Patent Application
20150148726
Knee braces are typically used by athletes engaged in vigorous physical activity to protect the knee from injury or to avoid worsening of an existing injury. Certain types of knee braces, termed prophylactic braces, are configured to minimize the initiation of an injury in an athlete. For example, prophylactic braces typically include a hinge joint disposed between upper and lower leg mounting supports where the hinge joint is aligned with a center of rotation of a user's knee joint. Generally, the prophylactic braces minimize excessive movement in the knee joint, either front to back (anterior-posterior), side to side (medial-lateral), or rotational, and aid in controlling knee stability.
Conventional knee braces suffer from a variety of deficiencies. For example, prophylactic braces include one or more hinge joints that allow a wearer to flex his leg at the knee joint along a substantially anterior-posterior direction. However, conventional hinge joints can inhibit medial-lateral movement of the wearer's leg which can constrain the natural positioning of the wearer's upper and lower leg portions during use. Additionally, in certain knee braces, the hinge joint is configured as disk hinge having a center of rotation substantially aligned with the center of rotation of the wearer's knee. However, the physiological motion of a wearer's knee includes both rotation and linear translation of the upper and lower leg portions relative to each other. Accordingly, conventional disk joints can limit linear motion of the knee brace wearer's knee which can unnecessarily load and/or strain the knee's soft tissues.
By contrast to conventional knee braces, embodiments of the present innovation relate to a knee brace apparatus. In one arrangement, the knee brace apparatus includes a first brace assembly configured to be secured to a user's leg above the knee and a second brace assembly configured to be secured to the user's leg below the knee. The knee brace apparatus also includes a hinge disposed between the first brace assembly and the second brace assembly. The hinge includes a set of strap elements arranged such that the planar surfaces of the strap elements are disposed substantially parallel to each other along an anterior-posterior orientation of the knee brace apparatus. With such an arrangement, the hinge is substantially flexible along the anterior-posterior orientation and is substantially stiff along the medial-lateral orientation. Accordingly, the hinge allows a wearer to flex the knee brace apparatus at the knee joint while protecting the wearer's knee from impact loading. Additionally, as the user flexes the knee brace apparatus, the strap elements are configured to translate or slide along a longitudinal axis relative to each other. The knee brace apparatus can therefore substantially track the physiological motion of a wearer's knee, including both rotation and linear translation, during operation to minimize binding of the hinge.
In one arrangement, a knee brace assembly comprises a first brace assembly configured to be secured to a first leg portion of a leg relative to a knee, a second brace assembly configured to be secured to a second leg portion of the leg relative to the knee, the second leg portion opposing the first leg portion and a hinge disposed between the first brace assembly and the second brace assembly. The hinge includes a plurality of strap elements, each strap element defining a planar surface, the planar surfaces of the plurality of strap elements being disposed substantially parallel to each other along an anterior-posterior orientation of the first leg portion and the second leg portion.
The foregoing and other objects, features and advantages will be apparent from the following description of particular embodiments of the innovation, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of various embodiments of the innovation.
Embodiments of the present innovation relate to a knee brace apparatus. In one arrangement, the knee brace apparatus includes a first brace assembly configured to be secured to a user's leg above the knee and a second brace assembly configured to be secured to the user's leg below the knee. The knee brace apparatus also includes a hinge disposed between the first brace assembly and the second brace assembly. The hinge includes a set of strap elements arranged such that the planar surfaces of the strap elements are disposed substantially parallel to each other along an anterior-posterior orientation of the knee brace apparatus. With such an arrangement, the hinge is substantially flexible along the anterior-posterior orientation and is substantially stiff along the medial-lateral orientation. Accordingly, the hinge allows a wearer to flex the knee brace apparatus at the knee joint while protecting the wearer's knee from impact loading. Additionally, as the user flexes the knee brace apparatus, the strap elements are configured to translate or slide along a longitudinal axis relative to each other. The knee brace apparatus can therefore substantially track the physiological motion of a wearer's knee, including both rotation and linear translation, during operation to minimize binding of the hinge.
In one arrangement, the first brace assembly 12 is configured to be secured to a wearer's upper leg or thigh above the wearer's knee 27 and the second brace assembly 14 is configured to be secured to a wearer's lower leg below the wearer's knee 27. It should be noted that the first and second brace assemblies 12, 14 can be secured to the wearer's leg in a variety of ways. For example, one or both of the first and second brace assemblies 12, 14 can be mechanically attached to the wearer's pants above and below the wearer's knee 27. In another example, the first and second brace assemblies 12, 14 can be secured to the wearer's leg via a friction fit, either over or under the wearer's pants. While the brace assemblies 12, 14 can be manufactured from a variety of materials, in one arrangement, the assemblies 12, 14 are manufactured from either a cloth material or substantially rigid plastic material.
