Dynamic hallux tension device for treatment of plantar fasciitis

Abstract

A physical rehabilitation device for the treatment of a medical condition of the foot known as plantar fasciitis includes a splint which is connected to the toe and ankle of a patient. The splint can be used in a method for treating plantar fasciitis known as dynamic splinting. This device allows the patient to bend the ankle and thus dynamically change the flexion in the foot of the patient. The device itself is unique, but the method of treatment made possible by this device is also unique.

Claims

1. A foot splint for treating plantar fasciitis, comprising: a first sling portion configured to fit over a hallux but not the metatarsophalangeal joint in a natural human foot; and a second sling portion attached to a dorsal side of the first sling portion, the second sling portion defining two straps of flexible material configured to releasably wrap around an ankle of the natural human foot to secure the hallux in a dorsiflexed position and thereby tension a plantar fascia of the natural human foot by pulling on said dorsal side of the first sling portion, said two straps extending from said dorsal side of the first sling portion, and configured to extend over a top of the foot and around the ankle, the two straps of flexible material releasably fastenable to each other around the ankle, the first sling portion and second sling portion defining a helix, wherein the foot splint is configured for daily wear within a shoe during ambulation and allows a user to dynamically control an amount of tension applied to the plantar fascia by allowing the user to dorsiflex and plantarflex the ankle while wearing the splint.

2. The foot splint of claim 1, wherein the first sling portion is configured to fit over the hallux and the second toe of the natural human foot.

3. The foot splint of claim 1, wherein the first and second sling portions each comprise a band of elastic material.

4. The foot splint of claim 1, wherein the two straps of the second sling portion are coupleable to each other via a hoop and loop fastener.

5. The foot splint of claim 1, further comprising a sock attached to the first and second sling portions along a length of the first and second sling portions and configured to fit over the foot.

6. The foot splint of claim 5, wherein the first and second sling portions are disposed over the sock.

7. The foot splint of claim 6, wherein the first and second sling portions, when fitted over the hallux and ankle of the natural human foot, do not secure the hallux in a fixed position or the ankle at a 90 degree angle, thereby allowing for dynamic splinting of the plantar fascia of the foot.

8. A foot splint for treating plantar fasciitis, comprising: a first sling portion comprising a loop configured to fit over a hallux distal of the metatarsophalangeal joint in a natural human foot; and a second sling portion attached to the first sling portion, the second sling portion comprising two bands configured to releasably wrap around an ankle of the natural human foot to secure the hallux in a dorsiflexed position and thereby tension a plantar fascia of the natural human foot by pulling on a dorsal side of the first sling portion, the two bands configured to releasable attach to each other via an attachment member, the first and second sling portions together defining a helix shape, wherein the foot splint allows a user to dorsiflex and plantarflex the ankle while wearing the splint, thereby allowing the user to dynamically control an amount of tension applied to the plantar fascia during use.

9. The foot splint of claim 8, wherein the first sling portion is configured to fit over the hallux and the second toe of the natural human foot.

10. The foot splint of claim 8, wherein the first sling portion comprises a band of elastic material.

11. The foot splint of claim 8, wherein the two bands of the second sling portion comprise elastic material.

12. The foot splint of claim 8, wherein the attachment member comprises a hoop and loop fastener.

13. The foot splint of claim 8, further comprising a sock attached to the first and second sling portions along their lengths and configured to fit over the foot.

14. The foot splint of claim 8, wherein the second sling portion is attached to the dorsal side of the first sling portion, and wherein said two bands are configured to extend from said dorsal side of the first sling portion, over a top of the foot and around the ankle, such that the two bands solely fasten the splint to the ankle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further features, properties and advantages of the present invention will become clear from the following description of embodiments in conjunction with the accompanying drawings. The described features are advantages alone and in combination with each other.

(2) FIG. 1 shows an isometric view of the main components of the first embodiment of the device over a foot.

(3) FIG. 2 shows a medial view of an assembled device over the bones of the foot.

(4) FIG. 3 shows the medical device without a sock not attached to a patient and laid out in a resting position.

(5) FIG. 4 shows an Isometric view of the actual mechanical device without sock.

(6) FIG. 5 shows a top view of actual mechanical device without sock.

(7) FIG. 6 shows Isometric view of mechanical device with sock.

(8) FIG. 7 shows a close-up view of the helix which fits over the large toe (hallux) of the patient.

DETAILED DESCRIPTION

(9) A first embodiment of a dynamic tension device is illustrated in FIGS. 1-5 and 7 (medial view of device over the bones of the foot). The device utilizes a hallux sling 1 (FIG. 2), which is a stiff elastic band consisting of a nylon blend, although it is not limited to this material, wrapped around the plantar surface of the hallux 4 (FIG. 2). The second toe may also be included in the hallux sling 1 (FIG. 2).

(10) The hallux sling 1 (FIG. 2) is secured to the ankle 5 (FIG. 2) via the ankle sling 2 (FIG. 2). The ankle sling 2 (FIG. 2) is another stiff elastic band, which is composed of the same material as the hallux sling 1 (FIG. 2), although it may be composed of a different material. The ankle sling 2 (FIG. 2) is less stiff than the hallux sling 1 (FIG. 2) and is wrapped around the ankle 5 (FIG. 2).

