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1. (WO2017111582) PROSTHETIC HAND
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

1. Prosthetic hand (1) with a wrist (13) and provided with a hand palm (2) and fingers (4) attached to the hand palm (2) , wherein the hand palm (2) and fingers (4) comprise bars (5) and joints (6) connecting the bars (5) forming a construction (7) supported by the wrist (13), wherein said bars (5) occupy a position with reference to each other depending on an external load applied to the construction (7), wherein a reaction force for said load applied to the construction (7) is provided by or through the wrist (13), char-acterized in that the construction (7) has an unloaded position wherein the fingers (4) are stretched and a plurality of loaded positions corresponding to loads applied to an inner side of the hand (1) wherein the construction (7) is deflected from the unloaded position wherein the fingers (4) are stretched into a series of loaded positions in which the fingers (4) are flexed into increasingly bended positions so as to eventually close the hand (1), and that said construction (7) is provided with a locking mechanism (9) to lock the construction (7) in one of the plurality of loaded positions.

2. Prosthetic hand according to claim 1, characterized in that the hand is sensitive to loads applied to the inner palm (2) and/or to the thumb (3) of the hand (1) .

3. Prosthetic hand (1) according to claim 1 or 2, characterized in that the locking mechanism comprises a ratchet mechanism (9) having at least one gear (10) with teeth (11) and a pawl (12', 12'') to lock the construction (7) in one of the plurality of loaded positions.

4. Prosthetic hand according to claim 3, characterized in that the ratchet mechanism (9) comprises two pawls (12', 12'') that cooperate with the teeth (11) of the at least one gear (10) wherein the two pawls (12', 12'') are arranged to intermittently engage said teeth (11) to lock the construction (7) in one of the plurality of loaded positions.

5. Prosthetic hand (1) according to claim 3 or 4, characterized in that the ratchet mechanism (9) comprises two adjacent gears (10) with teeth (11) wherein the pawl or pawls (12', 12'') are arranged to cooperate with said teeth (11) of both gears (10) for locking the construction (7} in one of its loaded positions, wherein the teeth (11) of the adjacent gears (10) are staggered such that the said gears (10) provide a phase shift with respect to each other in relation to the pawl or pawls (12', 12").

6. Prosthetic hand (1) according to claim 3 or 4, characterized in that unlocking the ratchet mechanism (9) re-leases the construction (7) to enable it to return to the unloaded position.

7. Prosthetic hand (1) according to any one of claims 3 - 6, characterized in that an extension (14) is provided on the pawl or pawls (12', 12''), and that the hand (1) has a switch (15) that is movable into a position wherein it will cooperate with the extension (14) when a load is applied to the construction (7) of the hand (1) to remove the pawl or pawls (12', 12'') from the teeth (11) of the gear (10) or gears .

8. Prosthetic hand (1) according to any one of claims 3 - 7, characterized in that at the side of the hand inner palm (2) the construction (7) is provided with bars (5', 5'') that are slidable with reference to each other and wherein distant extremities of said bars (5' , 5' ' ) are spring-loaded with a spring (16) to provide the bars (5' , 5''} with a preferential position wherein said extremities are closest to each other.

9. Prosthetic hand (1) according to any one of claims 3 - 8, characterized in that the hand is provided with multiple fingers (4) and a thumb (3), wherein the thumb (3) is mounted on a bar (5) of the construction (7) at the back of the hand.

10. Prosthetic hand (1) according to any one of claims 3 - 9, characterized in that the hand has four fingers (4), each of the four fingers (4) being embodied with a construction (7), wherein at least one of the fingers (4) is independently movable with respect to the other fingers.

11. Prosthetic hand (1) according to claim 10, char- acterized in that a bar (5''') of said at least one finger is through an intermediate swivel bar (5"'') mounted to a joint (17) at its base (18) .