CN114588534A - A non-invasive high-density multi-channel electrode array - Google Patents

Abstract

The invention discloses a non-invasive high-density multi-channel electrode array. It includes: the device comprises an interface, a flexible circuit board, electrodes, leads and a hydrogel patch; the interface can be connected with different electrophysiology workstations through the patch cord, when being connected with the signal acquisition workstation, can carry out surface electromyography signal collection, when being connected with the electro photoluminescence ware, can carry out function rehabilitation training. The hydrogel patch is adhered to an electrical stimulation target electrode of the flexible electrode array, and one side, to which the hydrogel patch is adhered, is adhered to the skin, the electrode array is mainly applied to the arm, but can also be applied to the trunk or the leg according to the requirement. The electrode adopts an array design, can be adapted to different electrophysiological workstations and is used for electromyographic signal acquisition or muscle rehabilitation training; it has high safety and is beneficial to the rehabilitation of patients.

Description

A non-invasive high-density multi-channel electrode array

technical field

The invention relates to the technical field of medical instruments, in particular to a non-invasive high-density multi-channel electrode array.

Background technique

After decades of development, researchers have developed a non-invasive multi-channel electrode array for contacting arm muscle tissue. The development process is mainly from single-channel to multi-channel development, which improves the robustness of the electrode array. However, the current multi-channel functional electrical stimulation system is not very wearable, and the number of channels is not enough. Now a non-invasive high-density electrode array for adapting to different human arm sizes is proposed.

After a search of the prior art, it was found that Marchis, C. De et al. proposed a method in "Multi-contact functional electrical stimulation for hand opening: electrophysiologically driven identification of the optimal stimulation site." published in Journal of NeuroEngineering and Rehabilitation 13 (2016). The multi-channel electrode array, whose position is relatively fixed, cannot be adapted to users of different arm sizes, and has only 28 channels, so the channel selectivity is poor. A multi-channel electrode array mentioned in "A Wearable Multi-Site System for NMES-BasedHand Function Restoration." by Crema, A et al. in IEEE Transactions on Neural Systems and Rehabilitation Engineering 26 (2018): performance and increased the number of channels, but the above problems still exist.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a non-invasive high-density multi-channel electrode array, which is used for EMG signal acquisition or muscle rehabilitation training, and has the characteristics of convenient wearing, strong adaptability, etc. The workload of clinicians and the increase in the number of electrode channels improve the selectivity of stimulation targets and are more conducive to patient rehabilitation.

The object of the present invention can be realized through the following technical solutions:

A non-invasive high-density multi-channel electrode array, which is used for electromyographic signal acquisition or muscle rehabilitation training, including

Including: flexible circuit board, electrodes, leads, interface and hydrogel patch; the flexible circuit board is designed in three-section according to the shape of the forearm, the head end is the first section, and the length of the first section is 20-70 mm. The width ranges from 30-90 mm, the middle part is the second segment, the second segment length ranges from 20-70 mm, the width ranges from 50-130 mm, the tail end is the third segment, and the third segment length ranges from 20-70 mm mm, the width range is 80-180 mm, the width of the flexible circuit board increases in turn from the head end to the tail end; a number of electrodes are arranged on the flexible circuit board to form an electrode array, and the electrodes are connected to the interface for peripheral connection through leads. A hydrogel patch is attached to some or all of the electrodes.

In the present invention, the diameter of the electrodes is in the range of 1-16 mm, the horizontal and vertical adjacent spacing is in the range of 2-20 mm, and the distance between the outermost peripheral electrode and the near edge of the flexible circuit board is in the range of 2.5-20 mm. Further preferably, the number of electrodes in each row of the electrode array from the head end to the tail end is: 5, 5, 7, 7, 9, 9, 9, 9, 9, 9, 11, 11, 13, 13, a total of 126 an electrode.

In the present invention, the interface is arranged at the tail end of the flexible circuit board. The interface can be connected with different electrophysiological workstations through patch cords. When connected with a signal acquisition workstation, surface EMG signal acquisition can be performed, and when connected with an electrical stimulator, hand function rehabilitation training can be performed.

