed air enters the air chamber through the air duct, and the air is sprayed to the cornea through the specific spray head, so that the cornea is flattened.
The intraocular pressure is measured through the air pressure generated by the piston movement, so the accuracy of the pressure in the cylinder directly influences the accuracy and stability of the intraocular pressure value, and the pressure in the cylinder is mainly determined by the volume of the cylinder and the position of the piston. The normal intraocular pressure is about 10mmHg-21mmHg, and the intraocular pressure of patients suffering from glaucoma or other eye diseases is high, and the intraocular pressure meter is required to measure 60 mmHg. High intraocular pressure values require a sufficiently high pressure for the air ejection and low intraocular pressure values require a relatively low ejection pressure. Since the measurement of intraocular pressure belongs to weak signal measurement, in order to ensure the measurement accuracy, it is required that the piston can be accurately stopped at a preset position, but due to inertial movement, the piston is difficult to stop at the preset position, especially when measuring a low intraocular pressure value. Because inertial motion, the piston can continue to move forward, leads to jet-propelled pressure too big, has influenced the accuracy and the stability of intraocular pressure measurement on the one hand, and on the other hand, too much gas is jetted to people's eye, has reduced the travelling comfort. In addition, after the air injection is finished, when the piston returns to the initial position, negative pressure can be generated in the air cylinder, so that external air, particularly mist formed by scattering of tear mist due to the air injection, can be sucked into the air cavity, and the performance of internal components can be influenced for a long time.
Disclosure of Invention
Therefore, the invention aims to solve the defect that the position of a piston in a non-contact tonometer in the prior art is not easy to determine, and provides a cylinder device and an air path system for the non-contact tonometer.
A cylinder device for a non-contact tonometer comprises a cylinder with a chamber and a piston capable of reciprocating in the chamber, wherein a first through hole for communicating the chamber with the outside air is formed in the cylinder at the tail end of the motion stroke of the piston; and the sealing device is arranged on the cylinder and is suitable for closing or opening the first through hole.
Optionally, the sealing device includes a blocking piece, a sliding groove is formed in a wall of the end portion of the air cylinder, the first through hole penetrates through the sliding groove, the blocking piece is located in the sliding groove and in sliding fit with the sliding groove, and the blocking piece is used for blocking the first through hole.
Optionally, a second through hole is communicated with a groove wall of the sliding groove, and one end, far away from the sliding groove, of the second through hole is communicated with the outside.
Optionally, a third through hole is communicated with the groove wall of the sliding groove, a sliding rod is connected in the third through hole in a sliding manner, the sliding rod is connected with the blocking piece, an air pump is connected to the side wall of the air cylinder, and the air pump is communicated with the third through hole.
Optionally, the size of the blocking piece is larger than that of the first through hole.
An air path system for a non-contact tonometer comprises the air cylinder device and an air injection device connected with the air cylinder device.
Optionally, the air jet system includes air duct, air cavity and air nozzle, the air duct with cylinder tip intercommunication, the air duct is kept away from the cylinder one end with the air cavity intercommunication, the air nozzle is used for spraying gas to the people's eye.
Optionally, the end of the cylinder is communicated with a connecting pipe, and the gas guide pipe is inserted into the connecting pipe and is in threaded connection with the connecting pipe.
Optionally, the size of the air nozzle is smaller than the size of the first through hole.
Optionally, a fourth through hole is formed in the side wall of the cylinder, and the fourth through hole is used for controlling the initial position of the piston.
The technical scheme of the invention has the following advantages:
1. the invention provides a cylinder device for a non-contact tonometer, which comprises a cylinder with a chamber and a piston capable of reciprocating in the chamber, wherein a first through hole for communicating the chamber with the outside air is formed in the cylinder at the tail end of the motion stroke of the piston; and the sealing device is arranged on the cylinder and is suitable for closing or opening the first through hole. Through the arrangement, when the air cylinder performs air injection action, the piston starts to be started, the first through hole in the air cylinder is in a closed state, and after the piston reaches a preset position, the sealing device opens the first through hole, so that excessive air caused by inertia of the piston is discharged through the first through hole; when the piston returns to the initial position, the first through hole is always in the open state, so that the outside air can be rapidly filled into the cylinder in the process of the piston moving back, and the phenomenon that the mist scattered by tear mist at the air nozzle is reversely sucked into the cavity is avoided. When the piston returns to the initial position, the opening is sealed, and the next piston movement is started.
2. The invention provides an air cylinder device for a non-contact tonometer, which comprises a blocking piece, wherein a sliding groove is formed in the cylinder wall of the end part of an air cylinder, a first through hole penetrates through the sliding groove, the blocking piece is positioned in the sliding groove and is in sliding fit with the sliding groove, and the blocking piece is used for blocking the first through hole. Through the arrangement, the blocking piece is controlled by an operator to slide in the sliding groove, the first through hole can be closed when the blocking piece covers the first through hole, and the first through hole can be opened when the blocking piece does not cover the first through hole, so that the novel electric heating cooker is convenient and fast.
