106 results about "Basilar membrane" patented technology

A prosthetic hearing implant capable of independently and concurrently processing multiple audio input signals such that each audio input signal is separately utilized to stimulate the basilar membrane of the implant recipient. A prosthetic hearing implant of the present invention simultaneously receives discrete audio signals from each of one or more audio sources, generates a separate set of one or more stimulations signals for each audio signal, and concurrently applies the stimulation signals to the cochlear. Different channels of stimulation may be allocated to each audio input signal. Alternatively, different modes of stimulation may be used for each input signal. Or, in yet another example, the audio input signals may be time-multiplexed such that the input signals are applied in alternating timeslots. Or, in yet other examples, the input signals may be applied using a combination of stimulation channels, modes of stimulation, and alternating time slots. The stimulation signals may be delivered to the same or different electrodes depending on the quantity and frequency component of the received audio input signals, the quantity of available stimulation channels, and other factors.

A new speech processing strategy, termed Frequency Modulated Stimulation (FMS), is provided for use with a cochlear prosthetic. The FMS strategy advantageously mimics the neural firing patterns of the healthy cochlea by controlling when and where stimulation pulses are presented in the cochlea. The benefits of this approach are its simplicity and its ability to provide temporal information at relatively low power consumption. The stimulation that results has high temporal precision and a low pulse presentation rate. The power efficiency of the FMS strategy is three to six times greater than that of a CIS strategy with comparable thresholds. The FMS strategy depends on the probability that at any point along the basilar membrane the ganglion cells are most likely to respond during the upward motion of the basilar membrane, when the hair cells are pushed toward the tectorial membrane. At low frequencies, this probability accounts for phase locking of the neurons to each peak of the motion. At high frequency locations, phase locking occurs at integer multiples of the vibration cycles because the vibration of the membrane is faster than the refractory period of the neurons. The FMS strategy provided by the invention takes advantage of the natural behavior of the ganglion cells by outputting a biphasic pulse at the preset integer multiples of the vibration cycles. Integer multiples are determined by counting the positive-to-negative zero crossings, or equivalent frequency counting, at the output of the band pass filters that decompose the incoming audio signal(s).

The invention relates to a method of generating a place-frequency map for accurate positioning of a cochlear implant whereby the place-frequency map is used to relate a physical position of the cochlear implant to a tonotopic map of the basilar membrane / spiral ganglion. The invention also relates to a method of electrically positioning of an already inserted cochlear implant within the cochlea to provide stimuli to only the parts of the cochlea that have reduced or no residual hearing.

The invention discloses a method for preparing a nanofiltration membrane by adopting a layer-by-layer self-assembly method, and relates to a preparation method of a nanofiltration membrane, aiming at solving the problems that a nanofiltration membrane prepared by adopting an existing method cannot have both good interception performance and high water flux. The method comprises the following steps: preparing a polyacrylonitrile solution, preparing a polyacrylonitrile basilar membrane, preparing a treated polyacrylonitrile basilar membrane, assembling a layer of polyethlenimine, assembling a layer of graphene oxide, and reassembling polyethlenimine and graphene oxide, thus obtaining the nanofiltration membrane. According to the method disclosed by the invention, a layer-by-layer self-assembly method is adopted, polyethlenimine and graphene oxide are adopted for modifying a PAN membrane, so that the hydrophilia and the pore size of the surface of the membrane are effectively adjusted; because the membrane is relatively thin, relatively large flux can be obtained, and the obtained nanofiltration membrane has good interception performance. The method can be applied to the fields of antibiotics separating, fruit juice concentrating and seawater desalting.

