A modified patellar mobility measuring instrument
By using an improved patellar mobility measuring instrument with an infrared measuring device and a fixation structure, the problems of accuracy and convenience in measuring patellar mobility have been solved, and high-precision measurement under single-person operation has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI UNIVERSITY OF TRADITIONAL CHINESE MEDICINE
- Filing Date
- 2025-04-03
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies for measuring patellar mobility suffer from several drawbacks, including strong individual subjectivity, insufficient quantification, cumbersome operation requiring the collaboration of two medical personnel, and significant measurement errors due to the lack of knee joint fixation.
A modified patellar mobility measuring instrument, including a slider and digital calipers, is used. An infrared measuring instrument is used to locate the initial and moving positions of the patella, and the distance of patellar movement is measured by digital calipers. Combined with a fixation structure to fix the knee joint, it provides measurement reference points and reduces errors.
It improves the accuracy of measurement and the convenience of single-person operation, ensures measurement precision and the stability of the fixed structure, and avoids errors caused by slight knee joint movements.
Smart Images
Figure CN224269307U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of measuring instruments, and specifically relates to an improved patellar movement measuring instrument. Background Technology
[0002] Patellofemoral arthritis is a common degenerative osteoarthritis in clinical practice. Biomechanical abnormalities of the patellofemoral joint, especially around the patella, are one of the main causes of patellofemoral arthritis. Extensive clinical observation has revealed the importance of peripatellar balance. The concept and techniques of peripatellar balance have effectively promoted the relief of knee pain, swelling, and stiffness, and the rehabilitation of knee function, significantly reducing the incidence of disability and deformity, while also significantly improving patients' quality of life, bringing substantial benefits to society and families. Currently, the commonly used clinical methods for examining and assessing patellar mobility often rely on visual observation to compare the patellar mobility of the healthy lower limb. This method is too subjective and lacks quantitative quantification. While some clinicians use length measuring tools such as tape measures and calipers to measure patellar mobility, these conventional measuring tools lack reference points, resulting in low accuracy. In particular, during single-person operation, it is impossible to stabilize the measuring instrument with one hand and push the patella with the other, resulting in a large error. Currently, at least two medical personnel are required to complete the operation, which is too cumbersome. Moreover, the knee joint is not fixed during the actual operation, and there is slight movement of the knee joint position during the patella pushing process, which introduces errors. Utility Model Content
[0003] To address the aforementioned problems, this utility model provides an improved patellar movement measuring instrument, comprising a sliding component and a digital caliper. The reading head of the digital caliper is rotatably connected to the sliding component. A laser positioning device is provided on the reading head of the digital caliper. A limiting structure is provided on the body of the digital caliper. The end of the limiting structure away from the body of the caliper is connected to the sliding component. A fixing structure is detachably connected to the side of the sliding component away from the digital caliper.
[0004] Furthermore, the limiting structure includes a connecting plate, an angle limiting plate, and a limiting member. One end of the connecting plate is connected to the ruler body, and the other end of the connecting plate is provided with an angle limiting plate. The sliding member is provided with a limiting member, and the limiting member is housed within the angle limiting plate.
[0005] Furthermore, the angle limiting plate is provided with an angle limiting groove, and the limiting member is accommodated in the angle limiting groove.
[0006] Furthermore, the slider is provided with a rotating structure, and the slider is connected to the reading head of the digital caliper through the rotating structure.
[0007] Furthermore, the sliding member includes a slide rail and a slider, the slide rail is provided with a slider, and the rotating structure is provided on the slider.
[0008] Furthermore, the rotating structure includes a connecting shaft, a bearing, and a fixed plate. The fixed plate contains a bearing, and the inner ring of the bearing contains a connecting shaft. The fixed plate is connected to the reading head, and the end of the connecting shaft away from the fixed plate is connected to a sliding member.
[0009] Furthermore, the fixing structure includes a first clamp and a second clamp, both of which are detachably connected to the sliding member.
[0010] Furthermore, the first clamp and the second clamp have the same structure. The second clamp includes a support plate and a clamping member. The clamping member is connected to the support plate by fasteners. The end of the support plate away from the clamping member is detachably connected to the sliding member by a mounting member.
[0011] Furthermore, the clamping element includes a clamping plate and a threaded rod, the clamping plate being provided with a threaded rod, and the threaded rod being connected to the support plate by fasteners.
