Anatomical joint brace with adjustable joint extension limiter

[0002] Not Applicable

[0003] Not Applicable

[0004] This invention relates in general to braces for human joint support, and in particular to an anatomical brace having cuffs situated about respective limb structures on either side of a uniting pivoting joint such as a knee joint where a pivotable brace joint connects the first and second cuffs and includes a preferably adjustable joint extension limiter for determining pivotable distance of the first and second cuff in relation to each other.

[0005] Because injury and disease can affect the health, well-being, and operability of various joints of the human body, many people prefer to protect and stabilize these joints during certain activities to thereby ward off untoward trauma. Chief among such joints that can benefit from stabilization and protection are the knee and elbow where an injury such as a sports-related abuse or impact can prevent or severely limit continued activity. One manner of protecting and stabilizing joints is to fit a wearer with an appropriate brace whereby a pivotal support member is positioned adjacent the joint and held in place usually by cuff members situated around limb structure sites above and below the supported joint. As is apparent, the cuff members are responsible for stabilizing the support member and therefore must be well secured to their associated limbs. To accomplish such securement, present cuff members are typically provided with one or more straps that are tightened around each limb structure and retained by buckles, hook-and-loop connections, or the like. Co-pending U.S. patent application Ser. No. 09/771,763, filed Jan. 29, 2001, entitled “Anatomical Brace With Rapid Release Securement Member” and incorporated herein by reference in its entirety teaches cuff members that, once adjusted for proper tightness, provide a quick-release and quick-attach mechanism for rapid as well as efficient, effective, and consistent cuff member connections. In addition to providing proper tightness and placement in a limb-surround role, each cuff member also should positively embrace the limb portions on either side of the protected joint (e.g. thigh and upper leg for knee joint). While traditional responsibility for this compressive engagement has been assigned once again to one or more straps that are tightened around each limb structure and retained by buckles or the like, co-pending U.S. patent application Ser. No. 09/578,125, filed May 24, 2000, entitled “Anatomical Joint Brace” and incorporated herein by reference in its entirety, teaches cuff members with tension-adjustable shaft members integral therewith such that torsional compression can be accomplished on embraced limb portions.

[0006] In addition to requiring proper limb structure embrace, a joint brace also requires a joint that supports, stabilizes, and protects the actual joint itself while pivotally joining the cuffs. Thus, in the knee joint for example, the joint of the brace must pivot in one bending or extension plane while also permitting multi planar motion such that the lower leg beneath the knee can be moved in a normal manner. Further, it many times is desirable to limit or regulate the distance of the pivotal extension plane at the knee while allowing normal bendability and normal multi planar motion up to the controlled extension distance. Unfortunately, however, present braces are not able to assist a user in accomplishing such an objective, thereby requiring the user to self-limit his or her movement or risk an undesirable extension. Therefore, in view of the need for extension control, a primary object of the present invention is to provide an anatomically compatible joint brace having a joint extension limiter for regulating pivotable distance of first and second limb cuffs thereof in relation to each other.

[0007] Another object of the present invention is to provide an anatomically compatible joint brace wherein the pivotal jiont extension distance can be adjusted.

[0008] Yet another object of the present invention is to provide an anatomically compatible joint brace wherein the pivotal joint extension distance is controlled by a cable assembly that includes a cable length adjuster for determining pivotable distance of the first and second cuffs in relation to each other.

[0009] These and other objects of the present invention will become apparent throughout the description thereof which now follows.

[0010] The present invention is an anatomical brace for stabilizing and supporting a uniting pivoting joint such as a knee joint disposed between a first limb structure and a second limb structure. The brace includes a first cuff partially encompassable about the first limb structure and a second cuff partially encompassable about the second limb structure. Each cuff preferably is a generally U-shape wall structure with two arms having respective distal ends arcuately extending toward each other for juxtapositioning with respective adjacent limb structure sites. A pivotable brace joint connects the first and second cuffs and comprises two opposing pivoting assemblies each on one side of the uniting pivoting joint. Each of these assemblies includes a forward arm member and a rearward arm member which is in tandem relationship with the forward arm member, and a frame structure having a first end attached to the first cuff and a second end attached to the second cuff. Extending between the first and second cuffs is a joint extension limiter for regulating pivotable distance of the cuffs in relation to each other. Preferably, the limiter is easily adjustable at the brace site and permits full joint operation until the adjusted limit is reached. Most preferably, each assembly comprises a forward arm member having a generally perpendicularly angled first end and a generally perpendicularly angled second end, and a rearward arm member in tandem relationship with the forward arm member, and also having a generally perpendicularly angled first end and a generally perpendicularly angled second end. The assembly also includes a frame structure having a first end attached to the first cuff and a second end attached to the second cuff, and four generally spherical sockets movably positioned within the frame structure such that each spherical socket accommodates one respective perpendicular end of each respective arm member for multi-planar movement between the first and second cuffs. The joint extension limiter most preferably is a length-adjustable cable assembly providing a cable extending from the rearward arm member to the first cuff for regulating the pivotable distance.

[0011] Additional embodiments incorporating the novel joint defined herein can include an anatomical brace having cuffs with quick-connect and quick-release connectors, as well as cuffs having integral therewith at least one tensioning shaft member whereby torsional cuff tightening about the limb structure can be accomplished. By providing pivotal joints as here defined that effectively limit pivotal bend distance, yet permit normal joint bendability as well as normal multi planar movability up to such joint extension limit, the present anatomical brace allows a user to confidently and effectively stabilize and support joint-accomplished unions.

