Sensory Feedback System

感觉反馈系统

基本信息

批准号：
60850073
负责人：
HOSHIMIYA Nozomu
金额：
$ 3.07万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850073/
关键词：
Sensory Sensory Feedback Functional Electrical Stimulation FES Phantom Sensation 感覚代行

项目摘要

Functional Electrical Stimulation(FES) is very efficient for the restoration of the paralyzed upper extremities. Functional hand movements have been restored in C5-6 quadriplegic patients by the microcomputer based multi-channel FES system which we developed.Such patients are deprived of not only motor function but also sensory function. To restore the sensation relating to the FES-produced hand movements, we have studied the electrocutaneous stimulation methods. Such patients have skin sensation only in the upper part above the shoulders.(1)We investigated the basic characteristics of the shoulder skin sensation to the electrical stimulation on the following points ; absolute threshold and pain threshold as a function of stimulation and their dependence on the pulse repetion frequency, frequency resolution, spatial resolution, temporal resolution, etc..(2)We also investigated electrical "phantom sensation". Subject can feel the moving sense between the two pairs of the stimulation electrodes. An effective new method to produce the phantom image are proposed. The amplitude of the current pulse trains applied to two separate electrodes are modulated complementarily to each other ; one increases while the other decreases. The amount of modulation must be modified by the combination of two stimuli which gives subjects almost even sensation of the fused images. Qualitative and quantitative characteristics of the phantom sensation were revealed by this research project. In addition, widely moving phantom images could be produced by three channel arrangement. By these methods, analog quantities which reflect finger displacement or grasping pressure can be converted to smoothly moving phantom images with minimum number of electrodes.

功能性电刺激（FES）对于瘫痪上肢的恢复非常有效。我们开发的基于微机的多通道FES系统已经使C5-6四肢瘫痪患者恢复了功能性手部运动。此类患者不仅丧失了运动功能，还丧失了感觉功能。为了恢复与 FES 产生的手部运动相关的感觉，我们研究了皮肤电刺激方法。此类患者仅在肩部以上上部有皮肤感觉。(1)我们从以下几点研究了肩部皮肤感觉对电刺激的基本特征;绝对阈值和疼痛阈值作为刺激的函数及其对脉冲重复频率、频率分辨率、空间分辨率、时间分辨率等的依赖性。(2)我们还研究了电“幻觉”。受试者可以感受到两对刺激电极之间的移动感。提出了一种有效的幻影图像生成新方法。施加到两个独立电极的电流脉冲序列的幅度被互补地调制；一个增加，另一个减少。调制量必须通过两种刺激的组合来修改，这使得受试者对融合图像几乎有均匀的感觉。该研究项目揭示了幻觉的定性和定量特征。此外，通过三通道排列可以产生广泛移动的幻像图像。通过这些方法，可以用最少数量的电极将反映手指位移或抓握压力的模拟量转换为平滑移动的幻像图像。