A device and method for measuring the head size of toddlers

Abstract

The present invention discloses a device and a measurement method for measuring the head size of toddlers, which include an upper laser measurement caliper and a lower digital display measurement caliper. The upper laser measurement caliper and the lower digital display measurement caliper are connected by a connecting rotating shaft and rotate relative to each other. A digital display angle reading structure is provided at the connecting rotating shaft. The lower digital display measurement caliper includes a lower slideway frame, a lower left clamping member, and a lower right clamping member. The left end of the lower slideway frame is connected to the lower left clamping member. The lower slide block of the lower right clamping member slides along the lower slideway frame. The lower right claw is provided at the extending portion of the lower slide block passing through the notch of the lower slideway frame. The lower left claw of the lower left clamping member corresponds to the lower right claw. A digital display distance measurement structure is provided on the lower slide block and the lower slideway frame. The upper laser measurement caliper includes an upper slideway frame. The upper left clamping member is slidably installed on the left side of the upper slideway frame, and the upper right clamping member is slidably installed on the right side of the upper slideway frame. The upper left clamping member includes an upper left slide block with rollers up and down that slides along the clamping groove of the upper slideway frame. The upper left claw and a laser distance meter are provided at the extending portion of the upper left slide block passing through the notch of the upper slideway frame.

Description

Technical Field

[0001] The present invention relates to a device and a measurement method for measuring the head size of infants, and is mainly used for data measurement when customizing orthopedic helmets for infants or patients with head deformities. Background Art

[0002] Orthopedic helmets are mainly applied to infants and young children with cranial deformities. Due to different degrees of abnormal development in the anteroposterior or lateral position of the skull of infants and young children, dislocation or limitation occurs during the growth and development of the brain structure, affecting the development of multiple brain regions, and even affecting nerve development and other issues, thus carrying out cranial orthopedics. Literature research found that cranial deformities can also affect the development and function of the oral and maxillofacial region, otorhinolaryngology region, and head and neck muscles of children. The incidence rate of children with cranial deformities is 22% at 7 weeks after birth and 21% at 2 years old. Evidence of poor cranial development in adults shows that there is a depression in the periosteum of the eardrum, and unilateral hearing is significantly weaker than the other side. Therefore, orthopedic helmets are of great significance for both the cranial morphology and the later physical health of patients in the early cranial orthopedic intervention of infants and young children.

[0003] Regarding the problem of cranial deformities in infants and young children, there are approximately two types of orthopedic products at home and abroad at present: The first is a special-shaped pillow for infants and young children to sleep on, but the orthopedic method completely depends on the shape of the pillow, and the orthopedic method is passive and cannot avoid the sleeping posture of infants and young children; The second is the orthopedic helmet provided by professional institutions, which is mainly used for children with problems in the head shape of infants and young children aged 4 to 15 months. However, for the precise measurement of children, there is no good measurement tool, and common tools include general measurement tools such as soft rulers, vernier calipers, and straight rulers. It is very difficult for a soft ruler to align the precise starting and ending points, and the error is large; Vernier calipers are generally made of iron or steel, with relatively sharp edges and corners, which are easy to bump or scratch infants, and the claws of vernier calipers generally have limited lengths and cannot achieve the ideal measurement purpose, and the edges of steel vernier calipers are very sharp and easy to bump infants; For the situation where the head curvature is irregular, the limitation of using a straight ruler for measurement is even greater, and it is inevitable to ensure the measurement accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and a measurement method for measuring the head size of infants, which can measure the head width, head length, and the length of the oblique diameter corresponding to the angle, with high measurement accuracy, safety, and convenient operation.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A device for measuring the head size of toddlers, comprising an upper laser measuring caliper and a lower digital display measuring caliper. The upper laser measuring caliper and the lower digital display measuring caliper are connected by a connecting rotating shaft and can rotate relative to each other. A digital display angle reading structure is provided at the connecting rotating shaft. The digital display angle reading structure includes an angle sensor module and a display module. The lower digital display measuring caliper includes a lower slideway frame, a lower left clamping member, and a lower right clamping member. The left end of the lower slideway frame is fixedly connected to the lower left clamping member. The lower right clamping member has lower sliding blocks with rollers up and down, which slide along the slot of the lower slideway frame. The lower right clamping claw is provided at the protruding part of the lower sliding block through the notch of the lower slideway frame. The lower left clamping claw of the lower left clamping member corresponds to the lower right clamping claw. A digital display distance measuring structure is provided on the lower sliding block and the lower slideway frame. The upper laser measuring caliper includes an upper slideway frame. The upper left clamping member is slidably installed on the left side of the upper slideway frame. The folding upper right clamping member is slidably installed on the right side of the upper slideway frame. The upper left clamping member includes an upper left sliding block with rollers up and down, which slides along the slot of the upper slideway frame. The upper left clamping claw and a laser distance measuring instrument are provided at the protruding part of the upper left sliding block through the notch of the upper slideway frame. The upper right clamping member includes an upper right sliding block with rollers up and down, which slides along the slot of the upper slideway frame. The upper right clamping claw is connected to the upper right clamping member through a self-locking folding hinge at the protruding part of the upper right sliding block through the notch of the upper slideway frame. The upper right clamping claw corresponds to the laser distance measuring instrument.

