Elastic dot matrix imprinting testing device
By designing an elastic dot matrix imprinting test device, using the combination of elastic pads and pressure sensitive films, the problem of high cost and insufficient resolution of footprint detection in the prior art is solved, and high accuracy and repeated use are achieved and widely applicable stress distribution detection.
Patent Information
- Application Number
- CN202420712453.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-08
AI Technical Summary
In the existing medical diagnosis, the footprints of sensor testing are expensive and have limited resolution. The image analysis methods are blurred, easy to mutate and difficult to analyze. Disposable products are expensive, making it difficult to achieve high accuracy and multiple repetitions. use.
Design an elastic dot matrix imprinting test device, including an elastic pad, a pressure-sensitive film and a base, with an elastic convex dot array evenly distributed on the elastic pad, displaying stress distribution images through the pressure-sensitive film, and combining power supply and reset keys to achieve multiple repetitions Use and high accuracy detection.
It realizes stress distribution detection that is visible to the naked eye, pollution-free, damage-free, safe, convenient and accurate, reduces product manufacturing costs, improves detection accuracy and repeatability, and is suitable for stress analysis of the soles of the feet and other human body parts.
Smart Images
Figure CN222237663U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of medical diagnostic images and image printing analysis, in particular to an elastic dot matrix imprint testing device. Background Art
[0002] Image analysis methods are commonly used in medical clinics and scientific research, especially footprint image analysis, which is often used in orthopedics, especially geriatrics and neurology gait examinations. Existing technologies are divided into two categories: sensor testing and image analysis. Sensor testing uses tens to hundreds of thousands of sensors to collect footprints at high speed and accurately at the same time to obtain a dynamic pressure distribution map of the sole of the foot. The price is high, and the position resolution of the pressure distribution test is generally a minimum of 5mm×5mm surface element; while image analysis uses an optical camera or camera system to use powdered or pasty media, such as printing ink, or rubbing paper, carbon paper to leave footprints on a flat plate. This method and equipment are relatively cheap. However, in the printed image, the traces are very shallow and the shape is relatively blurred, making it difficult to conduct the next step of analysis. Pressing with water-based writing paper will present a whole piece of printing and dyeing traces (such as Figure 1 As shown in the figure, therefore, the image analysis of the printed and dyed pictures generally relies on the grayscale of the printing and dyeing to calculate its stress condition. This calculation method is prone to large deviations, and with the passage of time and the evaporation of water, the printed and dyed pictures will change. There will also be problems such as improper operation affecting the result analysis. In addition, pressure-sensitive photo paper can also be used in the image analysis method. Although it can be clean and high-resolution, it is a disposable product and is still expensive when used in large quantities. Utility Model Content
[0003] In view of the above problems, the main purpose of the utility model is to provide an elastic dot matrix imprint testing device, which is used for imprint testing in medical diagnosis and belongs to the image analysis method. Under the premise of reducing product manufacturing costs, it can be reused many times, is visible to the naked eye, and will not change over time, thereby improving detection accuracy. Overall, it is pollution-free and damage-free, and is safe, convenient and accurate to use.
[0004] In order to achieve the above-mentioned purpose, the elastic dot matrix imprint testing device of the utility model includes an elastic pad, a pressure-sensitive membrane and a base, the elastic pad is movably located on the upper surface of the pressure-sensitive membrane, the pressure-sensitive membrane is fixed on the base, the elastic pad includes a main body and a convex point array located on the bottom surface of the main body, the convex point array is composed of a plurality of elastic convex points, and the elastic convex points are evenly distributed on the lower bottom surface of the main body.
[0005] Furthermore, the elastic protrusion includes an end point structure, and the cross section of the end point structure decreases along the direction away from the body.
[0006] Furthermore, the elastic protrusion also includes a column structure, the upper end surface of the column structure is connected to the bottom surface of the body, and the lower end surface coincides with the plane of the end point structure.
[0007] Furthermore, the material of the main body is selected from an elastic material with a certain hardness to ensure that it will not be stretched or deformed when subjected to pressure, and at the same time can transmit the force applied thereto downward.
[0008] Furthermore, the elastic protrusions are made of elastic material.
[0009] Furthermore, the base is provided with a power supply.
[0010] Furthermore, the pressure sensitive membrane is electrically connected to a power source.
[0011] Furthermore, the base is also provided with a reset button, which is used to clear the content displayed on the pressure sensitive film.
