Separated prosthetic foot with transverse arch

Patent metadata

Field	Value
Publication number	US-12082647-B2
Application number	US-202217807191-A
Country	US
Kind code	B2
Filing date	Jun 16, 2022
Priority date	Jun 16, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A separated prosthetic foot with a transverse arch belongs to the technical field of manufacturing of artificial limbs. The characteristics of the transverse arch of the human foot are combined into the previous transverse-straight carbon fiber foot design to improve the stiffness of the prosthetic foot and reduce the weight of the prosthetic foot. A forefoot part employs a separated curved plate design, and two simple curved plates with different curvatures are used for simulating a complex curved surface of the transverse arch of the human, such that the manufacturing cost is reduced, and the various parts of the sole are non-uniform in stiffness distribution: the outer side of the foot is a single-layer forefoot plate with a smaller curvature and minor stiffness; and the inner side of the foot is a double-layer stacked forefoot plate, and the lower layer plate has a large radius in curvature and stiffness.

First claim

What is claimed is:

1. A separated prosthetic foot with a transverse arch, consisting of a curved sole plate, a curved heel plate, a connecting piece consisting of a square conical head and a main body, a screw and post set I, a screw and post set II, a rubber gasket I, a bolt I, a bolt II and a rubber gasket II, wherein the curved sole plate consists of an upper carbon fiber curved plate and a lower carbon fiber curved plate; the upper carbon fiber curved plate consists of a rear arc part III, a rear arc part IV, a middle transition part III, a middle transition part IV and a front flat polygonal plate part; the rear arc part III, the rear arc part IV, the middle transition part III, the middle transition part IV and the front flat polygonal plate part are smoothly connected into a whole in sequence from back to front; the rear arc part III is provided with a rear hole III and a rear hole IV, the rear arc part IV is provided with a front hole III and a front hole IV; the rear arc part III and the rear arc part IV are both arc curved surfaces having a uniform curvature, an arc radius of 65 to 70 mm, and a central angle of 70 to 80 degrees; profile of the front flat polygonal plate part is defined by a polygonal line which is formed by connecting two straight lines having a height difference of 2 mm through arc smooth transition; the shapes of the middle transition part III and the middle transition part IV transition from an arc to a straight shape, and the curvature decreases; the lower carbon fiber curved plate consists of a rear arc part I, a rear arc part II, a middle transition part I, a middle transition part II and a front flat plate part; the rear arc part I, the rear arc part II, the middle transition part I, the middle transition part II and the front flat plate part are smoothly connected into a whole in sequence from back to front; the rear arc part I is provided with a rear hole I and a rear hole II, and the rear arc part II is provided with a front hole I and a front hole II, wherein the rear arc part I and the rear arc part II are arc curved surfaces having a uniform curvature which is greater than the curvature of the rear arc part III and the rear arc part IV, a circular arc radius of 35 to 40 mm, and a central angle of 55 to 65 degrees; the front flat plate part is a flat plate, and the area of the front flat plate part is smaller than that of the front flat polygonal plate part; the shapes of the middle transition part I and the middle transition part II transition from an arc to a straight shape, and the curvature decreases; the upper carbon fiber curved plate is located on the lower carbon fiber curved plate, the bottom surface of the upper carbon fiber curved plate is in contact with the top surface of the lower carbon fiber curved plate, and the front flat plate part of the lower carbon fiber curved plate is embedded in the front flat polygonal plate part of the upper carbon fiber curved plate; the rear hole I, the rear hole II, the front hole I and the front hole II respectively correspond to the rear hole III, the rear hole IV, the front hole III and the front hole IV vertically in sequence; curvatures of the upper carbon fiber curved plate and the lower carbon fiber curved plate in a front-back direction are generally defined by a sole longitudinal curve, the sole longitudinal curve consists of a sole longitudinal curve section I and a sole longitudinal curve section II, and the sole longitudinal