Contributions of Intrinsic Visco-Elastic Torques During Planar Index Finger and Wrist Movements

2012 ◽  
Vol 59 (2) ◽  
pp. 586-594 ◽  
Author(s):  
A. D. Deshpande ◽  
N. Gialias ◽  
Y. Matsuoka
Keyword(s):  
Index Finger ◽  
Planar Index

Development of Underactuated Mechanical Fingers Based on Anthropometric Data and Anthropomorphic Tasks

2014 ◽  
Author(s):  
Nina Robson ◽  
James Allington ◽  
Gim Song Soh
Keyword(s):  
Theoretical Foundation ◽  
Index Finger ◽  
Degree Of Freedom ◽  
Anthropometric Data ◽  
Open Problems ◽  
Kinematic Synthesis ◽  
Kinematic Chains ◽  
Curvature Effects ◽  
Order Task ◽  
Planar Index

This paper describes a systematic method for the kinematic synthesis of one degree-of-freedom robotic fingers that incorporate multi-loop kinematic structures with second order task specifications, such that the fingers do not violate normal direction and curvature constraints imposed by contact with objects. We show how to use these contact and curvature effects to formulate the synthesis equations for the design of a planar index finger, based on anthropomorphic back-bone chain and anthropomorphic task. The prototype of the finger is described in the end of the paper. It is important to note, that the theoretical foundation presented in this paper, assists in solving some of the open problems of the field, providing preliminary results on the synthesis of one degree-of-freedom kinematic chains, based on human’s finger dimensions and novel task specifications that incorporate curvature constraints, with future applications in grasping and object manipulation.

Heterodigital Free Flap of Index Finger Amputee for Coverage of the Long Finger Soft Tissue Defect

2013 ◽  
Vol 22 (2) ◽  
pp. 82-85 ◽  
Author(s):  
So-Min Hwang ◽  
Jang Hyuk Kim ◽  
Hong-Il Kim ◽  
Yong-Hui Jung ◽  
Hyung-Do Kim
Keyword(s):  
Soft Tissue ◽  
Free Flap ◽  
Index Finger ◽  
Soft Tissue Defect ◽  
Tissue Defect

Context-dependent relationship in high-resolution micro-ECoG studies during finger movements

2020 ◽  
Vol 132 (5) ◽  
pp. 1358-1366
Author(s):  
Chao-Hung Kuo ◽  
Timothy M. Blakely ◽  
Jeremiah D. Wander ◽  
Devapratim Sarma ◽  
Jing Wu ◽  
...  
Keyword(s):  
High Resolution ◽  
Sensorimotor Cortex ◽  
Index Finger ◽  
Hand Movement ◽  
Cortical Activation ◽  
Hand Movements ◽  
Finger Movements ◽  
Thumb Movement ◽  
Neurosurgical Patients ◽  
The Relationship

OBJECTIVEThe activation of the sensorimotor cortex as measured by electrocorticographic (ECoG) signals has been correlated with contralateral hand movements in humans, as precisely as the level of individual digits. However, the relationship between individual and multiple synergistic finger movements and the neural signal as detected by ECoG has not been fully explored. The authors used intraoperative high-resolution micro-ECoG (µECoG) on the sensorimotor cortex to link neural signals to finger movements across several context-specific motor tasks.METHODSThree neurosurgical patients with cortical lesions over eloquent regions participated. During awake craniotomy, a sensorimotor cortex area of hand movement was localized by high-frequency responses measured by an 8 × 8 µECoG grid of 3-mm interelectrode spacing. Patients performed a flexion movement of the thumb or index finger, or a pinch movement of both, based on a visual cue. High-gamma (HG; 70–230 Hz) filtered µECoG was used to identify dominant electrodes associated with thumb and index movement. Hand movements were recorded by a dataglove simultaneously with µECoG recording.RESULTSIn all 3 patients, the electrodes controlling thumb and index finger movements were identifiable approximately 3–6-mm apart by the HG-filtered µECoG signal. For HG power of cortical activation measured with µECoG, the thumb and index signals in the pinch movement were similar to those observed during thumb-only and index-only movement, respectively (all p > 0.05). Index finger movements, measured by the dataglove joint angles, were similar in both the index-only and pinch movements (p > 0.05). However, despite similar activation across the conditions, markedly decreased thumb movement was observed in pinch relative to independent thumb-only movement (all p < 0.05).CONCLUSIONSHG-filtered µECoG signals effectively identify dominant regions associated with thumb and index finger movement. For pinch, the µECoG signal comprises a combination of the signals from individual thumb and index movements. However, while the relationship between the index finger joint angle and HG-filtered signal remains consistent between conditions, there is not a fixed relationship for thumb movement. Although the HG-filtered µECoG signal is similar in both thumb-only and pinch conditions, the actual thumb movement is markedly smaller in the pinch condition than in the thumb-only condition. This implies a nonlinear relationship between the cortical signal and the motor output for some, but importantly not all, movement types. This analysis provides insight into the tuning of the motor cortex toward specific types of motor behaviors.

