Stepless adjusting type hinge device applied to knee joint orthosis and knee-ankle-foot orthosis

Abstract

The invention relates to a stepless adjusting type hinge device applied to knee joint orthosis and a knee-ankle-foot orthosis. The device comprises a first connecting piece, a second connecting piece, a linkage piece and a limiting assembly. Wherein the first connecting piece is used for being connected with the thigh supporting strip, the second connecting piece is used for being connected with the shank supporting strip, and the second connecting piece is hinged to the first connecting piece. The linkage piece is arranged on the second connecting piece and rotates with the second connecting piece at the same frequency. The limiting assembly is arranged on the first connecting piece and comprises a baffle, the baffle is located on the rotating path of the linkage piece, the limiting piece assembly further comprises an adjusting piece, and the vertical height of the baffle is adjusted through the adjusting piece. Compared with the prior art, the device has the advantages that adaptive stepless adjustment of the bending angle of the second connecting piece can be achieved by controlling the adjusting piece to adjust the height of the baffle, and the device is high in adjusting stability and convenient to adjust.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical rehabilitation equipment, in particular to a stepless adjustment type hinge device applied to knee joint orthosis and a knee-ankle-foot orthosis. BACKGROUND

[0002] Hemiplegia caused by stroke is a key factor leading to motor dysfunction in patients, and impaired knee joint control ability can seriously affect walking function and significantly increase the risk of falling. Although the traditional knee-ankle-foot orthosis (KAFO) is widely used in stroke rehabilitation, its design has obvious limitations: it usually adopts a fixed angle or limited angle adjustment mode to lock the knee joint in the straight state. This rigid fixation forces patients to rely on abdominal muscles, back muscles and ilio-psoas muscles to perform "swing hip" and other compensatory movements to swing the lower limbs when walking, forming an abnormal gait.

[0003] Studies have shown that this design not only helps little to restore the muscle strength of key muscle groups in the lower limbs, but also contributes little to promoting neural plasticity and rebuilding normal walking function, and additionally increases the cardiopulmonary metabolic load of patients when walking. However, stroke rehabilitation itself has a phased demand - in the early rehabilitation stage, it is necessary to limit the knee joint activity to provide necessary stability support; while in the middle and late rehabilitation stage, it is necessary to gradually increase the range of joint activity to stimulate functional recovery. Unfortunately, the existing adjustable KAFO design generally has problems such as complex operation, insufficient adjustment accuracy, and poor comfort, which makes it difficult to meet the dynamic and phased rehabilitation needs, thereby seriously limiting its effective application in clinical practice. SUMMARY

[0004] In view of the above technical problems, the present application provides a stepless adjustment type hinge device applied to knee joint orthosis and a knee-ankle-foot orthosis, which can be adaptively adjusted without steps according to the actual needs of the user, has the advantages of high adjustment stability and easy adjustment.

[0005] To achieve the above purpose, the present application adopts the following technical solutions: A stepless adjustment type hinge device applied to knee joint orthosis, comprising: A first connecting piece for connecting a thigh support; A second connecting piece for connecting a calf support, the second connecting piece being hinged to the first connecting piece; A linkage member provided on the second connecting piece and rotating synchronously with the second connecting piece; and A limiting assembly is arranged on the first connecting member, the limiting assembly comprises a baffle, the baffle is in the rotating path of the linkage, the limiting assembly further comprises an adjusting member, the adjusting member adjusts the vertical height of the baffle.

[0006] In one of the embodiments, the limiting assembly further comprises a fixing member, the fixing member is arranged on the first connecting member; The baffle is in vertical sliding connection with the fixing member, and an adjusting column is threadedly connected to the baffle, the adjusting column is in rotational connection with the fixing member.

[0007] In one of the embodiments, a sliding groove is formed in the opposite inner wall of the fixing member, and a sliding block is integrally arranged on the two sides of the baffle, the sliding block is in sliding connection with the sliding groove.

[0008] In one of the embodiments, one end of the adjusting column protrudes from the fixing member for external adjusting operation, and an internal hexagonal hole is arranged at the end.