3. According to the cylinder device for the non-contact tonometer, the wall of the sliding groove is communicated with the second through hole, and one end, far away from the sliding groove, of the second through hole is communicated with the outside. Through the arrangement, the air pressure in the sliding groove is ensured to be the same as the external air pressure by the aid of the second through holes, so that the blocking piece can slide in the sliding groove more smoothly.
4. The cylinder device for the non-contact tonometer, provided by the invention, is characterized in that a third through hole is communicated on the wall of the sliding groove, a sliding rod is connected in the third through hole in a sliding manner, the sliding rod is connected with the blocking piece, and the side wall of the cylinder is connected with an air pump which is communicated with the third through hole. Through the arrangement, an operator controls the air pump to inject air into the third through hole, so that the air pressure in the third through hole can be increased, the slide rod is pushed to move upwards, the slide rod drives the blocking piece to move upwards, and the first through hole can be closed; otherwise, the operator controls the air pump to pump air in the third through hole, so that air pressure in the third through hole can be reduced, the slide rod moves downwards, the slide rod drives the blocking piece to move downwards, and the first through hole can be opened.
5. The cylinder device for the non-contact tonometer provided by the invention has the advantages that the size of the baffle is larger than that of the first through hole. Through the arrangement, the blocking piece can be more tightly shielded from the first through hole due to the fact that the size of the blocking piece is larger than that of the first through hole, and therefore the sealing performance of the sealing device is improved.
6. The air path system for the non-contact tonometer provided by the invention comprises the air cylinder device and the air injection device connected with the air cylinder device. Through the arrangement, an operator can spray air to human eyes by using the air cylinder device and the air spraying device, so that intraocular pressure is measured.
7. The air channel system for the non-contact tonometer provided by the invention comprises an air guide pipe, an air chamber and an air nozzle, wherein the air guide pipe is communicated with the end part of the air cylinder, one end of the air guide pipe, which is far away from the air cylinder, is communicated with the air chamber, the air nozzle is communicated with the air chamber, and the air nozzle is used for spraying air to human eyes. Through the arrangement, the piston moves in the cavity, gas in the cavity is pushed out from the end part of the cylinder, and the gas enters the gas cavity through the gas guide pipe and is sprayed out through the gas nozzle.
8. The air path system for the non-contact tonometer provided by the invention has the advantages that the end part of the air cylinder is communicated with the connecting pipe, and the air guide pipe is inserted into the connecting pipe and is in threaded connection with the connecting pipe. Through the arrangement, the air guide pipe is communicated with the cavity of the air cylinder in a manner of being connected with the connecting pipe in a threaded manner, so that the air guide pipe is convenient to disassemble and high in air tightness.
9. According to the air path system for the non-contact tonometer, the size of the air nozzle is smaller than that of the first through hole. Through the setting, the size of the air nozzle is smaller than that of the first through hole, so that the mist dispersed by the tear mist at the air nozzle is difficult to be sucked into the air cavity chamber when the piston moves back.
10. The air path system for the non-contact tonometer provided by the invention is characterized in that a fourth through hole is arranged on the side wall of the cylinder, and the fourth through hole is used for controlling the initial position of the piston. With the above arrangement, the compressed gas is discharged from the chamber through the fourth through hole before the piston passes through the fourth through hole, thereby obtaining an effect of changing the initial position of the piston.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a cylinder device for a non-contact tonometer according to an embodiment of the application;
fig. 2 is a schematic structural diagram of an air circuit system for a non-contact tonometer according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a baffle and a sliding rod of a cylinder device for a non-contact tonometer according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an air injection device of an air path system for a non-contact tonometer according to an embodiment of the present application.
Description of the reference numerals: 1. a cylinder; 2. a first through hole; 3. a baffle plate; 4. a chute; 5. a second through hole; 6. a third through hole; 7. a slide bar; 8. an air pump; 9. an air duct; 10. a gas chamber; 11. an air nozzle; 12. a connecting pipe; 13. a fourth via hole; 14. an electromagnetic valve; 15. a linkage mechanism.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Referring to fig. 1-4, the cylinder device for the non-contact tonometer provided by the invention comprises a cylinder 1 with a chamber and a piston capable of reciprocating in the chamber, wherein a first through hole 2 for communicating the chamber with the outside air is formed in the cylinder 1 at the tail end of the movement stroke of the piston; and the sealing device is arranged on the cylinder 1 and is suitable for closing or opening the first through hole 2.
