Shock absorption apparatus

Abstract

The present disclosure relates to a shock absorption apparatus (1) extending along an axis (A) and comprising a first part (10) adapted to be attached to a first prosthetic element (2), a second part (20) adapted to be attached a second prosthetic element (3); wherein the first part (10) and the second part (20) are moveable relative to each other. The shock absorption apparatus (1) further comprises a bumper assembly (30) for damping a relative movement between the first part (10) and the second part (20), the bumper assembly (30) being arranged between the first part (10) and the second part (20). The first part (10) and the second part (20) together form a housing (5) configured to envelope the bumper assembly (30), the bumper assembly (30) being arranged in the housing (5). The bumper assembly (30) has a first end (31) and a second end (32), and comprises at least one resilient member; and wherein the bumper assembly (30) has an axial through-hole (33) along axis (A). The shock absorption apparatus (1) further comprises a connecting member (40) being arranged in the axial through-hole (33) of the bumper assembly 30) and extending along the axis (A), and the connecting member (40) being arranged in the housing (5) and configured to moveably connect the first part (10) and the second part (20). The present disclosure also relates to a prosthetic foot assembly (80) comprising the shock absorption apparatus (1).

Description

[0001] W152230011

[0002] 1

[0003] SHOCK ABSORPTION APPARATUS

[0004] TECHNICAL FIELD

[0005] The present disclosure relates to a shock absorption apparatus that can be attached to a prosthetic element, such as a foot. The present disclosure also relates to a prosthetic foot assembly comprising the shock absorption apparatus.

[0006] BACKGROUND

[0007] Artificial limbs, or prostheses, have been used by amputees for many centuries. From their beginnings, they have evolved from crudely shaped sticks, pegs or hooks, into sophisticated electro-mechanical equipment, occasionally incorporating servomotors and micro-processors to produce more natural limb movement. However, even given such development, problems remain in the means for damping a compressing axial force, which occurs during activities such as walking and jumping. Adequate damping will lead to the prosthesis resembling a natural limb and will provide for a safer and more comfortable prosthesis.

[0008] Different shock absorption apparatuses have been developed. However, there is a need for an improved shock absorption apparatus and especially a shock absorption apparatus that provides adequate damping and at the same time is suitable to be provided with cosmetics.

[0009] SUMMARY

[0010] An object of the present disclosure is to eliminate or at least mitigate the drawbacks of prior art systems. According to a first aspect, the above and other objects of the invention are achieved, in full or at least in part by a shock absorption apparatus as defined by claim 1. According to this claim, the above object is achieved by a shock absorption apparatus extending along an axis (A), the shock absorption apparatus comprising a first part adapted to be attached to a first prosthetic element, a second part adapted to be attached a secondW152230011

[0011] 2

[0012] prosthetic element, wherein the first part and the second part are moveable relative to each other. The shock absorption apparatus further comprises a bumper assembly for damping a relative movement between the first part and the second part, the bumper assembly being arranged between the first part and the second part. The first part and the second part together form a housing configured to envelope the bumper assembly, the bumper assembly being arranged in the housing. The bumper assembly has a first end and a second end and comprises at least one resilient member; and wherein the bumper assembly has an axial through-hole along axis (A). The shock absorption apparatus further comprises a connecting member being arranged in the axial through-hole of the bumper assembly and extending along the axis (A), and the connecting member being arranged in the housing and configured to moveably connect the first part and the second part. Such a shock absorption apparatus provides a smooth damping of compressing axial forces. Furthermore, due to its configuration, the diameter of the shock absorption apparatus is quite small, allowing the addition of cosmetics to a prosthetic assembly comprising the shock absorption apparatus.

[0013] The first part and the second part are axially moveable relative to each other along axis (A).

[0014] Specifically, the bumper assembly damps a relative axial movement along axis (A) between the first part and the second part, In addition, the bumper assembly may also damp a relative rotational movement between the first part and the second part around axis (A),

[0015] The bumper assembly may also be referred to as a damper assembly and a bumper may also be referred to as a damper.

[0016] According to one embodiment, the connecting member has a length (L) and the bumper assembly has a length (I); wherein the length (L) is equal or greater than the length (I). In other words, the connecting member extends along axis (A) through the bumper assembly from the first end of the bumper assembly to at least the second end of the bumper assembly.W152230011

[0017] 3

[0018] According to one embodiment, the connecting member is mounted to the first part and / or to the second part. Alternatively, the connecting member may be an integral part of the first part or of the second part.

[0019] According to another embodiment, the connecting member is deformable. According to a further embodiment, the connecting member is a connecting pin.

[0020] According to yet another embodiment, the connecting pin has a first end portion being slidably arranged in the first part or in the second part; and a second end portion being fixed to the other part of the first part and the second part.

[0021] According to one embodiment, the first part comprises a first end and an opposite second end, wherein the first end is adapted to be attached to the first prosthetic element, and wherein the second end has an axial aperture, the aperture having an inner surface, wherein a portion of the inner surface is in abutment with the bumper assembly; and the second part comprises a first end and an opposite second end, the second end being adapted to be attached to the second prosthetic element, and wherein the first end has an axial aperture having an inner surface, wherein a portion of the inner surface is in abutment with the bumper assembly.

[0022] According to another embodiment, the second end of the first part has a substantially cylindrical configuration having an outer diameter and an inner diameter; and the first end of the second part has an outer diameter that is smaller than the inner diameter of the second end of the first part.

[0023] According to yet another embodiment, the first part comprises an axially extending locking portion and the bumper assembly has a corresponding axially extending locking part, wherein the locking portion and the locking part are configured to be in engagement with each other for controlling rotational movement about the axis (A) between the first part and the second part.

[0024] According to a further embodiment, in the first part, a portion of the inner surface of the aperture is formed as at least one first protrusion extending towards the second part, and configured to be in engagement with at least oneW152230011

[0025] 4

[0026] corresponding recess of the bumper assembly for controlling relative rotational movement about the axis (A) between the first part and the second part.

[0027] Preferably, the bumper assembly has two first recesses adapted to receive corresponding first protrusions protruding from the inner surface of the aperture of the first part. Preferably, the two first recesses are positioned opposite one each other.

[0028] According to one embodiment, the second part has at least one inner recess extending radially outwards for slidingly receiving at least one first protrusion protruding from the inner surface of the aperture of the first part.

[0029] According to a further embodiment, the bumper assembly is precompressed.

[0030] According to another embodiment, at least an end portion of the second end of the bumper assembly is tapered.

[0031] According to yet another embodiment, the first end and the second end of the bumper assembly have different stiffness.

[0032] According to one embodiment, the bumper assembly comprises at least two resilient members having different stiffness.

[0033] According to a further embodiment, at least an end portion of the second end of the bumper assembly is arranged in the aperture of the second part.

[0034] According to yet another embodiment, the bumper assembly has at least one first recess adapted to receive at least one first protrusion protruding from the inner surface of the aperture of the first part. Preferably, the bumper assembly has two first recesses adapted to receive corresponding first protrusions protruding from the inner surface of the aperture of the first part. Preferably, the two first recesses are positioned opposite one each other.

[0035] According to one embodiment, the bumper assembly has at least one second recess adapted to receive a second inner protrusion extending radially inwards from the inner surface of the aperture of the second part. Preferably, the bumper assembly has two second recesses adapted to receive corresponding second protrusions extending radially inwards from the innerW152230011

[0036] 5

[0037] surface of the aperture of the second part. Preferably, the two second recesses are positioned opposite one each other.

[0038] According to yet another embodiment, a wing is formed in the bumper assembly between the first recess and the second recess, wherein the wing is configured to be deformed when the shock absorption apparatus is subjected to a rotational force and thereby damp relative rotational movement about the axis (A) between the first part and the second part.

[0039] According to a further embodiment, the shock absorption apparatus further comprises a bushing disposed between the inner surface of the second end of the first part and the first end of the second part.

[0040] According to another embodiment, the second part comprises an evacuation channel for air and / or water, wherein the evacuation channel connects the aperture of the first end of the second part to the outside of the housing.

[0041] A second aspect of the present disclosure relates to a prosthetic foot assembly comprising a shock absorption apparatus according to any one of claims 1-19.

[0042] Other objectives, features and advantages of the present disclosure will appear from the following detailed description as well as from the attached claims. It is noted that the disclosure relates to all possible combinations of features.

[0043] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to “a / an / the [component, means, element, etc.]” are to be interpreted openly as referring to at least one instance of said component, means, element, etc., unless explicitly stated otherwise.

[0044] As used herein, the term “comprising” and variations of that term are not intended to exclude other components, means, elements or integers.

[0045] As used herein, the term “damping” and variants thereof refers to the reduction, attenuation, suppression and / or absorption of a force.W152230011

[0046] 6

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] In the following detailed description, references to the following figures will be made. Note that the figures are schematic and some parts of the shock absorption apparatus may have been omitted, which are obvious to a professional in the technical field in which shock absorption apparatus is included.

[0049] Figs. 1a (side view) and 1b (perspective view) show a prosthetic limb comprising a first prosthetic element and a second prosthetic element interconnected by a shock absorption apparatus according to the present disclosure.

[0050] Fig. 2a (side view) and 2b (perspective view) show an exploded view of one embodiment of a shock absorption apparatus according to the present disclosure.

[0051] Fig. 3 is a side view of a connecting pin.

