Intraocular pressure simulation device

Abstract

The invention discloses an intraocular pressure simulation device. The intraocular pressure simulation device comprises a flow adjusting structure, a liquid containing structure, a cornea containing structure and a controller. The liquid containing structure comprises a box body, a first cavity and a second cavity, the first cavity and the second cavity are defined by the box body, the first cavity and the second cavity are mutually independent, two pressure cavities with different pressures are formed, and the second cavity is used for containing aqueous humor simulation liquid. The first cavity and the second cavity are both communicated with the flow adjusting structure. The controller is connected with the flow adjusting structure, the liquid containing structure and the cornea containing structure so that operation of all the structures can be controlled through the controller, intraocular pressure can be controlled through computer software, and use and remote control of a user are facilitated. The cornea accommodating structure comprises a third chamber, the third chamber is used for accommodating the biological cornea and is communicated with the first chamber, and the third chamber is controlled by the controller, so that the aqueous humor simulation liquid enters the anterior chamber of the biological cornea in the third chamber, and the intraocular pressure of the biological cornea with the aqueous humor simulation liquid is close to a real intraocular pressure value.

Description

Technical Field

[0001] The present application relates to the field of medical technology, and in particular to an intraocular pressure simulation device. Background Art

[0002] Intraocular pressure is an important indicator of eye health. Excessive intraocular pressure can cause lens opacity and iris atrophy. Severe cases of high intraocular pressure may lead to blindness. Under normal circumstances, the production and excretion of aqueous humor maintain a dynamic balance, that is, within a certain period of time, the amount of aqueous humor produced and discharged is equal. If the drainage channel of aqueous humor is blocked, or the amount of aqueous humor produced increases for some reason, it can lead to the accumulation of aqueous humor and increase intraocular pressure. If the amount of aqueous humor produced is too little, the accumulation of aqueous humor does not reach a certain amount, and the intraocular pressure will be too low. However, the devices currently on the market are difficult to intuitively display and simulate intraocular pressure, and the accuracy is not high. Summary of the invention

[0003] An embodiment of the present application provides an intraocular pressure simulation device, which aims to provide a biological cornea that is close to the actual intraocular pressure value.

[0004] The first aspect of the present application provides an intraocular pressure simulation device, which includes: a flow regulating structure; a liquid containing structure, including a box body and a first chamber formed by the box body and independent of each other, and a second chamber for containing aqueous humor simulated liquid, the first chamber and the second chamber are both connected to the flow regulating structure, so that the aqueous humor simulated liquid in the second chamber can flow into the first chamber through the flow regulating structure; a cornea containing structure, having a third chamber for containing a biological cornea and connected to the first chamber; a controller, the controller is connected to the flow regulating structure, the liquid containing structure and the cornea containing structure, so as to control the aqueous humor simulated liquid in the second chamber to flow through the flow regulating structure through the first chamber and flow into the anterior chamber of the biological cornea.

[0005] According to the implementation scheme of the first aspect of the present application, the flow regulating structure includes a flow pump, the flow pump has a liquid inlet and a liquid outlet, the liquid outlet is connected to the first chamber, and the liquid inlet is connected to the second chamber.

[0006] According to any of the aforementioned embodiments of the first aspect of the present application, the first chamber is arranged in the second chamber.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the liquid containing structure includes a pressure relief channel and a pressure channel arranged on the outer surface of the box body, and the flow regulating structure includes a pressure relief interface and a pressure interface, one end of the pressure relief channel is connected to the second chamber, and the other end is connected to the pressure relief interface, and one end of the pressure relief channel is connected to the first chamber, and the other end is connected to the pressure relief interface.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the liquid containing structure also includes an output pressure interface located on the outer surface of the box body and connected to the first chamber, and the cornea containing structure includes an input pressure interface, and the output pressure interface is connected to the input pressure interface.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the corneal accommodation structure also includes: a needle ejector block, one end of the input pressure interface is connected to the output pressure interface, and the other end is detachably connected to the needle ejector block, and the needle ejector block is communicated with the input pressure interface; a Luer needle, the Luer needle is communicated with the needle ejector block and includes a base and a needle head fixed to the base, the base is detachably connected to one end of the needle ejector block away from the input pressure interface, and the third chamber is located at the end of the Luer needle away from the needle ejector block.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the controller includes a pressure sensor, the pressure sensor is connected to the first chamber, the liquid containing structure includes a pressure calibration interface connected to the first chamber, and the pressure calibration interface is used to install a pressure gauge.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the liquid containing structure further includes a pressure relief valve disposed on the outer surface of the box body, and the pressure relief valve is connected to the second chamber.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, it also includes: a base, the base has a receiving groove, the liquid receiving structure is arranged in the receiving groove, and a sliding groove is opened at the bottom of the base; a slider, the base is arranged on the slider and is slidably connected to the slider.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, it also includes: a compensation motor; a telescopic rod, one end of the telescopic rod is connected to the base, and the other end is connected to the compensation motor.