Each of the first brace assembly 12 and the second brace assembly 14 can include a sizing mechanism (not shown) configured to adjust the circumference of the first and second brace assemblies 12, 14 to conform to the wearer's leg 25. For example, in the case where the brace assemblies 12, 14 are manufactured from a cloth material, the sizing mechanisms can be configured as one or more hook and loop material (e.g., VELCRO) straps. In another example, in the case where the brace assemblies 12, 14 are manufactured from a plastic material, the sizing mechanisms can be configured as a compliant material, such as a foam rubber material, which extends about the inner peripheries of the housings 13, 15 of the assemblies 12, 14. In such a case, the compliant material reduces an inner diameter of the housings 13, 15 to create a friction fit between the assemblies 13, 15 and the wearer's leg 25. Alternately, the first and second assemblies 13, 15 can each include an inflatable cuff or bladders as the sizing mechanism. For example, after placing the knee brace apparatus 10 on his leg 25, the wearer can inflate each bladder of the first and second brace assemblies 12, 14 to create a friction fit between the knee brace apparatus 10 and the wearer's leg 25.
As illustrated, each of the first and second brace assemblies 12, 14 include respective first and second hinge holders 18, 20 configured to secure opposing ends of the hinge 16 to the first and second brace assemblies 12, 14. For example, with particular reference to
In order to maintain consistency in the placement and orientation of the knee brace apparatus 10 on the wearer's leg, the hinge 16 is configured to maintain a longitudinal spacing d2 between the first and second brace assemblies 12, 14. For example, with first and second ends of the hinge 16 disposed within the respective first and second hinge holders 18, 20, the hinge 16 maintains a substantially fixed longitudinal spacing or distance d2 between the first and second brace assemblies 12, 14.
The hinge 16 is further configured to provide relative motion between the first and second brace assemblies 12, 14 when the wearer flexes his leg 25 at the knee 27. In one arrangement, as shown in
The opposing ends of the set of strap elements 22 are disposed within the respective first and second hinge holders 18, 20 such that opposing anterior and posterior surfaces 26, 29 of adjacent strap elements 24 are disposed in a stacked arrangement substantially parallel to each other along an anterior-posterior orientation 28 of the knee brace apparatus 10. For example, with reference to
Based upon the geometric configuration of the strap elements 24 of the hinge 16, as well as the material properties and the orientation of the hinge 16 relative to the first and second brace assemblies 12, 14, the hinge 16 is substantially flexible along an anterior-posterior direction or axis 28. During operation, as the wearer flexes or extends his leg 25 (e.g., along arc 31 as shown in
The relative flexibility of the knee brace apparatus 10 along an anterior-posterior axis or direction 28 can depend upon the material properties of the strap elements 24 of the hinge 16. For example, to configure the hinge 16 as relatively compliant or flexible along the anterior-posterior axis 28, a manufacturer can select relatively compliant plastic strap elements 24, relatively compliant metallic strap elements 24, or some combination thereof to form the hinge 16. In another example, to configure the hinge 16 as relatively stiff along the anterior-posterior axis 28, a manufacturer can select relatively stiff plastic strap elements 24, relatively stiff metallic strap elements 24, or some combination thereof to form the hinge 16.
In use, while the first and second brace assemblies 12, 14 are secured to the wearer's leg, as the wearer flexes and extends his leg, the positioning of the first and second brace assemblies 12, 14 relative to each other can vary. To account for this change in relative positioning, the hinge 16 can be physically configured to allow for relative movement of the first and second brace assemblies 12, 14 during use.
For example, with reference to
By securing the strap elements 24 at the first end 34, the binding member 32 allows the plurality of strap elements 22 to translate or slide relative to each other along a longitudinal axis 36, as illustrated in
With such a configuration, and with reference to
In one arrangement, with reference to
In another arrangement, with reference to
As indicated above, the hinge 16 is configured as being substantially flexible along the anterior-posterior direction or axis 28. Further, with reference to
For example, with reference to
As described above, the hinge 16 is substantially flexible along an anterior-posterior orientation and is substantially rigid along a medial-lateral orientation. Accordingly, the hinge 16 allows a wearer to flex the knee brace apparatus 10 at his knee joint 27 while substantially tracking the physiological motion of a wearer's knee, including both rotation and linear translation of the upper and lower leg portions relative to each other. Therefore, the hinge 16 minimizes binding of the knee brace apparatus 10 limits the apparatus 10 from generating load and/or strain on the soft tissues of the wearer's knee. Further, the hinge 16 is configured to protect the wearer's knee 27 from medial-lateral impact loading. With the orientation and stacked arrangement of the strap elements 24 within the knee brace apparatus, the hinge 16 is configured with a relatively high stiffness along a medial-lateral axis 30. Such a configuration reduces a medial-lateral impact load received by the wearer and minimizes injury to the wearer's knee as caused by the impact.