In the present invention, rectangular grooves are arranged on both sides of each section of the flexible circuit board for connecting fasteners, so as to realize the fast and wear of the non-invasive high-density multi-channel electrode array. It can be connected by connecting parts such as straps and Velcro. The entire arm (leg or torso) can be surrounded by two of the flexible electrode arrays.

In the present invention, the longitudinal centerlines of each row of the electrode array formed by several electrodes are coincident, and the longitudinal centerline is the symmetry axis of the electrode array.

In the present invention, the lead spacing on each side is 0.01-1 mm, and the outermost lead is 1.2 mm-30 mm away from the center line of the adjacent column electrodes.

In the present invention, the lead of the electrode at the head end on the flexible circuit board is closer to the electrode corresponding to the lead than the electrode at the tail end.

In the present invention, the hydrogel patch is attached to the electrical stimulation target electrode of the flexible electrode array, and the side with the hydrogel patch is attached to the skin in an adhesive manner.

The present invention further includes a computer program product with a program code portion, which is executed on the above-mentioned non-invasive high-density multi-channel electrode array, and is used to control the device to collect electromyographic signals or output electrical stimulation signals.

In the present invention, the electrode size and mutual spacing can be modified according to actual needs, and the design of the high-density array structure can be suitable for people with different arm sizes. For thicker people, more electrodes can be used. In addition, the high-density electrode array can also be applied to the torso or legs.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention can adapt to the arm/leg/torso size of different patients;

2. The present invention adopts the array design, which can realize the rapid wearing of the individual and reduce the preparation time before the electrode array is used;

3. Each electrode array of the present invention can contain 126 electrodes or more, which increases the selectivity of stimulation targets;

4. The invention adopts an array design, which can be adapted to different electrophysiological workstations;

5. The present invention has high safety and is beneficial to the recovery of patients.

Description of drawings

FIG. 1 is a schematic structural diagram of a non-invasive high-density electrode array.

Labels in the figure: 1-interface, 2-flexible circuit board, 3-electrode, 4-lead, 5-hydrogel patch.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "head end", "tail end", "near side", "lateral", "longitudinal", "length", etc. indicate orientation or positional relationships, and are only for convenience The invention is described and simplified without indicating or implying that the components or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

A non-invasive multi-channel high-density electrode array includes: an interface 1 , a flexible circuit board 2 , a lead 3 , an electrode 4 , and a hydrogel patch 5 . The flexible circuit board 2 is designed in three sections according to the shape of the forearm. The length of the first section is 20-70 mm, the width is 30-90 mm, and the length of the second section is 20-70 mm and the width is 50-130 mm. mm, the third segment has a length ranging from 20-70 mm and a width ranging from 80-180 mm. Interface 1 can be connected to different electrophysiological workstations through patch cords. When connected to a signal acquisition workstation, surface EMG signal acquisition can be performed, and when connected to an electrical stimulator, hand function rehabilitation training can be performed. The size and mutual spacing of the electrodes 4 can be modified according to the actual needs. The designed electrode array contains 126 electrodes. 9, 9, 9, 9, 11, 11, 13, 13. The longitudinal centerlines of each row of the electrode array coincide, which is the symmetry axis of the electrode array. The electrode array can be applied to the commonly used electrophysiological workstations, and combined with the size range of the human arm, the electrode diameter range is 1-16 mm, the horizontal and vertical adjacent interval range is 2-20 mm, and the outermost electrode is close to the flexible electrode array. The side distance range is 2.5-20mm, the distance between the leads 4 on each side is 0.01-1 mm, and the distance between the outermost leads 3 is 1.2mm-30mm from the center line of the adjacent column electrodes. The design of the high-density array structure can be suitable for people with different arm sizes. For people with relatively thin arms, only the electrodes in the central area can be used, while for people with relatively thick arms, more electrodes can be used, which increases the selectivity of electrode targets. In addition, the high-density electrode array can also be applied to the torso or legs. The hydrogel patch 5 is attached to the electrical stimulation target electrodes of the flexible electrode array, and the side with the hydrogel patch 5 is attached to the arm skin in an adhesive manner. Two flexible electrode arrays can be used to surround the entire arm, and the two flexible electrode arrays can be connected by connecting pieces such as straps and Velcro.

