45 results about "Endoscopic ultrasound" patented technology

An ultrasound transducer manufactured by using a micromachining process comprises: a first electrode into which a control signal for transmitting ultrasound is input; a substrate on which the first electrode is formed; a second electrode that is a ground electrode facing the first electrode with a prescribed space between the first and second electrodes; a membrane on which the second electrode is formed and which vibrates and generates the ultrasound when a voltage is applied between the first and second electrodes; a piezoelectric film contacting the membrane; and a third electrode electrically continuous to the piezoelectric film.

Systems and methods for treating tumors on or within internal organs of mammals that have been imaged with endoscopic ultrasound are described. The system uses an expandable bipolar electrode assembly that can be imaged by ultrasound and can penetrate, e.g., the stomach, intestine or bowel wall, etc. and be positioned in or around the tumor on an internal organ while being guided by an operator who visualizes its position with ultrasound imaging. It utilizes an electrode assembly that extends down an internal cavity in the endoscope to allow the operator to spread the electrodes for pulse delivery of a nanosecond pulsed electric field (nsPEF) to the tumor.

A notched tissue-collection needle configured similarly to a fine-needle-aspiration needle is provided with a cutting edge disposed in the notch and configured to excise tissue into the notch for collection. A stylet may be provided through a lumen of the needle during introduction into a patient body. The needle may be provided with echogenicity-enhancing features.

An endoscopic cryoablation apparatus for the ablation of unwanted tissues is disclosed. A method of utilizing the apparatus for ablating pancreatic cancer, gastrointestinal cancers, or other undesired tissue is also incorporated. The apparatus provides a cryoprobe needle tip covered by an outer sheath at a distal end of a catheter shaft such that the distal end includes a defined ablation zone. As implemented, the cryocatheter can be utilized alone or in combination with and endoscopic ultrasound. A moveable handle attached to the outer sheath is configured such that the handle retracts and protracts the outer sheath to expose and cover, respectively, the cryoprobe needle tip.

The invention relates to a computer-aided method for distinguishing the ultrasound endoscope image of pancreatic cancer, providing a method for extracting and classifying the textural features of the ultrasound endoscope image of pancreatic cancer. The computer-aided method can be used for the computer-aided analysis of the ultrasound endoscope image of pancreatic cancer. 9 general classes which totally comprise 69 textural features are extracted from the ultrasound endoscope image of pancreatic cancer by a digital image processing algorithm. Class spacing is adopted to serve as a separability criterion to preliminarily screen the features; then, a chronological progress search algorithm is used for further screening the features; and the features are classified by a support vector machine. The method is realized by extracting the textural features of the ultrasound endoscope image via the classifier, various objective quantized diagnostic indexes and a method for correctly describing and explaining the ultrasound endoscope image are built, and the accuracy on the ultrasound endoscope early diagnosis of the pancreatic cancer is improved.

The invention discloses an intravascular endoscopic ultrasound-OCT probe system, which is applied to imaging in an artery blood vessel. The probe system comprises an imaging probe which is constitutedby a slender hollow catheter, wherein a driving component, an imaging catheter and an interface module are sequentially arranged on a far-end part, a middle part and a near-end part of the interior of the slender hollow catheter, and the interface module is connected to an image processing and display system; the image processing and display system comprises an OCT tomography module, an ultrasonic tomographic image imaging module, a synchronous control unit, an image processing module, an image display module and a user interface; the driving component comprises an ultrasonic motor and an acousto-optical reflector; the ultrasonic motor is composed of an ultrasonic motor stator and an ultrasonic motor rotor; the imaging catheter comprises an OCT probe catheter part and an ultrasonic imaging catheter part; and the OCT probe catheter part is composed of a single mode fiber and a grin lens. According to the probe system provided by the invention, a near-end driving device is arranged at an ultrasound inner side and is free from electromagnetic interference; and meanwhile, the swinging amplitude of an imaging part that the far end is inserted into a blood vessel can be easily controlled, so that higher safety is guaranteed.

The invention discloses an intrauterine intact lymph node biopsy device, including an inner sheath, an outer sheath tube movably sleeved outside the inner sheath tube and formed with a cavity betweenthe inner sheath tube and the outer sheath tube, and a cutting hook movably sleeved inside the inner sheath tube, wherein an elastic distraction bracket is accommodated in the cavity, the distractionbracket has the tendency of being expanded outward along the inner sheath tube radially, the proximal end of the distraction bracket is fixedly connected with the tube wall of the inner sheath tube, and the distal end of the inner sheath tube is located inside the distraction bracket. In the invention, the use method of the biopsy device based on the guidance of the ultrasound endoscope is also provided, which can complete the complete removal of the lymph nodes outside the digestive tract under the guidance of the ultrasound endoscope, can meet the adequacy of pathological sampling, reduce the trauma to the patient, recover quickly after the operation, and truly achieve the minimally invasive biopsy. In this lymph node dissection method, endoscopic ultrasound was used to evaluate the sensitivity, specificity and accuracy of malignant lymph nodes to improve the sensitivity, specificity and accuracy of diagnosis of metastatic lymph nodes and lymphoma.

The present invention provides an admission passage system which has an operational duct assembly. The duct assembly is configured to provide an admission passage to a target vessel and guide the target vessel for follow-up treatment. The admission passage system comprises an adjustable transmission handle assembly and an admission passage pipe sub assembly which has an operational admission passage duct configured to be transmitted to a target position (such as the duodenum) so as to assist in the treatment of diseases (such as bile duct drainage through endoscopic ultrasonography guided biliary tract drainage (EUS-BD)). The admission passage duct comprises at least a far side section which has an adjustable part along the length direction. The adjustable part is configured to be converted to a preset arc shape so as to provide a direction control for the far end of the duct when guiding the adjustable part to pass through a pulse duct (such as bile duct). The handle assembly comprises other elements which are configured to permit clinicians to control and operate the far end of the admission passage duct.