[0007] Specifically, a connecting rotating shaft is fixedly connected above the lower slideway frame. The upper part of the connecting rotating shaft passes through the upper slideway frame and fixes a grid angle sensor A. The upper slideway frame fixes a grid angle sensor B. The grid angle sensor B is connected to the display device.

[0008] The lengths of the upper right clamping claw and the upper left clamping claw are 35 cm, and the length of the lower right clamping claw is 30 cm.

[0009] The upper slideway frame, the upper left clamping member, the upper right clamping member, the lower slideway frame, the lower left clamping member, and the lower right clamping member are made of hard plastic, and all edges and corner structures are chamfered into smooth structures.

[0010] A base is installed on the top of the lower slideway frame. A T-shaped groove is opened on the base. The notch of the T-shaped groove faces upward. The lower end of the connecting rotating shaft is a hexagonal nut head. The width of the T-shaped groove is greater than or equal to the distance between the opposite sides of the hexagonal nut head and less than the circumscribed circle diameter of the hexagonal nut head. The installation gap between the wall surface of the T-shaped groove and the side wall surface of the corresponding hexagonal nut head is 0.1 to 0.2 mm. In order to ensure that the upper laser measuring caliper can only move along the length direction of the lower digital display measuring caliper driven by the connecting rotating shaft, so as to adjust the alignment of the upper laser measuring caliper with the sagittal plane of the skull.

[0011] A measuring method using the said device to determine the head length and head width. The head length is the straight-line distance from the midpoint I between the eyebrows to the farthest point G at the back of the occiput. The vertical plane where the midpoint between the eyebrows and the farthest point at the back of the occiput lies is defined as the sagittal plane of the skull. The position H of the tip of the nose is the reference point for determining the position I of the midpoint between the eyebrows. The head width is the straight-line distance between the position points of the attached protrusions on both auricles, that is, the starting point is the position point of the attached protrusion A on the auricle, and the ending point B is the same position point on the opposite side. Determine the length of the oblique diameter, which is the straight-line distance deviating from the sagittal plane of the skull, that is, the straight-line distance of the intersection points of the skull at 15°, 30°, and 45° deviations to the left and right. To obtain the oblique diameter ratio, that is, the deviation slope, which is the percentage value obtained by dividing the difference in the lengths of the oblique diameters by the lengths of the two oblique diameters, and it is one of the parameters for judging the state of skull deformity. During measurement, the lower left jaw is used as the reference position, and the protruding point A of the head shape is the initial point, that is, the position point clamped by the lower left jaw is point A. The lower right jaw moves on the lower carriage through four built-in rollers. When the lower right jaw clamps to the ending point B, the numerical value of the head width length will appear on the display screen of the digital display structure and be recorded. Then, slide the lower right jaw outward to release the width measurement state, rotate the measuring device so that the lower left jaw clamps to the farthest point G at the back of the occiput, and when the lower right jaw clamps to the position of the midpoint between the eyebrows, that is, point I, read and record the data on the display screen, and lock it through the lower positioning screw of the lower digital display measuring caliper, using the lower digital display measuring caliper as the reference "0" point. Then, turn the upper laser measuring caliper to the left or right to the required measuring angle and position it, then stop rotating, and then slide the upper left jaw and the upper right jaw to perform the corresponding length measurement.