[0014] According to the intraocular pressure simulation device of the embodiment of the present application, the intraocular pressure simulation device includes a flow regulating structure, a liquid containing structure, a cornea containing structure and a controller. The liquid containing structure includes a box body and a first chamber and a second chamber formed by the box body. The first chamber and the second chamber are independent of each other to form two pressure chambers with different pressures. The second chamber is used to contain aqueous humor simulation liquid, and the first chamber is used to connect the cornea containing structure and input the aqueous humor simulation liquid into the cornea containing structure. The first chamber and the second chamber are both connected to the flow regulating structure, so that the aqueous humor simulation liquid in the second chamber can enter the flow regulating structure and be input into the first chamber after the flow regulating structure adjusts the flow rate. The controller is connected to the flow regulating structure, the liquid containing structure and the cornea containing structure to control the operation of each structure through the controller, so as to realize computer software control of intraocular pressure, which is convenient for users to use and remote control. The cornea containing structure includes a third chamber, the third chamber is used to contain the biological cornea and is connected to the first chamber. Through the control of the controller, the aqueous humor simulation liquid enters the anterior chamber of the biological cornea in the third chamber, and the intraocular pressure of the biological cornea with aqueous humor simulation liquid is close to the real intraocular pressure value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0016] Figure 1 is a structural schematic diagram of an intraocular pressure simulation device provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 Exploded view of the intraocular pressure simulation device;

[0018] Figure 3 is an exploded view of a corneal accommodation structure provided in an embodiment of the present application;

[0019] Figure 4 is a partial cross-sectional view of a cornea accommodation structure provided in an embodiment of the present application;

[0020] Figure 5 is a schematic structural diagram of an intraocular pressure simulation device in another embodiment;

[0021] Figure 6 is a schematic structural diagram of an intraocular pressure simulation device in yet another embodiment.

[0022] Description of reference numerals:

[0023] 10. Intraocular pressure simulation device;

[0024] 100, flow regulating structure; 110, pressurizing interface; 120, pressure relief interface;

[0025] 200, liquid containing structure; 210, first chamber; 211, pressurizing channel; 220, second chamber; 221, pressure relief channel; 230, box; 240, output pressure interface; 250, pressure calibration interface; 260, pressure relief valve;

[0026] 300, cornea accommodating structure; 310, third chamber; 320, input pressure interface; 330, needle top block; 340, Luer needle; 341, base; 342, needle;

[0027] 400, controller; 410, pressure sensor;

[0028] 500, base; 510, slide groove; 520, sealing gasket;

[0029] 600, slider;

[0030] 700, compensation motor;

[0031] 800. Telescopic rod. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0034] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0035] An embodiment of the present application provides an intraocular pressure simulation device, and various embodiments of the intraocular pressure simulation device will be described below in conjunction with the accompanying drawings.

[0036] See also Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of an intraocular pressure simulation device provided in an embodiment of the present application; Figure 2 yes Figure 1 Exploded view of the intraocular pressure simulation device.

[0037] like Figure 1 and Figure 2 As shown, the first embodiment of the present application provides an intraocular pressure simulation device 10, which includes a flow regulating structure 100, a liquid containing structure 200, a cornea containing structure 300 and a controller 400; the liquid containing structure 200 includes a box body 230 and a first chamber 210 and a second chamber 220 for containing aqueous humor simulation liquid, which are enclosed by the box body 230 and are independent of each other. The first chamber 210 and the second chamber 220 are both connected to the flow regulating structure 100, so that the aqueous humor simulation liquid in the second chamber 220 can flow into the first chamber 210 through the flow regulating structure 100; the cornea containing structure 300 has a third chamber 310 for accommodating a biological cornea and is connected to the first chamber 210; the controller 400 is connected to the flow regulating structure 100, the liquid containing structure 200 and the cornea containing structure 300, so as to control the aqueous humor simulation liquid in the second chamber 220 to flow through the first chamber 210 through the flow regulating structure 100 and flow into the anterior chamber of the biological cornea.