[0009] In one of the embodiments, the linkage comprises a rod body, the rod body is fixedly arranged on the second connecting member, and the rod body is perpendicular to the overall length of the second connecting member, the rod body is parallel to the baffle; When the baffle is at the lowest position, the rod body is in plane contact with the baffle.

[0010] In one of the embodiments, the linkage comprises an eccentric wheel, the eccentric wheel is hingedly connected with the second connecting member, and the rotating axis of the eccentric wheel is arranged in the same direction as the rotating axis of the second connecting member; One side of the second connecting member is the knee bending side, and the eccentric wheel is located on the side of the second connecting member close to the knee bending side; The second connecting member has a limiting portion, when the baffle is at the lowest position, the top of the eccentric wheel is in contact with the baffle, the bottom of the eccentric wheel is in contact with the limiting portion, and the baffle limits the rotation of the eccentric wheel.

[0011] In one of the embodiments, a torsional spring is arranged on the rotating shaft of the eccentric wheel, the elastic force of the torsional spring drives the eccentric wheel to tightly press on the limiting portion.

[0012] In one of the embodiments, the limiting portion and the bottom of the baffle are both provided with a buffer pad.

[0013] In one of the embodiments, the first connecting member has a first positioning portion, and the second connecting member has a second positioning portion. The first positioning part and the second positioning part are in contact when the first connecting part and the second connecting part are in a vertical state, so as to limit rotation of the second connecting part away from the knee joint.

[0014] The application also provides a knee-ankle-foot orthosis comprising the endless adjustment hinge device, the first connecting part is connected with a thigh support, and the second connecting part is connected with a lower leg support.

[0015] The application has the following advantages due to the above technical scheme. 1. The continuous and stepless adjustment of the bending angle of the knee joint is realized by adjusting the vertical height of the baffle, and the limitation of the traditional device is overcome. The height adjustment range of the baffle covers the complete rotation path of the linkage, and any bending angle can be accurately set according to the rehabilitation needs, which significantly improves the flexibility and adaptability of the adjustment. 2. The mechanical structure of the threaded adjusting column and the sliding groove sliding block is adopted, the rotating adjusting column can accurately control the lifting of the baffle, the operation is simple and the stability is high. The inner hexagonal hole is arranged at the end of the adjusting column, so that the adjusting column can be adjusted by a standard tool. 3. Two linkage schemes of a rod body or an eccentric wheel are provided, and synchronous rotation with the second connecting part can be realized. The eccentric wheel scheme adds a torsional spring pre-tightening force to ensure that it always fits the limiting part and avoids shaking and abnormal sound; in combination with a buffer pad, the collision noise is further reduced and the components are protected. 4. The baffle is completely limited when the knee joint is bent at the lowest position, which meets the braking needs in the early stage of rehabilitation; when it is adjusted to the highest position, free movement is realized, which is suitable for training in the later stage of rehabilitation; any angle in the middle can be locked, supporting progressive rehabilitation adjustment. 5. The first and second positioning parts are arranged to prevent the knee joint from being reversely over-extended, and a protective shell is arranged on the front and back surfaces of the hinge to improve the overall safety. 6. The angle setting can be quickly completed through the exposed adjusting column without the need for tool disassembly during the adjustment process. The adjustment logic of "pre-bending + baffle positioning" in the eccentric wheel scheme is intuitive and easy to operate, which significantly reduces the use threshold. 7. As a core module, the endless adjustment hinge device can be integrated into a knee-ankle-foot orthosis to provide a standardized and customizable hinge solution for lower limb rehabilitation. The modular design facilitates maintenance and has high clinical promotion value. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a specific structure diagram of the endless adjustment hinge device in an embodiment of the application; Figure 2 It is a specific structure diagram of the eccentric wheel in an embodiment of the application; Figure 3 It is an external structure diagram of the endless adjustment hinge device in an embodiment of the application; Figure 4 Fig. 1 is a schematic view of a specific structure of a protective shell in an embodiment of the present application; Figure 5 Fig. 2 is a schematic view of a principle structure of a knee-ankle-foot orthosis in an embodiment of the present application; Reference signs: 1, first connecting member; 2, second connecting member; 3, linkage member; 4, baffle; 5, adjusting member; 6, fixing member; 7, inner hexagonal hole; 8, limiting part; 9, first positioning part; 10, second positioning part; 11, protective shell; 12, thigh support; 13, lower leg support. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application are described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0018] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the common meaning understood by those skilled in the art to which the present application pertains. The terms "first", "second", "third", "fourth" and similar terms used in the present application do not denote any order, quantity or importance, but are used to distinguish different components. The terms "comprise", "include" and similar terms mean that the components or objects before the terms encompass the components or objects listed after the terms and their equivalents, and do not exclude other components or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect.