curve section I is a straight line section with an inclination angle ranging from 18 degrees to 20 degrees; the sole longitudinal curve section II is a section of downward convex arc having an arc radius of 230 to 240 mm and a central angle of 20 to 22 degrees; the sole longitudinal curve section II is located at the front part of the sole longitudinal curve, and the sole longitudinal curve section I and the sole longitudinal curve section II are in smooth and tangent connection; the curved heel plate consists of a top arc part, a middle buffering transition part I, a middle buffering transition part II and a bottom flat plate part; the top arc part, the middle buffering transition part I, the middle buffering transition part II and the bottom flat plate part are smoothly connected into a whole in sequence from front to back; the top arc part is a curved surface having a straight line in a front-back direction and an arc in a left-right direction, and having an arc radius of 30 to 35 mm and a central angle of 40 to 50 degrees, and the top arc part is provided with a through hole I and a through hole II; the bottom flat plate part is a straight plate having a width greater than that of the top arc part; the shapes of the middle buffering transition part I and the middle buffering transition part II transitions from an arc to a straight shape, the curvature decreases, the width increases, such that the curved heel plate is fan-shaped; during the transition from the top arc part to the bottom flat plate part, the thickness of the curved heel plate changes from 4 mm to 2.5 mm; curvature of the curved heel plate in a front-back direction is generally defined by a heel longitudinal curve, and the heel longitudinal curve consists of a heel longitudinal curve section I, a heel longitudinal curve section II and a heel longitudinal curve section III; the heel longitudinal curve I section is a downward convex arc having an arc radius of 70 to 75 mm and a central angle of 38 to 42 degrees; the heel longitudinal curve II section is an upward convex arc having an arc radius of 35 to 40 mm and a central angle of 55 to 60 degrees; the heel longitudinal curve section III is a straight line with an inclination angle of 18 to 20 degrees; the heel longitudinal curve I section, the heel longitudinal curve II section and the heel longitudinal curve III section are in smooth and tangent connection in sequence from back to front; the connecting piece (C), the upper carbon fiber curved plate of the curved sole plate, the lower carbon fiber curved plate of the curved sole plate and the rubber gasket II are sequentially arranged from bottom to top; the curved heel plate, the lower carbon fiber curved plate and the upper carbon fiber curved plate of the curved sole plate and the connecting piece (C) are sequentially arranged from bottom to top; wherein the rubber gasket II is positioned below the rear part of the lower carbon fiber curved plate, and the rubber gasket II, the rear parts of the lower carbon fiber curved plate and the upper carbon fiber curved plate in the curved sole plate and the bottom surface of the main body are fixedly connected by a bolt I and a bolt II; the rubber gasket I is positioned below the front part of the curved heel plate; the rubber gasket I, the front part of the curved heel plate, and the middle parts of the lower carbon fiber curved plate and the upper carbon fiber curved plate in the curved sole plate are fixedly connected by the screw and post set I and the screw and post set II; the bottom surface of the main body is the same as the arc curved surface of the rear arc part III of the upper carbon fiber curved plate in the curved sole plate in size.

2. The separated prosthetic foot with the transverse arch according to claim 1 , wherein the middle of the main body is provided with a cavity, the bottom end of the main body is provided with a threaded hole I and a threaded hole II; the square conical head is fixedly connected to the center of the upper end of the main body, the bottom surface of the main body is an arc curved surface having an arc radius of 65 to 70 mm and a central angle of 65 to 75 degrees.

Assignees

• Univ Jilin

Inventors

• Wang Kunyang
• Ren Lei
• Qian Zhihui
• Liang Wei
• Xue Yifeng
• Lu Xuewei
• Xiu Haohua
• Ren Luquan

Classifications

• A61F2/66 Primary

  Feet; Ankle joints · CPC title

• A43B13/34

  Soles also attached to the inner side of the heels · CPC title

• A43B3/246

  characterised by the sole · CPC title

• A43B3/24

  Collapsible or convertible · CPC title

• A61F2002/6664

  Dual structures made of two connected cantilevered leaf springs · CPC title