[0038] According to the intraocular pressure simulation device 10 of the embodiment of the present application, the intraocular pressure simulation device 10 includes a flow regulating structure 100, a liquid containing structure 200, a cornea containing structure 300 and a controller 400. The liquid containing structure 200 includes a box body 230 and a first chamber 210 and a second chamber 220 formed by the box body 230. The first chamber 210 and the second chamber 220 are independent of each other, forming two pressure chambers with different pressures. The second chamber 220 is used to contain aqueous humor simulation liquid, and the first chamber 210 is used to connect the cornea containing structure 300 and input the aqueous humor simulation liquid into the cornea containing structure 300. The first chamber 210 and the second chamber 220 are both connected to the flow regulating structure 100, so that the aqueous humor simulation liquid in the second chamber 220 can enter the flow regulating structure 100 and be input into the first chamber 210 after the flow rate is adjusted by the flow regulating structure 100. The controller 400 is connected to the flow regulating structure 100, the liquid containing structure 200 and the cornea containing structure 300, so that the operation of each structure can be controlled by the controller 400, and the intraocular pressure can be controlled by computer software, which is convenient for users to use and remotely control. The cornea containing structure 300 includes a third chamber 310, which is used to contain the biological cornea and is connected to the first chamber 210. The controller 400 controls the aqueous humor simulated liquid to enter the anterior chamber of the biological cornea in the third chamber 310, and the intraocular pressure of the biological cornea with the aqueous humor simulated liquid is close to the real intraocular pressure value.

[0039] Optionally, the aqueous humor simulation fluid includes a 1:1 mixture of physiological saline and ascorbic acid hydrogen peroxide to ensure the freshness of the biological cornea.

[0040] Optionally, the controller 400 adopts a metal sealed structure to reduce electromagnetic interference and crosstalk signals.

[0041] Optionally, the biological cornea includes a pig cornea or a polydimethylsiloxane (PDMS) membrane.

[0042] In some optional embodiments, the flow regulating structure 100 includes a flow pump having a liquid inlet and a liquid outlet, wherein the liquid outlet is connected to the first chamber 210 and the liquid inlet is connected to the second chamber 220 .

[0043] In these optional embodiments, the flow pump is used to adjust the liquid flow rate, and the liquid inlet of the flow pump is connected to the second chamber 220, so that the aqueous humor simulated liquid in the second chamber 220 can enter the flow pump through the liquid inlet, and then after the flow rate is adjusted, the aqueous humor simulated liquid enters the first chamber 210 connected to the liquid outlet through the liquid outlet.

[0044] Optionally, the flow pump flow rate includes 3μl / min, and the flow rate of 3μl / min meets normal aqueous humor production and provides precise pressure control for simulating intraocular pressure.

[0045] Optionally, the flow pump includes a micro flow pump to provide precise pressure control for simulating intraocular pressure.

[0046] In some optional embodiments, the first chamber 210 is nested in the second chamber 220 .

[0047] In these optional embodiments, the first chamber 210 is nested in the second chamber 220, which means that the second chamber 220 is arranged around the first chamber 210, and the two are nested with each other, so that the first chamber 210 is located in the second chamber 220 and the first chamber 210 and the second chamber 220 are independent of each other and have different pressures.

[0048] like Figure 3 As shown, in some optional embodiments, the liquid containing structure 200 includes a pressure relief channel 221 and a pressurization channel 211 arranged on the outer surface of the box body 230, and the flow regulating structure 100 includes a pressure relief interface 120 and a pressurization interface 110, one end of the pressure relief channel 221 is connected to the second chamber 220, and the other end is connected to the pressure relief interface 120, and one end of the pressurization channel 211 is connected to the first chamber 210, and the other end is connected to the pressurization interface 110.

[0049] In these optional embodiments, the pressure relief channel 221 connects the pressure relief interface 120 of the flow regulating structure 100 with the second chamber 220, so that the aqueous humor simulation fluid in the second chamber 220 can enter the pressure relief interface 120 through the pressure relief channel 221 and the flow rate is regulated by the flow regulating structure 100. The pressurization channel 211 connects the pressurization interface 110 of the flow regulating structure 100 with the first chamber 210, so that the pressurized aqueous humor simulation fluid can flow through the pressurization channel 211 through the pressurization interface 110 and enter the first chamber 210, and then enter the biological corneal anterior chamber of the third chamber 310 through the first chamber 210 to provide a biological cornea close to the real intraocular pressure.

[0050] In some optional embodiments, the liquid containing structure 200 also includes an output pressure interface 240 located on the outer surface of the box body 230 and connected to the first chamber 210, and the cornea containing structure 300 includes an input pressure interface 320, and the output pressure interface 240 is connected to the input pressure interface 320.