[0012] Furthermore, the sliding member has threaded grooves evenly distributed on the side near the fixed structure.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1) This utility model fixes the knee joint through a fixed structure, locates the initial position and the position after movement of the patella through an infrared measuring instrument, and measures the distance of patella movement by digital calipers based on the positioning of the infrared measuring instrument. This not only improves the accuracy, but also improves the convenience of single-person operation.
[0015] 2) The infrared measuring instrument in this utility model can provide a measurement reference point for the entire measurement process, ensuring measurement accuracy and reducing errors.
[0016] 3) The fixing structure in this utility model provides a fixing point for the human to push the patella, avoiding slight movement of the knee joint and avoiding errors.
[0017] 4) The fixation structure in this invention can fix the medial and lateral femoral condyles, making the measurement of patellar mobility more accurate.
[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description
[0019] 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, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A schematic diagram of the modified patellar mobility measuring instrument is shown.
[0021] Figure 2 A schematic diagram showing the rotating structure connecting the digital caliper and the sliding component is shown;
[0022] Figure 3 It shows Figure 2 Rear view;
[0023] Figure 4 A schematic diagram of the rotating structure is shown;
[0024] Figure 5 It shows Figure 4 A magnified view of part A in the image;
[0025] Figure 6 A schematic diagram of the threaded groove is shown.
[0026] Reference numerals: 1. Fixed structure; 11. First clamping member; 12. Flexible connecting member; 13. Second clamping member; 131. Clamping member; 1311. Clamping plate; 1312. Threaded rod; 132. Support plate; 2. Sliding member; 21. Slide rail; 211. Threaded groove; 22. Slider; 3. Limiting structure; 31. Angle limiting plate; 311. Angle limiting groove; 32. Limiting member; 33. Connecting plate; 4. Laser positioning instrument; 5. Digital caliper; 51. Reading head; 52. Scale body; 521. Depth measuring rod; 6. Rotating structure; 61. Connecting shaft; 62. Bearing; 63. Fixed plate. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0028] Figure 1 A schematic diagram of the modified patellar mobility measuring instrument is shown. Figure 1As shown, a modified patellar movement measuring instrument includes a slider 2 and a digital caliper 5. The reading head 51 of the digital caliper 5 is rotatably connected to the slider 2. Figure 3 It shows Figure 2 Rear view, such as Figure 3 As shown, the digital caliper 5 has a laser positioning device 4 on its reading head 51 and a limiting structure 3 on its body 52. The end of the limiting structure 3 away from the body 52 is connected to the sliding member 2, and the side of the sliding member 2 away from the digital caliper 5 is detachably connected to a fixing structure 1.
[0029] The fixation structure 1 in the improved patellar movement measuring instrument serves to fix the knee joint. Based on the fixation structure 1, an infrared measuring instrument is used to locate the initial position and the position after movement of the patella, thereby determining the reference point for measurement. Based on the reference point, a digital caliper 5 is used to measure the distance of patella movement, which not only improves accuracy but also enhances the convenience of single-person operation.
[0030] In some embodiments, the limiting structure 3 includes a connecting plate 33, an angle limiting plate 31, and a limiting member 32. One end of the connecting plate 33 is connected to the ruler body 52, and the other end of the connecting plate 33 is provided with the angle limiting plate 31. The sliding member 2 is provided with the limiting member 32, which is housed within the angle limiting plate 31. The limiting member 32 restricts the position of the angle limiting plate 31, preventing it from wobbling and ensuring the stability of the digital caliper 5 during rotation. The angle limiting plate 31 limits the range of angle rotation for the digital caliper 5. The connecting plate 33 connects the ruler body 52 and the angle limiting plate 31.
[0031] Specifically, the limiting element 32 is optional but not limited to a positioning pin.
[0032] In some embodiments, the angle limiting plate 31 is arc-shaped to facilitate the rotation of the digital caliper 5.
[0033] In some embodiments, the angle limiting plate 31 is provided with an angle limiting groove 311, and the limiting member 32 is accommodated in the angle limiting groove 311. The limiting member 32 is accommodated in the angle limiting groove 311 to limit the position of the angle limiting plate 31, prevent the angle limiting plate 31 from shaking at will, and ensure the stability of the digital caliper 5 during rotation. The angle limiting groove 311 limits the rotation angle of the digital caliper 5.
[0034] In some embodiments, the connecting plate 33 is connected to the depth measuring rod 521 of the ruler body 52, which avoids occupying too much space and improves the rationality.
