US2423622A - Sesamoid-cuboid foot balancer - Google Patents

Description

y 1947. H 1.. SAMBLANET 2,423,622

SESAMOID-CUBOID FOOT BALANCER Filed Oct. 2, 1945 W\ 29 INVENTOR.

Fly 3 Hegnan LSamblanei ATTORNEYS Patented July 8, 1947 UNITED STATES TENT OFFICE SESAMOID-CUBOID FOOT BALANCER Herman L. S'amblanet, Canton, Ohio Application October 2, 1945, Serial No. 619,780,

3 Claims. 1

The invention relates generally to means for correcting foot abnormalities, andfor maintaining the foot in normal posture andbalance. More specifically, theinvention relatesto a novel insole constructed to support the foot in such manner as to restore and maintainall of its parts in normal healthy condition in which they function properly with natural freedom.

There have been many arch supports designed to fit or be located under the internal longitudinal arch of the foot, but most of such supports cause pressure on the soft fleshy under'part of the arch where the muscles, vessels and nervesare" located. Nature did not intend these soft structures to carry weight, but rather, located them on the under part of the internal arch to protect them from being compressed.

Numerous other foot supports which have been proposed, have padsor elevated portions under various parts of the foot, as for example, under the s calcis, the cuboid, and extending laterally under the heads of the metatarsals; but all of these prior supports have failed to recognize the fundamental requirements of the normal foot.

I have determined that the three most important factors in foot ease and health are posture, balance; and freedom of movement of the various parts. I have discovered that the most important points of support, for maintaining the foot in proper posture and balance-during walking and standing, are, the distal or front abutment of the internal longitudinal arch, andthe external abutment of the transverse arch.

The distal abutment of the internalarch is at or justbehind'thehead of thefirst metatarsal, and actually on the two small sesamoid boneslocated at the head of the first metatarsal, which sesamoid bones act as rounded bearing pointsfor the front end of the internal longitudinal arch during walking and standing. The external abutment of the'transverse tarsal arch is the cuboid bone which supports the outer end of the transverse arch formed'by the three cuneiform bones and the cuboid.

Many painful foot ailments are caused by failme of oneor both of these points of support to function properly. For example, if the first metatarsal bone is too short, callouses may form at the heads of the second and third metatarsals' because they try to supply the bearing support normally'provided by the sesamoids on the first metatarsal. This shortness of the first metatarsalmay also cause depression of. the internal longitudinal archdue to internal rotation of the foot.

Other foot ailments which may occur because of improper functioning of these points ofsuppor-t include-bunions on the great toe, corns on the fourth and fifth toes due primarily todropping and rotating of the-cuboid bone, eversionor turn ing outwardly of the foot on a verticalaxis, external rotation of the os calcis, and many attendant achesand pains-due to the foot strains caused by any or-all of the foregoing conditions.

Accordingly, it is a general object of the present invention to provide novel foot supportin means which will restore and maintain-natural foot-pos-- ture, balance and freedom. I

A more specific object'is to provide a novel insole construction adapted to be worn in-any type of shoe or slipper, which will tend to restore and maintain natural foot posture, balance and freedom.

Another object is;to"provide a novel footsupport .whichhaselevated means under the sesamoid bones of the great toe and elevated means under the cuboid bone.

A further object i toprovide. anovel insole adapted to be worn in any type of shoe orslipper, and. having soft rubber pads located under the sesamoid bones of the great. toe and under the: cuboid bone.

These and other objects are accomplished'by the parts, improvements, constructions and arrangements comprising the present invention,.a preferred embodiment of which is shown by way of example in the accompanying drawing; and which is hereinafter described in detail and setforth in the appended claims.

Referring to the drawing forming part hereof,

Figure 1 is a plan view of the skeleton of a human foot, with the improved insole of the invention positioned thereunder, the outline of the sole of the shoe in which the insole is located being shown in dot-dash lines;

Fig. 2 is a side elevation thereof looking toward the internal longitudinal'arch of the foot; and

Fig. 3 is a longitudinal sectional view taken substantially on line 3-3, of Fig. 1.

Similar materials refer to similar parts throughout the several views of the drawing.

The skeleton ofa right foot is shown somewhat diagrammatically in the drawings, being patterned along the lines of an X-ray photograph, and no attempt has been made to show the fleshy parts of the foot or how the foot fits within the upper part of a standard shoe, the shoe sole being outlined merely to give a general idea of its position" relative to thefo'ot skeleton andito the;

improved insole:

As shown, the skeleton includes theastragalus bone 5 on which the leg bones are supported, the os calcis ii, thescaphoid 7, thecuneiforms 8, 9 and I and cuboid H, the metatarsals l2, l3, [4, I and IS, the proximal phalanges ll, i8, I9, 28 and 2|, and the distal phalanges ll, l3, i9, 253 and 21' respectively.

The internal longitudinal arch of the foot is formed by the first metatarsal i2, the internal cuneiform B, the scaphoid I, theastragalus 5 and theos calcis 6. Thus the head of the first metatarsal l2 forms the front abutment of the internal longitudinal arch, and the os calcis or heel bone provides the rear abutment.

The external longitudinal arch of the foot is formed by the fourth and fifth metatarsals i5 and IS, the cuboid H and the os calcis .6; the heads of the fourth andfifth metatarsals 29 and 2| forming the front abutment of this arch, and

the 0s calcis forming the rear abutment thereof.