[0051] In these optional embodiments, the first chamber 210 is connected to the input pressure interface 320 of the corneal accommodating structure 300 via the output pressure interface 240, so that the pressurized aqueous humor simulated fluid can enter the corneal accommodating structure 300 through the first chamber 210, that is, enter the biological corneal anterior chamber of the third chamber 310, so as to provide a biological cornea with a pressure close to the real intraocular pressure.

[0052] like Figure 2As shown, in some optional embodiments, the controller 400 includes a pressure sensor 410, which is connected to the first chamber 210, and the liquid containing structure 200 includes a pressure calibration interface 250 connected to the first chamber 210, and the pressure calibration interface 250 is used to install a pressure gauge.

[0053] In these optional embodiments, the pressure sensor 410 of the controller 400 is connected to the first chamber 210 to monitor the pressure in the first chamber 210. The liquid containing structure 200 is provided with a pressure calibration interface 250 connected to the first chamber 210, and the pressure calibration interface 250 is used to connect an external pressure gauge to calibrate the pressure sensor 410 through the external pressure gauge, so that the computer software can control the intraocular pressure, which is convenient for users to use and remote control. The pressure gauge can be a high-precision pressure gauge such as a YB-1 pressure gauge, which can calibrate the pressure in the first chamber 210 with high precision to control the pressure range of the first chamber 210 to be 0 to 120 mmgh.

[0054] Please also read Figure 3 and Figure 4 , Figure 3 is an exploded view of a corneal accommodation structure provided in an embodiment of the present application; Figure 4 It is a partial cross-sectional view of a corneal accommodation structure provided in an embodiment of the present application.

[0055] like Figure 3 and Figure 4 As shown, in some optional embodiments, the cornea accommodating structure 300 further includes a needle top block 330 and a Luer needle 340. One end of the input pressure interface 320 is connected to the output pressure interface 240, and the other end is detachably connected to the needle top block 330, and the needle top block 330 is connected to the input pressure interface 320; the Luer needle 340 is connected to the needle top block 330, and includes a base 341 and a needle head 342 fixed to the base 341, and the base 341 is detachably connected to one end of the needle top block 330 away from the input pressure interface 320, and the third chamber 310 is located at one end of the Luer needle 340 away from the needle top block 330.

[0056] In these optional embodiments, the input pressure interface 320 connects the output pressure interface 240 with the needle top block 330, and the aqueous humor simulation fluid enters the cornea accommodation structure 300 through the input pressure interface 320, and flows through the needle top block 330 and the Luer needle 340 in sequence, and the needle head 342 of the Luer needle 340 can directly penetrate the anterior chamber of the biological cornea located in the third chamber 310. The injection integrated pressure is directly formed through the input pressure interface 320, and the aqueous humor simulation fluid is injected into the anterior chamber of the biological cornea through the Luer needle 340, simulating the ciliary muscle to produce aqueous humor flowing into the anterior chamber, so that the intraocular pressure of the biological cornea is close to the real intraocular pressure.

[0057] See also Figure 5, Figure 5 Schematic diagram of the structure of an intraocular pressure simulation device in another embodiment.

[0058] like Figure 5 As shown, in some optional embodiments, the liquid containing structure 200 further includes a pressure relief valve 260 disposed on the outer surface of the box body 230 , and the pressure relief valve 260 is connected to the second chamber 220 .

[0059] In these optional embodiments, the second chamber 220 is connected to a pressure relief valve 260 to prevent negative pressure from forming in the second chamber 220 and affecting the flow rate of the flow regulating structure 100, thereby ensuring that the flow regulating structure 100 can normally regulate the flow rate of the aqueous humor simulated fluid.

[0060] Optionally, there are multiple pressure relief valves 260, and the multiple pressure relief valves 260 are distributed at intervals on the outer surface of the box body 230 to improve the pressure relief efficiency.

[0061] See also Figure 6 , Figure 6 is a schematic structural diagram of an intraocular pressure simulation device in yet another embodiment.

[0062] like Figure 6 As shown, in some optional embodiments, the intraocular pressure simulation device 10 also includes a base 500 and a slider 600, the base 500 has a receiving groove, the liquid receiving structure 200 is arranged in the receiving groove, and a slide groove 510 is opened at the bottom of the base 500; the base 500 is arranged on the slider 600 and is slidably connected to the slider 600.

[0063] In these optional embodiments, the base 500 is provided with a receiving groove to set the liquid containing structure 200, which can not only carry the liquid containing structure 200, but also protect the liquid containing structure 200. The bottom of the base 500 refers to the side of the base 500 away from the receiving groove. The base 500 is provided with a slide groove 510 so that the slide groove 510 can slide on the slider 600. When the intraocular pressure increases, the eyeball will protrude significantly. At this time, the liquid containing structure 200 can be slid to correct the error of the increased intraocular pressure and ensure the accuracy of the intraocular pressure.