The invention relates to a thin-reducing and high impermeable liquid packaging membrane and a manufacturing method thereof. The product comprises a polyvinyl basilar membrane, a high impermeable polyvinyl alcohol layer, a composite adhesive layer and a protective polythene membrane layer, wherein, the polyvinyl basilar membrane comprises an outer layer, a middle layer and an inner layer and the outer layer and the middle layer comprise at least one of the two materials which are medium-density polythene or high-density polythene. The manufacturing method of the product comprises the steps of the preparation of the polyvinyl basilar membrane, the preparation of polyvinyl alcohol coating liquid and the preparation of the protective polythene membrane layer, coating and compounding, wherein, the polyvinyl alcohol coating liquid is diluted and the diluted polyvinyl alcohol coating liquid is coated on the outer layer of the polyvinyl basilar membrane to form the high impermeable polyvinyl alcohol layer and then the protective polythene member layer and the polyvinyl alcohol coating layer are compounded, cured and cut. The product of the invention has low thickness, good rigidness, high impermeable property, environmental protection, convenient use, low cost and simple technique.

A method and device for processing signals representing speech or audio via a plurality of filters that approximate behaviors of the basilar membrane of human cochlea. Each of the plurality of filters is formed from a mother filter via the dilation and a shift in time and has the similar impulse response of the basilar membrane to the frequency band for which the filter represents. Any process can be conducted and any feature can be extracted in the domain of the filters' outputs for applications, such as noise reduction, speech synthesis, coding, and speech and speaker recognition. Processed signals can be synthesized back to the time domain via an inverse cochlear transform.

The invention relates to a method of generating a place-frequency map for accurate positioning of a cochlear implant whereby the place-frequency map is used to relate a physical position of the cochlear implant to a tonotopic map of the basilar membrane / spiral ganglion. The invention also relates to a method of electrically positioning of an already inserted cochlear implant within the cochlea to provide stimuli to only the parts of the cochlea that have reduced or no residual hearing.

The present invention relates to dry film, microlens and the preparing method thereof. Said dry film contains (I) the basilar membrane having a surface with the three-dimensional ten-point average roughness SRz below 2.2 mum and the three-dimensional maximum height SRmax the same as 4.0 mum and a thickness from 10 mum to 50 mum; (II) the radioactive ray sensibility resin composition layer with the thickness from 2mum to 200mum laminated on the surface of said basilar membrane (I); and (III) the cover membrane covering said radioactive ray sensibility resin composition layer (II).

Specialized surgical burrs (122, 124, 162, 164) permit safely fenestrating the otic capsule bone adjacent to the scala tympani (44) of the cochlea (34) without damaging the basilar membrane (52) or organ of cordi. The invention disclosed herein may also be adopted for safely fenestrating other areas of the inner ear such as the scala vestibuli (42), bony labyrinth of semicircular canals, or walls of the vestibule, or perhaps even the oval or round windows thereof.

The sound processor and method uses a model of basilar membrane motion to select stimuli, based upon the predicted motion which the acoustic signal presented would produce in an acoustically excited normally hearing cochlea. The filter; used, in contrast to single channel per electrode approaches, cover multiple channels and overlap with each other. Consequently the stimuli presented produce a neural excitation pattern which approximates the spatio-temporal travelling wave observed on the basilar membrane in an acoustically excited normally hearing cochlea. Preferably, the predicted electrode stimuli are based upon the instantaneous predicted amplitude of the electrode location.

The invention relates to the field of medical devices and discloses a lower opener for an endoscope. According to the lower opener, two opener heads are symmetrical to each other and are connected and matched with each other, and can be separated and drawn; when the two opener heads are drawn, a calabash shape with a circular blunt pointed end can be formed; during operation, the circular blunt pointed end punctures a basilar membrane, the edge of crevasse is fixed on the middle concave parts of the calabash-shaped opener heads, and the opener heads are separated to open and expand the crevasse to meet the operation requirements; and the puncturing and opening functions can be realized by using one machine; and the lower opener is simple in structural design and ensures that operation is easy and convenient to implement, and the operation effect is safe and effective. The inner sides of handheld handles are provided with tooth plates which are provided with multi-tooth lock catches matched with each other; and by fixing the positions of the handheld handles, the separating and drawing width of the opener heads can be controlled, the size of the opened mouth can be controlled conveniently, and the operation is convenient to implement. The lower opener is made of metal materials, so that the lower opener can be disinfected and sterilized at high temperature, cannot be damaged easily, can be used repeatedly, and reduces operation cost.