[0035] Figure 2 A schematic diagram showing the rotating structure connecting the digital caliper and the sliding component is shown. Figure 2As shown, in some embodiments, the sliding member 2 is provided with a rotating structure 6, and the sliding member 2 is connected to the reading head 51 of the digital caliper 5 through the rotating structure 6; the rotating structure 6 provides rotation conditions for the reading head 51 of the digital caliper 5, so that the laser positioning instrument 4 is positioned to the position after the patella displacement as the reading head 51 rotates and the sliding member 2 slides, which not only provides a reference point for the measurement of the digital caliper 5, but also improves the accuracy of the measurement.
[0036] In some embodiments, the slider 2 includes a slide rail 21 and a slider 22. The slider 22 is provided on the slide rail 21, and the rotating structure 6 is disposed on the slider 22. The slider 22 provides an installation position for the rotating structure 6 and also provides a moving condition for the reading head 51 of the digital caliper 5. The slide rail 21 provides a displacement condition for the slider 22.
[0037] Specifically, the limiting element 32 is provided on the slide rail 21.
[0038] Figure 4 A schematic diagram of the rotating structure is shown. (See diagram below.) Figure 4 As shown, in some embodiments, the rotating structure 6 includes a connecting shaft 61, a bearing 62, and a fixing plate 63. Figure 5 It shows Figure 4 A magnified view of part A, as shown below. Figure 5 As shown, the fixed plate 63 is provided with a bearing 62, and the inner ring of the bearing 62 is provided with a connecting shaft 61. The fixed plate 63 is connected to the reading head 51, and the end of the connecting shaft 61 away from the fixed plate 63 is connected to the sliding member 2. The connecting shaft 61 serves to connect the sliding member 2 and the bearing 62, and also provides a support point for the digital caliper 5. The bearing 62 provides the rotation conditions for the reading head 51. The fixed plate 63 serves to connect the reading head 51 and the bearing 62.
[0039] In some embodiments, the end of the connecting shaft 61 away from the connecting plate 33 is connected to the slider 22, which not only provides rotation conditions for the reading head 51 of the digital caliper 5, but also provides support conditions for the reading head 51 of the digital caliper 5.
[0040] In some embodiments, the fixation structure 1 includes a first clamp 11 and a second clamp 13, both of which are detachably connected to the slider 2. The detachable connection of the first clamp 11 and the second clamp 13 to the slider 2 improves the adaptability of the fixation structure 1 to accommodate different patients.
[0041] In some embodiments, the first clamp 11 and the second clamp are connected by a flexible connector 12; the flexible connector serves to connect the first clamp 11 and the second clamp 13, making it easy to carry.
[0042] In some embodiments, the first clamp 11 and the second clamp 13 have the same structure. The second clamp 13 includes a support plate 132 and a clamping member 131. The clamping member 131 is connected to the support plate 132 by fasteners. The end of the support plate 132 away from the clamping member 131 is detachably connected to the sliding member 2 by a mounting member. The first clamp 11 and the second clamp 13 have the same structure to clamp the knee joint. The detachable connection between the support plate 132 and the sliding member 2 facilitates adjustment to accommodate different sizes of knee joints. The support plate 132 provides a support point for the clamping member 131.
[0043] In some embodiments, the clamping member 131 is provided with a flexible connector 12 for easy carrying.
[0044] Specifically, the flexible connector 12 may be an option, but is not limited to, an elastic band.
[0045] Specifically, fasteners can be, but are not limited to, nuts.
[0046] Specifically, mounting components are optional but not limited to bolts.
[0047] In some embodiments, the clamping member 131 includes a clamping plate 1311 and a threaded rod 1312. The clamping plate 1311 is provided with the threaded rod 1312, which is connected to the support plate 132 by fasteners. The support plate 132 provides a support point for the threaded rod 1312. The threaded rod 1312 provides a connection condition for the clamping member 131. The clamping plate 1311 is used to clamp the patient's knee joint. When it is necessary to adjust the angle of the support plate 132, the fasteners can be loosened to adjust the angle of the support plate 132.
[0048] Figure 6 A schematic diagram of the threaded groove is shown. (For example...) Figure 6 As shown, in some embodiments, the sliding member 2 has threaded grooves 211 evenly distributed on the side near the fixed structure 1; the multiple threaded grooves 211 facilitate the adjustment of the position of the clamping member 131 to accommodate different sizes of knee joints.
[0049] Specifically, the slide rail 21 has threaded grooves 211 evenly distributed on the side near the fixed structure 1.