[0052] Fig. 4a is a side cross-sectional view of one embodiment of the first part of the shock absorption apparatus.

[0053] Fig. 4b is a side cross-sectional view of one embodiment of the first part of a shock absorption apparatus according to the present disclosure.

[0054] Fig. 4c is a view along axis (A) of one embodiment of the second end of the first part of the shock absorption.

[0055] Fig. 4d is a perspective view of one embodiment of the second end of the first part of the shock absorption apparatus.

[0056] Fig. 5a is a side cross-sectional view of one embodiment of the second part of a shock absorption apparatus according to the present disclosure.

[0057] Fig. 5b is a side cross-sectional view of one embodiment of the second part of a shock absorption apparatus according to the present disclosure.

[0058] Fig. 5c is a side cross-sectional view of one embodiment of the second part of a shock absorption apparatus according to the present disclosure.

[0059] Fig. 5d is a view along axis (A) of one embodiment of the first end of the second part of the shock absorption apparatus.

[0060] Figs. 6a-f show perspective views of different bumper assemblies.W152230011

[0061] 7

[0062] Fig. 7a is a side cross-sectional view of one embodiment of the shock absorption apparatus in its unloaded state.

[0063] Fig. 7b is a perspective view of one embodiment of the shock absorption apparatus in its unloaded state.

[0064] Fig. 8a is a side cross-sectional view of one embodiment of the shock absorption apparatus in its loaded state.

[0065] Fig. 8b is a perspective view of one embodiment of the shock absorption apparatus in its loaded state.

[0066] Fig. 9a is a view along axis (A) of one embodiment of the first end of the second part of the shock absorption apparatus in its unloaded state.

[0067] Fig. 9b is a view along axis (A) of one embodiment of the first end of the second part of the shock absorption apparatus in its loaded state.

[0068] Fig. 10a is a side cross-sectional view of one embodiment of the shock absorption apparatus in its unloaded state.

[0069] Fig. 10b is a perspective view of the of one embodiment of the first end of the second part of the shock absorption apparatus.

[0070] Fig. 11 is an exploded view of a prosthetic foot comprising the shock absorption apparatus according to the present disclosure.

[0071] DETAILED DESCRIPTION

[0072] The shock absorption apparatus 1 according to the present disclosure will be described in a non-limiting way and in more detail with reference to exemplary embodiments illustrated in the enclosed drawings. It is to be understood that other embodiments are contemplated and may be made without departing from the scope or spirit of the present teachings. The following detailed description, therefore, is not to be taken in a limiting sense.

[0073] A shock absorption apparatus 1 according to the present inventions is typically arranged between two prosthetic elements 2, 3 (see Figs. 1a and 1b). Typically, one of the prosthetic elements 2, 3 is a lower limb prosthetic part, preferably a prosthetic foot 3. The second part 20 may be attached to a prosthetic foot 3, by means of screws 6 or bolts 6.W152230011

[0074] 8

[0075] The shock absorption apparatus 1 damps the force of a stride and provides for a more natural feeling during walking and reduces or prevents the force from the stride to travel along the prosthesis and into the stump of the person wearing the prosthesis. Typically, the shock absorption apparatus 1 damps a compressing axial force compressing the first part 10 towards the second part 20. Such a force is herein also referred to as a “compressing axial force” or, in short, “axial force”. Certain embodiments also damp rotational or torsional force exerted on the shock absorption apparatus.

[0076] Typically, the first part 10 and the second part 20 may be made from titanium. Titanium provides strength and endurance, while at the same time resulting in a rather light-weight shock absorption apparatus 1. The weight of such a shock absorption apparatus 1 made from titanium is typically about 300 g.

[0077] The first part 10 and the second part 20 may alternatively be made from stainless steel. However, such a shock absorption apparatus 1 will be heavier than a shock absorption apparatus 1 made of titanium.

[0078] Different embodiments of the shock absorption apparatus 1 can be envisioned.

[0079] The shock absorption apparatus 1 according to the present disclosure damps compressing axial forces, such as during a heel stride or during landing after a jump. Further, the shock absorption apparatus 1 may also damp a rotational (or torsional) force. In other words, the bumper assembly 30 damps a relative axial movement along axis (A) between the first part 10 and the second part 20, In addition, the bumper assembly 30 may also damp a relative rotational movement between the first part 10 and the second part 20 around axis (A),

[0080] In short, referring to Figs. 2a and 2b, the shock absorption apparatus 1 according to the present disclosure comprises a first part 10 adapted to be attached to a first prosthetic element 2 and a second part 20 adapted to be attached to a second prosthetic element 3. The first part 10 and the second part 20 are movable in relation to each other. Typically, the first part 10 and theW152230011

[0081] 9

[0082] second part 20 are axially movable along an axis (A) in relation to each other. The shock absorption apparatus 1 further comprises a bumper assembly 30 for damping a relative movement between the first part 10 and the second part 20. The bumper assembly 30 is arranged between the first part 10 and the second part 20. The first part 10 and the second part 20 together form a housing 5 (shown in Figs. 7a-b, 8a-b and 10a) configured to envelope the bumper assembly 30. The bumper assembly 30 is arranged in the housing 5. Thus, the bumper assembly 30 is not exposed to the environment, but is protected within the housing. In this way, the bumper assembly is protected from e.g. sunlight, dust and debris, such as e.g. sand. Further, water from a moist environment is also prevented or limited from coming into contact with the bumper assembly 30. The bumper assembly 30 has a first end 31 and a second end 32 and comprises at least one resilient member. The bumper assembly 30 has a through-hole 33 along axis (A). The shock absorption apparatus 1 according to the present disclosure further comprises a connecting member 40. The connecting member 40 is arranged in the axial through-hole of the bumper assembly 30 and extends along the axis (A). Thus, the connecting member 40 is arranged in the housing 5 formed by the first part 10 and the second part 20 (see Figs. 7a-b, 8a-b and 10a). The connection member 40 is configured to moveably connect the first part 10 and the second part 20. The connecting member 40 has a length (L) and the bumper assembly 30 has a length (I).

[0083] Preferably, the length (L) is equal or greater than the length (I). In other words, the connecting member 40 preferably extends along axis (A) through the bumper assembly 30 from the first end 31 of the bumper assembly 30 to at least the second end 32 of the bumper assembly 30. In specific embodiments, the length (L) is greater than the length (I).

[0084] When a compressing force is exerted on the shock absorption apparatus 1 , such as during a step or stride or during landing, the first part 10 moves towards the second part 20. The relative axial movement between the first part 10 and the second part 20 is limited axially by the bumper assembly 30.W152230011

[0085] 10

[0086] Specific properties and advantages of different parts that may be comprised in a shock absorption apparatus 1 according to the present disclosure are discussed below. The skilled person understands that the different parts and features thereof may be combined in different ways.

[0087] Further, specific embodiments of the shock absorption apparatus 1 according to the present disclosure are described in detail.

[0088] The shock absorption apparatus 1 described herein is preferably configured to be part of a prosthetic limb, and specifically for being attached to a prosthetic foot 3. However, the shock absorption apparatus 1 may also be attached between other parts of a prosthetic leg, such as between a pylon and a socket, wherein the socket is in contact with the stump. The same concepts and methods described may be similarly used for other prosthetic devices and are not limited solely to the anatomical locations discussed.

[0089] Generally, the first part 10 is attached to a prosthetic element that is connected to the stump of the person wearing the prosthesis and the second part 20 is the part that is attached to a prosthetic foot 3. However, if desired, the shock absorption apparatus 1 according to the present disclosure may also be used “upside-down” such that the first part 10 is attached to a prosthetic foot 3.

[0090] The first part 10 may be adapted to be attached to a first prosthetic element 2 by means of e.g. 4-hole linking plates, 4-hole male pyramids, 4-hole female pyramids, 4-hole pyramid receiver adapters, female double adapter, male double adapter, male-female double adapter, Sach foot adapter, female pylons, male adapters, female adapters, male tube clamps, female tube clamps, and / or 4-hole tube clamps. The first part 10 may be attached to a prosthetic foot 3, by means of screws 6 or bolts 6.

[0091] The second part 20 may be adapted to be attached to a second prosthetic element 3 by means of e.g. 4-hole linking plates, 4-hole male pyramids, 4-hole female pyramids, 4-hole pyramid receiver adapters, female double adapter, male double adapter, male-female double adapter, Sach foot adapter, female pylons, male adapters, female adapters, male tube clamps, female tube clamps,W152230011

[0092] 11

[0093] and / or 4-hole tube clamps. The second part 20 may be attached to a prosthetic foot 3, by means of screws 6 or bolts 6 (see Fig. 1a).

[0094] Connecting member

[0095] As stated above, the connecting member 40 is arranged in the housing 5 (shown in Figs. 7a-b, 8a-b and 10a). This arrangement is particularly advantageous, since it enables the shock absorption apparatus 1 to have a relatively small diameter, since the connecting member 40 is enclosed in housing 5.

[0096] Further, the connecting member 40 is arranged in the axial through-hole 33 of the bumper assembly 30 (as shown in Figs. 7a-b, 8a-b and 10a-b). This arrangement enables the shock absorption apparatus 1 to have a relatively small diameter, which provides for the possibility of attaching cosmetics to e.g. a prosthetic leg comprising the shock absorption apparatus 1 , the resulting prosthetic leg including the cosmetics having a diameter comparable to the diameter of a natural leg.

