Waist protection cushion for maintaining pelvis stability and lumbar vertebra physiological curvature

Abstract

The invention relates to a waist protection cushion for maintaining pelvis stability and lumbar vertebra physiological curvature, and belongs to the technical field of ergonomic protectors. Through a bionic curved surface and biomechanical coupling system, the cushion solves the problems of non-physiological backward movement of lumbar vertebra, sacrum suspension, insufficient biomechanical synergy and the like caused by fixed encircling type side wings and single ischial support design of a traditional waist protection cushion, and has the core innovation points that 1, a central convex curved surface adopts a composite curvature structure, so that the shape of the central convex curved surface is more than that of the central convex curved surface, and the shape of the central convex curved surface is more than that of the central convex curved surface; a lumbosacral continuous supporting area is covered, local pressure concentration is reduced, and the lumbar vertebra physiological curvature is adapted; 2, the non-encircling side wing curved surfaces allow the waist to naturally twist and laterally bend through backward gradual curvature change, so that the degree of freedom of movement is improved; 3, according to the ischium bearing area, the outer edge of the ischium tuberosity is covered by 10-15 mm through the bidirectional diffusion design, the W-shaped transverse radian and the V-shaped longitudinal radian are matched with 90% or above of the hip shape (according to GB / T 10000-2013), and pressure distribution is improved;

Description

Technical Field

[0001] The present invention relates to the technical field of ergonomic protective gear, and in particular to a lumbar protective cushion which achieves pelvic stability and maintains the physiological curvature of the lumbar spine through a bionic curved surface and a biomechanical coupling system, and is particularly suitable for protecting the lumbar spine and pelvis of people who need to sit for a long time. Background Art

[0002] The backrests of existing lumbar support cushions mostly adopt an embracing side wing design. Although it can provide lateral support, it limits the natural movement of the human waist (such as twisting and lateral bending), and long-term use can easily lead to muscle stiffness. In addition, the ischial support area of ​​traditional cushions often adopts a flat or single arc design, which cannot adapt to different hip shapes, resulting in uneven pressure distribution, aggravating the load on the lumbar spine, and has the following defects: 1. The central lumbar support is lagging, and the embracing side wings force the lumbar spine to be in a non-physiological posterior displacement state, which cannot provide effective support: 2. The problem of sacral suspension: Most traditional cushions do not cover the sacral support area; 3. Insufficient biomechanical synergy: The ischial load-bearing area and the lumbar support components operate independently, lacking mechanical coupling, only solving the problem of a single sitting posture, and cannot meet the comprehensive support needs of the human body for the spine and muscles in different sitting postures. Summary of the invention

[0003] Technical solution: The core of the present invention is to construct a bionic dynamic coupling system, including the following innovative structures: 1. Central raised surface: a composite curvature structure is adopted, the radius of curvature of the coronal plane is consistent with the anatomical trend of the lumbar transverse process (radius R=50-80mm, citing the data of "Gray's Anatomy"), and the raised height point is located between the second and fourth lumbar vertebrae. Through bionic modeling optimization, continuous support from the first lumbar vertebra to the fifth lumbar vertebra and sacrum is achieved, and a full-fit support design is adopted for the lumbar sacral part to reduce local pressure concentration. This design is different from most products on the market that have slightly bent lumbar vertebrae and suspended sacral parts without support, and can better support the physiological curvature of the waist. 2. Dynamic side wing surface: The curvature of the side wing decreases gradually from the center to the back of both sides, and the curvature change rate matches the range of lateral bending / torsion activities of the human body to ensure the balance of support force and freedom during lateral activities. Different from the embracing backrest design on the market, this design focuses on strengthening the raised support effect of the middle lumbar sacral, and both sides can move freely, adapting to most waist dimensions. 3. Sciatic bearing area: The bidirectional diffusion surface is expanded horizontally to cover the outer edge of the projection area of ​​the ischial tuberosity by 10-15mm (according to 90% of the buttocks in GB / T 10000-2013), and the longitudinal extension is nonlinearly related to the length of the sacrum; the arc-shaped wrapping design from the ischial area to the front and back sides, the W-shaped arc design in the width and the V-shaped arc design in the longitudinal direction can adapt to most buttocks. 4. Biomechanical coupling system: The central surface and the ischial surface are linked through the mechanical interaction conduction module, and the direction of the support force is automatically adjusted when the pelvis is tilted forward / backward. The angle between the support force vector and the spinal axis is ≤15°, maintaining the safe pressure threshold of the intervertebral disc, which is better than the existing fixed-angle support design and can effectively maintain pelvic stability and lumbar physiological curvature.

