Ankle joint pushing mechanism by stabilization of ankle position using a brace structure

Toda, Hideki; Matsumoto, Takeshi; Tanizaki, Ryota; Imaeda, Takehiro

doi:10.1299/jamdsm.2016jamdsm0013

Cited by 15 publications

(3 citation statements)

References 10 publications

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“…An automated foot-stretching device had been studied for use in the bed-side; it is suggested that robot-assisted passive stretching and active movement training effectively improve motor function and mobility for post-stroke patients and children with acute brain injury 8 , 9 , 10 , 11 , 12 , 13 ) . Toda et al created a foot-stretching machine that simulates a therapist pulling the heel and dorsiflexing the foot in a sitting position 14 , 15 ) . Their machine had one degree of freedom of motion for dorsi- and plantar flexion.…”

Section: Introductionmentioning

confidence: 99%

Machine-assisted foot stretching in the elderly: a comparison with self-stretching

et al. 2021

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Self-stretching is the traditional at-home stretching method of choice. We developed an automatic foot-stretching machine to perform effective dorsiflexion stretching safely and easily at home. The effects of automatic stretching using our machine and self-stretching were investigated and compared. [Participants and Methods] Twelve healthy elderly people participated in the study. Automatic dorsiflexion static stretching was performed with the right foot, and self-stretching using a towel was performed with the left foot. Before and after each stretching, passive range of motion in dorsiflexion, maximal voluntary contraction strength in plantarflexion, passive resistive torque during passive dorsiflexion, and displacement of the muscle-tendon junction of the medial gastrocnemius muscle were measured. [Results] The range of motion in dorsiflexion had a significantly greater increase after automatic stretching than after self-stretching. The maximum strength in plantarflexion tended to decrease after automatic stretching but did not decrease after self-stretching. The passive resistive torque in both types of stretches decreased in some of the participants but increased in others. The displacement of the muscletendon junction of the medial gastrocnemius tended to shorten during automatic stretching as compared with selfstretching. [Conclusion] Foot stretching using a machine is as effective as self-stretching and tends to affect the tendon rather than the muscle.

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Section: Introductionmentioning

confidence: 99%

Machine-assisted foot stretching in the elderly: a comparison with self-stretching

et al. 2021

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“…Yuma SHIRAISHI*, Shogo OKAMOTO*, Naomi YAMADA* , **, Koki INOUE*, Yasuhiro AKIYAMA* and Yoji YAMADA* Thus far, a few ankle stretching machines have been developed for treating or preventing ankle plantarflexion contractures. Machines for ankle dorsiflexion were developed using electromagnetic or linear motors (Waldman et al, 2013;Ren et al, 2017;Toda et al, 2016Toda et al, , 2019Zhou et al, 2016). Yamada et al developed a machine for 3D foot motion for dorsiflexion, abduction, and eversion using McKibben-type pneumatic actuators and wire-driven mechanisms Kimura et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effective position of the rotation axis of an ankle stretching machine and the effect of misalignment

Shiraishi

Okamoto

Yamada

et al. 2020

JBSE

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The mechanical rotation axes of joint exercisers are believed to operate better when they match the biomechanical axes of human joints. However, there are few studies regarding ankle stretching machines. Further, the maleffects of rotation axis misalignments are not well known. Hence, we investigate the effective positions of rotation axes for ankle stretching machines and the effects of misalignments using a pneumatic-driven stretching machine developed in our previous study (Shiraishi et al., 2020). Eight healthy young males (ages 23.3 ± 1.4 years) participated in stretching exercises while the relative positions of the rotation axes between the machine and ankle were changed via plates installed under the heel. The stretching machine dorsiflexed the feet of the participants, and the dorsiflexion angles and three-axial forces applied to the forefeet were recorded. The measured values at the maximum dorsiflexion angle were evaluated by two-way analysis of variance and/or regression analysis. We determined that the rotation axis of the machine must be placed 7 mm above the lateral ankle because the normal force applied to the forefoot and maximum dorsiflexion angle were large, whereas the friction force was moderate. Further, the relationships among the dorsiflexion angle and contact forces were investigated via covariance selection. The three-axial forces significantly decreased as the axis of the machine was lowered below the ankle. Additionally, the force normal to the sole had large positive effects on the dorsiflexion angle and friction force of the sole, which could damage the skin. The misalignment of the rotation axis increased the contact force at the sole when the axis of the machine was above the ankle or decreased the efficiency of force transmission from the stretching machine to the user's foot when the machine's axis was below the ankle.

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“…To realize the mechanization, though it is necessary to guarantee the subject safety, there is a possibility that the device malfunctions due to a human error such as a mistake in an operation of the patient or a system error due to a failure of the machine controller devices [6]. Since these errors occur accidentally, the patient's risk avoidance behavior was delayed, and the patient was injured ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Proposing the Safety Mechanism of Ankle Joint Pushing Machine to Prevent the Over Stretching

Yamaguchi¹,

Toda²

2017

dtetr

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Abstract. In this paper, an ankle joint pushing system concerning about the safety mechanism of preventing the over stretching was proposed, and the effect of the safety mechanism was examined in the system. The bending of the ankle joint is an important medical treatment that physical therapist (PT's) utilize to help their patients recover their ability to walk and to prevent contracture. Since the ankle treatment requires a large amount of force (nearly equal to the subject's weight) plus precise angle and power control, manual treatment by PTs has not been replaced by mechanical treatment systems. In order to realize the safety mechanism of the ankle joint pushing treatment, the developed system uses two features. (1) The proposed device can control the starting angle of the ankle joint pushing treatment by manual setting. (2) The proposed device can realize the over stretching prevention by proposing mechanical fuse using nylon wire. Above two mechanisms can realize to get shorter the total time of the treatment, and it can release the pushing force to the toe when the setting force is exceeded. The total time of the treatment was shortened to 56% compared with previously proposed our developed automatic ankle joint pushing system, and the developed overload prevention mechanism working force was measured as 4 . 4 5 . 36 ± N when 58 N nylon wire used. The proposed two set of the safety mechanisms will effectively work to develop ankle joint treatment system.

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Ankle joint pushing mechanism by stabilization of ankle position using a brace structure

Cited by 15 publications

References 10 publications

Machine-assisted foot stretching in the elderly: a comparison with self-stretching

Machine-assisted foot stretching in the elderly: a comparison with self-stretching

Effective position of the rotation axis of an ankle stretching machine and the effect of misalignment

Proposing the Safety Mechanism of Ankle Joint Pushing Machine to Prevent the Over Stretching

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