[0012] Through the above technical solution, the beneficial effects of the utility model include:
[0013] (1) The elastic dot matrix imprint testing device of the utility model is used in combination with a pressure sensitive film and an elastic pad. Specifically, after a human body presses on the elastic pad, the image area formed on the pressure sensitive film by the elastic convex points distributed in an array on the elastic pad is analyzed to obtain the final human body stress distribution result;
[0014] (2) In addition, the test method and analysis method of the utility model are simple but accurate, reusable, and can be directly identified by the naked eye and will not change over time. Under the premise of abandoning the high cost of sensor detection, high-accuracy and highly standardized detection and analysis results can also be obtained;
[0015] (3) Secondly, the pressure sensitive membrane of the utility model has a wide range of applications. In addition to sole detection, it can also be used for stress analysis of any part of the human body, such as sciatic analysis and lying force distribution analysis. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0017] Figure 1 It is a printing and dyeing pattern used in the prior art.
[0018] Figure 2 It is a structural schematic diagram of the utility model.
[0019] Figure 3 It is a structural schematic diagram of the elastic pad of the utility model.
[0020] Figure 4 It is a structural schematic diagram of a base of the utility model.
[0021] Figure 5 It is a structural schematic diagram of a unit structure of the elastic pad of the utility model.
[0022] Figure 6 It is a reference diagram for use of the unit structure of the utility model.
[0023] Figure 7 It is a usage state diagram of the utility model.
[0024] Figure 8 It is an elastic dot matrix footprint of the pressure sensitive film of the utility model.
[0025] Fig. 9 It is an enlarged structural diagram of the A portion in the elastic dot matrix footprint diagram of the present invention.
[0026] Fig.10 It is a structural schematic diagram of an elastic pad according to another embodiment of the present invention.
[0027] Description of Reference Numerals
[0028] 10. Pressure sensitive membrane;
[0029] 20. Elastic pad;
[0030] 21. Ontology;
[0031] 22. Elastic convex points;
[0032] 220. Column structure;
[0033] 221. Endpoint structure;
[0034] 30. Base;
[0035] 302. Power supply;
[0036] 40. Feet. DETAILED DESCRIPTION
[0037] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.
[0038] like Figure 2, which is a schematic diagram of the structure of the elastic dot matrix imprint testing device of the utility model. In this embodiment, the elastic dot matrix imprint testing device is provided with an elastic pad 20, a pressure sensitive film 10 and a base 30. The elastic pad 20 is movably located on the upper surface of the pressure sensitive film 10. The pressure sensitive film 10 is fixed on the base 30 and is electrically connected to the base 30. In this embodiment, the pressure sensitive film 10 is a liquid crystal drawing board. In other embodiments, it can be prepared by other structures or materials that can display images after being pressed. Please refer to Figure 3 As shown, in this embodiment, the elastic pad 20 is provided with a body 21 and a convex point array located on the bottom surface of the body 21 . The convex point array is composed of a plurality of elastic convex points 22 . The elastic convex points 22 are evenly distributed on the bottom surface of the body 21 .
[0039] The material of the body 21 of the elastic pad must meet two basic requirements:
[0040] (1) When pressure is applied thereto, it will not stretch or deform in the plane, thereby ensuring that the spacing between the elastic bumps 22 in the bump array on the bottom surface thereof remains unchanged;
[0041] (2) On the basis of not deforming under force, the main body 21 can also serve as a force transmission component to transmit the force applied thereto to the elastic protrusion 22, thereby ensuring that the elastic protrusion 22 is deformed, and the strength of the deformation is positively correlated with the magnitude of the force applied to the corresponding part of the main body 21.
[0042] It can be understood that the material of the main body 21 is selected from an elastic material with a certain hardness. For example, the main body 21 can be made of a material similar to that used to make basketballs (the thickness of the main body 21 is thinner than that of the material used to make basketballs). Alternatively, a composite material similar to cloth and rubber softly bonded together can be selected to manufacture the main body so that it has flexible and soft properties.
[0043] The pressure sensitive film 10 is selected from the prior art. A common design principle is that liquid crystal molecules and dyes (such as fluorescent dyes) are arranged therein. The liquid crystal molecules reflect the color of the dye under different pressures, so that the pressure sensitive film 10 presents an image.
[0044] See also Figure 4 As shown, it is a schematic diagram of the structure of the base 30 in the utility model. In this embodiment, the base 30 is provided with a power supply 302 and a reset button. The power supply 302 is located on the back of the base 30. The pressure sensitive film 10 in the utility model is electrically connected to the power supply 302. The reset button is used to clear the image on the pressure sensitive film 10 in the previous round of detection during multiple detection processes. The structure of the pressure sensitive film 10 in this embodiment is prior art and will not be described in detail here.
[0045] See also Figure 5 and Figure 6As shown, in this embodiment, each elastic protrusion 22 on the elastic pad 20 is provided with a column structure 220 and an end point structure 221. The cross-sectional area of each part of the column structure 220 remains unchanged, and the cross-sectional area of the end point structure 221 gradually decreases in the direction away from the column structure, and the lowermost end is close to a "point". Therefore, as the force applied to the elastic protrusion 22 gradually increases, the elastic protrusion 22 is squeezed and deformed more, the contact area with the pressure sensitive film 10 increases, and the imaging area on the pressure sensitive film 10 also increases.