Pseudosyndactylic Toe-to-Hand Transfer for Simultaneous Reconstruction of the Thumb and Index Finger

2003 ◽  
Vol 111 (1) ◽  
pp. 355-360
Author(s):  
Selçuk Işik ◽  
Mustafa Nişanci ◽  
Ergin Er ◽  
Haluk Duman
Keyword(s):  
Index Finger ◽  
Simultaneous Reconstruction

scholarly journals Anosmia as a Screening Tool for COVID-19 Infection: A Prospective Cohort Study

2021 ◽  
pp. 1-6
Author(s):  
Esra AlHamadani ◽  
Sania Zia ◽  
Ali AlRahma ◽  
Firas AlNajjar
Keyword(s):  
Odds Ratio ◽  
Screening Tool ◽  
Index Finger ◽  
Upper Respiratory Tract ◽  
Chain Reaction ◽  
The Public ◽  
Single Center Study ◽  
Upper Respiratory ◽  
Polymerase Chain ◽  
Low Sensitivity

<b><i>Objectives:</i></b> Several studies promoted anosmia as a possible isolated symptom for coronavirus disease 2019 (COVID-19). No studies used feasible methods of smell testing that the public would use to address the accuracy of these claims. <b><i>Methods:</i></b> This is a single-center study conducted between April 2020 and June 2020. The sense of smell was tested in vitally stable suspected COVID-19 patients with no/mild upper respiratory tract infection symptoms prior to nasopharyngeal swabbing for reverse-transcriptase polymerase chain reaction. Patients were instructed to close their eyes. Each nostril was tested separately while the other was blocked with the patient’s index finger. Patients inhaled from 2 concealed vials (coffee and strawberry essence) consecutively, kept within 30 cm of the nostril for 60 s. Patients who could not identify both odors with both nostrils were recorded as “anosmia.” <b><i>Results:</i></b> Out of 346 eligible subjects, 43 had anosmia of which 26 (60%) tested COVID-19 positive. χ<sup>2</sup> test showed a <i>p</i> value &#x3c;0.001. The test showed a sensitivity of 30% (95% confidence interval [CI] 21%, 41%) and specificity 94% (95% CI 90%, 96%). Logistic regression revealed an odds ratio of 5.9 (95% CI 3.0, 12) <i>p</i> value &#x3c;0.001. <b><i>Conclusion:</i></b> Given the low sensitivity (30%) of this method in detecting COVID-19 infection, we conclude that this method is not a useful screening tool for COVID-19 infection. The moderate negative predictive value (80%) is nongeneralizable.

scholarly journals Study of Glove Perforation during Hip Replacement Arthroplasty: Its Frequency, Location, and Timing

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Li Xiao Tao ◽  
Deepak Kumar Basnet
Keyword(s):  
Hip Replacement ◽  
Index Finger ◽  
Surgical Team ◽  
Perforation Rate ◽  
Surgical Gloves ◽  
Team Members ◽  
Hip Replacement Arthroplasty ◽  
Glove Perforation ◽  
Replacement Arthroplasty ◽  
Primary Hip Replacement

Objective. The aim of the study was to evaluate the location, timing, and frequency of glove perforation during hip replacement arthroplasty. Methods. Gloves worn by surgical team members in 19 primary hip replacement arthroplasties were assessed. The study was of a single gloving system. All the used gloves were collected at the end of the surgery and assessed visually and by using water inflation technique. Relevant data were collected at the time of surgery. Results. A total of one hundred and ninety-one surgical gloves were evaluated. Twenty-three glove perforations were noted in nineteen of the operations. Of these perforations 14 belonged to gloves worn by surgeon and first assistant (60.1%). Glove perforation in thumb, index finger, and palm was more common. More perforation occurred in the gloves worn in nondominant hand (52%) but was insignificant. Conclusion. Glove perforation in surgeries such as total hip arthroplasty is not uncommon. In this study of single gloving system glove perforation rate was 12.04%, whereas literature reports of glove perforation rate as low as 3.3% in elective orthopedic surgeries with double gloving system. As such emphasis should be given to wear double pair of gloves wherever this practice is uncommon.

Compression of the Distal Ulnar Nerve with Clawing of the Index Finger

HAND ◽  
1982 ◽  
Vol os-14 (1) ◽  
pp. 38-40 ◽  
Author(s):  
N. P. Packer ◽  
G. R. Fisk
Keyword(s):  
Ulnar Nerve ◽  
Distal Part ◽  
Similar Case ◽  
Index Finger ◽  
Motor Branch

A compression lesion of the distal part of the terminal motor branch of the ulnar nerve is presented. One similar case has been previously described (McDowell, 1977) but some unusual features are recorded here. The reported clinical varieties of lesions of the ulnar nerve in the hand are listed (Table 1).

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