[0050] Specifically, the side of the slide rail 21 away from the slider 22 is curved, which makes it easy to fit the shape of the leg.
[0051] The working principle of the modified patellar mobility measuring instrument is as follows:
[0052] After fixing the knee joint and finding the measurement reference point using the laser positioning device 4, the digital caliper 5 is used for measurement. The clamping element 131 is installed on the support plate 132, and the support plate 132 is fixed to the slide rail 21 according to the patient's knee joint width. After fixing, the slider 22 is pushed, and the angle of the reading head 51 is adjusted so that the laser positioning device 4 positions the patella at its initial position. The data displayed on the reading head 51 is then confirmed. The patella is then manually pushed until it cannot be pushed further. At this point, the slider 22 is pushed again, and the angle of the reading head 51 is adjusted so that the laser positioning device 4 positions the patella at its final position after the push. The data displayed on the reading head 51 is then confirmed. The difference between the initial and final positions is the patella's range of motion.
[0053] With the knee joint fixed, the initial position and the position after movement of the patella are located using a laser positioning instrument 4, thereby determining the reference point for measurement. Based on the reference point, the distance of patella movement is measured using a digital caliper 5, which not only improves accuracy but also enhances the convenience of single-person operation.
[0054] Specifically, if the data at the initial position is zero, then the data at the final position is the range of motion of the patella.
[0055] Although the present invention has been described in detail 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A modified patellar mobility measuring instrument, characterized in that, The device includes a slider (2) and a digital caliper (5). The reading head (51) of the digital caliper (5) is rotatably connected to the slider (2). The reading head (51) of the digital caliper (5) is equipped with a laser positioning device (4). The body (52) of the digital caliper (5) is equipped with a limiting structure (3). The end of the limiting structure (3) away from the body (52) is connected to the slider (2). The side of the slider (2) away from the digital caliper (5) is detachably connected to a fixing structure (1).
2. The improved patellar mobility measuring instrument according to claim 1, characterized in that, The limiting structure (3) includes a connecting plate (33), an angle limiting plate (31), and a limiting member (32). One end of the connecting plate (33) is connected to the ruler body (52), and the other end of the connecting plate (33) is provided with an angle limiting plate (31). The sliding member (2) is provided with a limiting member (32), and the limiting member (32) is housed in the angle limiting plate (31).
3. The improved patellar mobility measuring instrument according to claim 2, characterized in that, The angle limiting plate (31) is provided with an angle limiting groove (311), and the limiting member (32) is accommodated in the angle limiting groove (311).
4. The improved patellar mobility measuring instrument according to claim 1, characterized in that, The slider (2) is provided with a rotating structure (6), and the slider (2) is connected to the reading head (51) of the digital caliper (5) through the rotating structure (6).
5. The improved patellar mobility measuring instrument according to claim 4, characterized in that, The sliding member (2) includes a slide rail (21) and a slider (22). The slider (22) is provided on the slide rail (21), and the rotating structure (6) is provided on the slider (22).
6. The improved patellar mobility measuring instrument according to claim 4, characterized in that, The rotating structure (6) includes a connecting shaft (61), a bearing (62) and a fixing plate (63). The fixing plate (63) contains the bearing (62), and the inner ring of the bearing (62) contains the connecting shaft (61). The fixing plate (63) is connected to the reading head (51), and the end of the connecting shaft (61) away from the fixing plate (63) is connected to the sliding member (2).
7. The improved patellar mobility measuring instrument according to claim 1, characterized in that, The fixing structure (1) includes a first clamp (11) and a second clamp (13), both of which are detachably connected to the sliding member (2).
8. The improved patellar mobility measuring instrument according to claim 7, characterized in that, The first clamp (11) has the same structure as the second clamp (13). The second clamp (13) includes a support plate (132) and a clamping member (131). The clamping member (131) is connected to the support plate (132) by fasteners. The end of the support plate (132) away from the clamping member (131) is detachably connected to the sliding member (2) by an mounting member.
9. The improved patellar mobility measuring instrument according to claim 8, characterized in that, The clamping member (131) includes a clamping plate (1311) and a threaded rod (1312). The clamping plate (1311) is provided with a threaded rod (1312), and the threaded rod (1312) is connected to the support plate (132) by fasteners.
10. The improved patellar mobility measuring instrument according to any one of claims 1 to 8, characterized in that, The sliding member (2) has threaded grooves (211) evenly distributed on the side near the fixed structure (1).