Prothesenfuß

Abstract

The invention relates to a prosthetic foot (10) with a proximal fastening device (20) for fixing the prosthetic foot (10) to a prosthetic component (2) or a patient, with a holder (30) arranged distal to and connected with the fastening device (20), and with a spring assembly (40; 41, 42, 70) extending into a forefoot region (11) and coupled to the holder (30). The holder (30) is tiltably mounted on the spring assembly (40; 41, 42, 70) in the sagittal plane. A posterior limiting element (50) is arranged between the spring assembly (40; 41, 42, 70) and the holder (30), limiting displacement of the holder (30) away from the spring assembly (40; 41, 42, 70). (50) is mounted on the holder (30) on a movable support (35) and the support (35) is coupled to an actuator (60).

Description

[0001] The invention relates to a prosthetic foot with a proximal fastening device for fixing the prosthetic foot to a prosthetic component or a patient, with a holder arranged distal to the fastening device and connected to the fastening device, and a spring arrangement extending into a forefoot area and coupled to the holder, wherein the holder is tiltably mounted on the spring arrangement in the sagittal plane, and a posterior limiting element is arranged between the spring arrangement and the holder that limits displacement of the holder away from the spring arrangement.

[0002] Prosthetic feet and prosthetic foot inserts are part of a prosthetic fitting, for example, for below-knee amputees. To achieve the most natural appearance possible and to provide additional functionality, prosthetic feet can be covered or cosmetically finished, often with a plastic material. The prosthetic feet can be attached to an ankle joint or, without joints, to a lower leg tube or socket. The attachment device is usually a pyramid adapter, which allows for a variety of adjustments and orientations of the prosthetic foot relative to the proximal component, i.e., the lower leg tube, socket, or ankle joint. The attachment device is typically mounted on a holder connected to a spring extending in the forefoot direction.Examples of prosthetic feet are described in EP 2 420 212 A1, EP 1 976 463 A1, US 2005 / 0038525 A1 or US 2022 / 0087834 A1.

[0003] The object of the present invention is to provide a prosthetic foot that is easy to adjust with regard to stiffness.

[0004] This problem is solved by a prosthetic foot 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.

[0005] The prosthetic foot comprises a proximal attachment device for securing the prosthetic foot to a prosthetic component or a patient, a holder located distal to and connected to the attachment device, and a spring assembly extending into a forefoot region and coupled to the holder. The holder is tiltably mounted on the spring assembly in the sagittal plane, and a posterior limiting element is arranged between the spring assembly and the holder to restrict displacement of the holder away from the spring assembly. The limiting element is mounted on the holder on a displaceable support, and the support is coupled to an actuator. By displacing the support on the holder via the actuator, the stiffness of the prosthetic foot can be easily adjusted.For this purpose, the support on which the posterior limiting element is mounted is moved and / or rotated, thereby enabling stepless stiffness adjustment, particularly under forefoot load. This is achieved by changing the position of the limiting element's bearing point on the support.

[0006] In particular, the carrier is slidably and / or rotatably mounted on the holder and is designed, for example, as a slide or with a slide or a pivotable lever, thereby changing the position of the limiting element relative to the spring assembly at the proximal bearing point on the holder. Changing the position of the holder leads to a change in the activation of the spring assembly, allowing the stiffness to be adjusted under forefoot loading. Specifically, the carrier is movably mounted on the holder in the anterior-posterior direction. The position of the carrier, and thus of the proximal part of the limiting element, changes the preload between the holder and the spring assembly, and thus the spring behavior, enabling simple and quick adjustment of the stiffness and therefore the suspension characteristics of the prosthetic foot.Advantageously, the adjustment of the carrier's position on the holder is performed in a state where the limiting element is not subjected to a tensile load. Furthermore, due to the carrier's posterior positioning on the holder and the associated preload force oriented almost perpendicular to the adjustment direction, the forces acting on the actuator are low in the displacement direction. This means that only minimal drive forces are required to reposition the carrier. In addition, these geometric relationships reduce the mechanical loads on the actuator and its bearings. As a result, the entire prosthetic foot can be easily assembled and rapid adjustments can be made.