Through the arrangement, when the air cylinder 1 performs air injection, the piston starts to be started, the first through hole 2 in the air cylinder 1 is in a closed state, and after the piston reaches a preset position, the sealing device opens the first through hole 2 at the moment, so that excessive air caused by piston inertia is exhausted through the first through hole 2; when the piston returns to the initial position, the first through hole 2 is always in the open state, so that the outside air can be rapidly filled in the cylinder 1 when the piston moves back, and the phenomenon that the scattered mist of the tear mist at the air nozzle 11 is reversely sucked into the cavity is avoided. When the piston returns to the initial position, the opening is sealed, and the next piston movement is started.
Wherein the movement of the piston is controlled by a solenoid valve 14 via a linkage 15.
Sealing device includes separation blade 3, is equipped with spout 4 on the jar wall of 1 tip of cylinder, and first through-hole 2 passes spout 4, and separation blade 3 is located spout 4 and with spout 4 sliding fit, and separation blade 3 is used for plugging up first through-hole 2. Through the setting, operating personnel control separation blade 3 slides in spout 4, hides first through-hole 2 when separation blade 3 and can make first through-hole 2 seal, does not hide first through-hole 2 when separation blade 3 and can make first through-hole 2 open convenient and fast.
The wall of the chute 4 is communicated with a second through hole 5, and one end of the second through hole 5, which is far away from the chute 4, is communicated with the outside. Through the arrangement, the second through hole 5 is used for ensuring that the air pressure in the sliding groove 4 is the same as the external air pressure, so that the blocking piece 3 can slide in the sliding groove 4 more smoothly.
Wherein, the second through-hole 5 is provided with two, all is provided with one at 4 length direction both ends of spout.
The wall of the chute 4 is communicated with a third through hole 6, a slide bar 7 is slidably connected in the third through hole 6, the slide bar 7 is connected with the baffle 3, the side wall of the cylinder 1 is connected with an air pump 8, and the air pump 8 is communicated with the third through hole 6. Through the arrangement, an operator controls the air pump 8 to inject air into the third through hole 6, so that the air pressure in the third through hole 6 is increased, the sliding rod 7 is pushed to move upwards, the sliding rod 7 drives the blocking piece 3 to move upwards, and the first through hole 2 can be closed; otherwise, the operator controls the air pump 8 to pump the air in the third through hole 6, so that the air pressure in the third through hole 6 is reduced, the sliding rod 7 moves downwards, the sliding rod 7 drives the blocking piece 3 to move downwards, and the first through hole 2 can be opened.
The size of the baffle plate 3 is larger than that of the first through hole 2. Through the arrangement, the size of the baffle plate 3 is designed to be larger than that of the first through hole 2, so that the baffle plate 3 can shield the first through hole 2 more tightly, and the sealing performance of the sealing device is improved.
The sliding rods 7 and the third through holes 6 are arranged in two, the two sliding rods 7 are connected to two ends of the bottom of the blocking piece 3 respectively, correspondingly, the two third through holes 6 are located at two ends of the bottom wall of the sliding groove 4 respectively, and the two sliding rods 7 cannot block the first through holes 2 when the baffle moves upwards due to the design.
The invention also provides an air path system for the non-contact tonometer, which comprises the air cylinder device and an air injection device connected with the air cylinder device. Through the arrangement, an operator can spray air to human eyes by using the air cylinder device and the air spraying device, so that intraocular pressure is measured.
Air jet system includes air duct 9, gas cavity 10 and air nozzle 11, and air duct 9 and 1 tip intercommunication of cylinder, air duct 9 keep away from cylinder 1's one end and gas cavity 10 intercommunication, air nozzle 11 and gas cavity 10 intercommunication, and air nozzle 11 is used for spraying gas to people's eye. Through the arrangement, the piston moves in the cavity, the air in the cavity is pushed out from the end part of the cylinder 1, and the air enters the air cavity 10 through the air guide pipe 9 and is then sprayed out through the air nozzle 11.
The end of the cylinder 1 is communicated with a connecting pipe 12, and the air duct 9 is inserted into the connecting pipe 12 and is in threaded connection with the connecting pipe 12. Through the arrangement, the air guide pipe 9 is communicated with the cavity of the air cylinder 1 in a mode of being connected with the connecting pipe 12 in a threaded mode, and is convenient to disassemble and high in air tightness.
The air nozzle 11 has a size smaller than that of the first through-hole 2. Through the above arrangement, the size of the air nozzle 11 is designed to be smaller than that of the first through hole 2, so that when the piston moves back, the mist of the tear mist at the air nozzle 11 is not easy to be sucked into the air chamber 10.
