SEPARATED PROSTHETIC FOOT WITH TRANSVERSE ARCH

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.

Claims

1. A separated prosthetic foot with a transverse arch comprising: a sole curved plate, a heel curved plate, a connecting piece, a first screw and post set, a second screw and post set, a first rubber gasket, a first bolt, a second bolt and a second rubber gasket; wherein the sole curved 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 third rear arc part, a fourth rear arc part, a third middle transition part, a middle fourth transition part and a front flat-folded plate part; the third rear arc part, the fourth rear arc part, the third middle transition part, the fourth middle transition part and the front flat-folded pate part are smoothly connected into a whole unit in sequence from back to front; the third rear arc part is provided with a third rear hole and a fourth rear hole, the fourth rear arc part is provided with a third front hole and a fourth front hole; the third rear arc part and the fourth rear arc part 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; the front flat-folded plate part is controlled by a fold line which is formed by connecting two straight lines having a height difference of 2 mm through arc smooth transition, and the shapes of the third middle transition part and the fourth middle transition part change from arc transition to straight, and the curvature changes from a large radius of curvature to a small radius of curvature; the lower carbon fiber curved plate consists of a first rear arc part, a second rear arc part, a first middle transition part, a second middle transition part and a front flat plate part; the first rear arc part, the second rear arc part, the first middle transition part, the second middle transition part and the front flat plate part are smoothly connected into a whole unit in sequence from back to front; the first rear arc part is provided with a first rear hole and a second rear hole, and the second rear arc part is provided with a first front hole and a second front hole, wherein the first rear arc part and the second rear arc part are arc curved surfaces having a uniform curvature which is greater than the curvature of the third rear arc part and the fourth rear arc part, 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-folded plate part; the shapes of the first middle transition part and the second middle transition part change from arch transition to straight, and the curvature changes from a large radius of curvature to a small radius of curvature; the upper carbon fiber curved plate is located one 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-folded plate part of the upper carbon fiber curved plate; the first rear hole, the second rear hole, the first front hole and the second front hole respectively correspond to the second rear hole, the fourth rear hole, the third front hole and the fourth front hole up and down in sequence; the upper carbon fiber curved plate and the lower carbon fiber curved plate are integrally controlled by a sole longitudinal curve in a front-back direction, the sole longitudinal curve consists of a first sole longitudinal curve section and a second sole longitudinal curve section, and the first sole longitudinal curve section is a straight line section with an inclination angle ranging from 18 degrees to 20 degrees; the second sole longitudinal curve section 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 second sole longitudinal curve section is located at the front part of the sole longitudinal curve, and the first sole longitudinal curve section and the second sole longitudinal curve section are in smooth and tangent connection; the heel curved plate consists of a top arc part, a first middle buffering transition part, a second middle buffering transition part and a bottom flat plate part; the top arc part, the first middle buffering transition part, the second middle buffering transition part and the bottom flat plate part are smoothly connected into a whole unit 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 an central angle of 40 to 50 degrees, and the top arc part is provided with a first through hole and a second through hole; the bottom flat plate part is a straight plate having a width greater than that of the top arc part; the shapes of the first middle buffering transition part and the second middle buffering transition part change from arc smooth transition to straight, the curvature changes from a large radius of curvature to a small radius of curvature, such that the heel curved plate is fan-shaped; during the transition from the top arc part to the bottom flat plate part, the thickness of the heel curved plate changes from 4 mm to 2.5 mm; the heel curved plate is integrally controlled by a heel longitudinal curve in a front-back direction, and the heel longitudinal curve consists of a first heel longitudinal curve section, a second heel longitudinal curve section and a third heel longitudinal curve section; the first heel longitudinal curve 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 second heel longitudinal curve 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 third heel longitudinal curve section is a straight line with an inclination angle of 18 to 20 degrees; the first heel longitudinal curve section, the second heel longitudinal curve section and the third heel longitudinal curve section are in smooth and tangent connection in sequence from back to front; the connecting piece, the upper carbon fiber curved plate of the sole curved plate, the lower carbon fiber curved plate of the sole curved plate and the second rubber gasket are sequentially arranged from bottom to top; the heel curved plate, the lower carbon fiber curved plate and the upper carbon fiber curved plate of the sole curved plate and the connecting piece are sequentially arranged from bottom to top; wherein the second rubber gasket is positioned below the rear part of the lower carbon fiber curved plate, and second the rubber gasket, the rear parts of the lower carbon fiber curved plate and the upper carbon fiber curved plate in the sole curved plate and the bottom surface of a main body of the connecting piece are fixedly connected by a first bolt and a second bolt; the first rubber gasket is positioned below the front part of the heel curved plate; the first rubber gasket, the front part of the heel curved plate, and the middle parts of the lower carbon fiber curved plate and the upper carbon fiber curved plate in the sole curved plate are fixedly connected by the first screw and post set and the second screw and post set; the bottom surface of the main body in the connecting piece is the same as the arc curved surface of the third rear arc part of the upper carbon fiber curved plate in the sole curved plate in size.