[0097] As stated above, the connecting member 40 has a length (L) and the bumper assembly 30 has a length (I). Preferably, the length (L) is equal or greater than the length (I) (see Figs. 2a-b, 7a-b, 8a-b and 11). In other words, the connecting member 40 preferably extends along axis (A) through the bumper assembly 30 from the first end 31 of the bumper assembly 30 to at least the second end 32 of the bumper assembly 30. In specific embodiments, the length (L) is greater than the length (I).

[0098] The connecting member 40 is configured to moveably connect the first part 10 and the second part 20. Thus, while connecting the first part 10 and the second part 20 such that these two parts cannot be separated, the connecting member 40 allows movement of the first part 10 and the second part 20 relative to each other as described above. This may be achieved in different ways as described below.

[0099] The connecting member 40 may be mounted to the first part 10 and / or to the second part 20. In other words, the connecting member 40 may be rigidlyW152230011

[0100] 12

[0101] connected or fixedly mounted to the first part 10 and / or to the second part 20. Alternatively, the connecting member 40 may be an integral part of the first part 10 or of the second part 20. In embodiments wherein the connecting member 40 is mounted to the first part 10 and / or to the second part 20, the connecting member 40 cannot move in an axial direction or rotate in relation to the part to which it is mounted. In embodiments wherein the connecting member 40 is an integral part of the first part 10 or of the second part 20, the connecting member 40 cannot move in an axial direction or rotate in relation to the part it is an integral part of.

[0102] Preferably, the connecting member 40 is mounted either to the first part 10 or to the second part 20; or the connecting member 40 is an integral part of the first part 10 or of the second part 20. In other words, the connecting member 40 may be rigidly connected or fixedly mounted to the first part 10 or to the second part 20; or may be an integral part of the first part 10 or of the second part 20. In such cases, the connecting member 40 cannot move in an axial direction or rotate in relation to the part to which it is mounted or to the part it is an integral part of. However, the connecting member 40 can move in an axial direction or rotate about the axis (A) in relation to the part to which it is not mounted or to the part it is not an integral part of.

[0103] The connecting member 40 may be deformable. This allows for an axial movement between the first part 10 and the second part 20 when the shock absorption apparatus 1 is subjected to a compressing axial force compressing the first part 10 towards the second part 20. Thus, in embodiments in which the connecting member 40 is mounted to the first part 10 and also mounted to the second part 20, the connecting member 40 deforms when the shock absorption apparatus 1 is subjected to a compressing axial force compressing the first part 10 towards the second part 20. Examples of such deformable connecting members 40 are springs or other resilient elements.

[0104] Thus, the connecting member 40 may be deformable, such that it allows or enables axial movement between the first part 10 and the second part 20 whenW152230011

[0105] 13

[0106] the shock absorption apparatus 1 is subjected to a compressing axial force compressing the first part 10 towards the second part 20.

[0107] Other examples of a connection member 40 include wires, chains and weaved strips or bands. In the non-loaded state of the shock absorption apparatus 1 , such a connection member 40 may be substantially straight (no tension) or even slightly stretched (with tension) connecting the first part 10 and the second part 20 and holding the two parts 10, 20 together to form the housing 5. When the shock absorption apparatus 1 is subjected to a compressing axial force compressing the first part 10 towards the second part 20, the connection member 40 loses its substantially straight shape and thus its length (L) along axis (A) is reduced, allowing axial movement between the first part 10 and the second part 20.

[0108] The connecting member 40 may be a connecting pin 40 as shown in Fig. 3. The connecting pin 40 has a first end portion 41 and a second end portion 42. A mid portion 43 is located between the first end portion 41 and the second end portion 42.

[0109] Typically, the connecting pin 40 may be made from titanium. Titanium provides strength and endurance, and a low weight.

[0110] The connecting pin 40 may be mounted to the first part 10 and / or to the second part 20. Alternatively, the connecting pin 40 may be an integral part of the first part 10 or of the second part 20.

[0111] The connecting pin 40 is preferably essentially rigid.

[0112] Preferably, the connecting pin 40 is mounted to the first part 10 or to the second part 20. In other words, the connecting pin 40 is preferably rigidly connected or fixedly mounted to the first part 10 or to the second part 20. In such cases the connecting pin 40 is moveably connected to the other part 10, 20, such that the connecting pin 40 can move axially and / or rotationally in relation to the other part 10, 20.

[0113] The connecting pin 40 may be connected to the first part 10 by first securing means 70 and connected to the second part 20 by second securing means 71 (shown in Figs. 7a-b, 8a-b, 10a-b and 11). In certain embodiments, the securingW152230011

[0114] 14

[0115] means 70, 71 are positioned perpendicular to the connecting pin 40. The securing means 70, 71 are configured to engage with the connecting pin 40 such as to secure the connecting pin to the first part 10 and to the second part 20. The securing means 70, 71 may fixedly mount the connecting pin 40 to one of the parts 10, 20. The securing means 70, 71 may connect the connecting pin 40 to one of the parts 10, 20 such that the connecting pin 40 cannot be disengaged from the part 10, 20, but is movable in relation to the part 10, 20.

[0116] Preferably, one of the first securing means 70 or the second securing means 71 allows rotation of one of the first part 10 or the second part 20 in relation to the connecting pin 40.

[0117] Preferably, the connecting pin 40 is connected to the first part 10 by first securing means 70 such that the first part 10 is rotationally movable in relation to the connecting pin 40.

[0118] Preferably, the connecting pin 40 is connected to the first part 10 by first securing means 70 such that the first part 10 is axially movable in relation to the connecting pin 40.

[0119] Thus, in certain embodiments (see Figs. 7a-b, 8a-b, 10a-b and 11), the connecting pin 40 is rigidly connected or fixedly mounted to the second part 20 by second securing means 71 and connected to the first part 10 by first securing means 70, such that the first part 10 can move axially and rotationally in relation to the connecting pin 40. Thus, the first part 10 can rotate relative to the second part 20. This is advantageous since, when the shock absorption apparatus 1 is mounted together with a prosthetic foot 3, such a configuration mimics the movement of a natural foot.

[0120] Preferably, the securing means 70, 71 are securing pins 70, 71 (as shown in Figs. 7a-b, 8a-b, 10a-b and 11). The first securing means 70 is preferably two securing pins 70. The second securing means 71 is preferably one securing pin 71.

[0121] In specific embodiments (see Fig. 3), one end portion 42 of the connecting pin 40 has a through-hole 45 for receiving a second securing pin 71.W152230011

[0122] 15

[0123] In specific embodiments (shown in Figs. 7a-b, 8a-b, 10a-b and 11), the connecting pin 40 is rigidly connected or fixedly mounted to the second part 20 by one second securing pin 71 and connected to the first part 10 by two first securing pins 70, such that the first part 10 can move axially and rotationally in relation to the connecting pin 40. The second securing pin 71 may be disposed in any angle relative to the first securing pins 70. The second securing pin 71 may thus be disposed perpendicular to the first securing pins 70 (as shown in Figs. 2a-b, 7a-b, 8a-b, 10a-b and 11). The second securing pin 71 may alternatively be disposed in parallel to the first securing pins 70.

[0124] The connecting pin 40 may have a first end portion 41 being slidably arranged in the first part 10 or in the second part 20; and a second end portion 42 being fixed to the other part of the first part 10 and the second part 20. Such a configuration allows the axial movement between the first part 10 and the second part 20.

[0125] A connecting pin 40 that can be slidably arranged is shown in Fig. 3 and described herein as having its first end 41 connected to the first part 10.

[0126] However, as understood by the skilled person, the first end 41 of the connecting pin 40 could alternatively be connected to the second part 20. In specific embodiments (shown in Figs. 7a-b, 8a-b, 10a-b and 11), the connecting pin 40 is slidably arranged in the first part 10 and mounted to the second part 20. Preferably, the connecting pin 40 is mounted to the second part 20 by one second securing pin 71 arranged in a hole 27 of the second part 20 and running through a through-hole 45 of the connecting pin 40 (see Figs. 2a-b, 7a-b, 8a-b, 10a and 11). To be able to be slidably arranged, the first end 41 of the connecting pin 40 may comprise a stop member 44 (shown in Fig. 3). The stop member 44 is configured to engage with the securing pins 70, the securing pins being arranged in holes 17 in the first part 10 (see Figs. 2a-b, 7a-b, 8a-b, 10a and 11), in order to limit axial movement of the first part 10 and the second part 20 in directions away from each other. In this embodiment, the stop member 44 of the first end 41 of the connecting pin 40 has a diameter D4a that is larger than the diameter D4b of the mid portion 43 of the connecting pin 40. Thus,W152230011

[0127] 16

[0128] connecting pin 40 is arranged to be axially movable in a sliding manner between the two first securing pins 70. The distance between the two first securing pins 70 is larger than the diameter D4b of the mid portion 43 of the connecting pin 40, such as to allow the connecting pin 40 to be slidable between the two securing pins 70, and smaller than the diameter D4a of the first end 41 of the connecting pin 40, such as to prevent the connecting member 40 from disconnecting from the first part 10. The stop member 44 can be configured as a head portion or as flange. In addition to the connecting pin 40 being slidable along the axis (A), this configuration allows the first part 10 to rotate in relation to the second part 20. Further, this configuration enables the shock absorption apparatus 1 to have a relatively small diameter, which provides for the possibility of attaching cosmetics to e.g. a prosthetic leg comprising the shock absorption apparatus 1, the resulting prosthetic leg including the cosmetics having a diameter comparable to the diameter of a natural leg.

