Multi-gear gas injection device for non-contact tonometer

Abstract

The utility model relates to the technical field of tonometer, in particular to a multi-gear gas injection device for a non-contact tonometer, which mainly solves the technical problem that the existing non-contact tonometer has fewer gears for measuring results. The first support and the second support are fixed to the bottom plate, the cylinder body is fixed to the top end of the first support, the piston is connected into the cylinder body, the electric telescopic push rod is fixed to the top end of the second support and connected with the piston, and the rotating speed adjusting piece is connected with the electric telescopic push rod. According to the gas injection device, the rotation speed of the motor of the electric telescopic push rod is adjusted through the rotation speed adjusting piece to achieve gear adjustment of injection gas pressure, three or more gears can be designed more easily, and the requirements of different patients can be met.

Description

Technical Field

[0001] This utility model relates to the field of tonometer technology, and in particular to a multi-level gas jet device for non-contact tonometers. Background Technology

[0002] Tonometers are now widely used to measure intraocular pressure in the human eye. Measuring intraocular pressure provides a reference for the diagnosis and treatment of glaucoma and related eye diseases. Among them, non-contact tonometers are gaining increasing attention and usage due to their advantages such as comfort and no risk of cross-infection. Non-contact tonometers generally use the movement of a piston to generate compressed air. This compressed air enters the air chamber through an air tube and is then sprayed onto the cornea through a specific nozzle, flattening the cornea and thus measuring intraocular pressure.

[0003] Most existing non-contact tonometers use a rotating electromagnet as a power source, which drives a piston through a crank-slider mechanism to generate compressed air. However, this structure only has two injection pressure settings, high and low, covering intraocular pressure from 0 to 60 mmHg. The range of intraocular pressure measurement for each setting is relatively large, making it difficult to meet the needs of different patients. Utility Model Content

[0004] To overcome the technical deficiency of existing non-contact tonometers having a limited number of speed settings, this invention provides a multi-speed gas jet device for non-contact tonometers.

[0005] The multi-level gas jet device for non-contact tonometers provided by this utility model includes:

[0006] The base plate is arranged horizontally.

[0007] The first bracket is fixed to the base plate;

[0008] A cylinder body, which is fixed to the top of the first bracket and arranged horizontally along its axis, has an injection port at the front end of the cylinder body;

[0009] A piston is connected to the cylinder body, and in the initial state, the piston is located at the rear end of the cylinder body;

[0010] The second bracket is fixed to the base plate;

[0011] An electric telescopic push rod, the housing of which is fixed to the top of the second bracket and coaxial with the cylinder body, the telescopic end of which is connected to the piston to drive the piston to reciprocate;

[0012] A speed adjustment component is connected to the electric telescopic push rod. The speed adjustment component is used to adjust the motor speed of the electric telescopic push rod and has at least three speed settings.

[0013] Optionally, the cylinder body has an air volume hole on its side wall, and in the initial state, the air volume hole is located in front of the piston.

[0014] Optionally, the first bracket includes a fixing column and a fixing plate. The top end of the fixing column is connected to the lower front end of the cylinder body. The fixing plate is arranged vertically and has a mounting hole at the top. The rear end of the cylinder body is inserted into the mounting hole.

[0015] Optionally, the mounting hole is provided with an internal thread, and the rear end of the cylinder body is provided with an external thread, and the rear end of the cylinder body is screwed into the mounting hole.

[0016] Optionally, the electric telescopic push rod includes a rotary motor, the output shaft of which is driven by a reducer, the output shaft of which is connected to a reciprocating screw, the reciprocating screw being coaxial with the cylinder body, a nut being fitted on the reciprocating screw, the nut being fixedly connected to the piston, and a guide structure being provided between the nut and the housing of the rotary motor to allow only axial movement of the nut.

[0017] Optionally, it also includes an on / off control and a distance sensor. The on / off control is connected to the electric telescopic push rod, and the distance sensor is mounted on the housing of the electric telescopic push rod and used to detect the distance between it and the piston. The on / off control is used to control the electric telescopic push rod to start after activation and to control the electric telescopic push rod to close when it receives the minimum distance signal emitted by the distance sensor.

[0018] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0019] The multi-level gas injection device for non-contact tonometers provided by this utility model uses an electric telescopic push rod to drive the piston to reciprocate, thereby realizing the injection of compressed air and the return of the piston. The injection air pressure level can be adjusted by adjusting the motor speed of the electric telescopic push rod through the speed adjustment component. The levels can be designed to be three or more, which can meet the needs of different patients. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the gas injection device in an embodiment of the present invention.