2. The separated prosthetic foot with the transverse arch according to claim 1, wherein the connecting piece consists of a square conical head and the main body; the middle of the main body is provided with a cavity, the bottom end of the main body is provided with a first threaded hole and a second threaded hole; 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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is an axonometric view (rear right direction) of a separated prosthetic foot with a transverse arch;

[0014] FIG. 2 is an axonometric view (front right direction) of a separated prosthetic foot with a transverse arch;

[0015] FIG. 3 is an axonometric view (right bottom direction) of a separated prosthetic foot with a transverse arch;

[0016] FIG. 4 is an exploded view (front right direction) of a separated prosthetic foot with a transverse arch;

[0017] FIG. 5 is an axonometric view (front right direction) of a segmented section of an upper carbon fiber curved plate 8;

[0018] FIG. 6 is an axonometric view (front right direction) of a segmented section of a lower carbon fiber curved plate 7;

[0019] FIG. 7 is an axonometric view (front right direction) of a segmented section of a heel curved plate B;

[0020] FIG. 8 is a right view of a sole longitudinal curve D and a heel longitudinal curve E;

[0021] FIG. 9 is an axonometric view (front right direction) of a connecting piece;

[0022] In the drawings: A—sole curved plate; B—heel curved plate; C—connecting piece; D—sole longitudinal curve; E—heel longitudinal curve; 1—first screw and post set; 2—second screw and post set; 3—first rubber gasket; 4—first bolt; 5—second bolt; 6—second rubber gasket; 7—lower carbon fiber curved plate; 7a—first rear arc part; 7b—second rear arc part; 7c—first middle transition part; 7d—second middle transition part; 7e—front flat plate part; 7f—second front hole; 7g—first front hole; 7h—second rear hole; 7i—first rear hole; 7j—first sole longitudinal curve section; 7k—second sole longitudinal curve section; 8—upper carbon fiber curved plate; 8a—third rear arc part; 8b—fourth rear arc part; 8c—third middle transition part; 8d—fourth middle transition part; 8e—front flat-folded plate part; 8f—fourth front hole; 8g—third front hole; 8h—fourth rear hole; 8i—third rear hole; 9a—top arc part; 9b—first middle buffering transition part; 9c—second middle buffering transition part; 9d—bottom flat plate part; 9e—first through hole; 9f—second through hole; 9g—first heel longitudinal curve section; 9h—second heel longitudinal curve section; 9i—third heel longitudinal curve section; 10a—square conical head; 10b—main body; 10c—first threaded hole; 10d—second threaded hole; 10e—cavity.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following describes the present disclosure with reference to the accompanying drawings.

[0024] As shown in FIG. 1 to FIG. 4, a separated prosthetic foot with a transverse arch comprises a sole curved plate A, a heel curved plate B, a connecting piece C, a first screw and post set 1, a second screw and post set 2, a first rubber gasket 3, a first bolt 4, a second bolt 5, and a second rubber gasket 6. The connecting piece C, an upper carbon fiber curved plate 8 of the sole curved plate A, a lower carbon fiber curved plate 7 of the sole curved plate A, and the second rubber gasket 6 are sequentially arranged from bottom to top; the heel curved plate B, the lower carbon fiber curved plate 7 and the upper carbon fiber curved plate 8 of the sole curved plate A and the connecting piece are sequentially arranged from bottom to top, wherein the second rubber gasket 6 is located below the rear part of the lower carbon fiber curved plate 7; the second rubber gasket 6, the rear parts of the lower carbon fiber curved plate 7 and the upper carbon fiber curved plate 8 of the sole curved plate A and the bottom surface of a main body 10b of the connecting piece C are fixedly connected by the first bolt 4 and the second bolt 5; the first rubber gasket 3 is located below the front part of the heel curved plate B; the first rubber gasket 3, the front part of the heel curved plate B, and the middle parts of the lower carbon fiber curved plate 7 and the upper carbon fiber curved plate 8 of the sole curved plate A are fixedly connected by the second screw and post set 1 and the second screw and post set 2. The bottom surface of the main body 10b in the connecting piece C is the same as the arc curved surface of the third rear arc part 8a of the upper carbon fiber curved plate 8 in the sole curved plate A in size.