[0012] Taking the measurement of the oblique diameter length in the 15° direction as an example, when the upper laser measuring caliper is turned to 15° and positioned, at this time, loosen the upper left positioning screw, and the upper left jaw can freely slide on the upper slide carriage through four rollers. Stop when the upper left jaw touches one side of the head, and tighten the upper left positioning screw to achieve the positioning of one side. Open the folding upper right jaw, loosen the upper right positioning screw to enable the movement of the upper right jaw, and stop when it touches a point on the head, then tighten the upper right positioning screw to achieve the positioning of the other side. Turn on the laser rangefinder, and a ray of light will hit the lower right jaw, and at the same time, the measured distance, that is, the length of the oblique diameter, will be displayed on the screen, completing the ranging task at this angle.

[0013] A measurement method using the said device to determine the head length and head width. The head length is the straight-line distance from the midpoint I between the eyebrows to the farthest point G at the back of the occiput. The vertical plane where the midpoint between the eyebrows and the farthest point at the back of the occiput lies is defined as the sagittal plane of the skull. The position H of the tip of the nose is the reference point for determining the position I of the midpoint between the eyebrows. The head width is the straight-line distance between the position points of the attached protrusions on both auricles, that is, the starting point is the position point of the attached protrusion A on the auricle, and the ending point B is the same position point on the opposite side. Determine the length of the oblique diameter, which is the straight-line distance deviating from the sagittal plane of the skull, that is, the straight-line distance of the intersection points of the skull when deviating 15°, 30°, and 45° to the left and right. To obtain the oblique diameter ratio, that is, the deviation slope, which is the percentage value obtained by dividing the difference in the lengths of the oblique diameters by the lengths of the two oblique diameters, and it is one of the parameters for judging the state of skull deformity. During measurement, the lower left jaw is used as the reference position, and the protruding point A of the head shape is the initial point, that is, the position point clamped by the lower left jaw is point A. The lower right jaw moves on the lower carriage through four built-in rollers. When the lower right jaw clamps to the ending point B, the numerical value of the head width will appear on the display screen of the digital display structure and be recorded. Then rotate the upper laser measuring caliper and move the connecting rotating shaft along the length direction of the base as needed, so that the left jaw clamps the farthest point at the back of the occiput and the right jaw clamps the midpoint between the eyebrows. The length of the skull will be recorded through the display screen of the laser rangefinder. Then slide the left and right jaws on both sides of the upper laser measuring caliper outward, rotate the upper laser measuring caliper to the required angle value, which is read through the display screen of the angle reading structure, and then slide the left and right jaws on both sides of the upper laser measuring caliper inward, corresponding to the corresponding positions of the skull, and read the skull distance at the required rotation angle position through the display screen of the laser rangefinder.

[0014] Advantages of the present invention: Infants and young children are in the stage of limb movement and behavioral awareness development and have no self-control ability. Therefore, safety is of utmost importance. In this application, while measuring the length, the measurement of the angle can be realized, solving the measurement difficulty in actual measurement and effectively completing the preliminary measurement of the head shape data of infants and young children. The measurement objectives achieved by this invention are as follows: First, measure the longitudinal and transverse lengths of the head shape; Second, in the longitudinal direction of the head shape, based on the angular positions of 15° and 30° to the left and right of the longitudinal direction of the head shape, realize the corresponding length measurement. Thus, the accuracy and scientific nature of the basic data measurement of the head shape of infants and young children are achieved, with simple operation and convenient measurement. Brief Description of the Drawings

[0015] To more clearly illustrate the embodiments of the present invention, the following will describe the embodiments in conjunction with the drawings.