[0007] The prosthetic foot can be used both with and without a foot cosmetic insert. With a foot cosmetic insert, the prosthetic foot is referred to as a prosthetic foot insert. The foot cosmetic insert has an outer shape that closely resembles a natural foot and protects the inserted prosthetic foot from external influences. It can also provide additional cushioning and offers connection points for a lower leg cosmetic insert. The prosthetic foot can be used with or without a prosthetic foot cosmetic insert.

[0008] In one embodiment, the actuator for repositioning the carrier on or within the holder has a motorized drive or is designed as such. In particular, the actuator is designed as an electric motor or includes an electric motor that is coupled to the carrier, for example, via a gearbox. The electric motor can drive a gear, a spindle, a spindle nut, a roller, or another power transmission device to reposition the carrier. A corresponding driven component is arranged or formed on the carrier, for example, a spindle, a gear, a rack, a pinion, a cable, or the like. Instead of a motorized drive, especially via an electric motor, the actuator can also be designed as a manual drive, so that adjustment can be made, for example, via a dial, a lever, or the like.In one embodiment, a locking element is arranged on the carrier, which, for example, is spring-loaded and engages in a positive locking element in order to allow free movement or rotation of the carrier on the holder after unlocking and then to lock it in the desired position.

[0009] In a further training program, the actuator is integrated into the holder, enabling a modular design. The holder can be easily replaced, for example, by removing it from an existing swivel mount and replacing it with a holder equipped with an actuator. This makes it possible to retrofit an existing prosthetic foot and achieve easier adjustment of the stiffness for forefoot weight-bearing.

[0010] In one embodiment, the limiting element is designed as a flexible or telescopic tension element or as an articulated rod. The limiting element can be designed as a strap, rope, chain, wire, push sleeve, or a one-piece or multi-piece articulated rod, or as another flexible or articulated force transmission device. In a pressure-resistant design of the limiting element, it must be ensured that, under compressive load, for example, from a heel, the movement of the holder towards the ground is not restricted, provided such movement is possible and desired.

[0011] In one embodiment, the limiting element is pivotably and / or rotatably mounted on the carrier in order to avoid or introduce any or only minimal frictional forces, torsional forces or shear forces when the carrier is displaced relative to the holder or during use of the prosthetic foot when the holder tilts in the sagittal plane.

[0012] In one design, the prosthetic foot features several leaf springs that form, or are part of, the spring assembly. The spring assembly can also consist of just one spring. When several springs are combined into a single assembly, the range of applications and variations for adjusting elasticity or stiffness increases, making the prosthetic foot more versatile and easier to adapt to individual users and their needs.

[0013] In one embodiment, the spring assembly comprises a base spring designed as a distal spring, for example, a leaf spring. The base spring is coupled to at least one leaf spring in the forefoot region and, in the heel region, forms a gap between itself and the leaf spring when unloaded. This gap allows the base spring to deform elastically upon heel strike, thus reducing the distance between the holder and the base spring, at least in the heel region. This provides flexibility when the prosthetic foot strikes the ground, resulting in more comfortable use of the prosthetic foot.

[0014] In one embodiment, at least one spacer is arranged between the leaf spring and the base spring to ensure a specific distance between the springs at a particular point. In particular, the spacer is interchangeable and / or repositionable between the upper surface of the base spring and the lower surface of the leaf spring. The spacer is positioned at a distance from the heel end of the leaf spring in the anterior direction to allow free pivoting of the heel end. In a further embodiment, the spacer is multi-part and comprises at least a first and a second part, so that multiple contact points between the base spring and the leaf spring can be formed by the spacers, or the spacer parts can complement each other.By mounting the spring at several points spaced apart along its longitudinal axis, the contact positions can be individually adjusted to adapt the deformability and spring travel to the desired mechanical properties.