[0019] Although the traditional knee-ankle-foot orthosis (KAFO) is widely used in stroke rehabilitation, its design has obvious limitations: it usually adopts fixed angle or limited angle adjustment mode to lock the knee joint in the straight state. This rigid fixation forces patients to rely on abdominal muscles, back muscles and ilio-psoas muscles to perform "swing hip" and other compensatory actions to swing the lower limbs during walking, forming an abnormal gait. However, stroke rehabilitation itself has a phased demand - in the early rehabilitation stage, it is necessary to limit the knee joint activity to provide necessary stability support; while in the middle and late rehabilitation stage, it is necessary to gradually increase the range of joint activity to stimulate functional recovery. Unfortunately, the existing adjustable KAFO design generally has problems such as complex operation, insufficient adjustment accuracy and poor comfort, which makes it difficult to meet the phased rehabilitation needs of dynamic changes, thereby seriously limiting its effective application in clinical practice. In view of the above technical problems, the present application provides a kind of endless adjustment type hinge device applied to knee joint orthosis and knee-ankle-foot orthosis, and the user can adaptively adjust the bending angle of the device according to the actual needs, which has the advantages of high adjustment stability and easy adjustment. The technical scheme of the present application will be described in detail below with specific examples.

[0020] Referring to Figure 1 and Figure 2 , the present application relates to a kind of endless adjustment type hinge device applied to knee joint orthosis, including first connecting piece 1, second connecting piece 2, linkage 3 and limiting assembly. Wherein, first connecting piece 1 is used to connect thigh support 12, second connecting piece 2 is used to connect shank support 13, second connecting piece 2 is hinged with first connecting piece 1.

[0021] Linkage 3 is arranged on second connecting piece 2, and rotates with second connecting piece 2. Limiting assembly is arranged on first connecting piece 1, and limiting assembly includes baffle 4, baffle 4 is in the rotation path of linkage 3, limiting piece assembly also includes adjusting piece 5, adjusting piece 5 adjusts the vertical height of baffle 4.

[0022] It should be noted that in this embodiment, the height of baffle 4 is mainly adjusted to realize the endless adjustment of the bending angle of the device. Because linkage 3 rotates with second connecting piece 2, when second connecting piece 2 rotates, linkage 3 will rotate synchronously. Because baffle 4 is in the rotation path of linkage 3, when linkage 3 rotates to contact baffle 4, baffle 4 will limit the continuous rotation of linkage 3, thereby positioning and limiting second connecting piece 2. When linkage 3 rotates with second connecting piece 2, it has a complete and non-overlapping rotation path, and the height adjustment stroke of baffle 4 includes the entire rotation path. By adjusting the height of baffle 4, the endless adjustment of linkage 3 and even second connecting piece 2 is realized.

[0023] Compared with the prior art, the device can realize adaptive stepless adjustment of the bending angle of the second connecting piece 2 by adjusting the height of the baffle 4 through the adjusting piece 5, and has the advantages of high adjustment stability and convenience.

[0024] In an embodiment, the overall structure of the limiting assembly is further refined, and the limiting assembly further comprises a fixing piece 6 arranged on the first connecting piece 1. The baffle 4 is vertically slidably connected with the fixing piece 6, and the baffle 4 is threadedly connected with an adjusting column. The adjusting piece 5 is specifically the adjusting column, and the adjusting column is rotatably connected with the fixing piece 6.

