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EP-4740913-A2 - PROSTHETIC WRIST JOINT

EP4740913A2EP 4740913 A2EP4740913 A2EP 4740913A2EP-4740913-A2

Abstract

The invention relates to a prosthetic wrist joint with a base (10) for attachment to a proximal prosthetic component and a pivoting part (20) which is pivotably mounted on the base (10) about a pivot axis (30), - with at least one fastening device (21) for fixing a distal prosthetic component or prosthetic hand to the pivoting part (20), wherein - at least one locking segment (22) with positive locking elements (23) arranged on it is arranged on the pivoting part (20) and - at least one locking element (40) is mounted longitudinally displaceable along the pivot axis (30) at the base (10), which can be moved from a locking position, in which the locking element (40) is engaged with a positive locking element (23) of the locking segment (22), into a release position against a spring force, wherein the locking element (40) has two release areas (41, 42) with which a first and a second release position is realized, the first release area (41) is arranged spaced apart in the displacement direction from the second release area (42), and a locking element (50) is assigned to the second release area (42) which holds the locking element (40) in the second release position, wherein the pivot part (20) is mounted pivotably at the base (10) against a spring force and is held in a starting position by at least one spring component (80) acting in opposite directions, wherein the spring component (80) is arranged at a stop (288) and the abutment (18) can be moved away from the stop (288) out of engagement with the spring component (80).

Inventors

  • HASLINGER, MARTIN
  • MITTELBERGER, Felix
  • Sagmeister, Luis

Assignees

  • Otto Bock Healthcare Products GmbH

Dates

Publication Date
20260513
Application Date
20221117

Claims (15)

  1. Prosthetic wrist with a base (10) for attachment to a proximal prosthetic component and a pivoting part (20) which is pivotably mounted on the base (10) about a pivoting axis (30), - with at least one fastening device (21) for fixing a distal prosthetic component or prosthetic hand to the pivoting part (20), wherein - at least one locking segment (22) with positive locking elements (23) arranged on it is arranged on the pivoting part (20) and - at least one locking element (40) is mounted longitudinally displaceable along the pivot axis (30) at the base (10), which can be moved from a locking position, in which the locking element (40) is engaged with a positive locking element (23) of the locking segment (22), into a release position against a spring force, wherein the locking element (40) has two release areas (41, 42) with which a first and a second release position is realized, the first release area (41) is arranged spaced apart from the second release area (42) in the direction of displacement, and a locking element (50) is assigned to the second release area (42) which holds the locking element (40) in the second release position, characterized in that the pivot part (20) is mounted pivotably at the base (10) against a spring force and is held in a starting position by at least one spring component (80) acting in opposite directions, wherein the spring component (80) is arranged at a stop (288) and the abutment (18) can be moved away from the stop (288) out of engagement with the spring component (80).
  2. Prosthetic wrist according to claim 1, characterized in that the locking element (40) in the first release position can be displaced into the second release position against the spring force and into the locking position by the spring force.
  3. Prosthetic wrist according to claim 1 or 2, characterized in that the spring force against displacement into the second release position is greater than the spring force against displacement into the first release position.
  4. Prosthetic wrist according to claim 3, characterized in that the spring force against displacement into the second release position at the beginning of the second release area (42) is 10% greater than the spring force against displacement of the first release area (41) at the end of the first release position.
  5. Prosthetic wrist according to one of the preceding claims, characterized in that the locking element (40) is supported against displacement into a release position relative to the base (10) by means of at least one spring element (60).
  6. Prosthetic wrist according to claim 5, characterized in that the spring element (60) is designed in two stages, with a graduated or progressive spring characteristic and/or that several spring elements are arranged to engage successively in the displacement direction of the locking element (40).
  7. Prosthetic wrist according to one of the preceding claims, characterized in that the locking element (40) is assigned two actuating elements (70) opposite each other in the direction of displacement.
  8. Prosthetic wrist according to one of the preceding claims, characterized in that two parallel oriented locking elements (40) are mounted on the base (10) on both sides of the pivot axis (30).
  9. Prosthetic wrist according to one of the preceding claims, characterized in that the release areas (41, 42) of the locking element (40) are designed as flattenings or reductions in diameter.
  10. Prosthetic wrist according to one of the preceding claims, characterized in that the locking segment (22) is designed in the shape of a circular segment.
  11. Prosthetic wrist according to one of the preceding claims, characterized in that the positive locking elements (23) are arranged or formed on the circumference of the locking segment (22).
  12. Prosthetic wrist according to one of the preceding claims, characterized in that the locking element (50) is spring-loaded in the direction of the locking element (40).
  13. Prosthetic wrist according to one of the preceding claims, characterized in that the locking element (40) has a positive locking component (45) with which the locking element (50) can be engaged.
  14. Prosthetic wrist according to one of the preceding claims, characterized in that the spring components (80) are arranged in recesses (28) on the base (10) or the pivot part (20) and are supported on abutments (18) on the respective opposite element.
  15. Prosthetic wrist according to claim 14, characterized in that the abutment (18) is designed as a bushing which is fixed to the locking segment (23) or the base (10).