(11) A second embodiment of the invention includes the first embodiment of the invention, in addition to a sock as shown in FIG. 6. Alternatively, the remainder of the dynamic tension device is filled in with a flexible material 3 (see e.g., FIG. 2), such as a cotton-blend, to mimic a sock, although it may be composed of another flexible material, or the remainder can be left empty based on the desired design and function.

(12) The operation of the device is illustrated in the following FIGS. 1,3,4,5,6 and 7.

(13) The device is simple in design. It is composed of a hallux (big toe) sling 1 made of an elastic band and cotton or other similar materials which is secured to itself by a VELCRO hoop and loop fastener-or other similar material. The hallux sling 1 is in the form of a helix. A hallux sling 1 of the first embodiment of the invention, without a sock, is shown over a foot in FIG. 1.

(14) A close view of the hallux loop (helix) of the device is shown in FIG. 7. As shown the helix can include a second piece of elastic or other comparable material to increase comfort for the patient. The loop is composed of an elastic band sewn to a cloth band. These combined bands form a loop or helix and turn back in to be secured by a VELCRO hoop and loop fastening device.

(15) This device utilizes a hallux sling 1 (FIG. 2), composed of an elastic band, wrapped around the plantar surface of the hallux 4 (FIG. 2) but not including the metatarsophalangeal joint 8 (FIG. 2) between the first metatarsal 7 and the hallux 4 to provide the force of dorsiflexion required to overcome the resting strength of the flexor hallicus longus and result in passive hallux dorsiflexion. The second toe may be included in the hallux sling 1 (FIG. 2) to increase the effect of the device as the windlass effect is mediated primarily by the first and second toes, but it is not required. Additionally, the hallux sling 1 (FIG. 2) remains articulated at the metatarsophalangeal joint 8 (FIG. 2), free from the remaining toes not incorporated into the hallux sling 1 (FIG. 2), to allow for independent dorsiflexion of the hallux 4 (FIG. 2), locking of the longitudinal arch, and tension to the plantar fascia. Dorsiflexion of the hallux 4 (FIG. 2) activates the Windlass effect by tensing the plantar fascia and locking the longitudinal arch of the foot.

(16) The hallux sling 1 (FIG. 2) is secured to the ankle 5 (FIG. 2) via the ankle sling 2 (FIG. 2). The ankle sling 2 (FIG. 2) is another stiff elastic band, which is less stiff than the hallux sling 1 (FIG. 2), and it is wrapped around the ankle 5 (FIG. 2) to provide the force of dorsiflexion required to overcome some of the resting strength of the gastrocnemius-soleus complex and result in passive ankle dorsiflexion. It is this portion that will act like any traditional static ankle splint by maintaining the ankle 5 (FIG. 2) in a dorsiflexed position. The ankle sling 2 (FIG. 2) may be in continuity or adjustable to accommodate increased tension as well as large foot sizes. If adjustable, one or both sides of the sling can be pulled and wrapped behind the ankle 5 (FIG. 2) until appropriate fit and/or tension is achieved, and the sling can be fixed into position by securing the sides of the ankle sling 2 (FIG. 2) with an attachment device 6 (FIG. 4), including, but not limited to, tape, VELCRO hoop and loop fastener, a zipper, or a snap. Because the hallux sling 1 (FIG. 2) is attached to the ankle sling 2 (FIG. 2) providing tension from the dorsal side of the hallux 4 (FIG. 2), dorsiflexion changes with tibiotalar motion. Hence, the more tibiotalar plantarflexion results in more hallux 4 (FIG. 2) dorsiflexion and vice versa. It is possible, but not required, that the hallux sling 1 (FIG. 2) and ankle sling 2 (FIG. 2) be made of the same material with a static elasticity or an elastic gradient as long as tension is applied in the dorsal direction at the hallux 4 (FIG. 2) and ankle 5 (FIG. 2). This allows the foot to come to a new equilibrium position at rest with the plantar fascia tensed and the longitudinal arch locked. The plantar fascia is tensed and longitudinal arch is locked independent of the position of the tibiotalar joint.However, the force applied to the plantar fascia can change with tibiotalar motion, alleviating the burning pain associated with a static stretch applied to the plantar fascia.

(17) The remainder of the device can be filled in with a flexible material 3 (FIG. 2) to mimic a sock or left empty to mimic a splint depending on the desired design and function. The flexible material 3 or sock can be sewn into the hallux sling 1 and ankle sling 2, or a sock may fit, as shown in FIG. 6, underneath the hallux sling 1 and ankle sling 2. Being the most flexible and located on the plantar aspect of the hallux 1 (FIG. 2) proximal to the first metatarsophalangeal joint 8 (FIG. 2), this remaining material will not affect the function of the device as long as it remains more flexible than the hallux sling 1 (FIG. 2) or ankle sling 2 (FIG. 2). The device is designed to be simple and easily manufactured. The device retracts the big toe of the foot through use of a strap.