[0064] Optionally, a sealing gasket 520 is provided between the base 500 and the liquid containing structure 200 to ensure the sealing of the liquid containing structure 200 and prevent liquid leakage.

[0065] In some optional embodiments, the intraocular pressure simulation device 10 further includes a compensation motor 700 and a telescopic rod 800 ; one end of the telescopic rod 800 is connected to the base 500 , and the other end is connected to the compensation motor 700 .

[0066] In these optional embodiments, the telescopic rod 800 connects the compensation motor 700 to the base 500. When the intraocular pressure increases, the liquid containing structure 200 slides on the slider 600 through the telescopic rod 800 to correct the error of the increased intraocular pressure and ensure the accuracy of the intraocular pressure. The compensation motor 700 can more accurately control the displacement of the telescopic rod 800, improve the accuracy of the displacement, and ensure the effect of error correction. For example, when the intraocular pressure increases, the eyeball protrudes by about 2 mm, and the telescopic rod 800 makes a 2 mm correction.

[0067] Therefore, the bio-corneal intraocular pressure provided by the intraocular pressure simulation device 10 of the present application is close to the real intraocular pressure, which meets the actual needs.

[0068] According to the embodiments described above in the present application, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. An intraocular pressure simulation device, characterized in that: The intraocular pressure simulation device comprises: Flow regulation structure; The liquid containing structure comprises a box body, a first chamber enclosed by the box body and formed independently of each other, and a second chamber for containing aqueous humor simulated liquid, wherein the first chamber and the second chamber are both connected to the flow regulating structure, so that the aqueous humor simulated liquid in the second chamber can flow into the first chamber through the flow regulating structure; A cornea accommodating structure having a third chamber for accommodating a biological cornea and communicating with the first chamber; A controller is connected to the flow regulating structure, the liquid containing structure and the cornea containing structure to control the aqueous humor simulation liquid in the second chamber to flow through the flow regulating structure through the first chamber and into the anterior chamber of the biological cornea.

2. The intraocular pressure simulation device according to claim 1, characterized in that: The flow regulating structure comprises a flow pump, wherein the flow pump has a liquid inlet and a liquid outlet, wherein the liquid outlet is connected to the first chamber, and the liquid inlet is connected to the second chamber.

3. The intraocular pressure simulation device according to claim 1, characterized in that: The first chamber is sleeved in the second chamber.

4. The intraocular pressure simulation device according to claim 1, characterized in that: The liquid containing structure includes a pressure relief channel and a pressure channel arranged on the outer surface of the box body, and the flow regulating structure includes a pressure relief interface and a pressure interface. One end of the pressure relief channel is connected to the second chamber, and the other end is connected to the pressure relief interface. One end of the pressure channel is connected to the first chamber, and the other end is connected to the pressure interface.

5. The intraocular pressure simulation device according to claim 1, characterized in that: The liquid containing structure also includes an output pressure interface located on the outer surface of the box body and connected to the first chamber, and the cornea containing structure includes an input pressure interface, and the output pressure interface is connected to the input pressure interface.

6. The intraocular pressure simulation device according to claim 5, characterized in that: The cornea accommodating structure further comprises: A needle ejector block, wherein one end of the input pressure interface is connected to the output pressure interface, and the other end is detachably connected to the needle ejector block, and the needle ejector block is connected to the input pressure interface; A Luer needle is connected to the needle ejection block and comprises a base and a needle head fixed to the base, the base is detachably connected to an end of the needle ejection block away from the input pressure interface, and the third chamber is located at an end of the Luer needle away from the needle ejection block.

7. The intraocular pressure simulation device according to claim 1, characterized in that: The controller includes a pressure sensor connected to the first chamber. The liquid containing structure includes a pressure calibration interface connected to the first chamber, and the pressure calibration interface is used to install a pressure gauge.

8. The intraocular pressure simulation device according to claim 1, characterized in that: The liquid containing structure further comprises a pressure relief valve disposed on the outer surface of the box body, and the pressure relief valve is connected to the second chamber.

9. The intraocular pressure simulation device according to claim 1, characterized in that: Also includes: A base, wherein the base has a receiving groove, the liquid receiving structure is arranged in the receiving groove, and a sliding groove is provided at the bottom of the base; The base is arranged on the slider and is slidably connected with the slider.

10. The intraocular pressure simulation device according to claim 8, characterized in that: Also includes: Compensation motor; A telescopic rod, one end of which is connected to the base, and the other end of which is connected to the compensation motor.

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