[0016] Figure 1 It is a schematic structural diagram of the skull of an infant or young child.

[0017] Figure 2 It is a schematic structural diagram of the present invention.

[0018] Figure 3 It is a schematic structural diagram of the present invention when measuring the head width.

[0019] Figure 4 This is a schematic structural diagram when measuring the head length of the present invention.

[0020] Figure 5 This is a schematic structural diagram when measuring the head length and the oblique diameter length.

[0021] Figure 6 This is a schematic side view structure diagram of the cooperation between the upper slideway frame and the upper right clamping part of the present invention.

[0022] Figure 7 This is a schematic top view of the cooperation between the connecting rotating shaft and the base. Detailed implementation manners

[0023] The following only uses examples to illustrate the possible implementation modes of the present invention, but is not intended to limit the scope to be protected by the present invention. This is stated first.

[0024] As Figures 1 to 6 shown, a device for measuring the head size of a toddler includes an upper laser measuring caliper 1 and a lower digital display measuring caliper 2. The upper laser measuring caliper 1 and the lower digital display measuring caliper 2 are connected by a connecting rotating shaft 3 and can rotate relative to each other. A digital display angle reading structure 4 is provided at the connecting rotating shaft 3. The digital display angle reading structure 4 includes an angle sensor module and a display module. The lower digital display measuring caliper 2 includes a lower slideway frame 21, a lower left clamping part and a lower right clamping part. The left end of the lower slideway frame 21 is fixedly connected to the lower left clamping part, and the lower right clamping part is slidably installed on the lower slideway frame. A lower right stop block 24 is installed at the right end of the lower slideway frame 21. The upper and lower sliding blocks with rollers 25 on the lower right clamping part slide in the card slot of the lower slideway frame 21. The front part of the part of the sliding block extending out through the notch of the lower slideway frame 21 is hinged with a lower right clamping claw 26. The lower left clamping claw 27 of the lower left clamping part corresponds to the lower right clamping claw 26 and is used for measuring the head width and / or head length. A distance measuring and reading structure is provided on the sliding block and the lower slideway frame, and its digital display principle is the same as that of the existing digital display vernier caliper. The upper laser measuring caliper 1 includes an upper slideway frame 11. The left side of the upper slideway frame 11 is slidably installed with an upper left clamping part, and the right side of the upper slideway frame is slidably installed with a folding upper right clamping part. The upper left clamping part includes an upper left sliding block with rollers 121 up and down sliding in the card slot of the upper slideway frame. The part of the upper left sliding block extending out through the notch of the upper slideway frame 11 is provided with an upper left clamping claw 123 and a laser distance measuring instrument 124. The upper right clamping part includes an upper right sliding block 132 with rollers 131 up and down slidably installed in the card slot of the upper slideway frame 11. The front part of the part of the upper right sliding block 132 extending out through the notch of the upper slideway frame 11 is connected to an upper right clamping claw 133 through a self-locking folding hinge. The upper right clamping claw 133 corresponds to the laser distance measuring instrument 124. When reading, the laser distance measuring instrument is turned on, and the value obtained by the laser of the laser distance measuring instrument hitting the upper right clamping claw is the distance of the measured object.

[0025] The lengths of the upper right jaw and the upper left jaw are 35 cm, and the length of the lower right jaw is 30 cm. The upper slide rail frame, the upper left clamping member, the upper right clamping member, the lower slide rail frame, the lower left clamping member, and the lower right clamping member are made of hard plastic, and all edges and corner structures are chamfered into smooth structures to avoid bruising infants during measurement.

[0026] A connecting rotating shaft is fixedly connected above the lower slide rail frame. The upper part of the connecting rotating shaft passes through the upper slide rail frame and fixes the capacitive grating angle sensor A. The upper slide rail frame fixes the capacitive grating angle sensor B. The capacitive grating angle sensor B is connected to a display device (not shown in the figure). The digital display principle is the same as that of the existing digital display angle gauge.