[0015] In one embodiment, the two parts of the multi-part spacer are displaceable relative to each other, with the two parts being attached to different springs between the base spring and the leaf spring. Thus, the first part can be fixed to the leaf spring and the second part movably attached to the base spring, or vice versa. It is also possible for both parts to be movably mounted on the leaf spring or the base spring, respectively. In a further embodiment, both parts are mounted on the leaf spring or the base spring, in particular movably or slidably, to allow for variable adjustment of the contact points between the spacer and the base spring and the leaf spring.

[0016] In one embodiment, the spacer is coupled to a motor drive or to the actuator for the carrier. When coupled to the actuator, the spacer can be moved both manually and by motor. A transmission can be implemented between the movement of the carrier and the movement of the spacer or its components, allowing for coordinated movement with the desired transmission ratio. The movement of the individual components can also be coupled in opposite directions, so that a rearward movement of the carrier can result in an anterior movement of the spacer or its components. Alternatively, the movement can be unidirectional.If the carrier is moved forward in an anterior direction, the spacers, or the spacer itself, are also moved in an anterior direction. The displacement paths are either the same or have a different transmission ratio.

[0017] The spacer components can have a contact surface that is curved or inclined relative to the substrate, so that a simple displacement of the components relative to each other can change the distance between the spacer and at least one component of the spring assembly. This results in a greater or lesser preload while the limiting element remains unchanged.

[0018] In one embodiment, the leaf springs are spaced apart from each other in the proximal-distal direction and thus have at least one proximal spring and one distal spring. The distal spring is curved and / or inclined towards the ground in an unloaded state, creating a gap between the two leaf springs that allows for flexibility under axial loading towards the ground.

[0019] The actuator is designed as a motor and coupled to a control unit, which in turn is coupled to sensors. Based on sensor readings, the actuator is activated, deactivated, or modulated. This makes it possible to adjust and adapt the wearer's position during walking based on sensor data, thus optimizing the flexibility and stiffness of the prosthetic foot under varying walking conditions.

[0020] All embodiments, further developments and variants, insofar as they are not technically mutually exclusive, are combined with each other and individually the subject of the invention.

[0021] Exemplary embodiments of the invention are explained in more detail below with reference to the figures. The figures show: Fig. 1 - a schematic representation of a prosthetic foot in side view; Fig. 2 - a perspective exploded view of the prosthetic foot according to Fig. 1; Fig. 3 - Detailed views with a multi-part spacer; Fig. 4 - a schematic representation of the storage situation; Fig. 5 - a variant of the Fig. 4; Fig. 6 - a schematic representation with a driven spacer; Fig. 7 - a top view of a movable spacer; Fig. 8 - a perspective, partially cutaway view of a variant of the prosthetic foot; Fig. 9 - a schematic side view of a variant of the Fig. 8; as well as Fig. 10 - a detailed view showing a boundary element as a joint rod.

[0022] Fig. Figure 1 shows a perspective side view of a prosthetic foot 10 with a proximal attachment device 20 in the form of a pyramid adapter, which is arranged on a holder 30. The holder 30, for example made of a plastic or a light metal, is pivotably mounted on a bolt about a pivot axis 31 relative to a spring assembly 40. In the illustrated embodiment, the spring assembly 40 is formed from three springs 41, 42, 70, each designed as a leaf spring. The spring assembly 40 has a base spring 70, which is arranged at the distal end region of the prosthetic foot 10. The base spring 70 is mounted in a front receiving element 100 at the front end region. Another leaf spring 42 is arranged on the front receiving element 100 and is fixed to it at a distance proximal to the base spring 70. The leaf spring 42 is part of a double spring of the spring assembly 40 and is the distal component of the double spring.The holder 30 is pivotably mounted on the proximal leaf spring 41. The two leaf springs 41, 42 are also spaced apart from each other, creating a gap between them to allow the holder 30 to move relative to the distal leaf spring 42. The distal leaf spring 42 is positioned midway between the base spring 70 and the proximal leaf spring 41. The proximal leaf spring 41 is also mounted on the front receiving element 100. In the illustrated embodiment, the two leaf springs 41, 42 are curved and arranged biconvexly relative to each other, resulting in a slightly elliptical gap between them.