[0129] Other configurations enabling the connecting pin 40 to be slidable along the axis (A) can be envisioned, such as the connecting pin 40 having an elongated hole along axis (A) adapted to receive a first securing pin 70.

[0130] First part and second part

[0131] When in use, such as during walking, the first part 10 will undulate, i.e. move up and down along axis (A), relative to the second part 20.

[0132] As shown in Fig. 4a, the first part 10 may comprise a first end 11 and an opposite second end 12, wherein the first end 11 is adapted to be attached to a first prosthetic element 2, and wherein the second end 12 has an axial aperture 13, the aperture 13 having an inner surface 14. A portion of the inner surface 14 is in abutment with the bumper assembly 30 (not shown in Fig. 4a). As shown in Fig. 5a, the second part 20 may comprise a first end 21 and an opposite second end 22, the second end 22 being adapted to be attached to a second prosthetic element 4, and wherein the first end 21 has an axial aperture 23 having an inner surface 24. A portion of the inner surface 24 is in abutment with the bumperW152230011

[0133] 17

[0134] assembly 30 (not shown in Fig. 5a). In such configurations, the first part 10 is prevented from moving rapidly towards the second part 20 when the shock absorption apparatus 1 is subjected to a compressing axial force. Instead, the movement between the first part 10 and the second part 20 is damped as soon as the shock absorption apparatus 1 is subjected to the force, such as at the beginning of a stride or just as the foot hits the ground during jumping.

[0135] Examples of such a portion of the inner surface 14 of the first part 10 that is in abutment with the bumper assembly 30 include portions of the inner surface 14 that are perpendicular to the axis (A) as well as portions that are essentially parallel to the axis (A). Examples of such a portion of the inner surface 24 of the second part 20 that is in abutment with the bumper assembly 30 include portions of the inner surface 24 that are perpendicular to the axis (A) as well as portions that are essentially parallel to the axis (A).

[0136] Typically, the second end 12 of the first part has a length along axis (A) of 25 to 45 mm, such as 30 to 40 mm, such as 35 to 40 mm, such as 36 mm.

[0137] Typically, the first end 21 of the second part 20 has a length along axis (A) of 25 to 50 mm, such as 30 to 45 mm, such as 35 to 40 mm, such as 35.5 mm. The second end 22 of the second part 20 may have a length along axis (A) of 30 to 50 mm, such as 35 to 45 mm, such as 40 to 45 mm, such as 41 mm.

[0138] The second end 12 of the first part 10 may have a substantially cylindrical configuration having an outer diameter D1a and an inner diameter D1b (see Fig. 4a); and the first end 21 of the second part 20 may have an outer diameter D2a that is smaller than the inner diameter D1 b of the second end 12 of the first part 10 (see Fig. 5a). In such embodiments, the second end 12 of the first part 10 envelopes at least a portion of the first end 21 of the second part 20 (as seen in Fig. 7a-b, 8a-b and 10a). Preferably, the second end 12 of the first part 10 essentially covers the first end 21 of the second part 20.

[0139] The inner diameter D1 a of the second end 12 of the first part 10 is typically from 30 to 75 mm, such as 35 to 70 mm, such as 40 to 65 mm, such as 45 to 60 mm, such as 50 to 55 mm, such as 35 to 40 mm, such as 35.9 mm. TheW152230011

[0140] 18

[0141] torsion resistance of the shock absorption apparatus 1 increases with the diameter.

[0142] The difference between the inner diameter D1a and the outer diameter D1b is typically about 6 mm. Thus, the outer diameter D1b is typically 36 to 81 mm, such as 40 to 75 mm, such as 45 to 70 mm, such as 50 to 65 mm, such as 55 to 60 mm, such as 40 to 45 mm, such as 42 mm.

[0143] The outer diameter D2a of the first end 21 of the second part 20 is typically from 20 to 50 mm, such as 25 to 45 mm, such as 30 to 40 mm, such as 35 mm, such as 25 to 30 mm, such as 25.8 mm.

[0144] The outer diameter D2b of the second end 22 of the second part 20 is typically 25 to 65 mm, such as 30 to 60 mm, such as 35 to 55 mm, such as 40 to 50 mm, such as 45 mm, such as 30 to 45 mm, such as 30 to 35 mm, such as 32 mm, such as 35 to 40 mm, such as 40 to 45 mm, such as 42 mm.

[0145] The first part 10 may comprise an axially extending locking portion 15 and the bumper assembly 30 may have a corresponding axially extending locking part 34, wherein the locking portion 15 and the locking part 34 are configured to be in engagement with each other for controlling rotational movement about the axis (A) between the first part 10 and the second part 20. When the shock absorption apparatus 1 is subjected to a rotational or tortional force, the axially extending locking portion 15 of the first part 10 will exert a force on the corresponding axially extending locking part 34 of the bumper assembly 30 and thereby the bumper assembly 30 is deformed and damps the rotational force. Thus, the shock absorption apparatus 1 according to the present disclosure will allow for a damped rotational movement between the first part 10 and the second part 20 similar to the rotation allowed in a natural foot. Typically, the rotation allowed is up to 20° in each direction, preferably 10° to 20° in each direction.

[0146] The axially extending locking portion 15 of the first part 10 may be an aperture configured to receive a corresponding axially extending locking part 34 protruding from the bumper assembly 30.W152230011

[0147] 19

[0148] Preferably, the axially extending locking portion 15 of the first part 10 is a first protrusion 15 protruding from the inner surface 14 of the aperture 13 of the first part 10 (as shown in Figs. 4b-d) and the corresponding axially extending locking part 34 of the bumper assembly 30 is a first recess 34 adapted to receive the at least one first protrusion 15 protruding from the inner surface 14 of the aperture 13 of the first part 10 (see Figs. 6d-f and 9a). Thus, in specific embodiments, in the first part 10, a portion of the inner surface 14 of the aperture 13 is formed as at least one first protrusion 15 extending towards the second part 20, and configured to be in engagement with at least one corresponding first recess 34 of the bumper assembly 30 for controlling relative rotational movement about the axis (A) between the first part 10 and the second part 20. When the shock absorption apparatus 1 comprising such a first part 10 is subjected to a rotational or tortional force, the first protrusions 15 of the first part 10 will exert a force on the bumper assembly 30 in the first recess 34 and thereby the bumper assembly 30 is deformed and damps the rotational force. Thus, the shock absorption apparatus 1 according to the present disclosure will allow for a damped rotational movement between the first part 10 and the second part 20 similar to the rotation allowed in a natural foot. Typically, the rotation allowed is up to 20° in each direction, preferably 10° to 20° in each direction.

[0149] Preferably, the first part 10 comprises two first protrusions 15 protruding from the inner surface 14 of the aperture 13 of the first part 10. Preferably, the two first protrusions 15 are positioned opposite one each other (see Figs. 4b-4d).

[0150] The second part 20 may have at least one inner recess 28 extending radially outwards for slidingly receiving the at least one first protrusion 15 from the inner surface 14 of the aperture 13 of the first part 10 (see Figs. 5d and 9a-b). Typically, the inner recess 28 of the second part 20 is configured to allow a movement of the at least one first protrusion 15 when the shock absorption apparatus 1 is subjected to a rotational or tortional force such that the first part 10 rotates in relation to the second part 20. The trajectory of the movement ofW152230011

[0151] 20

[0152] the at least one first protrusion 15 is substantially parallel to the circumference of the second part 20.

[0153] The second end 12 of the first part 10 may have an inner axial bore 16 for receiving the connecting member 40, wherein the axial bore 16 extends into the first end 11 of the first part 10 (see Figs. 4b-d, 7a-b, 8a-b and 10a). Additionally, or alternatively, the first end 21 of the second part 20 has an inner axial bore 26 for receiving the connecting member 40 (see Figs. 5b-c, 7a-b, 8a-b and 10a).

[0154] The second end 22 of the second part 20 may have a diameter D2b (see Fig. 5a) that is larger than the diameter D2a of the first part 21 of the second part 20. In an unloaded state, i.e. when the bumper assembly is not compressed or only slightly compressed, such as during standing, there is a gap G between a lower surface 12a of the second end 12 of the first part 10 and an upper surface 22a of the second end 22 of the second part 20 (see Figs. 7a-b). Typically, the gap G is 2-10 mm, such as 3-8 mm, such as 4-7 mm, such as 5-6 mm. Preferably, the gap G is about 5 mm. In a non-relaxed state, i.e. when a compressing axial force compressing the first part 10 towards the second part 20 is exerted on the shock absorption apparatus 1 , such as during stride or during landing after a jump, the first part 10 moves towards the second part 20 and the bumper assembly 30 is compressed, and the gap G is reduced (see Figs. 8a-b). In such cases, the gap G may even be essentially closed.

