Protective Orthopedic Device

This invention relates generally to orthopedic support devices and more particularly to an elastic support having articulated lateral supports inserted therein.

The knee is the largest joint of the body and must support the entire weight of the upper body during the normal course of walking or running. Injuries to the knee are serious, due not only to the fact that the knee plays a major part in the normal human gait but, since the knee must support great stresses, such stresses may aggravate any injury and prolong the healing process, unless the injured person can keep all weight off the knee as, for example, by using crutches or remaining in traction until healing is completed.

Some activities place greater stresses on the knee than others, as for example the types of stresses experienced in athletic participation and competition. Such stresses may produce no problems for a sound knee; however, any injury producing a lasting residual result may leave the injured person with a chronic condition in which the knee, when placed under large or unusual stresses, may dislocate or "lock". Such a condition generally requires use, by the injured person, of some type of supportive device during those times that the person anticipates the knee will be placed under unusual stresses. Common examples are the supportive devices worn by basketball players and skiers to prevent the knee from dislocating while at the same time assuring, to as great a degree as possible, a full range of flexibility and mobility of the knee joint. Such supportive devices may also be of use while recovering from knee injuries during which support and protection of the knee joint aids in proper and correct healing.

Previous supportive devices have made extensive use of heavy duty elastic material to provide support for the knee and to reduce swelling while attempting to permit full articulation of the knee joint. Such devices, however, furnish little or no effective lateral protection or support. Other appliances may feature pivotally hinged external metallic frameworks attached at their free end to bands or cuffs which may be strapped or buckled above and below the knee. While such divices may provide some degree of lateral support and may reduce the amount of force exerted on the knee during walking motions, such devices have generally been uncomfortable, unsightly and next to impossible to wear under clothing. Thus the need exists for an improved knee support device which provides full lateral support in a compact and comfortable configuration.

Accordingly, this invention has the following objects :

To provide orthopedic devices which supply lateral support to a joint of the body;

To provide such devices in forms which are comfortable to wear and which do not hamper normal joint articulation;

To provide such devices in forms streamlined enough to be worn under clothing;

To provide such devices in forms relatively inexpensive to manufacture and convenient to apply; and

To provide such devices in forms sized to accommodate a wide range of limb sizes and configurations.

These and further objects will become more apparent upon consideration of the accompanying drawings in which:

FIG. 1 is a side elevation of the orthopedic device of the subject invention;

FIG. 2 is side elevation of the device in FIG. 1 with the side channels partially broken away to expose the stay and the articulated brace member;

FIG. 3 is a side elevation of the brace member in an articulated attitude;

FIG. 4 is a side elevation of the member of FIG. 3 illustrating the relative proportions of the individual links;

FIG. 5 is a view along 5--5 of FIG. 4;

FIG. 6 is a front elevation of the device of FIG. 1 illustrating the positioning of the articulated brace members;

FIG. 7 is a front view of the brace member of FIG. 3 with lateral force F applied thereto; and

FIG. 8 is a front view illustrating the effect of force F on the stay of FIG. 2.

Consistent with the foregoing objects, applicant herein provides a protective orthopedic device for joints of the body, with tubular elastic support means 11 having axially peripherally extending sleeve means 14 and 16 formed therein. Stay 15 is inserted in channel 14 and articulated brace member 17 is inserted in channel 16 whereby said orthopedic device articulates fully in the normal direction of articulation of the joint, yet which resists forces lateral to said direction, as exemplified by Force F.

Referring now to FIG. 1, the numeral 10 indicates generally a knee support device which, in this embodiment, includes a somewhat tubular elastic support 11 having inner support pads 12 and patellar opening 13.

Tube 11 has stitched along each of its sides stay channels 14 into which are inserted spring steel members 15, and brace channels 16 into which are inserted articulated brace members 17, as illustrated in FIG. 2. Such tubular elastic support members are well known in the art, however, heretofore such support members have utilized only spring steel inserts whose primary function has been to enable the supportive device to maintain its original shape in much the same manner as a collar stay maintains the shape of a collar. Minimal lateral support is offered by such spring steel inserts as may be seen illustrated in FIG. 8 which shows that only a relatively small force F is required to deform such spring steel inserts considerably in a lateral direction.

The present invention, however, features an articulated insert 17 comprising, in this embodiment, links 18, 19, 20, 21 and 22. Such links are joined at pivot points 23, 24, 25 and 26 and are secured by flathead rivets 27.

As illustrated in Fig. 5, a typical link joint 28 includes matching mating tongue portions 29 and 30 of adjacent links, through which aligned apertures 31 are formed. Flathead rivet 27 is then inserted through the aligned apertures to pivotally secure said adjacent links together. Such joints allow full articulation in a plane perpendicular to the axis of the joint while at the same time rigidly resisting any force exerted perpendicular to said plane of articulation. If for example, force F is applied to joint 28, tongue 30 will be forced against tongue 31 which, with rivet 27 will prevent any further lateral displacement. The mating surfaces of tongues 30 and 31 may be highly polished or treated with an anti-friction compound to assure full articulation even while any such lateral force may be applied to the device.

Thus constructed, the articulated brace will not only prevent lateral forces from stressing the knee joint but will also tend to prevent or limit any lateral movement of the femoral portion with respect to the tibial portion of the knee as may result, for example, from any injury weakening or destroying any of the complex major tendons or ligaments which hold the knee together.

To achieve effective support while allowing free articulation of the knee joint, the individual segments of brace members 17 must be carefully proportioned. One such set of proportioned links found experimentally to operate successfully features the longest link 18 positioned furthest above the knee. Links 19 and 21 are of equal length and are joined to both ends of central link 20 which is the shortest of the five links. Lowermost link 22, fastened to the other end of link 21, is longer than any of the intermediate links yet shorter than link 18. As presently conceived, link 18 is 3-1/16 inches long; links 19 and 21 are 2-5/16 inches; link 20 is 2-1/16 inches; and link 22 is 2-9/16 inches. Various sizes and size ratios may be determined with regard to the height and weight of the individual user, and with regard to the joint with which the device is to be used.

As illustrated in FIGS. 2 and 6, articulated brace members 17 are inserted into brace channels 16 and are oriented laterally on either side of the knee. Substantially normal knee articulation is then possible during the healing period.

Although in the above embodiment, the present invention has been discussed as a protective knee device, it is felt that such a device properly proportioned and constructed would serve, for example, as an elbow protector as well.

While the foregoing has described a specific embodiment of the invention, it is to be understood that this embodiment is presented by way of example only and is not intended to limit the scope of the invention. It is anticipated that others skilled in the art will perceive variations which, while differing from the foregoing embodiment, do not depart from the spirit and scope of the invention.