[0023] A spacer 80 is arranged between the distal leaf spring 42 and the base spring 70, positioned in the front third of the leaf spring 70. This creates a gap between the posterior end of the distal leaf spring 42 and the posterior end of the base spring 70, into which the holder 30 and the proximal attachment device 20 can spring when heel pressure is applied to the prosthetic foot 10.

[0024] A support 35 is arranged on the holder 30 and extends beyond the posterior end of the holder 30. A posterior, essentially tensile-rigid, non-elastic limiting element 50 is arranged on the support 35. In the illustrated embodiment, this limiting element is designed as a strap that is guided around a bolt serving as the proximal bearing point 51. The distal end of the limiting element 50 is arranged on a posterior receiving element 110, and a distal deformation element 52 may be arranged in the strap in a double-layered section to achieve additional compliance. The support 35 is displaceable on the holder 30 in the anterior-posterior direction, as indicated by the double arrow. Similarly, in the dashed line illustration, the support 35 is extended in the posterior direction.This is achieved via an actuator 60, which in the illustrated embodiment is designed as an electric motor that drives a spindle mounted in a fixed thread arranged or formed in the support 35. The thread is rotationally fixed to the support 35, so that rotation of the spindle leads to a displacement of the support 35 in an anterior-posterior direction. When the rotational movement is reversed, the proximal bearing point 51 is moved in the opposite direction. The displacement of the support 35 changes the orientation of the limiting element 50 and the distance between the posterior end of the proximal spring 41 and the base spring 70, resulting in a change in the preload within the limiting element 50 exerted by the spring assembly 40. In the illustrated unloaded state, the limiting element 50 is under preload.The limiting element 50 is positioned around the proximal bearing point 51 without being rotationally fixed to it, allowing the fastening element 50 to slide around the bolt. This eliminates shear or torsional forces that the actuator 60 must overcome. The preload force acts essentially perpendicular to the displacement direction of the support 35, enabling the actuator 60 to be operated with comparatively low power to move the support 35 forward or backward. As an alternative to a motorized actuator 60, it can also be operated manually, for example, via a rotary knob, a crank, a lever, or a lockable and unlockable slider.

[0025] In the Fig. Figure 2 shows a perspective exploded view of the prosthetic foot 10 according to Fig. 1 shown. In the Fig. Figure 2 shows that the holder 30 has a bore at its front, lower end through which the bearing pin is guided. This pin is fixed to a bearing block on the top of the spring assembly 40, specifically on the top of the proximal spring 41. The holder 30 has a rear section that provides a receiving space for the drive 60, in the form of an electric motor, and the support 35. The support 35 is designed as a slide mounted in rails that are inserted into the rear section of the holder 30. The drive 60 is mounted in the holder 30 via two bearing shells and has a spindle 61 with an external thread, which is mounted in a threaded insert 36 with an internal thread.The threaded insert 36 is fixed or arranged in the carrier 35 in a rotationally fixed and axially immovable manner, such that when the spindle 61 rotates, the carrier 35, designed as a slide, is displaced in the guide rails in one direction or the other. The bolt 51 is arranged on the underside of the carrier 35 as a proximal bearing point, around which the upper, loop-like end of the limiting element 50 engages. The drive 60, as a motor drive, can be coupled to sensors (not shown) on the prosthetic base 10 or on another prosthetic device, which transmit sensor data to a control unit that, based on the sensor data, activates, deactivates, or modulates the drive 60.