[0027] As Figure 3 and Figure 7 shown, it is another implementation structure of the present invention. A base 5 is installed on the top of the lower slide rail frame. The base 5 is provided with a T-shaped groove with the groove opening facing upwards. The lower end of the connecting rotating shaft 3A is a hexagonal nut head. The width of the T-shaped groove is greater than or equal to the distance between the opposite sides of the hexagonal nut head and less than the circumscribed circle diameter of the hexagonal nut head. The installation gap between the wall surface of the T-shaped groove and the side wall surface of the corresponding bolt head is 0.1 to 0.2 mm. When measuring the head width with the lower digital display measuring caliper, rotate the upper laser measuring caliper to be perpendicular to the lower digital display measuring caliper. At this time, move the upper laser measuring caliper along the length direction of the T-shaped groove so that the measuring points in the corresponding length direction are used to measure the head length and the oblique diameter length of the required angle.

[0028] Next, the first measurement method of the device is introduced. As Figure 1As shown in the figure, the head length and head width are determined. The head length is the straight-line distance from the midpoint I between the eyebrows to the farthest point G at the back of the occiput, which is the straight-line length of the sagittal plane CD. The vertical plane where the midpoint I between the eyebrows and the highest point G of the external occipital protuberance is located is defined as the cranial sagittal plane. The tip of the nose position H point is the reference point for determining the midpoint I between the eyebrows (the position of the center of the eyebrows); the head width is the straight-line distance between the highest position points where the bulges are attached to the two auricles, that is, the starting point is the position point of the bulging attachment point A on the auricle (which can be determined by touch), and the end point B is the same position point on the opposite side; the oblique diameter length is determined, which is the straight-line distance deviating from the cranial sagittal plane position, that is, the straight-line distance of the cranial intersection points when deviating 15°, 30°, and 45° to the left and right. To obtain the oblique diameter ratio, that is, the deviation slope, which is the percentage of the difference in the oblique diameter lengths divided by the lengths of the two oblique diameters, and it is one of the parameters for judging the cranial malformation state. During the measurement, the lower left jaw is used as the reference position, and the convex point A of the head shape is the initial point, that is, the position point where the lower left jaw is clamped is point A. The lower right jaw moves on the lower carriage through four built-in rollers. When the lower right jaw clamps to the end point B, the numerical value of the head width length will appear on the display screen of the digital display structure and be recorded. Slide the lower right jaw outward to release the measurement state. Then rotate the measuring device so that the lower left jaw clamps to the farthest point G at the back of the occiput, and when the lower right jaw clamps to the midpoint I between the eyebrows, read and record the data on the display screen, and lock it through the lower positioning screw 10, using the following digital display caliper as the reference "0" point; then turn the upper laser measuring caliper to the left or right to the required measuring angle (15°, 30°, 45°) for positioning, and then stop rotating. Slide the upper left jaw and the upper right jaw to measure the length at this angle. Taking the measurement of the oblique diameter length in the 15° direction as an example, the measurement of the oblique diameter length in other angles is described. When the upper laser measuring caliper rotates to 15° for positioning, at this time, loosen the upper left positioning screw 20, and the upper left jaw can freely slide on the upper carriage through four rollers. Stop when the upper left jaw touches one side of the head, and tighten the upper left positioning screw 20 to achieve the positioning of one side; open the folding lower right jaw (that is, turn the upper right jaw in the horizontal state to the vertical state), loosen the upper right positioning screw 30 to enable the movement of the upper right jaw, and stop when it touches a point on the head, and tighten the upper right positioning screw 30 to achieve the positioning of the other side; turn on the laser rangefinder, and a ray of light will hit the lower right jaw, and at the same time, the measured distance, that is, the oblique diameter length, will be displayed on the screen, completing the ranging task.