[0155] A specific example of the first part 10 is shown in Fig. 4b. In this example, the axially extending locking portion 15 of the first part 10 is a first protrusion 15 protruding from the inner surface 14 of the aperture 13 of the first part 10 (as shown in Fig. 4b). Thus, in the first part 10, a portion of the inner surface 14 of the aperture 13 is formed as two first protrusions 15 extending towards the opening of the aperture 13 and configured to be in engagement with two corresponding first recesses 34 of the bumper assembly 30 for controlling relative rotational movement about the axis (A) between the first part 10 and the second part 20. When the shock absorption apparatus 1 comprising such a first part 10 is subjected to a rotational or tortional force, the first protrusions 15 of the first part 10 will exert a force on the bumper assembly 30 in the first recessW152230011

[0156] 21

[0157] 34 and thereby the bumper assembly 30 is deformed and damps the rotational force. Such a shock absorption apparatus 1 will allow for a damped rotational movement between the first part 10 and the second part 20 similar to the rotation allowed in a natural foot. Typically, the rotation allowed is up to 20° in each direction, preferably 10° to 20° in each direction. In this specific example, the first part 10 also comprises an inner axial bore 16 configured to slidably receive a stop member 44 of a connecting pin 40. Fig. 4c is a view along axis (A) of the second end of the first part shown in Fig. 4b and Fig. 4d is a perspective view of the second end of the first part shown in Fig. 4b.

[0158] A specific example of the second part 20 is shown in Fig. 5b. In this example, the first end 21 of the second part 20 has an inner axial bore 26 for receiving and mounting the connecting member 40 and a hole 27 adapted to receive a securing pin 71 for mounting the connecting member to the second part. The second part 20 shown in Fig. 5c further comprises an evacuation channel 60 for air and / or water. In this example, the evacuation channel 60 connects the aperture of the first end 21 of the second part 20 to the outside surface of the second part 20. The evacuation channel 60 will allow for the evacuation of e.g. air and water from the interior of the shock absorption apparatus 1 to the exterior. Also, during hard impact, such as a hard stride or a jump, the evacuation channel 60 will provide a further damping by an air cushion formed in the evacuation channel 60.

[0159] Fig. 5d is a view along axis (A) of one example of the first end 21 of the second part 20 of the shock absorption apparatus 1. In this specific example, the aperture 23 of the second part has two inner recesses 28 extending radially outwards for slidingly receiving two first protrusions 15 from the inner surface 14 of the aperture 13 of the first part 10 (see Figs. 5d and 9a-b). The inner recesses 28 are configured to allow a movement of the two first protrusions 15 when the shock absorption apparatus 1 is subjected to a rotational or tortional force such that the first part 10 rotates in relation to the second part 20. The trajectory of the movement of the first protrusions 15 is substantially parallel to the circumference of the second part 20. Also shown in Fig. 5d are the upperW152230011

[0160] 22

[0161] surface 22a of the second end 22 of the second part 20 as well as the inner axial bore 26 for receiving and mounting the connecting member 40.

[0162] Bumper assembly

[0163] The bumper assembly may also be referred to as a damper assembly and a bumper may also be referred to as a damper.

[0164] The bumper assembly 30 is arranged between the first part 10 and the second part 20 and damps a relative movement between the first part 10 and second part 20. The bumper assembly 30 is arranged in the housing 5 formed by the first part 10 and the second part 20 and is enveloped by the housing 5. The bumper assembly 30 is shown in its simplest form in Fig. 6a. The bumper assembly 30 has a first end 31 and a second end 32 and comprises at least one resilient member. The bumper assembly 30 has an axial through-hole 33 along axis (A). Further examples of bumper assemblies according to the present disclosure are described below and shown in Figs. 6b-6f.

[0165] When the shock absorption apparatus 1 of the present disclosure is subjected to a compressing axial force compressing the first part 10 towards the second part 20, such as during a stride or during landing after a jump, the first part 10 and the second part 20 move towards each other along axis (A). The bumper assembly 30 damps the relative movement between the first part 10 and second part 20, such as to provide a smooth stride and to reduce or prevent translation of the axial force on the stump of the person wearing the prosthesis.

[0166] The bumper assembly 30 is essentially resilient. When the shock absorption apparatus 1 is subjected to a compressing axial force compressing the first part 10 towards the second part 20, the bumper assembly 30 is compressed and deformed, thereby damping the relative movement between the first part 10 and the second part 20. When the compressing axial force is lifted, the bumper assembly 30 returns to its initial state and shape and is ready to damp a second compressing axial force. Thus, when mounted together with a prosthetic foot,W152230011

[0167] 23

[0168] each stride is damped in a smooth and comfortable way, even when walking at a higher pace.

[0169] The resilient member may comprise an elastomer, such us polyurethane, rubber, silicone, gel (such as a copolymer gel) or a plastic. Preferably, the resilient member is polyurethane.

[0170] Preferably, the bumper assembly 30 is in abutment with a portion of an inner surface 14 of the second end 12 of the first part 10. Preferably, the bumper assembly 30 is also in abutment with a portion of an inner surface 24 of the first end 21 of the second part 20. This prevents the first part 10 from moving rapidly towards the second part 20 when the shock absorption apparatus 1 is subjected to an axial force. Instead, the movement between the first part 10 and the second part 20 is damped as soon as the force is subjected to the shock absorption apparatus 1 , such as at the beginning of a stride or just as the foot hits the ground during jumping.

[0171] The bumper assembly 30 may further be pre-compressed. Such a precompressed bumper assembly 30 exerts a biasing force slightly urging separation of the first part 10 and the second part 20. This will contribute to the natural feel of a foot and a smooth damping during use. In other words, the bumper assembly 30 is arranged such that it prevents rapid a movement of the first part 10 towards the second part 20.

[0172] The first end 31 and the second end 32 of the bumper assembly 30 may have different stiffness.

[0173] The first end 31 accounts for the majority of the damping of the rotational / torsional force.

[0174] Preferably, the first part 31 of the bumper assembly 30 primarily damps rotational force and the second part 32 of the bumper assembly 30 primarily damps compressing axial force.

[0175] Typically, the first end 31 of the bumper assembly 30 is more rigid than the second end 32 of the bumper assembly 30, which is softer.

[0176] Typically, the first end 31 of the bumper assembly 30 has a stiffness of 45 to 65 Shore D, such as 50 to 60 Shore D, or such as 55 Shore D. Typically, theW152230011

[0177] 24

[0178] second end 32 of the bumper assembly 30 has a stiffness of 80 to 100 Shore A, such as 85 to 95 Shore A, such as 85 to 90 Shore A, or such as 90 Shore A. The values given above are as measured according to ISO 10328:2016.

[0179] Different combinations of these stiffnesses are suitable for most persons weighing between 55 to 100 kg. The combination of different stiffnesses may be accustomed to a specific user depending on personal preferences. Thus, in certain cases, the first part 31 and the second part 32 of the bumper assembly 30 may have the same stiffness.

[0180] Preferably, the bumper assembly 30 comprises only one resilient member (as shown in Figs 6a, 6b, 6d, and 6e). The stiffness of the only one resilient member may vary along the axis (A), such that the first end 31 is stiffer (more rigid) than the second end 32.

[0181] Preferably, the only one resilient member is made of polyurethane, wherein the stiffness of the only one resilient member varies along the axis (A), such that the first end 31 is stiffer (more rigid) than the second end 32. In a preferred embodiment, the only one resilient member is made from two different polyurethanes having different stiffness that have been moulded or casted on top of each other.

[0182] However, in some embodiments, the bumper assembly 30 may comprise at least two resilient members (as shown in Figs. 6c and 6f). Preferably, the two resilient members have different stiffness. Suitable stiffnesses are as above.

[0183] Typically, at least the end portion of the second end 32 of the bumper assembly 30 is arranged in the aperture 23 of the second part 20. In certain embodiments, essentially the entire bumper assembly 30 is arranged in the aperture 23 of the second part 20.

[0184] In its simplest form, the bumper assembly 30 may be substantially cylindershaped (see Fig. 6a). However, other shapes may be envisioned, such as an elongated body having a rectangular cross-section, an elongated body having a diamond-shape cross-section, or a truncated cone.

[0185] In certain preferred embodiments, the bumper assembly 30 is tapered or chamfered in at least an end portion of the second end 32 (see Figs. 6b, 6e andW152230011

[0186] 25

[0187] 6f). This allows for the bumper assembly 30 to deform when subjected to an axial force and “swell” out into parts of the aperture 23 in first end 21 of the second part 20. Furthermore, the elastic properties of the bumper assembly 30 can be adjusted by adjusting the angle of the tapering, such that a pointier bumper assembly 30 will be softer than a more obtuse bumper assembly 30.

[0188] The bumper assembly 30 may have at least one first recess 34 adapted to receive at least one first protrusion 15 protruding from the inner surface 14 of the aperture 13 of the first part 10 (see Figs. 6d-f and Fig. 9a). When the shock absorption apparatus 1 is subjected to a rotational or tortional force, the first protrusions 15 of the first part 10 will exert a force on the bumper assembly 30 in the first recess 34 and thereby the bumper assembly 30 is deformed and damps the rotational force (see Fig. 9b). Thus, the shock absorption apparatus 1 according to the present disclosure will allow for a damped rotational movement between the first part 10 and the second part 20 similar to the rotation allowed in a natural foot. Typically, the rotation allowed is up to 20° in each direction, preferably 10° to 20° in each direction.

[0189] Preferably, the bumper assembly 30 has two first recesses 34 adapted to receive corresponding first protrusions 15 protruding from the inner surface 14 of the aperture 13 of the first part 10. Preferably, the two first recesses 34 are positioned opposite one each other (see Figs. 6d-f , and 9a-b).