[0025] Specifically, when the height position of the baffle 4 needs to be adjusted, the adjusting column needs to be rotated. The rotation of the adjusting column is converted into the vertical movement of the baffle 4 through the threaded connection, so as to realize the adjustment of the height of the baffle 4.

[0026] In this embodiment, specifically, the opposite inner walls of the fixing piece 6 are each provided with a sliding groove, and the baffle 4 is integrally provided with a sliding block on both sides, which is slidably connected with the sliding groove.

[0027] In this embodiment, more preferably, in order to facilitate the rotation of the adjusting column by the operator, one end of the adjusting column protrudes from the fixing piece 6 for external adjustment operation, and an internal hexagonal hole 7 is arranged at the end.

[0028] Specifically, in the subsequent operation process, the adjusting column can be selectively adjusted by means of a hexagonal wrench.

[0029] In an embodiment, the overall structure of the linkage 3 is further refined. The linkage 3 comprises a rod body fixedly arranged on the second connecting piece 2, and the rod body is perpendicular to the overall length of the second connecting piece 2 and parallel to the baffle 4. Specifically, when the baffle 4 is at the lowest position, the rod body is in plane abutment with the baffle 4. It should be noted that in this embodiment, when the baffle 4 is at the lowest position, the second connecting piece 2 and the first connecting piece 1 are in a vertical state, so the wearer's thighs and calves are in a straight state. At this time, the baffle 4 is in contact with the rod body, and the baffle 4 limits the bending of the second connecting piece 2 through the rod body, thereby limiting the bending of the wearer's calf. The wearer cannot bend, and the knee joint cannot bend at this time. The current state of the device meets the needs of early rehabilitation or specific patients. When the baffle 4 is adjusted to the highest position, the hinge body is in a completely free state. At this time, the rotation of the second connecting piece 2 is not limited, and the knee can be freely bent, which meets the needs of late rehabilitation or specific patients. When it is necessary to adjust the bending limitation of the second connecting member 2 by the baffle 4 according to actual needs, the calf can be actively bent first, and the calf part is bent to the required position, and then the height of the baffle 4 is adjusted, so that the baffle 4 is in contact with the linkage member 3 to limit the further bending of the linkage member 3, at this time, the maximum bending angle of the second connecting member 2 is adjusted to the required position. During the adjustment process, the positioning limitation of the linkage rod is realized by the vertical movement of the baffle 4, so that the infinite adjustment is realized. Compared with the stage and hierarchical adjustment mode in the prior art, the device has the advantages of higher adjustment stability and higher flexibility.

[0030] In another embodiment, the overall structure of the linkage member 3 is further refined, the linkage member 3 includes an eccentric wheel, the eccentric wheel is hinged with the second connecting member 2, and the rotation axis of the eccentric wheel is arranged in the same direction as the rotation axis of the second connecting member 2. One side of the second connecting member 2 is the knee bending side, and the eccentric wheel is located on the side of the second connecting member 2 close to the knee bending side. The second connecting member 2 has a limiting portion 8, when the baffle 4 is at the lowest position, the top of the eccentric wheel is in contact with the baffle 4, and the bottom of the eccentric wheel is in contact with the limiting portion 8, and the baffle 4 limits the rotation of the eccentric wheel; Referring to Figure 2 Specifically, the rotation connection position of the eccentric wheel is located at the upper left of the eccentric wheel, and in this figure, the knee bending side is the right side; Specifically, in this embodiment, when the baffle 4 is at the lowest position, the second connecting member 2 and the first connecting member 1 are in a vertical state as a whole, so the thigh and the calf of the wearer are in a straight state, at this time, the bottom of the eccentric wheel is in contact with the limiting portion 8, and the top of the eccentric wheel is in contact with the baffle 4, so the two rotation directions of the eccentric wheel are limited to move, the baffle 4 limits the bending of the second connecting member 2 through the eccentric wheel, thereby limiting the bending of the calf of the wearer, the wearer cannot bend, at this time, the knee cannot be bent, and the current state of the device meets the needs of the early rehabilitation or specific patients; When the baffle 4 is adjusted to the highest position, the hinge body is in a completely free state, at this time, the rotation of the second connecting member 2 is not limited, and the knee can be freely bent, which meets the needs of the final rehabilitation or specific patients. Specifically, when the second connecting member 2 is bent to the maximum stroke along with the calf, the top of the eccentric wheel can be designed to be in contact with the baffle 4 or not in contact with the baffle 4, and in this embodiment, when the eccentric wheel is rotated to the maximum stroke along with the second connecting member 2, the top of the eccentric wheel is in contact with the baffle 4; If it is necessary to adjust the bending limitation of the second connecting piece 2 by the baffle 4, the calf can be actively bent first, and then the height of the baffle 4 is adjusted to make the baffle 4 contact with the eccentric wheel to limit the further bending of the eccentric wheel, at this time, the maximum bending angle of the second connecting piece 2 is adjusted to the required position, and during the adjustment process, the positioning limitation of the eccentric wheel is realized by the vertical movement of the baffle 4, thereby realizing the stepless adjustment.