[0046] Please combine Figure 7 and Figure 8 As shown, the working method and principle of the utility model are: when testing a patient, the elastic pad 20 is placed on the pressure sensing membrane 10, wherein the side provided with the elastic protrusion 22 faces the pressure sensing membrane 10. Here, the test of the patient's foot 40 is taken as an example. The foot 40 applies force to the body 21 of the elastic pad 20, and the body 21 transmits the force to the elastic protrusion 22. After the elastic protrusion 22 is pressed, it abuts against the upper surface of the pressure sensitive membrane 10 on the base 30. Since the lower end of the elastic protrusion 22 is a structure close to a "point", a pressing point is formed on the pressure sensitive membrane 10. Since the pressure of the foot 40 at different positions on the elastic pad 20 is different, as the local compressive stress increases, the contact area of the top of the elastic protrusion 22 increases, and a stress lattice with different sizes along with the distribution of the compressive stress is formed on the pressure sensitive membrane 10. A plurality of stress lattices form a lattice diagram. Through the number and distribution of the stress lattices presented in the imaging diagram, and the size of each stress lattice, the strength of different parts of the patient's foot can be analyzed, and then used as a medical test.
[0047] like Figure 8 As shown, it is a dot matrix diagram after the foot 40 is stamped. Since the material of the elastic protrusions 22 in the utility model is a soft material with strong elastic force, it will deform when subjected to external force. Therefore, during the stamping process, the areas of the stress dot matrix at different stress points vary due to different stresses. The force applied by the heel is the largest, so that the stress dot matrix formed after the elastic protrusions 22 of this part are pressed down is in a saturated state.
[0048] If the cross-section of the column structure 220 and the end structure 221 of the elastic convex point 22 is circular, the shape of the stress lattice formed by pressing down is also circular. If the cross-section of the column structure 220 and the end structure 221 of the elastic convex point 22 is a regular hexagonal structure, the shape of the stress lattice formed by pressing down is also a regular hexagonal structure (such as Fig. 9 As shown in FIG. 1 ), six other stress lattices of the regular hexagonal structure are evenly distributed around each stress lattice of the regular hexagonal structure and have the same shape and size. In other embodiments, the structure of the elastic protrusion 22 does not have a column structure 220, but only has an end structure 221, such as Fig.10As shown, the structure of the end point structure 221 is a semi-spherical structure, the lowest point of the end point structure 221 is a "point" structure, and the end point structure 221 is arranged in an array of regular six-point arrays. Specifically, except for the end point structure 221 at the edge of the elastic pad 20, six end point structures 221 are evenly distributed in a circumferential shape around any other end point structure 221. At this time, the shape of the elastic pad 20 on the pressure sensitive film 10 after being compressed is a point structure with a regular hexagonal dot matrix shape around it. In other embodiments, In the figure, the end point structures 221 are arranged in a regular four-point array. Specifically, except for the end point structures 221 at the edge of the elastic pad 20, four end point structures 221 are evenly distributed in a circular shape around any other end point structure 221. At this time, the shape of the elastic pad 20 on the pressure sensitive film 10 after being compressed is a dot structure with a dot matrix shape distributed around it in a square. There is no restriction on the array mode of the end point structures 221. As long as they are evenly arranged in a dot matrix, the final effect of the utility model can be achieved.
[0049] It should be noted that the spacing between the multiple elastic protrusions 22 of the present invention should be set so that when the force is saturated, the stress point arrays formed by the downward pressure will not be connected into a whole piece, but form separate regular hexagons, circles or other specific shapes.
[0050] The elastic protrusions 22 are made of an elastic material with a certain hardness, such as rubber, silicone or the like. In addition, the size, diameter and distribution density of the elastic protrusions 22 are set as required and are evenly spaced on the lower bottom surface of the body 21 .
[0051] The utility model may not be provided with the column structure 220, but only with the end point structure 221, and the effect of forming stress lattices of different sizes with different pressing strengths during the pressing process can still be achieved.
[0052] After reading the dot matrix, if it is necessary to end the test or to proceed to the next patient, the reset button is directly pressed and the pressure sensitive membrane 10 is restored to a state without stress. In this way, the pressure sensitive membrane 10 can be reused multiple times, with rapid response and simple operation. The obtained dot matrix can be directly recognized by the naked eye, will not change over time, and has strong stability.