[0190] The bumper assembly 30 may have at least one second recess 35 adapted to receive a second protrusion 25 extending radially inwards from the inner surface 24 of the aperture 23 of the second part 20.

[0191] In embodiments, wherein the first part 10 has a first protrusion 15 and the second part 20 has a second protrusion 25 and wherein the bumper assembly 30 comprises a first recess 34 and a second recess 35, a “wing” 36 is formed in the bumper assembly 30 between the first recess 34 and the second recess 35 (see Figs. 6d-f, and 9a-b). The “wing” 36 is deformed when the shock absorption apparatus 1 is subjected to a rotational force and the force is thereby damped (see Fig. 9b).W152230011

[0192] 26

[0193] Preferably, the bumper assembly 30 has two second recesses 35 adapted to receive a second protrusion 25 extending radially inwards from the inner surface 24 of the aperture 23 of the second part 20. Preferably, the two second recesses 35 are positioned opposite one each other (see Figs. 6d-f, and 9a-b).

[0194] Preferably, the bumper assembly 30 has two first recesses 34 as described above and two second recesses 35 as described above. Thus, in such embodiments, the bumper assembly has four wings 36.

[0195] Thus, as explained above, in specific embodiments, the bumper assembly 30 absorbs or damps shocks (essentially along axis (A)) as well as provides torsional or rotational resistance.

[0196] Specific examples of such bumper assemblies 30 are shown in Figs. 6d-f. The bumper assembly 30 is adapted to be arranged in a housing 5 formed from a first part 10 and a second part 20, as described above. The bumper assembly 30 has a first end 31 and a second end 32 and an axial through-hole 33. The first end 31 of the bumper assemblies 30 shown in Figs. 6d-f has two opposite first recesses 34 extending in a direction essentially parallel to the axial through-hole 33. The first recesses 34 are adapted to receive first protrusions 15 extending from the inner surface 14 of the first part 10. The first end 31 of the bumper assembly 30 has two opposite second recesses 35 extending in a direction essentially parallel to the axial through-hole 33. The second recesses 35 are adapted to receive second protrusions 25 extending radially inwards from the inner surface 24 of the second part 20. A “wing” 36 is formed between one first recess 34 and one second recess 35 in the bumper assembly 30.

[0197] When the shock absorption apparatus 1 is subjected to a rotational force, the “wing” 36 is deformed between a first protrusion 15 extending from the inner surface 14 of the first part 10 and a second protrusion 25 extending radially inwards from the inner surface 24 of the second part 20, and the force is thereby damped (see Fig. 9b).

[0198] Preferably, the second end 32 of the bumper assembly 30 is tapered or chamfered as explained above (shown in Figs. 6e and 6f). Preferably, the firstW152230011

[0199] 27

[0200] end 31 and the second end 32 of the bumper assembly 30 have different stiffness as explained above.

[0201] Preferably, the bumper assembly 30 is made of polyurethane. Preferably, the first end 31 and the second end 32 of the bumper assembly 30 have different stiffness as explained above.

[0202] The bumper assembly 30 may comprise two resilient members 30a, 30b. The resilient members 30a, 30b may have different stiffness as explained above.

[0203] Fig. 9a shows a bumper assembly 30 as shown in Figs. 6d-f arranged in the aperture 23 of the first end 21 of the second part 20. Fig. 9a illustrates the position and state of the bumper assembly 30 when the shock absorption apparatus 1 is not subjected to any rotational or torsional force (rotationally unloaded state). The bumper assembly 30 has four “wings” 36 formed between a first recess 34 and a second recess 35 as explained above. The first protrusions 15 protruding from the inner surface 14 of the aperture 13 of the first part 10 are received in first recesses 34 of the bumper assembly 30 and slidingly received in inner recesses 28 extending radially outwards from the inner surface 24 of the aperture 23 of the second part 20. The second protrusions 25 extending radially inwards from the inner surface 24 of the aperture 23 of the second part 20 are received in second recesses 35 of the bumper assembly 30.

[0204] Fig. 9b illustrates the position and state of the bumper assembly 30 when the shock absorption apparatus 1 is subjected to a rotational or torsional force (rotationally loaded state). The first part 10 rotates about axis (A) in relation to the second part 20 and in relation to the bumper assembly 30. Protrusions 15 thus move in the recess 28 of the first end 21 of the second part 20 and exert a force on the “wing” 36 of the bumper assembly 30. The “wing” 36 is deformed between a first protrusion 15 and a second protrusion 25 and thereby damps the force.W152230011

[0205] 28

[0206] Preferably, the first part 31 of the bumper assembly 30 primarily damps rotational force and the second part 32 of the bumper assembly 30 primarily damps compressing axial force.

[0207] Bushing

[0208] Relative movement between the first part 10 and the second part 20 may be enhanced by a bushing 50 (shown in Figs. 7a-b, 8a-b, 10a-b and 11). Thus, the shock absorption apparatus 1 according to the present disclosure may further comprise a bushing 50 disposed between the inner surface of the second end 12 of the first part 10 and outer surface of the first end 21 of the second part 20. In other words, a bushing 50 may be arranged between a portion of the inner surface of the second end 12 of the first part 10 and the outer surface of the first end 21 of the second part 20.

[0209] The bushing 50 may be attached to a portion of the inner surface of the second end 12 of the first part 10. The bushing 50 may be press-fitted to a portion of the inner surface of the second end 12 of the first part 10.

[0210] The bushing 50 may have a lower rim extending radially outwards configured to be disposed on an end surface 12a of the second end 12 of the first part 10.

[0211] Alternatively, the bushing 50 may be attached to the first end 21 of the second part 20. The bushing 50 may be press-fitted to a portion of the outside of the first end 21 of the second part 20. The bushing 50 may have an upper rim extending radially inwards that is disposed on an upper surface of the top portion 21 of the second part 20.

[0212] The bushing 50 may be made of any suitable material, such as metal, plastic, rubber or a composite material. The metal may e. g. be stainless steel, aluminium bronze or titanium.

[0213] Preferably, the bushing 50 is made of a plastic material.

[0214] Preferably, the bushing 50 is made of an elastomeric material, such as rubber or plastic. Such a material is advantageous since, in case sand grains or other debris come in contact with the bushing 50, these will be embedded in theW152230011

[0215] 29

[0216] elastomeric material of the bushing 50 such that they will not interfere with the relative movement between the first part 10 and the second part 20.

[0217] As understood by the skilled person, the outer diameter of the bushing 50 is dependent on the dimensions of the second end 12 of the first part 10 and of the first end 21 of the second part 20. Typical dimension of the bushing 50 (before being press-fitted as described above) may thus be as follows. The outer diameter of the bushing 50 may be 30 to 80 mm, such as 30 to 75 mm, such as 35 to 70 mm, such as 35 to 40 mm, such as 40 to 65 mm, such 45 to 60 mm, such as 50 to 55 mm, such as 36.2 mm. The inner diameter of the bushing 50 may be 25 to 55 mm, such as 30 to 50 mm, such as 35 to 45 mm, such as 40 mm, such as 30 to 35 mm, such as 32.5 mm. The wall thickness of the bushing 50 is typically about 2 mm. The length of the bushing 50 along an axis (A) is typically about 30 mm.

[0218] During normal use, the end surface 12a of the second end 12 of the first part 10 will not come into contact with the end surface 22a of the second end 22 of the second part 20, since the bumper assembly 30 effectively damps an applied compressing axial force. However, if the impact is hard and / or sudden, such as when landing after a high jump or after a misstep, it may happen. The hard impact and the noise of metal hitting metal can be prevented by a bushing 50 that is not completely covered by the second end 12 of the first part 10.

[0219] Thus, in certain embodiments (see Figs. 7a-b, 8a-b, 10a), the bushing 50 is not completely covered by the second end 12 of the first part 10. In other words, the bushing 50 protrudes slightly from the lower end of the second end 12 of the first part 10. In such cases, the bushing 50 will hit the end surface 22a of the second end 22 of the second part 20 before the lower surface of the second end 21 of the first part 10 hits the end surface 22a. In embodiments where the bushing 50 is made of plastic or rubber, there will be less sound than when the bushing 50 is of e.g. metal or when the lower surface of the second end 12 of the first part 10 hits the end surface 22a.W152230011

[0220] 30

[0221] Evacuation channel

[0222] The shock absorption apparatus 1 according to the present disclosure may comprise an evacuation channel 60 for air and / or water, wherein the evacuation channel 60 connects the inside of the housing 5 to the outside surface of the housing 5.

[0223] Specifically, the second part 20 may comprise an evacuation channel 60 for air and / or water, wherein the evacuation channel 60 connects the aperture of the first end 21 of the second part 20 to the outside surface of the housing 5.

[0224] The evacuation channel 60 will allow for the evacuation of e.g. air and water from the interior of the shock absorption apparatus 1 to the exterior.

[0225] Also, during hard impact, such as hard stride or a jump, the evacuation channel 60 will provide a further damping by an air cushion formed in the evacuation channel 60.

[0226] Specific embodiments

[0227] A specific embodiment of the shock absorption apparatus 1 is shown in Figures 7a-b, 8a-b and 10a-b. This embodiment comprises a first part 10 as described in relation to Figs. 4b-d and a second part as described in relation to Figs. 5b-c as well as a connecting pin 40 as described in relation to Fig. 3.