The invention discloses an endoscopic ultrasonic imaging algorithm based on coding excitation and a coherence coefficient. The algorithm combines the advantages of a coding excitation technology and acoherence coefficient algorithm: through the coding excitation technology, a transmission excitation signal of ultrasonic waves is changed into a sequence coding signal from a traditional single sinepulse signal, and the coding length is increased, so that the average transmission power of the ultrasonic waves is improved, and the signal to noise ratio of an image is improved. Pulse compressionis carried out by utilizing good autocorrelation of a complementary sequence, so that the axial side lobe of imaging is effectively eliminated, and the axial resolution is improved. Finally, through acoherence coefficient adaptive beam forming algorithm, the incoherent energy is artificially reduced, namely the specific gravity of the energy of the noise signal in the whole image, inhibiting Gaussian noise and sidelobe noise in the image, and improving the transverse resolution of the image.

A needle for insertion into a living body along a tortuous path comprises an elongate body extending between a proximal end which, during use, remains external to the body and a distal end which, when in an operative configuration, is positioned adjacent to a target structure within the body, a distal portion of the needle including a lumen extending therethrough to a tissue receiving opening at the distal end, the lumen having an inner diameter of at least 0.035 inches and a bending stiffness no greater than 0.08 Nm².

The method of making a liquid composite and fabrication used in catheter probe endoscopic ultrasound, wherein the composite is made by the mixture of edible powder and water. The fabrication method is to mix the edible powder and water and then stir and heat it to the desired temperature; after cooling, the thick transparent liquid can be used for catheter probe endoscopic ultrasound. Because of the higher viscosity, its speed of flow is slow when it is guided into the human body. Therefore, the dosage of the supply can be greatly reduced, which diminishes the patient's discomfort and side effects. In addition, due to its better suspension, it provides the catheter probe endoscopic ultrasound a more stable medium and better imaging. Overall, it is more applicable and practical than the current mediums being used in catheter probe endoscopic ultrasound.

The invention relates to a foresight 3D endoscopic ultrasound system and an imaging method. The endoscopic ultrasound system comprises a host, a display, an endoscopic catheter and a communicating vessel; the endoscopic catheter comprises an inner catheter and an outer cannula which are arranged in a coaxial and relative rotation manner; the foresight 3D endoscopic ultrasonic system further comprises an ultrasonic transducer arranged at the front end of the inner catheter and an end plate arranged at the front end of the outer cannula; the working face of the ultrasonic transducer faces the end plate and is close to the inner wall of the end plate; stripes are formed on the end plate; and a transmission path of ultrasonic waves, emitted by the ultrasonic transducer, passing through a stripe area changes along with the change of the stripes, and phase delay is formed. According to the invention, through the arrangement of the internal catheter and the outer cannula which rotate relative to each other and the cooperation of the single ultrasonic transducer with the working face facing the stripes, data information of ultrasonic excitation and echo signal receiving is obtained under multiple relative rotation angles, so that a 3D image is accurately reconstructed; and the structure is simple, and the cost is low.

The invention relates to a focused endoscopic ultrasound transducer. The focused endoscopic ultrasound transducer comprises a piezoelectric material, a backing layer, an insulating tube and a metal shell, wherein a lower electrode is arranged on the lower surface of the piezoelectric material, the backing layer is abutted and connected with the lower electrode, the piezoelectric material and the backing layer are embedded into the insulating tube, gaps among the insulating tube, the piezoelectric material and the backing layer are filled with insulating materials, the insulating tube is clamped into an assembly hole in the metal shell, a conducting wire is led from the lower surface of the backing layer, an upper electrode is arranged on the upper surface of the piezoelectric material, theupper electrode is electrically connected with the metal shell, matching layers are respectively arranged on the outer surface of the metal shell and the outer surface of the upper electrode, and theupper surface of the piezoelectric material is concave inwards. According to the technical scheme, a spherical pit is formed in the upper surface of the piezoelectric material, the thickness of the piezoelectric material is continuously changed from the edge to the center, the -6dB frequency bandwidth of the transducer is widened, the transverse focusing can be realized, and the transverse resolution of the transducer is increased.

The invention discloses a method for evaluating a swallowing function through a digital subtraction angiography, and belongs to the technical field of swallowing function evaluation. The method comprises the following steps of: making a preparation before an examination, screening patients who need to receive swallowing video fluorography through a clinical examination, and making a preparation ofa contrast agent; making a preparation of a patient body position, a projection angle of DSA (digital subtraction angiography) equipment and a patient body position surface plate angle; feeding the patient with the contrast agent, carrying out DSA dynamic and static camera shooting, and conducting storage; analyzing a DSA dynamic and static video; and carrying out image evaluation and swallowingfunction evaluation, and finally, providing a swallowing clinical function diagnosis. A DSA technology enters a popularization stage, most general top three hospitals purchase a great quantity of DSAin recent years, and the DSA is mainly used for heart and cerebral vessel and peripheral vessel examinations and interventional therapy. On a premise that multiple departments apply the DSA, cost is lowered, and cost performance is improved. Compared with dynamic examinations (swallowing function examinations), including endoscopes, ultrasound and the like, the DSA is a clinical application blankon an aspect of non-dynamic examinations.