[0053] The final result analysis of the present invention is to calculate and analyze the area of the stress dot matrix formed by each elastic protrusion 22 on the image finally obtained on the pressure sensitive film 10, and finally obtain the local stress data of the foot 40. It is mainly through taking pictures and compiling special software to perform digital analysis on the dot matrix footprint image, so as to obtain a relatively accurate plantar stress distribution. This analysis process is a prior art, and one of the analysis processes is illustrated here as an example. Other analysis methods are not limited to this and will not be repeated.
[0054] Calculation example: Since the elastic bump 22 has a relatively consistent and stable "pressure p[i] -- contact area a[i]" relationship, the quantitative relationship between the two can be obtained through calibration experiments, which can be (but not limited to) using cubic polynomial fitting and image measurement, such as Figure 4 As shown, it is an elastic dot matrix footprint diagram of the pressure sensitive film 10. The contact area a[i] of a certain elastic convex point in the elastic dot matrix footprint diagram is calculated by the pressure p[i], and the following relationship is obtained:
[0055] p[i] = b0 + b1×a[i] + b2×a[i] 2 + b3×a[i] 3
[0056] Among them, b0, b1, b2, and b3 are the coefficients obtained by calibration.
[0057] Each point of the lattice supports a fixed small area s, which can be calculated by the periodic point spacing d, usually a hexagonal lattice (s = 0.866×d 2 ) or a square lattice (s = d 2 ). Then the local stress σ[i] of the convex point can be obtained as:
[0058] σ[i] = p[i] / s
[0059] Through the above calculation and analysis process, the real stress distribution of the sole is obtained through the contact area of the elastic protrusions 22 on the pressure sensitive film 10. The denser the dot matrix of the elastic protrusions 22, the higher the in-plane resolution.
[0060] Therefore, the utility model directly performs stress analysis through the number and size of stress lattices, which has higher accuracy and simpler calculation process compared with the prior art technology of performing printing and dyeing image analysis through grayscale.
[0061] At the same time, the elastic dot matrix imprint testing device of the utility model, equipped with corresponding equipment, can test the contact stress of the body surface, is reusable, non-toxic and harmless, and does not damage the human body. It can be used in hospitals and scientific research institutions, and can also be used in homes, providing a relatively simple, safe and accurate method for human body mechanics testing such as prosthetic applications, shoe design, and occupational disease protection. At the same time, it is not limited to the test of the human foot 40, but can also be applied to the testing, application and use of other parts of the human body, such as testing hand stress, or testing body stress to detect the presence of bedsores, etc.
[0062] It is hereby explained that, in other embodiments, the structure of the elastic protrusion 22 of the present invention is not limited to a shape composed of a hemispherical or cylindrical shape and a hemispherical shape, and may also be a pyramid or other shape structure, such as a quadrangular pyramid structure. As long as the purpose of calculating the stress at the location can be achieved by means of the different areas or shapes formed after imprinting, it falls within the scope of protection of the present invention. Therefore, the present application is not limited to this, and this is hereby explained.
[0063] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
Claims
1. An elastic dot matrix imprint testing device, characterized in that: The invention comprises an elastic pad (20), a pressure sensitive film (10) and a base (30), wherein the elastic pad (20) is movably located on the upper surface of the pressure sensitive film (10), and the pressure sensitive film (10) is fixed on the base (30). The elastic pad (20) comprises a body (21) and a convex point array located on the bottom surface of the body (21), wherein the convex point array is composed of a plurality of elastic convex points (22), and the elastic convex points (22) are evenly spaced and distributed on the bottom surface of the body (21).
2. The elastic dot matrix imprint testing device according to claim 1, characterized in that: The elastic protrusion (22) comprises an end point structure (221), and the cross section of the end point structure (221) decreases in a direction away from the body (21).
3. The elastic dot matrix imprint testing device according to claim 2, characterized in that: The elastic protrusion (22) further comprises a column structure (220), the upper end surface of the column structure (220) being connected to the bottom surface of the body (21), and the lower end surface being coincident with the plane of the end point structure (221).
4. The elastic dot matrix imprint testing device according to claim 1, characterized in that: The material of the main body (21) is selected from an elastic material with a certain hardness, ensuring that it will not be stretched or deformed when pressure is applied thereto, while being able to transmit the force applied thereto downwards.
5. The elastic dot matrix imprint testing device according to any one of claims 1 to 4, characterized in that: The elastic protrusions (22) are made of elastic material.
6. The elastic dot matrix imprint testing device according to claim 1, characterized in that: The base (30) is provided with a power source (302).
7. The elastic dot matrix imprint testing device according to claim 6, characterized in that: The pressure sensitive membrane (10) is electrically connected to the power source (302).
8. The elastic dot matrix imprint testing device according to any one of claims 6 to 7, characterized in that: The base (30) is also provided with a reset button, and the reset button is used to clear the content displayed on the pressure sensitive film.