[0228] The shock absorption apparatus 1 according to this specific embodiment comprises a first part 10 adapted to be attached to a first prosthetic element 2 and a second part 20 adapted to be attached to a second prosthetic element 3. The first part 10 and the second part 20 are movable in relation to each other. Typically, the first part 10 and the second part 20 are axially movable in relation to each other. The shock absorption apparatus 1 further comprises a bumper assembly 30 for damping a relative movement between the first part 10 and the second part 20. The bumper assembly 30 typically damps a relative movement along axis (A) between the first part 10 and the second part 20. Additionally, the bumper assembly 30 may also damp a relative rotational movement between the first part 10 and the second part 20 around axis (A).W152230011

[0229] 31

[0230] When a compressing force is exerted on the shock absorption apparatus 1, such as during a step or stride or during landing, the first part 10 moves towards the second part 20. The relative axial movement between the first part 10 and the second part 20 is limited axially by the bumper assembly 30.

[0231] The bumper assembly 30 is arranged between the first part 10 and the second part 20. The first part 10 and the second part 20 together form a housing 5 configured to envelope the bumper assembly 30. The bumper assembly 30 is arranged in the housing 5. Thus, the bumper assembly 30 is not exposed to the environment but is protected within the housing 5. In this way, the bumper assembly 30 is protected from e.g. sunlight, dust and debris, such as e.g. sand. Further, water from a moist environment is also prevented or limited from coming into contact with the bumper assembly 30. The bumper assembly 30 has a first end 31 and a second end 32 and comprises at least one resilient member. The bumper assembly 30 has a through-hole 33 along axis (A) (shown in Figs. 2a-b). Specifically, the bumper assembly is arranged in an aperture 23 of the second part 20.

[0232] In a specific embodiment, the first end 31 and the second end 32 of the bumper assembly 30 have different stiffness as described above. The first end 31 is stiffer (more rigid) than the second end 32. Such a shock absorption apparatus 1 will give a more natural experience. Typical Shore values for the first end 31 and the second end 32 of the bumper 30 are given above.

[0233] Specifically, the resilient member is made of polyurethane, wherein the stiffness of the resilient member varies along the axis (A), such that the first end 31 is stiffer (more rigid) than the second end 32. In a specific embodiment, the only one resilient member is made from two different polyurethanes having different stiffness that have been moulded or casted on top of each other.

[0234] Preferably, the bumper assembly 30 may further be pre-compressed as described above.

[0235] The shock absorption apparatus 1 according to the present disclosure further comprises a connecting member 40, preferably a connecting pin 40. The connecting member 40 is arranged in the axial through-hole 33 of the bumperW152230011

[0236] 32

[0237] assembly 30 and extends along the axis (A). Thus, the connecting member 40 is arranged in the housing 5 formed by the first part 10 and the second part 20. The connection member 40 is configured to moveably connect the first part 10 and the second part 20.

[0238] Specifically, the connecting pin 40 has a first end portion 41 being slidably arranged in the first part 10 as described above in relation to Fig. 3; and a second end portion 42 being fixed to the second part 20. Such a configuration allows the axial movement between the first part 10 and the second part 20.

[0239] The connecting pin 40 is mounted to the second part 20 in an inner axial bore 26 configured for receiving the connecting pin 40. The connecting pin 40 is mounted to the second part 20 by one second securing pin 71 arranged in a hole 27 of the second part 20 and through a through-hole 45 of the connecting pin 40.

[0240] The connecting pin 40 is arranged in an inner axial bore 16 of the first part 10 configured for receiving the connecting pin 40. To be able to be slidably arranged, the first end 41 of the connecting pin 40 comprises a stop member 44 (as shown in Fig. 3). The stop member 44 is configured to engage with the securing pins 70, the securing pins 70 being arranged in holes 17 in the first part 10, in order to limit axial movement of the first part 10 and the second part 20 in directions away from each other. The securing means 70, 71 may be positioned perpendicular to the connecting pin 40. The stop member 44 of the first end 41 of the connecting pin 40 has a diameter D4a that is larger than the diameter D4b of the mid portion 43 of the connecting pin 40. Thus, the connecting pin 40 is arranged to be axially movable in a sliding manner between the two first securing pins 70. The distance between the two first securing pins 70 is larger than the diameter D4b of the mid portion 43 of the connecting pin 40, such as to allow the connecting pin 40 to be slidable between the two securing pins 70, and smaller than the diameter D4a of the first end 41 of the connecting pin 40, such as to prevent the connecting member 40 from disconnecting from the first part 10. In this example, the stop member 44 is configured as a head portion, but other configurations of the stop member 44W152230011

[0241] 33

[0242] are possible, such as e.g. a flange. In addition to the connecting pin 40 being slidable along the axis (A), this configuration allows the first part 10 to rotate in relation to the second part 20. Further, this configuration enables the shock absorption apparatus 1 to have a relatively small diameter, which provides for the possibility of attaching cosmetics to e.g. a prosthetic leg comprising the shock absorption apparatus 1, the resulting prosthetic leg including the cosmetics having a diameter comparable to the diameter of a natural leg.

[0243] In an unloaded state, i.e. when the bumper assembly is not compressed or only slightly compressed, such as during standing, there is a gap G between a lower surface 12a of the second end 12 of the first part 10 and an upper surface 22a of the second end 22 of the second part 20 (see Figs. 7a-b). Typically, the gap G is 2-10 mm, such as 3-8 mm, such as 4-7 mm, such as 5-6 mm.

[0244] Preferably, the gap G is about 5 mm. In a non-relaxed state, i.e. when a compressing axial force compressing the first part 10 towards the second part 20 is exerted on the shock absorption apparatus 1 , such as during a stride or during landing after a jump, the first part 10 moves towards the second part 20 and the bumper assembly 30 is compressed, and the gap G is reduced. In such cases, the gap G may even be essentially closed (see Figs. 8a-b). As can be seen when comparing Figs. 7a-b (unloaded) and Figs. 8a-b (loaded), the connecting pin 30 moves in relation to the first part 10 and slides between the two securing pins 70 and further into the inner axial bore 16 of the first part 10.

[0245] When the shock absorption apparatus 1 is subjected to a rotational or torsional force, the force is damped as described above in relation to Figs. 9a-b. Thus, in this specific embodiment, the first part 10 comprises two first protrusions 15 protruding from the inner surface 14 of the aperture 13 of the first part 10. Preferably, the two first protrusions 15 are positioned opposite one each other. The second part 20 has two inner recesses 28 extending radially outwards for slidingly receiving the first protrusions 15 from the inner surface 14 of the aperture 13 of the first part 10. The inner recesses 28 of the second part 20 are configured to allow a movement of the first protrusions 15 when the shock absorption apparatus 1 is subjected to a rotational or tortional force suchW152230011

[0246] 34

[0247] that the first part 10 rotates in relation to the second part 20. The trajectory of the movement of the first protrusions 15 is substantially parallel to the circumference of the second part 20. The bumper assembly 30 has four “wings” 36 formed between a first recess 34 and a second recess 35 as explained above. The first protrusions 15 protruding from the inner surface 14 of the aperture 13 of the first part 10 are received in the recesses 34 of the bumper assembly 30.

[0248] When the shock absorption apparatus 1 is subjected to a rotational or torsional force (rotationally loaded state), the first part 10 rotates about axis (A) in relation to the second part 20 and in relation to the bumper assembly 30. Protrusions 15 thus move in the recesses 28 of the first end 21 of the second part 20 and exert a force on the “wing” 36 of the bumper assembly 30. The “wing” 36 is deformed and damps the force.

[0249] Preferably, the first part 31 of the bumper assembly 30 primarily damps rotational force and the second part 32 of the bumper assembly 30 primarily damps compressing axial force.

[0250] Relative movement between the first part 10 and the second part 20 is enhanced by a bushing 50 disposed between the inner surface of the second end 12 of the first part 10 and the first end 21 of the second part 20. Preferably, the bushing 50 is attached to a portion of the inner surface of the second end 12 of the first part 10. The bushing 50 may be press-fitted to a portion of the inner surface of the second end 12 of the first part 10.

[0251] The bushing 50 may be made of any suitable material, as described above. Preferably, the bushing 50 is made of plastic. Such a material is advantageous since, in case sand grains or other debris come in contact with the bushing 50, these will be embedded in the elastomeric plastic material of the bushing 50 such that they will not interfere with the relative movement between the first part 10 and the second part 20.

[0252] During normal use, the end surface 12a of the second end 12 of the first part 10 will not come into contact with the end surface 22a of the second end 22 of second part 20, since the bumper assembly 30 effectively damps an appliedW152230011

[0253] 35

[0254] compressing axial force. However, if the impact is hard and / or sudden, such as when landing after a high jump or after a misstep, it may happen. The hard impact and the noise of metal hitting metal can be prevented by a bushing 50 that is not completely covered by the second end 12 of the first part 10.

[0255] Thus, in this specific embodiment, the bushing 50 is not completely covered by the second end 12 of the first part 10, but protrudes slightly from the lower end of the second end 12 of the first part 10. The bushing 50 will hit the end surface 22a of the second end 22 of the second part 20 before the lower surface of the second end 21 of the first part 10 hits the end surface 22a. Since the bushing 50 is made of plastic or rubber, there will be less sound than when the bushing 50 is of e.g. metal or when the lower surface of the second end 12 of the first part 10 hits the end surface 22a.