[0031] In this embodiment, specifically, in order to optimize the activity stability of the eccentric wheel, a torsional spring is arranged on the rotating shaft of the eccentric wheel, and the elastic force of the torsional spring drives the eccentric wheel to press against the limiting portion 8.

[0032] It should be noted that the arrangement of the torsional spring makes the bottom of the eccentric wheel always contact with the limiting portion 8, avoids the irregular shaking of the eccentric wheel caused by the rotation of the second connecting piece 2, and thus improves the use stability of the device, in addition, the positioning effect of the torsional spring can also avoid the abnormal sound caused by the shaking of the eccentric wheel.

[0033] In this embodiment, more preferably, in order to protect the three components of the limiting portion 8, the baffle 4 and the eccentric wheel, the bottom of the limiting portion 8 and the baffle 4 is provided with a buffer pad.

[0034] It should be noted that the buffer realized by the buffer pad not only can protect the components, but also can further avoid the abnormal sound caused by the contact and collision of the components.

[0035] In this embodiment, more preferably, the first connecting piece 1 has a first positioning portion 9, and the second connecting piece 2 has a second positioning portion 10. When the first connecting piece 1 and the second connecting piece 2 are in a vertical state, the first positioning portion 9 contacts with the second positioning portion 10 to limit the rotation of the second connecting piece 2 away from the knee joint.

[0036] The arrangement of the first positioning portion 9 and the second positioning portion 10 can avoid the accidental reverse bending of the knee joint of the wearer, and has a protection effect.

[0037] Referring to FIGS. 1 to 3, Figure 3 and Figure 4 In an embodiment, more preferably, the front surface and the back surface of the hinge portion between the first connecting piece 1 and the second connecting piece 2 are provided with a protective shell 11.

[0038] Referring to FIGS. 1 to 3, Figure 5 The application also provides a knee-ankle-foot orthosis, which comprises the stepless adjustment type hinge device mentioned in the above scheme, wherein the first connecting piece 1 is connected with a thigh support 12, and the second connecting piece 2 is connected with a calf support 13.

[0039] For example, when wearing a knee-ankle-foot orthosis for rehabilitation training, the wearer can use the adjustment column to adaptively adjust the bending angle of the second connecting member 2 according to their own situation; When the baffle 4 is at the lowest point, the second connecting member 2 and the first connecting member 1 are vertical as a whole, so the wearer's thigh and calf are in a straight state. At this time, the bottom of the eccentric wheel contacts the limit portion 8, and the top of the eccentric wheel contacts the baffle 4. Therefore, the eccentric wheel is restricted in both rotation directions. The baffle 4 restricts the bending of the second connecting member 2 through the eccentric wheel, thereby restricting the bending of the wearer's calf. The wearer cannot bend, and the knee joint cannot bend at this time. The current state of the device meets the needs of the early stage of rehabilitation or specific patients. When the baffle 4 is adjusted to its highest position, the hinge body is completely free. The rotation of the second connector 2 is unrestricted, allowing the knee to bend freely, meeting the needs of terminal rehabilitation or specific patients. Specifically, when the second connector 2 bends to its maximum travel with the calf, the top of the eccentric wheel can be designed to contact the baffle 4, or not. In this embodiment, the top of the eccentric wheel contacts the baffle 4 when the second connector 2 rotates to its maximum travel. When it is necessary to adjust the bending restriction of the baffle 4 on the second connecting member 2 according to actual needs, the calf can be actively bent first to bend the calf part to the desired position, and then the height of the baffle 4 is adjusted to make the baffle 4 contact with the eccentric wheel to limit further bending of the eccentric wheel. At this time, the maximum bending angle of the second connecting member 2 is adjusted to the desired position. During the adjustment process, the vertical movement of the baffle 4 realizes the positioning restriction of the eccentric wheel, thereby realizing stepless adjustment.

