Sensomotoric hand therapy device
The present invention relates to a sensomotoric hand therapy device comprising a flexible shell having a first leg portion configured to accommodate fingers of a hand of a patient, a second leg portion configured to accommodate a thumb of the patient and a U-shaped portion configured to accommodate a metacarpus of the patient. The device further comprises a first reinforced member connected to a distal end region of the first leg portion of the shell, a second reinforced member connected to a distal end region of the second leg portion of the shell and a third reinforced member connected to and reinforcing the U-shaped portion of the shell. Further, the device comprises a movement mechanism defining a course and resistance of movement of the first reinforced member and the second reinforced member relative to the third reinforced member; and to a respective hand therapy system and hand training method.
1 . A sensomotoric hand therapy device comprising:
a flexible shell having a first leg portion configured to accommodate fingers of a hand of a patient, a second leg portion configured to accommodate a thumb of the patient and a U-shaped portion configured to accommodate a metacarpus of the patient;
a first reinforced member connected to a distal end region of the first leg portion of the shell;
a second reinforced member connected to a distal end region of the second leg portion of the shell;
a third reinforced member connected to and reinforcing the U-shaped portion of the shell; and
a movement mechanism defining a course and resistance of movement of the first reinforced member and the second reinforced member relative to the third reinforced member.
2 . The sensomotoric hand therapy device according to claim 1 , wherein the movement mechanism comprises a motor to define the resistance of movement of the first reinforced member and the second reinforced member relative to the third reinforced member.
3 . The sensomotoric hand therapy device according to claim 2 , comprising a control unit, wherein the control unit controls the motor of the movement mechanism to define the resistance of movement of the first reinforced member and the second reinforced member relative to the third reinforced member as a function of a displacement of the first reinforced member and the second reinforced member relative to the third reinforced member.
4 . The sensomotoric hand therapy device according to claim 3 , wherein the control unit controlling the motor comprises controlling a torque of the motor.
5 . The sensomotoric hand therapy device according to claim 3 , wherein the control unit comprises a function for computing a motor torque which includes a product of a relative radius and a resisting force and which defines the resistance of movement.
6 . The sensomotoric hand therapy according to claim 5 , wherein the relative radius comprises a sum of an arc radius of the second reinforced member of the shell divided by an overall transmission ratio related to the second reinforced member of the flexible shell and of an arc radius of a first reinforced member of the shell divided by an overall transmission ratio related to the first reinforced member of the shell.
7 . The sensomotoric hand therapy device according to claim 6 , wherein the overall transmission ratio related to the second reinforced member of the shell is between 14 and 22.
8 . The sensomotoric hand therapy device according to claim 6 , wherein an overall transmission ratio related to the first reinforced member of the shell is between 8 and 16.
9 . The sensomotoric hand therapy device according to claim 2 , wherein the shaft of the motor has a first diameter, the belt wheel has a second diameter, the gear wheel has a third diameter, the first herringbone gear member has a fourth diameter and the second herringbone gear member has a fifth diameter.
10 . The sensomotoric hand therapy device according to claim 1 , wherein the movement mechanism comprises a multi-stage transmission unit for transmitting motor torque force.
11 . The sensomotoric hand therapy device according to claim 10 , wherein the transmission unit comprises a first stage, a second stage, and a third stage.
12 . The sensomotoric hand therapy device according to claim 11 , wherein the first stage is in the form of a belt connection, the second stage is in the form of a first herringbone gear member, and the third stage is in the form of a second herringbone gear member.
13 . The sensomotoric hand therapy device according to claim 12 , wherein the transmission unit is connected to the first reinforced member by means of a first connection member being arranged on the first herringbone gear member and to the second reinforced member by means of a second connection member being arranged on the second herringbone gear member.
14 . The sensomotoric hand therapy device according to claim 8 , wherein the first connection member and the second connection member are in the form of a rod, respectively.
15 . The sensomotoric hand therapy device according to claim 12 , wherein the belt connection comprises a first belt wheel, a motor shaft and a synchronous belt, and wherein the first belt wheel carries a herringbone gear wheel.
16 . The sensomotoric hand therapy device according to claim 15 , wherein the first belt wheel is operatively connected to the motor shaft by the synchronous belt, wherein the second herringbone gear member meshes with the herringbone gear wheel on the first belt wheel and wherein the first herringbone gear member meshes with the second herringbone gear member.
17 . The sensomotoric hand therapy device according to claim 1 , wherein the shell is configured to provide a physiological power grasp of the hand of the patient.
18 . A therapy system comprising a sensomotoric hand therapy device according to claim 1 and a computer device configured for executing a virtual reality hand therapy game thereon.
19 . The therapy system according to claim 18 , wherein the virtual reality hand therapy game is configured to compute a rendered force on the basis of the combined displacement and speed of the first reinforced member and the second reinforced member and by further considering parameters representing a virtual spring and a virtual viscous damping.
20 . A method for training a hand of a patient, comprising the steps of:
providing a sensomotoric hand therapy device according to claim 1 ;
providing a computer device with a virtual reality hand therapy game installed thereon;
executing a game task by means of a hand avatar on a screen of the computer device, the task requiring specific interaction forces to be applied from the sensomotoric hand therapy device via the hand avatar to a virtually deformable object on the screen of the computer device; and
squeezing the virtually deformable object with the hand avatar until a predetermined threshold value for the specific interaction forces has been reached.
21 . The method according to claim 20 , wherein the virtually deformable object comprises a dispenser filled with a virtual liquid wherein the dispenser is configured to be squeezed in order to fill a virtual glass arranged underneath the dispenser with the virtual liquid until a maximum fill level has been reached.