[0029] Measurement method 2: Determine the head length and head width. The head length is the straight-line distance from the midpoint I between the eyebrows to the farthest point G at the back of the head, which is the straight-line length of the sagittal plane CD. The vertical plane where the midpoint I between the eyebrows and the farthest point G at the back of the head is located is defined as the cranial sagittal plane. The tip of the nose position H point is the reference point for determining the midpoint I between the eyebrows (the center of the eyebrows). The head width is the straight-line distance between the position points where the raised parts are attached to the two auricles, that is, the starting point is the position point where the raised point A is attached to the auricle (which can be determined by touch), and the end point B is the same position point on the opposite side. Determine the length of the oblique diameter, which is the straight-line distance deviating from the cranial sagittal plane, that is, the straight-line distance of the cranial intersection points when deviating 15°, 30°, and 45° to the left and right. To obtain the oblique diameter ratio, that is, the deviation slope, which is the percentage of the difference in the oblique diameter lengths divided by the lengths of the two oblique diameters, and it is one of the parameters for judging the cranial deformity state. During measurement, the lower left jaw is used as the reference position, and the raised point A of the head shape is the starting point, that is, the position point clamped by the lower left jaw is point A. The lower right jaw moves on the slideway of the lower carriage through four built-in rollers. When the lower right jaw clamps to the end point B, the value of the head width length will appear on the display screen of the digital display structure. Tighten the lower positioning screw 10, and use the following digital display measuring caliper as the reference "0" point. Then rotate the upper laser measuring caliper to be 90 degrees with the lower measuring caliper. According to the need, move the connecting rotating shaft along the length direction of the T-shaped groove of the base, so that the upper left jaw and the upper right jaw face the sagittal plane. Then slide the upper left jaw to clamp at the farthest point at the back of the head and the upper right jaw to clamp at the midpoint between the eyebrows. Turn on the laser rangefinder, and its display screen will measure and record the cranial length. Then slide the upper left and upper right jaws outward, and then rotate the upper laser measuring caliper to both sides to the required measurement angle and then stop rotating. Then slide the upper left jaw and the upper right jaw inward until they touch the head and stop. Turn on the laser rangefinder, and a ray of light will hit the lower right jaw, and at the same time the measured distance, that is, the length of the oblique diameter, will be displayed on the screen, completing the ranging task.

[0030] The present invention conducts research and development of precise measuring tools for the head structure of infants and young children, aiming to conveniently, quickly, and safely measure the parameters for making helmets. It provides precise measurement of parameters such as the head and neck slope and deviation slope for the customization of orthotic helmets, improving the measurement accuracy and also the customization accuracy of rehabilitation aids. The present invention is convenient to measure and easy to hold. Aiming at problems such as the easy movement of infants and young children, inability to concentrate, and difficulty in implementing ordinary measurement methods, it can meet the needs of infant test subjects.