[0040] Compared with the prior art, the present device can adjust the height of the baffle 4 by manipulating the adjusting member 5, thereby realizing adaptive stepless adjustment of the bending angle of the second connecting member 2, and has the advantages of high adjustment stability and ease of adjustment.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A stepless adjustable hinge device for knee joint orthoses, characterized in that: include: A first connecting member, used for connecting the thigh support bar; a second connecting member, the second connecting member being used to connect the calf support bar, the second connecting member being hinged to the first connecting member; a linkage member, the linkage member being disposed on the second connecting member and rotating at the same frequency as the second connecting member; and A limit assembly is provided on the first connecting member, the limit assembly includes a baffle, the baffle is located on the rotation path of the linkage member, and the limit member assembly also includes an adjusting member, the adjusting member adjusts the vertical height of the baffle.

2. The stepless adjustable hinge device according to claim 1, characterized in that: The limiting assembly further includes a fixing member, and the fixing member is arranged on the first connecting member; The baffle is vertically slidably connected to the fixing member, and an adjusting column is threadedly connected to the baffle, and the adjusting column is rotatably connected to the fixing member.

3. The stepless adjustable hinge device according to claim 2, characterized in that: Slide grooves are provided on the opposite inner walls of the fixing member, and sliders are integrally provided on both sides of the baffle, and the sliders are sunk into the slide grooves for sliding connection.

4. The stepless adjustable hinge device according to claim 2, characterized in that: One end of the adjusting column protrudes from the fixing piece for external adjustment operation, and a hexagonal hole is provided at the end.

5. The stepless adjustable hinge device according to any one of claims 1 to 4, characterized in that: The linkage member includes a rod body, the rod body is fixedly arranged on the second connecting member, and the rod body is perpendicular to the entire length of the second connecting member, and the rod body is parallel to the baffle; When the baffle is at the lowest position, the rod body and the baffle are in planar contact.

6. The stepless adjustable hinge device according to any one of claims 1 to 4, characterized in that: The linkage member includes an eccentric wheel, the eccentric wheel is hinged to the second connecting member, and the rotation axis of the eccentric wheel and the rotation axis of the second connecting member are arranged in the same direction; One side of the second connecting member is the bending side of the knee joint, and the eccentric wheel is located on a side of the second connecting member close to the bending side of the knee joint; The second connecting member has a limiting portion. When the baffle is at the lowest position, the top of the eccentric wheel contacts the baffle, and the bottom of the eccentric wheel contacts the limiting portion. The baffle limits the rotation of the eccentric wheel.

7. The stepless adjustable hinge device according to claim 6, characterized in that: A torsion spring is provided on the rotating shaft of the eccentric wheel, and the elastic force of the torsion spring drives the eccentric wheel to be pressed tightly against the limiting portion.

8. The stepless adjustable hinge device according to claim 6, characterized in that: The limiting portion and the bottom of the baffle are both provided with buffer pads.

9. The stepless adjustable hinge device according to claim 1, characterized in that: The first connecting member has a first positioning portion, and the second connecting member has a second positioning portion; When the first connecting member and the second connecting member are in a vertical state, the first positioning portion contacts the second positioning portion to limit the second connecting member from rotating away from the knee joint.

10. A knee-ankle-foot orthosis, characterized in that: The steplessly adjustable hinge device comprises the one described in any one of claims 1 to 9, wherein the first connecting member is connected to the thigh support bar, and the second connecting member is connected to the calf support bar.

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