[0012] An illustrative and presently preferred embodiment of the invention is shown in the accompanying drawings in which:

[0013] FIG. 1 is a perspective view of a knee brace with cuffs in place on a patient leg shown in phantom;

[0014] FIG. 2 is a side perspective view of the upper cuff only of FIG. 1 in disassociated relationship;

[0015] FIG. 3 is a side perspective view of the joint assembly including a portion of the brace of FIG. 1;

[0016] FIG. 4 is an exploded perspective view of FIG. 3;

[0017] FIGS. 5aand 5bare perspective views of the front and back sides of the joint assembly of FIG. 3; and

[0018] FIG. 6 is an exploded perspective view of the joint assembly of FIG. 3.

[0019] Referring first to FIGS. 1 and 2, an anatomical knee brace 10 is shown (FIG. 1) in place on a leg 12 of a human being. The brace 10 has a first cuff 14 encompassed about the limb structure above the knee joint 18 and a second cuff 20 encompassed about the limb structure below the knee joint 18. Each cuff 14, 20 is a generally U-shape, resiliently-lined wall structure, which non-limitedly can be fabricated of a polymer plastic, with the two arms of the U-shape having respective distal ends arcuately extending toward each other for juxtapositioning with respective adjacent limb structure sites. Snap-in protective patella cups 16 can be included as shown for specific impact absorption that may occur at the patella of the knee joint 18. At least one tensioning shaft member 22 is integral within each arm of each cuff 14, 20. The earlier-referenced patent application entitled “Anatomical Joint Brace” provides additional information relative cuff tensioner construction and operation. Each cuff 14, 20 has a respective cuff retainer 26 here non-limitedly exemplified as pairs of respective first and second bendable plastic limb wraps 28, 30 generally extendable toward each other from each arm for positioning around each respective limb structure and adjustably tightenable with intertwined laces 29 in substantially the same manner as a shoe is tied. At least one limb wrap 28 of a pair is attached to an arm by two releasable connectors 32, 34 having finger-operable button releases 36, 38 for disengaging the limb wrap 28 from the corresponding arm. The earlier-referenced patent application entitled “Anatomical Brace With Rapid Release Securement Member” provides additional information relative cuff retainer construction and operation.

[0020] Referring specifically to FIGS. 3-6, a pivotable brace joint pivoting assembly 50 is illustrated. The assembly 50 includes an upper housing 52 and a lower housing 54 that fit, respectively, into a complementarity shaped opening 56 of first cuff structure 58 and a complementarity shaped opening 60 of lower cuff structure 62. Once so positioned, respective caps 64, 66 are held in place with conventional set screws 65 passing respectively through apertures 68a, 68band 70a, 70b. An interfacing plate 83 resides between the assembly 50 and the knee joint 18. Both the upper and lower housings 52, 54 have two respective openings 72a, 72band 74a, 74beach having respective sidewalls 76 shaped to nest a spherical shape. Disposed between two openings 72b, 74aof the housings 52, 54 is a forward arm member 78 having generally perpendicularly angled first and second ends 80a, 80bdirectable toward the openings 72b, 74a. In like manner, a rearward arm member 82 having generally perpendicularly angled first and second ends 84a, 84bis disposed between two openings 72a, 74bof the housings 52, 54 such that the ends 84a, 84bare directable toward the openings 72a, 74b. A cable assembly 86 includes a cable 88 extending from the upper housing 52 to an upper edge portion 89 through an aperture 91 of the rearward arm member 82, and is provided with a conventional set screw 90 at one end thereof for extending or shortening the length of the cable 88 disposed between the rearward arm member 82 and upper housing 52. Such length adjustment is accomplished with an Allen wrench inserted into the enterable channel 87 leading to the set screw 90. Because the upper housing 52 resides within the structure 58 of the first cuff 14, the cable 88 functions as a joint extension limiter to determine the travel distance of the first cuff 14 from the joint and thus the pivotal distance of the first and second cuffs 14, 20 in relation to each other.

[0021] As earlier described, the sidewalls 76 of the openings 72a, 72band 74a, 74bare shaped to nest spherical forms. As clearly illustrated in FIG. 6, spherical sockets 92a, 92b, 92c, 92dare disposed in these openings 72a, 72band 74a, 74bin the constructed assembly 50, and each such socket accepts one respective perpendicularly angled end of forward and rearward arm members 78, 82. Each angled end 80a, 80b, 84a, 84bhas an aperture 94 there through which mates with a transverse aperture 96 of each socket 92a, 92b, 92c, 92dsuch that respective pins 98 can pass through such mated apertures and retain the angled ends 80a, 80b, 84a, 84bwithin the sockets 92a, 92b, 92c, 92d. Because of the spherical interface between each socket 92a, 92b, 92c, 92dand each sidewall 76, multi planar movement of the cuffs 14, 20 in relation to each other can be accomplished. The brace joint pivoting assembly 50 thereby permits replication of normal multi planar joint movement while providing adjustable bend distances via operation of the cable assembly 86, and in this manner stabilization and support of a uniting pivoting joint disposed between a first limb structure and a second limb structure can occur.

[0022] While an illustrative and presently preferred embodiment of the invention has been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims are intended to be construed to include such variations except insofar as limited by the prior art.