[0023] In the picture:

[0024] 1. Base plate; 2. Cylinder block; 3. Injection port; 4. Piston; 5. Second bracket; 6. Electric telescopic push rod; 7. Air volume orifice; 8. Fixing column; 9. Fixing plate; 10. Distance sensor. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0027] The following is combined with Figure 1 The specific embodiments of this utility model will be described in detail below.

[0028] This embodiment provides a multi-level gas injection device for a non-contact tonometer, including a base plate 1, a first bracket, a cylinder 2, a piston 4, a second bracket 5, an electric telescopic push rod 6, and a speed adjustment component.

[0029] The base plate 1 is arranged horizontally.

[0030] As is easy to understand, the base plate 1 is mainly used to provide hardware support for other components and to connect other components to form an overall structure.

[0031] The first bracket is fixed on the base plate 1.

[0032] The cylinder body 2 is fixed to the top of the first bracket and its axis is arranged horizontally. The front end of the cylinder body 2 is provided with an injection port 3.

[0033] Specifically, the first support includes a fixing column 8 and a fixing plate 9. The top of the fixing column 8 is connected to the lower front end of the cylinder body 2. The fixing plate 9 is vertically arranged and has a mounting hole at its top. The rear end of the cylinder body 2 is inserted into the mounting hole. By supporting both ends of the cylinder body 2 with the fixing column 8 and the fixing plate 9 respectively, the stability of the cylinder body 2 is enhanced.

[0034] More specifically, the mounting hole has internal threads, and the rear end of the cylinder body 2 has external threads. The rear end of the cylinder body 2 is screwed into the mounting hole. The threaded connection between the cylinder body 2 and the fixing plate 9 enhances the fixing effect.

[0035] More specifically, the bottom end of the fixing column 8 is connected to the base plate 1 by bolts or other detachable means, which facilitates maintenance and replacement.

[0036] Furthermore, the cylinder 2 has an air volume hole 7 on its side wall, and in the initial state, the air volume hole 7 is located in front of the piston 4. When the piston 4 is behind the air volume hole 7, air can still overflow from the air volume hole 7 as the piston 4 moves forward. Air compression only begins when the piston 4 blocks the air volume hole 7. Therefore, the air volume hole 7 can ensure that the volume pushed out by the piston 4 is equal each time.

[0037] The piston 4 is connected inside the cylinder 2, and in the initial state, the piston 4 is located at the rear end of the cylinder 2.

[0038] Specifically, piston 4 has a stepped shaft structure, with the large-diameter section located on the front and slidably sealed inside cylinder 2, and the small-diameter section located on the rear and connected to the telescopic end of electric telescopic push rod 6.

[0039] The second bracket 5 is fixed on the base plate 1.

[0040] Specifically, the bottom of the second bracket 5 is connected to the base plate 1 by bolts or other detachable means, which facilitates maintenance and replacement.

[0041] The housing of the electric telescopic push rod 6 is fixed to the top of the second bracket 5 and is coaxial with the cylinder 2. The telescopic end of the electric telescopic push rod 6 is connected to the piston 4 to drive the piston 4 to reciprocate.

[0042] As is easily understood, the electric telescopic push rod 6 includes a rotary motor, whose output shaft is driven by a reducer. The reducer's output shaft is connected to a reciprocating screw, which is coaxial with the cylinder 2. A nut is fitted onto the reciprocating screw and is fixedly connected to the piston 4. A guide structure is provided between the nut and the rotary motor housing, allowing only axial movement of the nut. During operation, the rotary motor's output shaft rotates, driving the reducer's output shaft to rotate, which in turn drives the reciprocating screw to rotate, thereby causing the nut to move axially back and forth, ultimately achieving the reciprocating motion of the piston 4.

[0043] It is important to note that a reciprocating lead screw is a lead screw with two threaded grooves on its surface that have opposite directions of rotation. The rotary motor only needs to rotate in one direction to realize the reciprocating motion of the nut, without the need for the rotary motor to reverse the direction.

[0044] Specifically, the guide structure can adopt a structure commonly used in this field. For example, a cylinder is fixed on the housing of a rotary motor. A guide groove is provided on the side wall of the cylinder, and the reciprocating screw and nut are placed inside the cylinder. A slider is fixed on the nut and placed in the guide groove. The slider is fixedly connected to the piston 4. The nut is guided by the cooperation between the slider and the guide groove.

[0045] The speed adjustment component is connected to the electric telescopic push rod 6. The speed adjustment component is used to adjust the motor speed of the electric telescopic push rod 6 and has at least three speed settings.

[0046] It is easy to understand that motor speed control is a mature technology in this field. For example, in this embodiment, the speed control device uses PWM control to control the motor speed.