As indicated above, the knee brace apparatus 10 is configured to allow a wearer to flex his knee at the knee joint 27 while protecting the wearer's knee from impact loading. During use, the wearer's knee may be exposed to a torque load. In one arrangement, the knee brace apparatus 10 can include a torque reducing mechanism configured to limit or minimize torqueing of the wearer's upper and lower leg portions about the knee joint.
To minimize the distribution of a torque load 96 to a wearer's knee, the torque reduction mechanism 90 is configured with a relatively larger torsional rigidity or stiffness than the strap elements 24. For example, in the case where the strap elements 24 are manufactured from a first material, such as a plastic material, having a first stiffness, the torque reduction mechanism 90 can be manufactured from a second material, such as a metal material having a second, higher stiffness. In another example, assume the case where the strap elements 24 and the torque reduction mechanism 90 are manufactured from the same material, such as a plastic material. In such a case, the thickness 80 of the torque reduction mechanism 90 can be greater than the thickness 82 of the strap elements 24. The relative difference in thickness provides the torque reduction mechanism 90 with a relatively larger torsional rigidity compared to the strap elements 24. In another example, the torque reducing mechanism 90 defines a length l that is longer than the lengths of the strap elements 24 of the hinge 16. The difference in length provides the torque reduction mechanism 90 with a relatively larger torsional rigidity compared to the strap elements 24.
In any of the example configurations provided, the torque reducing mechanism 90 is configured to flex or bend with the strap elements 24 along arc 38 and substantially within an anterior-posterior orientation 28 of the knee brace apparatus 10. However, because the torque reduction mechanism 90 is configured with a relatively larger torsional rigidity compared to the strap elements 24, the torque reduction mechanism 90 can resist torsional bending in response to a load 96 applied to opposing ends 34, 42 of the hinge 16. Accordingly, the torque reduction mechanism 90 can aid the knee brace apparatus 10 in minimizing the risk of injury to a wearer's knee when exposed to a torque load.
As shown in
To minimize the distribution of a torque load 96 to a wearer's knee, the torque reduction mechanism 190 is configured with a relatively larger torsional rigidity or stiffness than the hinge 16. For example, in the case where the strap elements 24 of the hinge 16 are manufactured from a first material, such as a plastic material, having a first stiffness, the torque reduction mechanism 190 can be manufactured from a second material, such as a metal material having a second, higher stiffness. In another example, assume the case where the strap elements 24 of the hinge 16 and the torque reduction mechanism 90 are manufactured from the same material, such as a plastic material. In such a case, the thickness 180 of the torque reduction mechanism 90 can be greater than the thickness 182 of the strap elements 24. The relative difference in thickness provides the torque reduction mechanism 190 with a relatively larger torsional rigidity compared to that of the set strap elements 22 of the hinge 16.
In either configuration, the torque reducing mechanism 190 is configured to flex or bend with the hinge 16 along arc 38 and substantially within an anterior-posterior orientation 28 of the knee brace apparatus 10. However, because the torque reduction mechanism 190 is configured with a relatively larger torsional rigidity compared to the hinge 16, the torque reduction mechanism 190 can resist torsional bending in response to a load 96 applied to opposing ends 34, 42 of the hinge 16. Accordingly, the torque reduction mechanism 190 can aid the knee brace apparatus 10 in minimizing the risk of injury to a wearer's knee when exposed to a torque load.
As indicated above, the first and second brace assemblies 12, 14 can include a sizing mechanism configured to adjust the circumference of the first and second brace assemblies 12, 14 to conform to the wearer's leg 25. In one arrangement, as illustrated in
For example, each of the energy absorption subassemblies 102, 106 can include respective first or inner ring elements 110, 112 and second or outer ring elements 111, 113. The energy absorption subassemblies 102 and 106 also include respective first and second energy-absorption members 103, 107. As illustrated, with respect to the first brace assembly 12, the first energy absorption member 103 span the distance between and connects the first ring element 110 to the second ring element 111 and, with respect to the second brace assembly 14, the second energy absorption member 107 spans the distance between and connects the first ring element 112 to the second ring element 113. The elastomeric energy-absorption members 103, 107 are configured to expand and contract between the respective first 110, 112 and second 111, 113 ring elements in response to loading of the first and second brace assemblies 12, 14.