[0256] The shock absorption apparatus 1 preferably further comprises an evacuation channel 60 for air and / or water, wherein the evacuation channel 60 connects the inside of the housing 5 to the outside surface of the housing 5. In this specific example, the evacuation channel 60 connects the aperture 23 of the first end 21 of the second part 20 to the outside surface of the second part 20. The evacuation channel 60 will allow for the evacuation of e.g. air and water from the interior of the shock absorption apparatus 1 to the exterior. Also, during hard impact, such as during a hard stride or a jump, the evacuation channel 60 will provide a further damping by an air cushion formed in the evacuation channel 60.

[0257] Prosthetic foot assembly

[0258] The present disclosure also relates to a prosthetic foot assembly 80 comprising a shock absorption apparatus 1 according to the present disclosure. An exploded view of such a prosthetic foot assembly 80 is shown in Fig. 11.

[0259] * * *W152230011

[0260] 36

[0261] REFERENCE SIGNS

[0262] 1 shock absorption apparatus

[0263] 2 first prosthetic element

[0264] 3 second prosthetic element

[0265] 5 housing

[0266] 6 bolt / screw

[0267] 10 first part

[0268] 11 first end of first part

[0269] 12 second end of first part

[0270] 12a end surface of second end of first part

[0271] 13 aperture of second end of first part

[0272] 14 inner surface of aperture of second end of first part

[0273] 15 axially extending locking portion I first protrusion of inner surface of aperture of first part

[0274] 16 inner axial bore of aperture of first part

[0275] 17 hole for securing pin

[0276] 20 second part

[0277] 21 first end of second part

[0278] 22 second end of second part

[0279] 22a end surface of second end of second part

[0280] 23 aperture in first end of second part

[0281] 24 inner surface of aperture of first end of second part

[0282] 25 second protrusion extending radially in aperture of second part 26 inner axial bore of aperture of first end of second part

[0283] 27 hole for securing pin

[0284] 28 inner recess, adapted to receive protrusion 15 of first part

[0285] 30 bumper assembly

[0286] 30a first resilient memberW152230011

[0287] 37

[0288] 30b second resilient member

[0289] 31 first end of bumper assembly

[0290] 32 second end of bumper assembly

[0291] 33 axial through-hole

[0292] 34 axial locking part I first recess, adapted to receive first protrusion 15 35 second recess, adapted to receive second protrusion 25

[0293] 36 wing

[0294] 40 connecting member I connecting pin

[0295] 41 first end portion of connecting pin

[0296] 42 second end portion of connecting pin

[0297] 43 mid portion of connecting pin

[0298] 44 stop member of connecting pin

[0299] 45 through-hole of connecting pin

[0300] 50 bushing

[0301] 60 evacuation channel

[0302] 70 first securing means I first securing pin

[0303] 71 second securing means I second securing pin

[0304] 80 prosthetic foot assembly

[0305] D1 a outer diameter of the second end of the first part

[0306] D1 b inner diameter of the second end of the first part

[0307] D2a outer diameter of the first end of the second part

[0308] D2b outer diameter of the second end of the second part

[0309] D4a diameter of the stop member of the connecting pin

[0310] D4b diameter of the mid portion of the connecting pin

[0311] G gap

Claims

1. W15223001138CLAIMS1. A shock absorption apparatus (1) extending along an axis (A), the shock absorption apparatus (1) comprising:- a first part (10) adapted to be attached to a first prosthetic element (2), - a second part (20) adapted to be attached a second prosthetic element (3);wherein the first part (10) and the second part (20) are moveable relative to each other;- a bumper assembly (30) for damping a relative movement between the first part (10) and the second part (20), the bumper assembly (30) being arranged between the first part (10) and the second part (20); wherein the first part (10) and the second part (20) together form a housing (5) configured to envelope the bumper assembly (30), the bumper assembly (30) being arranged in the housing (5);wherein the bumper assembly (30) has a first end (31) and a second end (32), and comprises at least one resilient member; andwherein the bumper assembly (30) has an axial through-hole (33) along axis (A);wherein the shock absorption apparatus (1) further comprises- a connecting member (40) being arranged in the axial through-hole (33) of the bumper assembly 30) and extending along the axis (A), and the connecting member (40) being arranged in the housing (5) and configured to moveably connect the first part (10) and the second part (20).

2. The shock absorption apparatus (1) according to claim 1, wherein the connecting member (40) has a length (L) and the bumper assembly (30) has a length (I); wherein the length (L) is equal or greater than the length (I).W152230011393. The shock absorption apparatus (1) according to claim 1 or 2, wherein the connecting member (40) is mounted to the first part (10) and / or to the second part (20); or wherein the connecting member (40) is an integral part of the first part (10) or of the second part (20).

4. The shock absorption apparatus (1 ) according to any one of the preceding claims, wherein the connecting member (40) is deformable.

5. The shock absorption apparatus (1 ) according to any one of the preceding claims, wherein the connecting member (40) is a connecting pin (40).

6. The shock absorption apparatus (1) according to claim 5, wherein the connecting pin (40) has a first end portion (41) being slidably arranged in the first part (10) or in the second part (20); and a second end portion (42) being fixed to the other part of the first part (10) and the second part (20).

7. The shock absorption apparatus (1 ) according to any one of the preceding claims, wherein- the first part (10) comprises a first end (11 ) and an opposite second end (12), wherein the first end (11 ) is adapted to be attached to the first prosthetic element (2), and wherein the second end (12) has an axial aperture (13), the aperture (13) having an inner surface (14), wherein a portion of the inner surface (14) is in abutment with the bumper assembly (30);and wherein- the second part (20) comprises a first end (21 ) and an opposite second end (22), the second end (22) being adapted to be attached to the second prosthetic element (3), and wherein the first end (21) has an axial aperture (23) having an inner surface (24), wherein a portion of the inner surface (24) is in abutment with the bumper assembly (30).W152230011408. The shock absorption (1) apparatus according to claim 7, wherein the second end (12) of the first part (10) has a substantially cylindrical configuration having an outer diameter (D1 a) and an inner diameter (D1 b); and the first end (21 ) of the second part (20) has an outer diameter (D2a) that is smaller than the inner diameter (D1b) of the second end (12) of the first part (10).

9. The shock absorption apparatus (1) according to claim 7 or 8, wherein the first part (10) comprises an axially extending locking portion (15) and the bumper assembly (30) has a corresponding axially extending locking part (34), wherein the locking portion (15) and the locking part (34) are configured to be in engagement with each other for controlling rotational movement about the axis (A) between the first part (10) and the second part (20).

10. The shock absorption apparatus (1) according to claim 7 or 8, wherein, in the first part (10), a portion of the inner surface (14) of the aperture (13) is formed as at least one first protrusion (15) extending towards the second part (20), and configured to be in engagement with at least one corresponding recess (34) of the bumper assembly (30) for controlling relative rotational movement about the axis (A) between the first part (10) and the second part (20).

11. The shock absorption apparatus (1) according to any one of claims 7 to 10, wherein the second part (20) has at least one inner recess (28) extending radially outwards for slidingly receiving at least one first protrusion (15) protruding from the inner surface (14) of the aperture (13) of the first part (10).

12. The shock absorption apparatus (1) according to any one of the preceding claims, wherein the bumper assembly (30) is pre-compressed.W1522300114113. The shock absorption apparatus (1) according to any one of the preceding claims, wherein in at least an end portion of the second end (32) of the bumper assembly (30) is tapered.

14. The shock absorption apparatus (1) according to any one of the preceding claims, wherein the first end (31 ) and the second end (32) of the bumper assembly (30) have different stiffness.

15. The shock absorption apparatus (1) according to any one of the preceding claims, wherein the bumper assembly (30) comprises at least two resilient members having different stiffness.

16. The shock absorption apparatus (1) according to any one of claims 7 to 15, wherein at least an end portion of the second end (32) of the bumper assembly (30) is arranged in the aperture (23) of the second part (20).

17. The shock absorption apparatus (1) according to any one of claims 7 to 16, wherein the bumper assembly (30) has at least one first recess (34) adapted to receive at least one first protrusion (15) protruding from the inner surface (14) of the aperture (13) of the first part (10).

18. The shock absorption apparatus (1) according to any one of claims 7 to 17, wherein the bumper assembly (30) has at least one second recess (35) adapted to receive a second inner protrusion (25) extending radially inwards from the inner surface (24) of the aperture (23) of the second part (20).

19. The shock absorption apparatus (1) according to claim 18, wherein a wing (36) is formed in the bumper assembly (30) between the first recess (34) and the second recess (35), wherein the wing (36) is configured to be deformed when the shock absorption apparatus (1) is subjected to a rotational force andW15223001142thereby damp relative rotational movement about the axis (A) between the first part (10) and the second part (20).

20. The shock absorption apparatus (1) according to any one of claims 7 to 28, further comprising a bushing (50) disposed between the inner surface (14) of the second end (12) of the first part (10) and the first end (21 ) of the second part (20).

21. The shock absorption apparatus (1) according to any one of the preceding claims, wherein the second part (20) comprises an evacuation channel (60) for air and / or water, wherein the evacuation channel (60) connects the aperture (23) of the first end (21) of the second part (20) to the outside of the housing (5).

22. A prosthetic foot assembly (80) comprising a shock absorption apparatus (1 ) according to any one of claims 1 to 21.

Images