[0047] Specifically, the speed adjustment component includes an adjustment knob with three settings: 25 mmHg, 45 mmHg, and 65 mmHg, which can accommodate patients with different intraocular pressure requirements.

[0048] Furthermore, the multi-stage gas injection device in this embodiment also includes an on / off control component and a distance sensor 10. The on / off control component is connected to the electric telescopic push rod 6, and the distance sensor 10 is mounted on the housing of the electric telescopic push rod 6 to detect the distance between it and the piston 4. The on / off control component is used to control the electric telescopic push rod 6 to start after activation and to control the electric telescopic push rod 6 to close when it receives the minimum distance signal from the distance sensor 10. When the on / off control component is activated, the electric telescopic push rod 6 starts, controlling the piston 4 to move and complete the injection. Then, the piston 4 returns to its original position under the action of the electric telescopic push rod 6. During the resetting process, the distance between the piston 4 and the distance sensor 10 becomes smaller and smaller. When the distance reaches the preset minimum distance, the on / off control component controls the electric telescopic push rod 6 to close. This ensures that the piston 4 can reciprocate once within one on / off cycle, achieving the purpose of periodically and stably injecting gas.

[0049] It should be noted that the switching control unit needs to be used in conjunction with a microcontroller or other controller and corresponding algorithms to complete the control action. These are all mature technologies in this field, and will not be elaborated here.

[0050] The working principle of the multi-level gas jet device for non-contact tonometer in this embodiment is as follows:

[0051] S1. Activate the speed adjustment device and adjust the adjustment knob to the appropriate position. At this time, the piston 4 is located behind the air volume orifice 7.

[0052] S2. The on / off control component is activated, the electric telescopic push rod 6 is started, the rotary motor drives the reciprocating screw to rotate, the reciprocating screw drives the piston 4 to reciprocate, and reciprocates once according to the speed adjustment gear. At the same time, the injection port 3 emits a stable and precise airflow to the outside.

[0053] The above are merely specific embodiments of this utility model, enabling those skilled in the art to understand or implement this utility model. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A multi-stage gas injection device for a non-contact tonometer, characterized in that, include: The base plate (1) is arranged horizontally; The first bracket is fixed to the base plate (1); The cylinder (2) is fixed to the top of the first bracket and its axis is arranged horizontally. The front end of the cylinder (2) is provided with an injection port (3). A piston (4) is connected inside the cylinder (2), and in the initial state, the piston (4) is located at the rear end of the cylinder (2); The second bracket (5) is fixed on the base plate (1); The electric telescopic push rod (6) has its housing fixed to the top of the second bracket (5) and coaxial with the cylinder (2). The telescopic end of the electric telescopic push rod (6) is connected to the piston (4) to drive the piston (4) to reciprocate. A speed adjustment component is connected to the electric telescopic push rod (6). The speed adjustment component is used to adjust the motor speed of the electric telescopic push rod (6) and has at least three speed settings.

2. The multi-stage gas jet device for a non-contact tonometer according to claim 1, characterized in that, The cylinder (2) has an air volume hole (7) on its side wall, and in the initial state, the air volume hole (7) is located in front of the piston (4).

3. The multi-stage gas jet device for a non-contact tonometer according to claim 1, characterized in that, The first bracket includes a fixed column (8) and a fixed plate (9). The top end of the fixed column (8) is connected to the lower front end of the cylinder (2). The fixed plate (9) is arranged vertically and has a mounting hole at the top. The rear end of the cylinder (2) is inserted into the mounting hole.

4. The multi-stage gas jet device for a non-contact tonometer according to claim 3, characterized in that, The mounting hole is provided with an internal thread, and the rear end of the cylinder (2) is provided with an external thread. The rear end of the cylinder (2) is screwed into the mounting hole.

5. The multi-stage gas jet device for a non-contact tonometer according to claim 1, characterized in that, The electric telescopic push rod (6) includes a rotary motor, the output shaft of which is connected to a reducer, the output shaft of which is connected to a reciprocating screw, the reciprocating screw being coaxial with the cylinder (2), a nut being fitted on the reciprocating screw, the nut being fixedly connected to the piston (4), and a guide structure being provided between the nut and the housing of the rotary motor that only allows the nut to move axially.

6. The multi-stage gas jet device for a non-contact tonometer according to any one of claims 1 to 5, characterized in that, It also includes an on / off control and a distance sensor (10). The on / off control is connected to the electric telescopic push rod (6). The distance sensor (10) is mounted on the housing of the electric telescopic push rod (6) and is used to detect the distance between it and the piston (4). The on / off control is used to control the electric telescopic push rod (6) to start after startup and to control the electric telescopic push rod (6) to close when it receives the minimum distance signal emitted by the distance sensor (10).

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