Description

The invention relates to a prosthetic wrist with a base for attachment to a proximal prosthetic component and a pivoting part mounted on the base about a pivot axis, with at least one fastening device for fixing a distal prosthetic component or prosthetic hand to the pivoting part, wherein at least one locking segment with positive locking elements arranged thereon is arranged on the pivoting part and at least one locking element is mounted longitudinally displaceable along the pivot axis on the base, wherein the connecting element can be moved from a locking position, in which the locking element is in engagement with a positive locking element of the locking segment, into a release position against a spring force. Prostheses replace missing or lost limbs. Prosthetic joints connect two components of a prosthetic device and allow these components to pivot relative to each other. Prosthetic joints are known in the prior art in which the pivoting of two prosthetic parts relative to each other can be locked. Depending on the design of the prosthetic joints, locking and unlocking are achieved in different ways. For example, if a resistance device, such as a hydraulic damper, is arranged between an upper and lower joint part, the relative movement between the upper and lower parts can be achieved by locking the hydraulic line. Another method of locking and unlocking, used in simple, uniaxial joints, involves mechanical locking mechanisms that fix the joints in their respective angular positions relative to each other. When the locking mechanism is released and the distal prosthetic part is in an unlocked state, it is generally freely movable. With prosthetic wrists, this can cause the prosthetic hand to sag or fall in the direction of gravity. From the DE 10 2006 020 777 B4 A prosthetic wrist is known comprising a base and a coupling element associated with the base for attachment to a limb or prosthetic component, as well as a receiving device for a prosthetic hand pivotably connected to the base about at least one axis, wherein a locking device blocks the receiving device relative to the base. A retaining element is elastically pre-tensioned against the receiving device and, after the locking device is released, exerts a holding force on it. The receiving device has detent elements into which the retaining element engages in a locked position. The object of the present invention is to provide a prosthetic wrist that has a stable, robust and compact design and provides increased flexibility for the user. This problem is solved by a prosthetic wrist with the features of the main claim. Advantageous embodiments and further developments of the invention are disclosed in the dependent claims, the description, and the figures. The prosthetic wrist, comprising a base for attachment to a proximal prosthetic component and a pivoting element mounted on the base so as to be pivotable about a pivot axis, and with at least one fastening device for securing a distal prosthetic component or prosthetic hand to the pivoting element, wherein at least one locking segment with positive locking elements is arranged on the pivoting element and at least one locking element is mounted on the base so as to be longitudinally displaceable along the pivot axis, which can be moved from a locked position, in which the locking element is engaged with a positive locking element of the locking segment, to a release position against a spring force, provides that the locking element has two release areas with which a first and a second release position of the locking element is realized, and that the first release area is spaced apart from the second in the direction of displacement. The locking element is arranged in two release areas, and a locking element is assigned to the second release area, which holds the locking element in the second release position. The design of the longitudinally displaceable locking element with two release areas makes it possible to move the prosthetic wrist into the release position in several positions, starting from the locked position in which the locking element engages with one of the positive locking elements of the locking segment. The spring force that prevents the locking element from moving from the locked position to the release position is applied by a spring element that engages with the locking element. Against the spring force, the locking element is moved from the locked position to a first release position along the direction of the longitudinal orientation of the pivot axis until the first release area is positioned so that the first release position is present. In the first release position, the pivoting part can be rotated relative to the base, allowing, for example, the prosthetic hand to be moved from a neutral position to an angled position. If the actuating force is reduced or released against the spring force, the locking element returns to the locked position, so that the prosthetic w