Example 1

Paste the hydrogel patch 5 on the electrical stimulation target electrodes of two flexible electrode arrays, one flexible electrode array is attached to the inner side of the forearm, and the other flexible electrode array is attached to the outer side of the forearm, so that the hydrogel patch 5 is attached. Fully contact with the skin, fasten the two flexible electrode arrays with Velcro, so that the flexible electrode arrays are closely attached to the skin, and the two hydrogel patch electrodes are attached to the biceps as ground electrodes and reference electrodes, respectively. The flexible electrode array is connected with the electromyographic signal collector through a patch cord, and the collector is controlled by the host computer software to collect the surface electromyography signal.

Example 2

Paste the hydrogel patch 5 on the electrical stimulation target electrodes of two flexible electrode arrays, one flexible electrode array is attached to the inner side of the forearm, and the other flexible electrode array is attached to the outer side of the forearm, so that the hydrogel patch 5 is attached. Make full contact with the skin, fasten the two flexible electrode arrays with Velcro, so that the flexible electrode arrays are closely attached to the skin, and the two hydrogel patch electrodes are attached to the deltoid muscle as ground and reference. The wiring is connected with the EMG signal collector, and the collector is controlled by the host computer software to collect the surface EMG signal.

In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, parameters or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention.

Claims (9)

1. A non-invasive high-density multi-channel electrode array, which is used for electromyographic signal acquisition or muscle rehabilitation training, and its special features are: The feature is that it includes: a flexible circuit board (2), electrodes (4), leads (3), an interface (1) and a hydrogel patch (5); the flexible circuit board (2) is designed to be three-dimensional according to the shape of the forearm Segment type, its head is the first segment, the length of the first segment is 20-70 mm, the width is 30-90 mm, the middle part is the second segment, the length of the second segment is 20-70 mm, and the width is within the range of 30-90 mm. The length of the third section is 20-70 mm and the width is 80-180 mm. The width of the flexible circuit board (2) increases in turn from the head end to the tail end; A plurality of electrodes (3) are arranged on the flexible circuit board (2) to form an electrode array, the electrodes (4) are connected to the interface (1) for connecting peripheral devices through the lead wire (3), and the hydrogel patch (5) is attached to the on some or all of the electrodes (4). 2. The non-invasive high-density multi-channel electrode array according to claim 1, wherein the diameter of the electrodes (4) ranges from 1 to 16 mm, the horizontal and vertical adjacent spacing ranges from 2 to 20 mm, and the outermost electrodes (4 ) and the flexible circuit board (2) near-edge distance in the range of 2.5-20 mm. 3 . The non-invasive high-density multi-channel electrode array according to claim 1 , wherein the interface ( 1 ) is arranged at the tail end of the flexible circuit board ( 2 ). 4 . 4. The non-invasive high-density multi-channel electrode array according to claim 1, characterized in that, rectangular grooves are arranged on both sides of each section of the flexible circuit board (2) for connecting fasteners, so as to realize the non-invasive high-density electrode array. Tight fit for dense multi-channel electrode arrays. 5 . The non-invasive high-density multi-channel electrode array according to claim 1 , wherein the longitudinal centerlines of each row of the electrode array formed by several electrodes ( 4 ) coincide. 6 . 6 . The non-invasive high-density multi-channel electrode array according to claim 1 , wherein the lead ( 3 ) on each side is spaced 0.01-1 mm, and the outermost lead ( 4 ) is separated from the adjacent column electrodes ( 4 ). 7 . Center line 1.2mm-30mm. 7. The non-invasive high-density multi-channel electrode array according to claim 1, wherein the lead (3) of the electrode (4) at the head end on the flexible circuit board (2) is compared with the electrode (4) at the tail end. closer to the electrode (3) corresponding to the lead (3). 8. The non-invasive high-density multi-channel electrode array according to claim 1, wherein the interface (1) is connected to different electrophysiological workstations through patch cords: when connected to a signal acquisition workstation, it is used for surface EMG signal acquisition; when connected with an electrical stimulator, it is used for functional rehabilitation training. 9. A computer program product comprising a program code portion, which is implemented in a non-invasive high-density multi-channel electrode array according to claim 1, for controlling the device to collect electromyographic signals or output electrical stimulation signals .

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