[0026] Between the two leaf springs 41 and 42, spacer elements are arranged at the front and rear ends, respectively. These spacers can be rigid or elastic and ensure a distance between the slightly curved leaf springs 41 and 42. The spacer 80 is visible between the underside of the distal leaf spring 42 and the upper side of the base spring 70. In the illustrated embodiment, it is fixed in the front foot area. In addition to the spacer 80, a spacer element is arranged between the base spring 70 and the distal leaf spring 42 in the front receiving element 100, which also has a rolling contour.

[0027] In the Fig. Figure 3 shows three different embodiments of the spacer 80, wherein in all three embodiments the spacer 80 has two spacer elements arranged between the distal leaf spring 42 and the base spring 70. In addition to the stationary, front spacer, a second spacer with two parts 81, 82 is arranged in a posterior direction to the stationary spacer. In the illustrated upper embodiment, the first part 81 is fixedly arranged on the underside of the distal leaf spring 42, while the second part 82 is slidably arranged on the base spring 70 in the anterior and posterior directions. The slidability is indicated by the two arrows.The first, proximal part 81 of the multi-part, second spacer has a distal surface shaped such that when the second, distal part 82 of the spacer is displaced, there is no change in the preload in the limiting element not shown, i.e., the distance between the top of the base spring 70 and the distal surface of the first part 81 of the spacer remains constant.

[0028] In the middle illustration, the contact surface 810 of the first part 81 is designed such that the distance to the top of the base spring 70 increases in the posterior direction, so that when the second part 82 is displaced in the posterior direction, the distal spring 82 moves towards the base spring 70, thereby reducing the preload within the limiting element. Conversely, in the lower illustration, the Fig. 3. The contour of the contact surface 810 is designed such that the distance to the upper side of the base spring 70 decreases in the posterior direction, so that when the second part 82 is displaced towards the heel, the contact surface 820 slides along the contact surface 810 of the first part 81, causing an increase in tension in the distal spring 42. This changes the preload in the limiting element 30. In addition to changing the preload with a corresponding contour of the contact surfaces 810, 820, a second bearing point of the distal spring 42 is formed on the spacer 80, spaced apart from the first, stationary spacer 80, thereby changing the spring characteristics of the distal leaf spring 42.

[0029] In the Fig. Figure 4 illustrates the adjustability of the positions of the spacers, specifically the two parts 81 and 82 of the spacer 80. In addition to the front clamping of the distal spring and the base spring in the front receiving element 100, a first bearing is provided on the first, front part 81 of the two-part spacer. The position of the second, posterior part 82 of the spacer is adjustable. Depending on the position of the second part 82, the spring behavior changes under heel load, resulting in a three-point bearing, a load-dependent three-point bearing, or a four-point bearing on the distal spring 42. The front end is fixed to the receiving element 100, while the rear end is moved by the introduction of an axial force at point P when the heel strikes the ground. hThe heel area is loaded, and the spacer 80 forms the third support point. Under light load, the distal spring 42 will not come into contact with the second part 82, so the spring is subjected to bending stress under a three-point support. This is in the Fig. 4 shown. If the heel load exceeds P h When a limit is reached, the spring 42 comes into contact with the second part 82, thus forming a four-point bearing, which in the Fig. Figure 5 shows that the distal spring 42 now acts over a shorter lever arm, resulting in increased stiffness. A three-point bearing, as shown in the Fig. As shown in Figure 4, the first contact point is positioned relatively far forward, resulting in lower stiffness and a softer feel. However, above a certain threshold and under higher loads, the second, posterior contact point comes into contact, providing increased stiffness due to the shorter lever arm. Thus, a three-point or four-point support system is achievable, depending on the load on the prosthetic foot. These varying stiffnesses depending on the load are advantageous for a prosthetic foot, as a gentle initial heel strike followed by a progressive response is typically desired. By specifying or adjusting the position of the second contact point, the load threshold can be lowered or raised and adapted to the individual user.