[0025] As shown in FIG. 5, FIG. 6 and FIG. 8, the sole curved plate A consists of the upper carbon fiber curved plate 8 and the lower carbon fiber curved plate 7; the upper carbon fiber curved plate 8 consists of a third rear arc part 8a, a fourth rear arc part 8b, a third middle transition part 8c, a fourth middle transition part 8d and a front flat-folded plate part 8e; the third rear arc part 8a, the fourth rear arc part 8b, the third middle transition part 8c, the fourth middle transition part 8d and the front flat-folded plate part 8e are smoothly connected into a whole unit in sequence from back to front; the third rear arc part 8a is provided with a third rear hole 8i and a fourth rear hole 8h, the fourth rear arc part 8b is provided with a third front hole 8g and a fourth front hole 8f The third rear arc part 8a and the fourth rear arc part 8b 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; the front flat-folded plate part 8e is controlled by a fold line which is formed by connecting two straight lines having a height difference of 2 mm through arc smooth transition; the shapes of the third middle transition part 8c and the fourth middle transition part 8d change from arc transition to straight, and the curvature changes from a large radius of curvature to a small radius of curvature; the lower carbon fiber curved plate 7 consists of a first rear arc part 7a, a second rear arc part 7b, a first middle transition part 7c, a second middle transition part 7d and a front flat plate part 7e. The first rear arc part 7a, the second rear arc part 7b, the first middle transition part 7c, the second middle transition part 7d and the front flat plate part 7e are smoothly connected into a whole unit in sequence from back to front; the first rear arc part 7a is provided with a first rear hole 7i and a second rear hole 7h, and second the rear arc part 7b is provided with a first front hole 7g and a second front hole 7f, wherein the first rear arc part 7a and the second rear arc part 7b are arc curved surfaces having a uniform curvature which is greater than the curvature of the third rear arc part 8a and the fourth rear arc part 8b, a circular arc radius of 35 to 40 mm, and a central angle of 55 to 65 degrees. The front flat plate part 7e is a flat plate, and the area of the front flat plate part is smaller than that of the front flat-folded plate part 8e; the shapes of the first middle transition part 7c and the second middle transition part 7d change from arc transition to straight, and the curvature changes from a large radius of curvature to a small radius of curvature; the upper carbon fiber curved plate 8 is located one the lower carbon fiber curved plate 7. The bottom surface of the upper carbon fiber curved plate 8 is in contact with the top surface of the lower carbon fiber curved plate 7, and the front flat plate part 7e of the lower carbon fiber curved plate 7 is embedded in the front flat-folded plate part 8e of the upper carbon fiber curved plate 8. The first rear hole 7i, the second rear hole 7h, the first front hole 7g and the second front hole 7f respectively correspond to the third rear hole 8i, the fourth rear hole 8h, the third front hole 8g and the fourth front hole 8f up and down in sequence. The upper carbon fiber curved plate 8 and the lower carbon fiber curved plate 7 are integrally controlled by a sole longitudinal curve D in a front-back direction. The sole longitudinal curve D consists of a first sole longitudinal curve section 7j and a second sole longitudinal curve section 7k, and the first sole longitudinal curve section 7j is a straight-line section with an inclination angle ranging from 18 degrees to 20 degrees. The second sole longitudinal curve section 7k 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 second sole longitudinal curve section 7k is located at the front part of the sole longitudinal curve D, and the first sole longitudinal curve section 7j and the second sole longitudinal curve section 7k are in smooth and tangent connection.

[0026] As shown in FIG. 7 and FIG. 8, the heel curved plate B consists of a top arc part 9a, a first middle buffering transition part 9b, a second middle buffering transition part 9c and a bottom flat plate part 9d. The top arc part 9a, the first middle buffering transition part 9b, the second middle buffering transition part 9c and the bottom flat plate part 9d are smoothly connected into a whole piece in sequence from front to back. The top arc part 9a 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 9a is provided with a first through hole 9e and a second through hole 9f The bottom flat plate part 9d is a straight plate having a width greater than that of the top arc part 9a; the shapes of the first middle buffering transition part 9b and the second middle buffering transition part 9c change from arc smooth transition to straight, the curvature changes from a large radius of curvature to a small radius of curvature, such that the heel curved plate is fan-shaped. During the transition from the top arc part 9a to the bottom flat plate part 9d, the thickness of the heel curved plate changes from 4 mm to 2.5 mm. The heel curved plate B is integrally controlled by a heel longitudinal curve E in a front-back direction, and the heel longitudinal curve E consists of a first heel longitudinal curve section 9g, a second heel longitudinal curve section 9h and a third heel longitudinal curve section 9i; the first heel longitudinal curve section 9g is a downward convex arc having an arc radius of 70 to 75 mm and a central angle of 38 to 42 degrees. The second heel longitudinal curve section 9h is an upward convex arc having an arc radius of 35 to 40 mm and a central angle of 55 to 60 degrees; the third heel longitudinal curve section 9i is a straight line with an inclination angle of 18 to 20 degrees; the first heel longitudinal curve section 9g, the second heel longitudinal curve section 9h and the third heel longitudinal curve section 9i are in smooth and tangent connection in sequence from back to front.

[0027] As shown in FIG. 9, the connecting piece C consists of a square conical head 10a and the main body 10b, wherein the middle of the main body 10b is provided with a cavity 10e, the bottom end of the main body 10b is provided with a first threaded hole 10c and a second threaded hole 10d; the square conical head 10a is fixedly connected to the center of the upper end of the main body 10b, the bottom surface of the main body 10b is an arc curved surface having an arc radius of 65 to 70 mm and a central angle of 65 to 75 degrees.