The transverse tarsal arch is formed by thecuneiform bones 8, 9 and If], and the cuboid H, the cuboid being the external abutment for this arch. Since the internal abutment of the transverse tarsal arch is theinternal cuneiform 8 which is part of the internal longitudinal arch, and the external abutment of the transverse tarsal arch is the cuboid H, which is part of the external longitudinal arch; it is obvious that a dropping or rotation or displacement of the cuboid bone will effect the posture and function of all three arches. Accordingly, my novel and improvedinsole 22 is provided with an elevated pad or raisedportion 23 which is located directly beneath the cuboid H to provide a support therefor.

The improvedinsole 22 is preferably constructed on its underside with resilient material such as sponge rubber, as indicated at 24, with athin liner 25 of leather and the like adhering to the upper surface of the sponge rubber. As shown theheel portion 26 of the insole is rounded to conform to the shape of an ordinary shoe sole and is substantially hat on its upper surface. Theinsole 22 extends forwardly from the heel portion in substantial conformance with the shoe sole 2'! and terminates on its inner side in afront portion 28 in front of the joint between the first metatarsal I2 and the proximal phalang i? of the great toe. On the outer side the front portion of the insole may be cut back as at 2% so as to terminate substantially under the heads of the third, fourth and fifth metatarsals I4, l5 and it respectively.

As indicated in Figs. 1 and 2, the head of the first metatarsal i2 is provided immediately behind its joint with the phalange H with two laterally spaced sesamoid bones 36 and 36. These bones are attached to the, underside of the head of the metatarsal i2 and form rounded or ball bearing points for supporting the front end of the internal longitudinal arch during standing and walking. The improved insole is provided with a raised portion orpad 32 which may be substantially rectangular in plan, which is adapted to be positioned directly beneath the sesamoid bones 3i) and 3|, and thepad 32 has sufiicient length to allow for some sliding movement of the sesamoids during Walking.

Thepads 32 and 23 are preferably formed by increasing the thickness of thesponge rubber 24%, but if desired the pads may be of semi-resilient or non-resilient material in order to correct certain foot abnormalities. Likewise, the material 4 of the body of the insole may be varied to suit conditions.

Accordingly, if the second and third metatarsals it or i i are too long or the first metatarsal i2 is too short, front abutments of the internal longitudinal arch will occur at the heads of the metatarsals l3 and 14 instead of at the head of the first metatarsal i2, which may cause callouses at those points and may cause imbalance and internal rotation of the foot resulting in a depressed internal arch, and other related ailments. Thepad 32 tends to elevate th internal longitudinal arch by raising the front or distal abutment thereof, thus preventing or alleviating internal rotation of the foot or a depressed internal arch.

Thepad 23 supports the external longitudinal a arch and the transverse tarsal arch by providing an elevated support for the cuboid, and thus tends to prevent dropping or rotating of the cu boid which may cause strain on thefourth and fifth metatarsals, resulting in Mortons toe or kindred ailments.

The combination of the elevatedpads 23 and 32 provides supports at the two most important abutments of the three arches of the foot, and results in the maintenance of the three most important factors in foot ease and health, namely,

posture, balance and freedom of movement.

Thus, the novel insole provides a sesamoid-cuboid foot balancer which tends to force the weight of the body to be carried primarily over the external longitudinal arch of the foot while standing and walking, which is the normal func tion of the external arch. The novel insole tends to prevent or alleviate 'eversion of the foot and external rotation of the os calcis, with attendant strain of the muscles andtendons, and tends to prevent or alleviate the formation of corns; bunions and callouses and to relieve the many aches and pains due to abnormal foot strains, without causing pressure on any of the soft tissue of the foot.

In using the novel and improved insole, it is necessary that it be carefully designed and c0nstructed to fit accurately the particular foot under which ity is to be worn, careful attention being paid to the accurat positioning of thepads 32 and '23 under the sesamoids and the cuboid of the particular foot. Moreover, the condition-of the foot as-to ailments and abormalities should be diagnosed by a foot specialist, so that the relative thickness of thepads 32 and 23 is designed properly to .correct or alleviate the same-- I have found in actual practice that while certain abnormalities and ailments of the foot can be temporarily alleviated or relieved by proper manipulation and treatment tending to restore the foot to proper balance, posture and freedom of movement; such relief is at best only temporary and the weaknesses and abnormalities constantly tend to return the foot to its unhealthy and painful condition.

I have found in actual prac'tice'with a large number of patients, that the use of the novel and improved insole comprising the present invention produces remarkable results, not only in maintaining th foot in proper posture and balance after manipulation and treatment, but also in strengthening and restoring the various parts of the foot through'continued wear, so as to ultimately restore it to a healthy and normal condition.

The novel insole is simple and inexpensive to manufacture, and is adapted to be easily in;

serted and worn in any type of ordinary shoe,

sandal or slipper.

In the foregoing description, certain terms have been used for brevity, clearness and understanding; but no unnecessary limitations are to be implied therefrom beyond the requirements of the prior art, because such words are used for descriptive purposes herein and are intended to be broadly construed.

Moreover, the embodiments of the improved construction illustrated and described herein is by way of example, and the scope of the present invention is not limited to the exact details, the constructions comprising the invention, and reasonable mechanical equivalents thereof obvious to those skilled in the art, being set forth in the appended claims.

I claim:

1. A shoe insole for maintaining a foot in proper posture and balance, having a fiat elevated portion located directly under and bearing primarily n the sesamoid bones of the first metatarsal, and a separate elevated portion located under only the cuboid bone of said foot, said insole being otherwise substantially flat.

2. A shoe insole for maintaining a foot in proper posture and balance, having a fiat elevated HERMAN L. SAMBLANE-T.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,103,627 Mirenta Dec. 28, 1937 2,287,341 Burns June 23, 1942 730,366 Gunthorp June 9, 1903 1,808,461 Gregorek June 2, 1931 2,106,508 Shaw Jan. 25, 1938

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