[0030] In the Fig. Figure 6 shows an embodiment of the prosthetic foot in which the spacer 80 is slidably mounted on the base spring. An actuator 60, which can be an electric motor or alternatively manually operated, moves the spacer 80 in an anterior-posterior direction via a force transmission device 62, for example, a Bowden cable. The actuator 60 acts on the force transmission element 62, exerting a tensile force in the posterior direction on the spacer 80. This tensions a return spring 64. To move the prosthetic foot in the anterior direction, the actuator 60 is reversed, the force transmission element 62 (for example, a cable) is released, and the return spring 64 relaxes and pulls the spacer 80 forward. The actuator 60 can also be used to move the support (not shown) relative to the holder 20.

[0031] In the Fig. 7 is the one in the Fig. Figure 6 illustrates the described functionality in a top view, wherein in this embodiment the spacer 80 is formed in two parts with a first, anterior part 81 and a second, posterior part 82, which can be displaced relative to each other. The anterior part 81 of the spacer 80 is stationary and arranged on both sides to form a guide element, on which the return spring 64 is arranged at the anterior end and the second, posterior part 82 of the spacer 80 is arranged at the posterior end. In the left illustration, the return spring 64 is relaxed and the second part 82 is almost in contact with the first part 81. This provides an overall rather soft, compliant mounting of the holder 30 due to the comparatively long lever arm. If the second part 82 is displaced towards the heel by the drive 60 (not shown), as in the right illustration of the Fig. As shown in Figure 7, the effective lever arm of the distal leaf spring 42 is shortened, thereby reducing compliance and increasing stiffness. The adjustment and reset of the second part 82 on the base spring 70 can also be performed while walking.

[0032] In the Fig. Figure 8 shows an embodiment of the prosthetic foot in which a single drive 60, designed as a motor drive, moves both the second part 82 of the spacer 80 and the carrier 35. The drive 60 is arranged in the holder 30 and has an output spindle designed as a worm gear that meshes with a worm wheel 65, on which a roller for winding the power transmission element 62 in the form of a cable is arranged. Simultaneously, the worm wheel 65 meshes with a rack (not shown) in the holder 30, so that a posterior displacement of the carrier 35 occurs, since the worm wheel 65 is mounted on the carrier 35 and the rack is fixed to the holder 30. The worm gear 65 thus moves in a posterior direction together with the carrier 35, on which the drive 60 is also mounted, and simultaneously winds up the cable 62.If the direction of rotation is reversed, the carrier 35 with the worm gear and the roller moves forward and the return spring 64 (not shown) pulls the second part 82 of the spacer forward again.

[0033] In the Fig. Figure 9 shows a sectional view of an alternative drive assembly with a different design of the spring arrangement 40. Instead of a double spring, there is only a single roof spring, which is mounted at a distance from the base spring 70. The second part 82 of the spacer is elastically mounted on the receiving element 100 via the return spring 64; the force transmission element 62 is not shown. This differs from the assembly in the Fig. The holder 30 is equipped with two motorized drives 60. A first motorized drive in the upper part of the holder is configured for moving the second part 82 of the spacer; the worm gear and roller are driven via the spindle. Below, at the level of the pivot axis 31 of the holder 30, the second drive 60, with its spindle and thread, is designed to move the support 35 in a posterior-anterior direction. The drives can also be operated manually.