Claims

1. A device for measuring the head size of a toddler, characterized in that, It includes an upper laser measuring caliper and a lower digital display measuring caliper. The upper laser measuring caliper and the lower digital display measuring caliper are connected by a connecting rotating shaft and rotate relative to each other. A digital display angle reading structure is provided at the connecting rotating shaft. The digital display angle reading structure includes an angle sensor module and a display module. The lower digital display measuring caliper includes a lower slideway frame, a lower left clamping member and a lower right clamping member; the left end of the lower slideway frame is fixedly connected to the lower left clamping member. The lower right clamping member with rollers up and down slides along the slot of the lower slideway frame. The lower right clamping jaw is provided at the protruding part of the lower slide block passing through the notch of the lower slideway frame. The lower left clamping jaw of the lower left clamping member corresponds to the lower right clamping jaw. A digital display distance measuring structure is provided on the lower slide block and the lower slideway frame; the upper laser measuring caliper includes an upper slideway frame. The upper left clamping member is slidably installed on the left side of the upper slideway frame. The folding upper right clamping member is slidably installed on the right side of the upper slideway frame. The upper left clamping member includes an upper left slide block with rollers up and down sliding along the slot of the upper slideway frame. The upper left clamping jaw and a laser distance measuring instrument are provided at the protruding part of the upper left slide block passing through the notch of the upper slideway frame. The upper right clamping member includes an upper right slide block with rollers up and down sliding along the slot of the upper slideway frame. The upper right clamping jaw is connected to the upper right clamping jaw through a self-locking folding hinge at the protruding part of the upper right slide block passing through the notch of the upper slideway frame. The upper right clamping jaw corresponds to the laser distance measuring instrument; A connecting rotating shaft is fixedly connected above the lower slideway frame. The upper part of the connecting rotating shaft passes through the upper slideway frame and fixes a grid angle sensor A. The upper slideway frame fixes a grid angle sensor B. The grid angle sensor B is connected to a display device; The measuring method of the device for measuring the head size of infants: Determine the head length and head width. The head length is the straight-line distance from the midpoint I between the eyebrows to the farthest point G at the back of the occiput. The vertical plane where the midpoint between the eyebrows and the farthest point at the back of the occiput is located is defined as the cranial sagittal plane. The tip of the nose position H point is the reference point for determining the midpoint I between the eyebrows; the head width is the straight-line distance between the position points of the raised protrusions attached to the two auricles, that is, the starting point is the position point of the raised protrusion A attached to the auricle, and the ending point B is the same position point on the opposite side; Determine the length of the oblique diameter, which is the straight-line distance deviating from the cranial sagittal plane, that is, the straight-line distance of the cranial intersection points when deviating 15°, 30°, and 45° to the left and right, so as to obtain the oblique diameter ratio, that is, the deviation slope, which is the percentage value obtained by dividing the difference in the lengths of the oblique diameters by the lengths of the two oblique diameters, and is one of the parameters for judging the cranial malformation state; During measurement, the lower left jaw is used as the reference position, and the raised protrusion A of the head shape is the initial point, that is, the position point clamped by the lower left jaw is point A. The lower right jaw moves on the lower slide rail through four built-in rollers. When the lower right jaw clamps to the ending point B, the value of the head width length will appear on the display screen of the digital display structure and be recorded. Then, slide the lower right jaw outward, release the width measurement state, rotate the measuring device, make the lower left jaw clamp at the farthest point G at the back of the occiput, and when the lower right jaw clamps to the midpoint between the eyebrows, that is, point I, read and record the data on the display screen, and lock it through the lower positioning screw of the lower digital display measuring caliper, using the lower digital display measuring caliper as the reference "0" point; Then rotate the upper laser measuring caliper to the required measuring angle to the left or right and position it, then stop rotating, and then slide the upper left jaw and the upper right jaw to perform the corresponding length measurement.

2. The device for measuring the head size of a toddler according to claim 1, wherein, The lengths of the upper right jaw and the upper left jaw are 35 cm, and the length of the lower right jaw is 30 cm.

3. The device for measuring the head size of a toddler according to claim 1, wherein The upper slide rail, the upper left clamping part, the upper right clamping part, the lower slide rail, the lower left clamping part, and the lower right clamping part are made of hard plastic, and all edges and corner structures are chamfered into smooth structures.

4. A device for measuring the head size of a young child according to the device described in claim 1, characterized in that: Taking the measurement of the oblique diameter length in the 15° direction as an example, when the upper laser measuring caliper rotates to 15° and is positioned, at this time, loosen the upper left positioning screw, and the upper left jaw can freely slide on the upper slide rail through four rollers. Stop when the upper left jaw touches one side of the head, and tighten the upper left positioning screw to achieve the positioning of one side; Open the folding upper right jaw, loosen the upper right positioning screw to realize the movement of the upper right jaw. Stop when it touches a point on the head, and tighten the upper right positioning screw, then the positioning of the other side is achieved; Turn on the laser rangefinder, and a ray of light will hit the lower right jaw, and at the same time, the measured distance, that is, the length of the oblique diameter, will be displayed on the screen, completing the ranging task at this angle.