And a fourth through hole 13 is formed in the side wall of the cylinder 1, and the fourth through hole 13 is used for controlling the initial position of the piston. With the above arrangement, the compressed gas is discharged out of the chamber through the fourth through hole 13 before the piston passes through the fourth through hole 13, thereby obtaining an effect of changing the initial position of the piston.
The fourth through hole 13 is arc-shaped and is arranged along the circumferential direction of the side wall of the cylinder 1.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A cylinder device for a non-contact tonometer, comprising a cylinder (1) having a chamber and a piston reciprocable in the chamber, characterized in that,
a first through hole (2) which is communicated with the cavity and the outside air is formed in the cylinder (1) at the tail end of the motion stroke of the piston;
the sealing device is arranged on the cylinder (1) and is suitable for closing or opening the first through hole (2), when the cylinder (1) performs air injection, the piston starts to start, meanwhile, the first through hole (2) in the cylinder (1) is in a closed state, after the piston reaches a preset position, the sealing device opens the first through hole (2), and when the piston returns to an initial position, the first through hole (2) is always in an open state;
the sealing device comprises a blocking piece (3), a sliding groove (4) is formed in the wall of the end portion of the air cylinder (1), the first through hole (2) penetrates through the sliding groove (4), the blocking piece (3) is located in the sliding groove (4) and is in sliding fit with the sliding groove (4), and the blocking piece (3) is used for blocking the first through hole (2);
a second through hole (5) is communicated with the wall of the sliding groove (4), and one end, far away from the sliding groove (4), of the second through hole (5) is communicated with the outside;
a third through hole (6) is communicated with the groove wall of the sliding groove (4), a sliding rod (7) is connected in the third through hole (6) in a sliding manner, the sliding rod (7) is connected with the blocking piece (3), an air pump (8) is connected to the side wall of the air cylinder (1), and the air pump (8) is communicated with the third through hole (6);
an operator controls the air pump (8) to inject air into the third through hole (6), so that the air pressure in the third through hole (6) is increased, the sliding rod (7) is pushed to move upwards, the sliding rod (7) drives the blocking piece (3) to move upwards, and the first through hole (2) can be closed; otherwise, the operator controls the air pump (8) to pump air in the third through hole (6), so that the air pressure in the third through hole (6) is reduced, the sliding rod (7) moves downwards, and the sliding rod (7) drives the blocking piece (3) to move downwards, so that the first through hole (2) can be opened.
2. Cylinder device for non-contact tonometer according to claim 1, characterized in that the size of said flap (3) is greater than the size of said first through hole (2).
3. An air circuit system for a non-contact tonometer, comprising a cylinder device according to any of claims 1-2 and an air injector connected to said cylinder device.
4. An air circuit system for a non-contact tonometer according to claim 3, characterized in that the air injection device comprises an air duct (9), an air chamber (10) and an air nozzle (11), the air duct (9) is communicated with the end of the air cylinder (1), one end of the air duct (9) far away from the air cylinder (1) is communicated with the air chamber (10), the air nozzle (11) is communicated with the air chamber (10), and the air nozzle (11) is used for injecting air to human eyes.
5. Air circuit system for non-contact tonometer according to claim 4, characterized in that the end of the air cylinder (1) is connected with a connecting tube (12), the air duct (9) is inserted into the connecting tube (12) and is screwed with the connecting tube (12).
6. An air circuit system for a non-contact tonometer as claimed in claim 4, characterized in that the air nozzle (11) has a smaller size than the first through hole (2).
7. An air passage system for a non-contact tonometer as claimed in claim 3, characterized in that a fourth through hole (13) is provided on the side wall of the cylinder (1), said fourth through hole (13) being used for controlling the initial position of the piston.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111211929.5A CN113907702B (en) | 2021-10-18 | 2021-10-18 | Air cylinder device and air path system for non-contact tonometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111211929.5A CN113907702B (en) | 2021-10-18 | 2021-10-18 | Air cylinder device and air path system for non-contact tonometer |
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| CN113907702A CN113907702A (en) | 2022-01-11 |
| CN113907702B true CN113907702B (en) | 2022-07-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273883A (en) * | 2007-03-27 | 2008-10-01 | 株式会社拓普康 | Air pulse discharging device for noncontact type tonometer |
| CN103479329A (en) * | 2012-06-08 | 2014-01-01 | 佳能株式会社 | Contactless tonometer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014209982A (en) * | 2013-04-17 | 2014-11-13 | キヤノン株式会社 | Non-contact tonometer |
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2021
- 2021-10-18 CN CN202111211929.5A patent/CN113907702B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273883A (en) * | 2007-03-27 | 2008-10-01 | 株式会社拓普康 | Air pulse discharging device for noncontact type tonometer |
| CN103479329A (en) * | 2012-06-08 | 2014-01-01 | 佳能株式会社 | Contactless tonometer |
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