While the energy absorption members 103, 107 can be configured in a variety of ways, in one arrangement, the energy-absorption members 103, 107 are constructed as annular pieces of elastomeric material. The energy absorption members 103, 107 can be created, for example, through extrusion or by cutting an elastomeric tube of the correct diameter into pieces of a desired width.
The energy absorption members 103, 107 can be disposed at particular locations, and spaced in a particular manner, to accomplish a given amount of energy-absorption at one or more locations on the energy absorption subassemblies 102, 106. For example, stronger elastomers can be placed with some slack such that they begin to stretch only close to the endpoint of travel of the outer rings 111, 113. In another example, multiple elastomeric energy absorption members 103, 107 of different lengths and/or different strengths can be located in parallel so that their energy-absorption is cumulative.
Assemblies 102 and 106 are arranged such that in the rest position shown in the drawings, there is a larger gap between the respective inner 110, 112 and outer rings 111, 113 at a lateral location 120 than at a medial location 121. Taking the first brace assembly as an example, a first gap 125 between the first and second ring elements 110, 111 at lateral location 120 is larger than a second gap 127 between the first and second ring elements 110, 111 at the opposing, medial location 121. Since the gap 125 in the area of impact defines the maximum travel of the outer rings 111, 113 of the energy-absorption subassemblies 102, 106 relative to the inner rings 110, 112, having the inner 1110, 112 and outer rings 111, 113 generally but not exactly concentric, as in this case, can provide additional energy absorption in one direction, which in this case is impact to the outside of the knee area that can cause severe injury.
In use, and with particular reference to
For example, in the case where the second brace assembly 14 receives an impact load along direction 150, as shown in
While various embodiments of the innovation have been particularly shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the innovation as defined by the appended claims.
For example, as described above, the energy absorption members 103, 107 are described as annular pieces of elastomeric material. Such description is by way of example only. In one arrangement, the energy absorption members can be configured as insertable elastomers, as illustrated in
During assembly, the energy absorption members 402, 410 are pushed through aligned openings in the ring elements via tool 414, illustrated in
Upon impact, member 402 will be stretched and then eventually, if the inner and outer ring elements are moved sufficiently far apart, member 450 can be stretched to absorb more energy. Also, as described above, the different members can be different strengths (e.g., different thicknesses) to provide more variability to the energy absorption characteristics of the protective device.
As indicated above, the hinge 16 can be mounted within the knee brace apparatus 10 such that the first end 34 is fixedly coupled to the first brace assembly 12. In one arrangement, with reference to
As indicated above, in order to maintain consistency in the placement and orientation of the knee brace apparatus 10 on the wearer's leg, the hinge 16 is configured to maintain a longitudinal spacing d2 between the first and second brace assemblies 12, 14. For example, the first end 34 of the hinge 16 is connected to the first hinge holder 18 and the second end 42 of the hinge 16, is connected to the second hinge holder 20 via a second pin assembly 46. The configuration of the knee brace apparatus 10 maintains a substantially fixed longitudinal spacing or distance d2 between the first and second brace assemblies 12, 14. Such description is by way of example only. In one arrangement, as illustrated in
As illustrated, the first brace assembly 12 is secured to a wearer's upper leg or thigh above the wearer's knee 27 and the second brace assembly 14 is disposed below the wearer's knee 27 and is secured above the wearer's calf 190. With the positioning of the second brace assembly 14 below the knee 27 and above the calf 190, the calf 190 limits the second brace assembly 14 from sliding along direction 192. Accordingly, the positioning of the second brace assembly 14 above the calf 190 substantially maintains the longitudinal spacing d2 between the first and second brace assemblies 12, 14.
Additionally, because the interaction between the second brace assembly 14 and the wearer's calf 190 substantially maintains the relative positioning of the first and second brace assemblies 12, 14, the second end 42 of the hinge 16, with or without the torque reducing mechanism 90 of
In use, as the wearer flexes or extend his leg, the strap elements 24 can translate along axis 204 and can move longitudinally (i.e., along a direction that is substantially into and out of the page) within the second hinge holder 20. Accordingly, by providing lateral and longitudinal freedom of movement of the second end 42 of the hinge 16, the opening 200 minimizes binding of the strap members 24 during operation.
This patent application claims the benefit of U.S. Provisional Application No. 61/906,959, filed on Nov. 21, 2013, entitled, “Knee Brace Assembly,” the contents and teachings of which are hereby incorporated by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61906959 | Nov 2013 | US |