5. A device for measuring the head size of a young child, characterized in that, It includes an upper laser measuring caliper and a lower digital display measuring caliper. The upper laser measuring caliper and the lower digital display measuring caliper are connected by a connecting rotating shaft and can rotate relative to each other. A digital display angle reading structure is provided at the connecting rotating shaft. The digital display angle reading structure includes an angle sensor module and a display module. The lower digital display measuring caliper includes a lower slideway frame, a lower left clamping member, and a lower right clamping member. The left end of the lower slideway frame is fixedly connected to the lower left clamping member. The lower right clamping member with rollers up and down slides along the slot of the lower slideway frame. The lower right clamping claw is provided at the extending part of the lower slide block passing through the notch of the lower slideway frame. The lower left clamping claw of the lower left clamping member corresponds to the lower right clamping claw. A digital display distance measuring structure is provided on the lower slide block and the lower slideway frame. The upper laser measuring caliper includes an upper slideway frame. The upper left clamping member is slidably installed on the left side of the upper slideway frame. The folding upper right clamping member is slidably installed on the right side of the upper slideway frame. The upper left clamping member includes an upper left slide block with rollers up and down sliding along the slot of the upper slideway frame. The upper left clamping claw and a laser distance measuring instrument are provided at the extending part of the upper left slide block passing through the notch of the upper slideway frame. The upper right clamping member includes an upper right slide block with rollers up and down sliding along the slot of the upper slideway frame. The upper right clamping claw is connected to the upper right slide block through a self-locking folding hinge at the extending part of the upper right slide block passing through the notch of the upper slideway frame. The upper right clamping claw corresponds to the laser distance measuring instrument. A base is installed at the top of the lower slideway frame. A T-shaped groove is opened on the base. The notch of the T-shaped groove faces upward. The lower end of the connecting rotating shaft is a hexagonal nut head. The width of the T-shaped groove is greater than or equal to the distance between the opposite sides of the hexagonal nut head and less than the circumscribed circle diameter of the hexagonal nut head. The installation gap between the wall surface of the T-shaped groove and the side wall surface of the corresponding hexagonal nut head is 0.1 to 0.2 mm. In order to ensure that the upper laser measuring caliper can only move along the length direction of the lower digital display measuring caliper driven by the connecting rotating shaft to adjust the alignment of the upper laser measuring caliper with the sagittal plane of the skull. The measuring method of the device for measuring the head size of infants and young children determines the head length and head width. The head length is the straight-line distance from the midpoint I between the eyebrows to the farthest point G at the back of the occiput. The vertical plane where the midpoint between the eyebrows and the farthest point at the back of the occiput is located is defined as the cranial sagittal plane. The position H of the tip of the nose is the reference point for determining the position I of the center of the eyebrows; the head width is the straight-line distance between the position points where the raised bumps are attached on both auricles, that is, the starting point is the position point of the raised bump A attached to the auricle, and the ending point B is the same position point on the opposite side; determine the length of the oblique diameter, which is the straight-line distance deviating from the cranial sagittal plane, that is, the straight-line distance of the intersection points of the skull when deviating 15°, 30°, and 45° to the left and right, so as to obtain the oblique diameter ratio, that is, the deviation slope, which is the percentage of the difference in the length of the oblique diameter divided by the length of the two oblique diameters, and is one of the parameters for judging the state of cranial deformity; during measurement, the lower left claw is used as the reference position, and the raised point A of the head shape is the initial point, that is, the position point clamped by the lower left claw is point A. The lower right claw moves on the lower carriage through four built-in rollers. When the lower right claw clamps to the ending point B, the numerical value of the head width will appear on the display screen of the digital display structure and be recorded; then rotate the upper laser measuring caliper, and move the connecting rotating shaft along the length direction of the base as needed, so that the left claw clamps the farthest point G at the back of the occiput, and the right claw clamps the midpoint I between the eyebrows. The cranial length will be recorded through the display screen of the laser rangefinder. Then slide the left and right claws on both sides of the upper laser measuring caliper outward, rotate the upper laser measuring caliper to the required angle value, which is read through the display screen of the angle reading structure, and then slide the left and right claws on both sides of the upper laser measuring caliper inward, corresponding to the corresponding position of the skull, and read the cranial distance at the required rotation angle position through the display screen of the laser rangefinder.

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