[0004] Technical effects: a. Dynamic adaptability: covers 90% of adult body types in GB / T 10000-2013, providing suitable support for people of different body types. b. Multi-degree-of-freedom support: The gradient change rate of the wing curvature is improved compared with the traditional design, which directly expands the free rotation range of the waist. While supporting the waist, it does not restrict the natural movement of the waist, allowing people to twist and bend freely when using the waist support cushion. c. Mechanical synergistic optimization: The coupling system reduces the load on the lumbar spine, reduces the pressure on the spine (including the intervertebral disc) and the back, supports and protects the physiological curvature of the waist, and supports and relaxes the corresponding muscle groups. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 : Three-dimensional image of waist support cushion;

[0006] Figure 2 : Schematic diagram of the three-dimensional structure of the waist cushion (schematic diagram of the bionic lumbar sacral support backrest and the ischial bearing area);

[0007] Figure 3: Top view of the lumbar support cushion and schematic diagram of the bionic lumbar support backrest structure and coronal plane angle;

[0008] Figure 4 : The front view of the lumbar support cushion and the schematic diagram of the W-shaped ischial bearing area structure;

[0009] Figure 5 : Left view of the waist cushion and schematic diagram of the V-shaped load-bearing area structure;

[0010] Figure 6 : Three-dimensional cross-sectional view of waist support cushion;

[0011] Figure 7 : The biomechanical effect of the waist cushion is shown in the figure, and the physiological curvature from the lumbar spine to the sacrum is shown in the figure; DETAILED DESCRIPTION

[0012] Please refer to Figure 1-6 The lumbar cushion is composed of an integrally formed support frame and a buffer layer, and is divided into a lumbar-sacral support backrest (A1-A4) and a sciatic bearing area (B1-B4) that are linked up and down, and form a biomechanical coupling system; the lumbar-sacral support backrest is divided into a central raised area A1 (lumbar support area), a sacral support area A2, and lateral wing areas A3 and A4 extending backward on both sides, which together form a backrest with a gradient support structure to support the lumbar spine and sacrum; the sciatic bearing area is divided into the sciatic support center area B1, B2 and the remaining bearing areas B3, B4; the lumbar-sacral support backrest and the sciatic bearing area work together to achieve a functional structure for maintaining pelvic stability and lumbar physiological curvature.

[0013] Please refer to Figure 7 The maximum convex height point of the central convex surface corresponds to the highest point section of the lumbar physiological curvature lordosis, and the section covers the physiological curvature adaptation area from the first lumbar vertebra to the fifth lumbar vertebra.

[0014] Please refer to Figure 3 The side wing curved surfaces A3 and A4 of the backrest gradually change their curvature toward the rear, and the non-vertical angle of the side wing edge is 5-30°, realizing non-encircling side wing. It can provide local lateral support for the waist when the human body performs natural twisting, lateral bending and other activities, and meet the lateral freedom requirements of the human body in natural activity modes. The two sides are non-encircling and adapt to most waist dimensions.

[0015] Please refer to Figure 3 , Figure 7 The sagittal curvature radius of the central raised area A1 adapts to the physiological curvature of the lumbar spine, forming an elliptical paraboloid structure, and the lumbar-sacral support backrest forms a nearly vertical angle with the ischial bearing area, and the neutral sitting posture adapts to most lumbar curvatures.

[0016] Please refer to Figure 2The ischial tuberosity supporting surfaces B1 and B2 are bidirectional diffusion curved surfaces, and their lateral expansion range covers 10-15 mm of the outer edge of the ischial tuberosity projection area.

[0017] Please refer to Figure 2 , Figure 7 The lumbar joint, that is, the connection area between the fifth lumbar vertebra and the sacrum, has its own particularity in statics: the body weight on the fifth lumbar vertebra is decomposed into two forces: one force acts on the base of the sacrum, and the other force has a tendency to slide forward, just like on a slide; if the inclination of the sacral base becomes larger, the lumbar pressure increases, so the structural design of the lumbar backrest area emphasizes the importance of A1 sacral support and A2 sacral support.

Claims

1. A waist cushion for maintaining pelvic stability and lumbar vertebrae physiological curvature, characterized in that include: (a) A bionic lumbar support backrest, comprising a central convex curved surface and non-embracing side wings extending continuously to both sides and backwards, wherein the central convex curved surface presents an S-shaped continuous curvature change in the sagittal plane to adapt to the physiological curvature of the lumbar spine to the sacrum, and the direction of the curvature radius of the coronal plane is consistent with the anatomical direction of the lumbar transverse process; the non-embracing side wing curved surface has a gradual curvature change backwards to form a non-embracing side wing; (b) A sciatic bearing area, comprising a bidirectional diffusion curved surface centered on the ischial tuberosity area, and its lateral expansion angle is positively correlated with the distance between the ischial tuberosities.

2. The waist support cushion according to claim 1, characterized in that: The convex height point of the central convex curved surface is located between the second lumbar vertebra and the fourth lumbar vertebra, and the changing direction of the sagittal plane curvature radius is adapted to the physiological curvature axis of the spine.

3. The waist support cushion according to claim 1, characterized in that: The non-embracing side wing curved surface of the backrest has a gradual curvature toward the rear, and the non-vertical angle of the free edge of the side wing is 5-30 degrees.

4. The waist support cushion according to claim 1, characterized in that: The bidirectional diffusion surface of the ischial bearing area forms a W-shaped arc in the coronal plane and a V-shaped arc in the sagittal plane. The lateral expansion range covers 10-15 mm of the outer edge of the ischial tuberosity projection area, and is suitable for more than 90% of buttocks.

5. The waist support cushion according to claim 1, characterized in that: The bionic lumbar support backrest cooperates with the ischial bearing area to control the dynamic change of the lumbar lordosis angle in the pelvic forward tilt / backward tilt state.

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