[0034] In the Fig.Figure 10 shows a different embodiment of the limiting element 50. Instead of a flexible, essentially inelastic strap or cable, a hinged rod is arranged at the posterior end of the holder 30, in which the distal bearing point can also be slidably mounted to allow the spring assembly 40 to compress. It is also possible to design the limiting element 50 from two rods that are articulated to one another, so that in the event of a compressive load the two hinged rods can pivot relative to each other. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 2 420 212 A1

[0002] EP 1 976 463 A1

[0002] US 2005 / 0038525 A1

[0002] US 2022 / 0087834 A1

[0002]

Claims

[1] Prosthetic foot (10) with a proximal attachment device (20) for fixing the prosthetic foot (10) to a prosthetic component (2) or a patient, with a holder (30) arranged distal to and connected with the fastening device (20) and with a spring arrangement (40; 41, 42, 70) which extends into a forefoot area (11) and is coupled to the holder (30), The holder (30) is tiltably mounted on the spring assembly (40; 41, 42, 70) in the sagittal plane, wherein a posterior limiting element (50) is arranged between the spring assembly (40; 41, 42, 70) and the holder (30), which limits a displacement of the holder (30) away from the spring assembly (40; 41, 42, 70), characterized by , that the limiting element (50) is mounted on the holder (30) on a movable support (35) and the support (35) is coupled to an actuator (60). [2] Prosthetic foot according to claim 1, characterized by that the carrier (35) is mounted on the holder (30) in a slidable or rotatable manner. [3] Prosthetic foot according to claim 1 or 2, characterized by , that the support (35) is mounted in a way that allows displacement in the anterior-posterior direction. [4] Prosthetic foot according to one of the preceding claims, characterized by , that the actuator (60) is a motorized or manual drive. [5] Prosthetic foot according to any of the preceding claims, characterized by , that the actuator (60) is integrated into the holder (30). [6] Prosthetic foot according to one of the preceding claims, characterized by , that the limiting element (50) is designed as a flexible or telescopic tension element or articulated rod. [7] Prosthetic foot according to any of the preceding claims, characterized by , that the limiting element (50) is pivotably and / or rotatably mounted on the support (35). [8] Prosthetic foot according to one of the preceding claims, characterized by , that the spring arrangement (40) has several leaf springs (41, 42, 70). [9] Prosthetic foot according to any of the preceding claims, characterized by , that the spring arrangement (40) has a base spring (70) which is coupled in a forefoot area with at least one leaf spring (41, 42) and forms a distance to the leaf spring (41, 42) in a heel area in a relieved state. [10] Prosthetic foot according to claim 9, characterized by , that at least one spacer (80) is arranged between the leaf spring (41, 42) and the base spring (70). [11] Prosthetic foot according to claim 10, characterized by , that the spacer (80) is arranged to be replaceable and / or repositionable between the top of the base spring (70) and the bottom of the leaf spring (41, 42). [12] Prosthetic foot according to claim 10 or 11, characterized by, that the spacer (80) is formed in multiple parts and has at least a first part (81) and a second part (82). [13] Prosthetic foot according to claim 12, characterized by , that at least one of the two parts (81, 82) is mounted in a manner that allows displacement relative to the other part. [14] Prosthetic foot according to claim 12 or 13, characterized by , that the first part (81) is fixedly arranged on the leaf spring (41, 42) or the base spring (70) and the second part (82) is movably mounted on the base spring (70) or the leaf spring (41, 42) on which the first part (81) is not located. [15] Prosthetic foot according to claim 12, 13 or 14, characterized by , that the two parts (81, 82) are mounted on the leaf spring (41, 42) or the base spring (70). [16] Prosthetic foot according to any one of claims 10 to 15, characterized by , that the spacer (80) is coupled with a separate motor drive (61) or with the actuator (60) for the carrier (35). [17] Prosthetic foot according to any one of claims 12 to 16, characterized by , that at least one of the two parts (81, 82) has a contact surface (810, 820) that is curved or inclined relative to the substrate. [18] Prosthetic foot according to claim 8, characterized by , that the leaf springs (41, 42) are spaced apart from each other in the proximal-distal direction and a distal spring (42) is curved and / or inclined towards the substrate in the unloaded state. [19] Prosthetic foot according to any of the preceding claims, characterized by , that the actuator (60) is motorized and coupled to a control device (90) which is coupled to sensors (92) and activates, deactivates and / or modulates the actuator (60) based on sensor values.

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