An automatic and portable prosthetic cooling device with high cooling capacity based on phase change

Han, Yu; Fan, Liang; Zhao, Liang; Zhe, Jiang

doi:10.1016/j.applthermaleng.2016.05.074

Cited by 11 publications

(12 citation statements)

References 17 publications

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“…This makes it difficult to obtain a temperature absolute value which has to be maintained at the skin level of prosthetic users. However, average values of skin temperature are around 31°, which can be used as a typical reference value for achieving thermal comfort [113], [114]. In general, the skin temperature is lower in areas featured by low perfusion, such as the anterior proximal locations, and higher in areas with high perfusion, e.g.…”

Section: A Thermoregulation and Comfort: A Close Relationshipmentioning

confidence: 99%

“…A proposed solution is based on the phase change of an ice pack, used as a dedicated element to absorb heat in a cooling system integrated into the socket wall (Fig. 14a) [121]. Using a preliminary prototype, its cooling capability resulted from 6.6 W to 15.6 W thanks to the adjustable thermal resistance obtained through the flow channel array.…”

Section: B Existing Solutions To Avoid Stump Overheatingmentioning

confidence: 99%

“…Thermoregulatory systems within prosthetic sockets based on the phase change of an ice pack (a), on a closed-loop system with a thermal pump (b), on a heat sink and a fan (c) and on a cooling channel with an air pump (d) (a, c and d reproduced with permission from Elsevier[121],[123],[124], b photo courtesy Kamiar Ghoseiri/ Department of Orthotics and Prosthetics, University of Social Welfare and Rehabilitation Sciences).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Sockets for Limb Prostheses: A Review of Existing Technologies and Open Challenges

Paternò

Ibrahimi

Gruppioni

et al. 2018

IEEE Trans. Biomed. Eng.

188

204

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In the prosthetics field, one of the most important bottlenecks is still the human-machine interface, namely the socket. Indeed, a large number of amputees still rejects prostheses or points out a low satisfaction level, due to a sub-optimal interaction between the socket and the residual limb tissues. The aim of this paper is to describe the main parameters (displacements, stress, volume fluctuations and temperature) affecting the stump-socket interface and reducing the comfort/stability of limb prostheses. In this review, a classification of the different socket types proposed in the literature is reported, together with an analysis of advantages and disadvantages of the different solutions, from multiple viewpoints. The paper then describes the technological solutions available to face an altered distribution of stresses on the residual limb tissues, volume fluctuations affecting the stump overtime and temperature variations affecting the residual tissues within the socket. The open challenges in this research field are highlighted and the possible future routes are discussed, towards the ambitious objective of achieving an advanced socket able to self-adapt in real-time to the complex interplay of factors affecting the stump, during both static and dynamic tasks.

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Section: A Thermoregulation and Comfort: A Close Relationshipmentioning

confidence: 99%

Section: B Existing Solutions To Avoid Stump Overheatingmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Sockets for Limb Prostheses: A Review of Existing Technologies and Open Challenges

Paternò

Ibrahimi

Gruppioni

et al. 2018

IEEE Trans. Biomed. Eng.

188

204

View full text Add to dashboard Cite

show abstract

“…• New materials to be used for liner that could eliminate the abnormal thermal environment around the residual limb. Figure 12: Experimental model with temperature sensor locations [28]. Figure 13: Outer socket temperature contours of (a) the control socket (b) the modified socket using steady temperature input [28].…”

Section: Future Remarksmentioning

confidence: 99%

“…Webber and Davis [28] presented a design of a novel prosthetic socket. Two sockets were studied both experimentally and numerically.…”

Section: Introductionmentioning

confidence: 99%

Thermal Assessment for Prostheses: State-of-the-Art Review

Abbood¹,

Wu²,

Sundén³

2017

Int. J. CMEM

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Hundreds of young people have had limbs amputated after being wounded by civil wars, explosions or gunshots. Heat and perspiration within a prosthetic socket are the most common side effects of reduced quality life for prosthesis. Besides, the environment between liner and skin is an ideal host of residual limb skin problems such as contact dermatitis and bacterial infections. It is important to minimize the limiting heat transfer to improve amputee safety and comfort. Usually, when there is a skin problem, the treatment requires the amputee not to wear his/her prosthesis for an extended period of time. This functional loss can adversely affect the amputee's physical, mental and emotional well-being. This work aims to highlight a number of important issues concerning the effect of thermal conditions on prosthetics to shed light on new design methods for prosthetics.

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Constructal design of a PCM cylindrical heat sink with three‐branched, two‐stages dendritic tubes

Ridha,

Ezzat

2024

Heat Trans

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Amputees who use prosthetic limbs suffer from the problem of high contact temperature between the socket of the prosthetic limb and the amputated part and lack of evaporation of sweat. These conditions lead to discomfort and failure to perform functions properly. In addition, these conditions help generate ulcers and accumulate harmful bacteria in this area. This paper presents a heatsink design to extract heat from the contact area. A cylindrical heat sink is designed for phase‐changing materials with three branched tubes in two stages. The current heat sink is used to cool the contact area between the amputated part and the socket in the lower prostheses. Three distributions of pipe branches are proposed. The distribution and pipe lengths were obtained using a constructal design method. In the constructal design, the lengths of the branched tubes were the degrees of freedom, the objective function was the minimization of the inlet temperature to the heat sink, and the constraint was the volume of the cylindrical heat sink. The metabolic heat transfer during exercise was estimated and its value was used to calculate the size of the cylindrical heatsink and the selection of the phase change material by testing three of them: water, tridecane, and dodecane. It was found that water gives the highest latent heat of melting and the lowest volume in addition to its availability. On the other hand, two cooling fluids were tested: water and air. It was found that water as a cooling fluid gave the lowest flow and the largest heat capacity. Constructal theory was used to design a cylindrical heat sink using branched tubes for the coolant in two steps: the first with three branches, and the second with nine branches. The degree of freedom for constructal theory was the length of the branches through the choice of their end locations. It was found that the branches of the highest length led to a reduction in temperature from 40°C to 15.48°C compared with the single tube, which reduced the temperature to 23.87°C. All tests recorded a pressure drop within the acceptable range of 3.1–5.43 Pa for the branches examined. The research demonstrated that using constructal theory achieved the best thermal dissipation within a restricted volume.

show abstract

An automatic and portable prosthetic cooling device with high cooling capacity based on phase change

Cited by 11 publications

References 17 publications

Sockets for Limb Prostheses: A Review of Existing Technologies and Open Challenges

Sockets for Limb Prostheses: A Review of Existing Technologies and Open Challenges

Thermal Assessment for Prostheses: State-of-the-Art Review

Constructal design of a PCM cylindrical heat sink with three‐branched, two‐stages dendritic tubes

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