Abstract: A multi-active region cascaded Bragg reflection waveguide edge-emitting diode laser, including a substrate, a buffer layer, an N-type cladding layer, an N-type waveguide layer, a cascaded multi-active region, a P-type waveguide layer, a P-type cladding layer and a capping layer arranged sequentially from bottom to top. The waveguide layer adopts a Bragg reflection waveguide structure formed by periodic arrangement of high and low refractive index layers. The cascaded multi-active region includes multiple active regions, tunnel junctions and a confinement layer. A fundamental mode near field of the laser is formed by periodic oscillating peaks, with an envelope close to Gaussian distribution. There are large-swing oscillation peaks near the cascaded multi-active region. The active regions are located at peaks of the fundamental mode near field, and tunnel junctions are inserted at troughs with low light intensity.

Abstract: A sampling capsule is provided. The sampling capsule includes an enclosure, a sampling assembly, a sample drawing assembly and a control module. The sampling assembly includes a sample chamber arranged in the enclosure, an outer sampling port on the enclosure, a sampling tube connecting the outer sampling port and the sample chamber, and a sampling switch for opening or closing the connecting tube. The sample drawing assembly includes a sample drawing port on the enclosure and connected to the sample chamber, and a silicone plug fitted in the sample discharging port. The control module includes a microprocessor communicating with the sampling switch.

Abstract: The present invention provides a capsule for fluid sampling and drug delivery comprising: an enclosure, comprising a first enclosure, a second enclosure, at least a portion of the first enclosure comprising a support body having a plurality of first openings, a liquid-proof air-permeable membrane located at the first openings; a sampling/drug delivery assembly, comprising a storage chamber at least partially enclosed by the liquid-proof air-permeable membrane, a temporary storage chamber located in the enclosure, a first one-way element connecting the temporary storage chamber to outside of the capsule, a second one-way element connecting the temporary storage chamber to the storage chamber, and a pump changing pressure in the temporary storage chamber, wherein the first one-way element and the second one-way element have same direction of access; and a control module, comprising a microprocessor in communication with the pump. The capsule can realize multiple times of sampling and drug delivery.

Abstract: The present invention provides a capsule for fluid sampling and drug delivery including: an enclosure; a sampling/drug delivery assembly, including a storage chamber arranged in the enclosure, a first one-way element and a second one-way element communicating with outside of the capsule and the storage chamber, and a pump changing pressure in the storage chamber, wherein the first one-way element and the second one-way element have same direction of access; and a control module, including a microprocessor in communication with the pump. The capsule can realize multiple times of sampling and drug delivery by means of control flow direction of sample or drug through the first one-way element and the second one-way element, and by changing the pressure of the storage chamber through the pump.

Abstract: A positioning method for a swallowable device is provided for positioning the in vivo swallowable device. The method includes: entering the m-th positioning period, m?1; energizing p electromagnetic coils simultaneously or sequentially, p?2; obtaining the actual magnetic field information Bwt sensed by the swallowable device each time the electromagnetic coils under energized, 1?t?p; calculating the individual magnetic field information Bi at the swallowable device when the electromagnetic coils are separately energized, 1?i?p; detecting the pitch angle and roll angle of the swallowable device in the m-th positioning period; calculating the yaw angle and spatial coordinates of the swallowable device in the m-th positioning period according to the pitch angle and roll angle and the individual magnetic field information Bi.

Abstract: A control method and a control system for a capsule endoscope are provided. The control method comprises acquiring a frame rate of the capsule endoscope. The frame rate is the number of frames of images captured by the capsule endoscope per unit time. The control method further comprises controlling the number of radio frequency transmission channels that are turned on according to the frame rate. The number of radio frequency transmission channels that are turned on is at least two, and the radio frequency transmission channels transmit the captured images. The control method and control system for the capsule endoscope can adaptively distribute a plurality of radio frequency transmission channels according to the real-time position of the capsule endoscope, and further turn on the radio frequency transmission channels to transmit a plurality of signals synchronously or asynchronously.

Abstract: A sampling capsule is provided. The sampling capsule includes an enclosure, a sampling assembly, a sample drawing assembly and a control module. The sampling assembly includes a sample chamber arranged in the enclosure, an outer sampling port on the enclosure, a sampling tube connecting the outer sampling port and the sample chamber, and a sampling switch for opening or closing the connecting tube. The sample drawing assembly includes a sample drawing port on the enclosure and connected to the sample chamber, and a silicone plug fitted in the sample discharging port. The control module includes a microprocessor communicating with the sampling switch.

Abstract: A sampling capsule and sampling capsule system are provided. The sampling capsule includes an enclosure, a sampling assembly, a mucosal flora collection auxiliary assembly and a control module. The sampling assembly includes a sample chamber disposed in the enclosure, an outer sampling port on the enclosure, a connecting tube connecting the outer sampling port and the sample chamber, and a sampling switch for opening or closing the connecting tube. The mucosal flora collection auxiliary assembly includes a vibration motor disposed in the enclosure, and/or a counterweight at the outer sampling port. The control module includes a microprocessor in communication with the sampling switch and the vibration motor.

Abstract: The present invention provides a capsule endoscope and a control method thereof. The capsule endoscope includes an enclosure, a photographing device and a light source device housed in the enclosure. The light source device illuminates inner surface of digestive tract with illumination light, and the photographing device captures images of the digestive tract based on the illumination light. The enclosure comprises a main enclosure and an optical dome enclosed at one end of the main enclosure. The optical dome is disposed at the front end of the light source device. The light source device comprises a first light source module and a second light source module. The wavelength ranges of lights emitted from the first light source module and the second light source module are different, and the first light source module and the second light source module are arranged with a space around the photographing device.