the device of the invention comprises a base or platform . the base can be any size and shape that can stably support a human foot of a person in a sitting position . while the size and shape is not limited , in general the base will be generally rectangular , with a width of about 10 cm to about 25 . 4 cm ( about 4 - 10 inches ) and a length of about 20 cm to about 92 cm ( about 8 - 16 inches ). however , it is to be understood that any size and shape can be used , including , but not limited to square , triangle , round , or a complex shape , such as the shape of a human foot . the base comprises a solid material that is sufficient strong to support a foot of a person in a sitting position . the solid material is not particularly limited , and can be , for example , a piece of wood , plastic , metal , or similar material , or a combination thereof . the base comprises a top or upper surface and a lower surface . the upper surface can be of the same material as the core of the base , or can be made of a different material . in one exemplary embodiment of the invention , the base is designed with a no slip top surface so the patient &# 39 ; s foot does not slip off . for example , the top surface of the base can include a non - slip mat of rubber , plastic vinyl , carpet , or other non - slip covering . in some embodiments where the top surface includes a material that is different than the core of the base , the top surface is easily removable , for example for replacement or cleaning . the lower surface of the base is not particularly limited in composition , and is typically made of the same material as the core of the base . the lower surface serves as a connection point for the rolling means . the rolling means is attached to the lower surface by way of any common fastener , such as , but not limited to , screws , nails , staples , and adhesive . the rolling means is any structure that is suitable for allowing the device as a whole to move with relation to the ground , but only in two directions ( i . e ., forward and backward ). the rolling means can be any of the various known objects that are suitable for attaching to other objects to enable the objects to roll . non - limiting examples of rolling means include wheels , rollers , casters , bearings , and the like . the device of the invention includes at least one rolling means , which can be a single individual rolling object or a combination of two or more rolling objects together in a single housing to form a unit . for example , a rolling means can be configured as a unit of two or more wheels in the fashion of an in - line skate . alternatively , a rolling means can be configured as multiple wheels in a side - by - side alignment across the width of the platform . regardless of the configuration chosen , it is preferred that the rolling means are configured in a way that limits side - to - side rocking of the platform , so as to limit stretching and twisting of the knee of the patient . in exemplary embodiments , the base is attached with two or more wheels mounted on the bottom surface . the wheels are fixed in their orientation such that only front / back motion is possible for the base . turning now to the figures , with reference to fig1 - 2 , there is in accordance with this invention a knee mobility therapy apparatus 5 for use by a patient ( not shown ) sitting with his foot ( not shown ) placed upon the top surface 2 of the device . the apparatus includes a base 1 that is made to only move in the forward / backwards direction by way of locking or otherwise adjusting the wheels 3 such a way as to limit the degrees of motion to only two directions — forward and backward , so as to not damage the knee joint of the patient while the device is in use . the base may include a built in non - slip surface , such as built in groves or bumps , so that the patient &# 39 ; s foot may stay securely on the platform . for example , the base may include a foot mount for the patient to firmly attach the patient &# 39 ; s foot to the base . any of a number of foot mount designs can be used , including , but not limited to , a strap . the present invention has been described with reference to the appended drawings and such description is for illustrative purposes only . the invention is not intended to be limited by the preferred embodiments illustrated in the drawings . those skilled in the art will appreciate that the scope of the invention extends to other comparable embodiments .
a knee mobility therapy apparatus is described . the apparatus is designed for use by a patient in a seated position having the foot of the leg to be treated resting on the top flat surface of the device . the device is designed to only go forward and backwards so as not to put strain on the knee of the patient . the device is oriented by the patient so the leg may only go forwards and backwards .