摘要:
Systems, devices, and methods for current control of energy delivery to ablate tissue are disclosed. A generator may include a set of electrode channels coupled to a set of electrodes during use. Each electrode channel from the set of electrode channels may include a first switch from a first set of switches and a second switch from a second set of switches. A set of energy sources may be coupled to a third set of switches. The third set of switches may be configured to switch from an OFF state to an ON state to couple the set of energy sources to the set of electrodes. A set of resistors may be coupled to the second set of switches. The second set of switches may be configured to switch from an OFF state to an ON state to couple the set of resistors to the set of electrodes.
摘要:
Systems and methods for pacing cardiac conductive tissue are described. A medical system includes an electrostimulation circuit to generate His-bundle pacing (HBP) pulses for delivery at or near a His bundle of the heart. A control circuit may time the delivery of the HBP pulses within a tissue refractory period subsequent to an intrinsic His-bundle activation of a first His-bundle portion. Based on an evoked His-bundle activation of a second His-bundle portion, the system may determine whether correction of intra-Hisian block has occurred. The system additionally includes a threshold test circuit to determine an individualized pacing threshold representing minimal energy to excite the His bundle and to correct the cardiac conduction abnormality.
摘要:
Изобретение относится к медицинской технике, а именно к устройствам для временной электрической стимуляции сердечной мышцы. Переходник к деимплантированному кардиостимулятору для временной электрокардиостимуляции, имеет проксимальную часть в виде изоляционного корпуса с уплотнительными кольцами и первым и вторым контактными штырями, и дистальную часть с гибкой изоляционной трубкой, в полости которой размещены первый и второй спиральные токопроводящие провода, причем первый спиральный токопроводящий провод одним своим концом соединен с первым контактным штырем, причем второй спиральный токопроводящий провод одним своим концом соединен со вторым контактным штырем, который коаксиален первому контактному штырю, отличающийся тем, что первый спиральный токоприводящий провод другим своим концом соединен с первым электрическим разъемом типа «банан», предназначенным для подсоединения к отрицательному проксимальному полюсу электрода для временной электрокардиостимуляции, а второй спиральный токоприводящий провод другим своим концом соединен со вторым электрическим разъемом типа «банан», предназначенным для подсоединения к положительному проксимальному полюсу электрода для временной электрокардиостимуляции. Изобретение позволяет изменить функциональные возможности переходника и использовать постоянные имплантируемые электрокардиостимуляторы для временной электрокардиостимуляции без их имплантации пациенту.
摘要:
Systems, apparatus, methods and computer-readable storage media that facilitate monitoring the integrity of telemetry connectivity between an implantable device and an external device are provided. In one embodiment, an implantable device includes a monitoring component that monitors advertisement signal information identifying an amount of advertisement signals transmitted to the external device within a defined time period, and telemetry session information identifying an amount of the telemetry sessions that are established between the external device and the implantable device within the defined time period. A connectivity assessment component of the implantable device further determines whether a telemetry connectivity problem exists between the external device and the implantable device based on a degree of miscorrelation between the advertisement signal information and the telemetry session information.
摘要:
Implantable medical devices such as leadless cardiac pacemakers may include a rechargeable battery, and a receiving antenna for receiving radiative energy from an external transmitter. Energy captured by the receiving antenna of the implantable medical device may be converted into electrical energy that may be used to recharge the rechargeable battery of the implantable medical device. Since the rechargeable battery does not have to initially store sufficient energy to power the implantable medical device over its entire useful life, the battery itself and thus the implanted medical device can be made smaller while still achieving device longevity expectations.
摘要:
본 개시에서는 제 1 면과 제 2 면을 가지는 부도체인 피드스루 기판과; 피드스루 기판의 제 1 면으로 노출된 단자와 단자에 연결되고 피드스루 기판 외부로 노출되지 않는 몸체를 갖는 하나 이상의 제 1 피드스루 전도체; 및, 피드스루 기판의 제 2 면으로 노출된 단자와 단자에 연결되고 피드스루 기판 외부로 노출되지 않는 몸체를 가지며, 제 1 피드스루 전도체 각각과 일대일로 대응되어 쌍을 이루는 하나 이상의 제 2 피드스루 전도체; 를 포함하고, 각각의 제 1 피드스루 전도체의 몸체와 그에 대응되는 제 2 피드스루 전도체의 몸체는 서로 용량성 결합(capacitive coupling) 되도록 배치되는 피드스루 장치를 제공한다.
摘要:
An electrode array configured to be inserted at least partially into a blood vessel including: a self-expandable array body; at least two axially spaced-apart electrodes connected to said array body; wherein at least part of said array body expands to an open conformation and pushes at least one selected electrode against a blood vessel inner tissue with a force designed not to damage venous tissue.
摘要:
An electroactive polymer actuator useful in biomedical applications is disclosed. The electroactive polymer includes a dielectric elastomer film with a metallic mesh embedded therein, and two electrodes, each coating a respective major surface of the film. In some aspects, a cardiac assist device using such an electroactive polymer actuator is disclosed. The cardiac assist device includes a sleeve that substantially surrounds a persons heart and that is electrically insulated from its surroundings. Optionally, the cardiac assist device includes multiple regions connected to a power source in such a way that each region can be activated independently from the others. In other aspects, a method of using such a cardiac assist device to contract a heart is disclosed. A voltage is applied to the metallic mesh and the electrodes are grounded creating respective electric fields between the metallic mesh and each electrode, causing the cardiac assist device to contract.
摘要:
Disclosed herein are novel amine-functionalized porphyrin compounds, as wells as pharmaceutically acceptable salts or esters thereof. The disclosed compounds can be used to impart antioxidant, antiinflammatory, anti-microbial, and/or cell-adhesion specificity to a surface or material in need thereof, such as a surface of an indwelling medical implant, or a marine surface. The porphyrine compounds are characterized by having the following group attached to the porphyrine core through a carboxylate ester group. A is independently an optionally substituted N-heterocyclic aromatic ring; x is independently an integer from 0 to 6; R2 is independently lower aminoalkyl or lower aminoaryl.
摘要:
Disclosed is an implantable medical device and methods of using the medical device. The medical device may include a guided surface wave receive structure configured to receive a guided surface wave transmitted by a guided surface waveguide probe. The guided surface wave receive structure in the medical device generates an alternating current signal when the guided surface wave is received. The medical device includes a power circuit that is coupled to the guided surface wave receive structure. The power circuit includes a power storage circuit to store the power signal. The medical device includes a medical circuit that comprises a stimulus circuit, a monitoring circuit, and potentially other components. The stimulus circuit provides a stimulus to a human body. The monitoring circuit measures a characteristic of the human body.