An implantable medical device system receives a cardiac electrical signal produced by a patient's heart and comprising atrial P-waves and delivers a His bundle pacing pulse to the patient's heart via a His pacing electrode vector. The system determines a timing of a sensed atrial P-wave relative to the His bundle pacing pulse and determines a type of capture of the His bundle pacing pulse in response to the determined timing of the atrial P-wave.

A cardiac defibrillation system. The system comprising a housing and an implantable lead. The implantable lead comprising two ends, including a first end connected to the housing and a second end being a free end. The implantable lead also comprising a defibrillation electrode and at least three detection electrodes including a first detection electrode, a second detection electrode, and a third detection electrode. The first detection electrode and the second detection electrode forming a first dipole. The third detection electrode and the first detection electrode, or, the third detection electrode and the second detection electrode, or, the housing and one of said detection electrodes, forming a second dipole, where a length of the first dipole is between 5 and 50 millimeters and a length of the second dipole is between 50 and 400 millimeters.

A subcutaneously implantable device is implantable into a body of a patient, and includes a prong and an electrode. The prong has a contact portion at or adjacent to a distal end thereof that is configured to contact an organ. The prong is constructed to apply pressure to the organ with spring action so as to maintain contact between the contact portion and the organ without fixing the contact portion to the organ. The electrode is provided at the contact portion of the prong, is configured to contact the organ, and is electrically coupled or couplable with circuitry that is configured to provide monitoring, therapeutic, and/or diagnostic capabilities with respect to the organ.

A method for producing a head part of an implantable medical device is described, with a head part housing, which has a recess in the form of a blind hole, along which at least one electrically conducting contact ring element, together with an electrically insulating, elastically deformable sealing ring, are joined together in a force fit in a coaxial arrangement and an axial serial sequence under an axial joining force. The method is characterized in that the generation of the joining force between the at least one contact ring element and the sealing ring is executed along the assembly tool by use of means of attachment fitted on both sides of the at least one contact ring element and the sealing ring along the assembly tool, of which at least one means of attachment is axially movably and detachably fixed in an axially secure manner to the assembly tool.

Medical devices are provided, comprising a medical device and a sensor.

A chemical etch is performed on a sheet of material. An electrochemical etch is performed on the sheet of material after the chemical etch is performed on the sheet of material. A capacitor is fabricated such that an electrode included in the capacitor includes material from the sheet of material after the electrochemical etch was performed on the sheet of material. In some instances, the chemical etch included at least partially immersing the sheet of material in an etch bath that includes molybdenum. Additionally or alternately, the chemical etch can be performed for a period of time less than 60 s.

A hermetically sealed feedthrough assembly for an active implantable medical device having an oxide-resistant electrical attachment for connection to an EMI filter, an EMI filter circuit board, an AIMD circuit board, or AIMD electronics. The oxide-resistant electrical attachment, including an oxide-resistant sputter layer 165 is disposed on the device side surface of the hermetic seal ferrule over which an ECA stripe is provided. The ECA stripe may comprise one of a thermal-setting electrically conductive adhesive, an electrically conductive polymer, an electrically conductive epoxy, an electrically conductive silicone, an electrically conductive polyimides, or an electrically conductive polyimide, such as those manufactured by Ablestick Corporation. The oxide-free electrical attachment between the ECA stripe and the filter or AIMD circuits may comprise one of gold, platinum, palladium, silver, iridium, rhenium, rhodium, tantalum, tungsten, niobium, zirconium, vanadium, and combinations or alloys thereof.

In some examples, determining a heart failure status includes using an implantable medical device configured for subcutaneous implantation and comprising a plurality of electrodes and an optical sensor. Processing circuitry of a system comprising the device may determine, for a patient, a current tissue oxygen saturation value based on a signal received from the at least one optical sensor, a current tissue impedance value based on a subcutaneous tissue impedance signal received from the electrodes, and a current pulse transit time value based on a cardiac electrogram signal received from the electrodes and at least one of the signal received from the optical sensor and the subcutaneous tissue impedance signal. The processing circuitry may further compare the current tissue oxygen saturation value, current tissue impedance value, and current pulse transit time value to corresponding baseline values, and determine the heart failure status of the patient based on the comparison.

An example system includes memory configured to store a plurality of lead impedances (LeadZs) and processing circuitry communicatively coupled to the memory. The processing circuitry is configured to determine a first sensed LeadZ, and determine a second sensed LeadZ. The processing circuitry is configured to determine a first difference between the first sensed LeadZ and the second sensed LeadZ, and determine a parameter based at least in part on the first difference. The first sensed LeadZ and the second sensed LeadZ are sensed during a same first cardiac cycle or adjacent cardiac cycles of a heart that is receiving pacing.

A medical device system determines first values associated with a first plurality of patient parameters associated with arrhythmic substrate and/or physiological triggers for acute cardiac events based on a first one or more of the physiological signals generated during the period and determines, based on the first values associated with the first plurality of patient parameters, whether to assess alterations in cardiac cellular electrophysiology and/or mechanical alterations of the patient. The system may, in response to determining to assess the alterations in cardiac cellular electrophysiology, determine second values associated with a second plurality of patient parameters relating to cardiac electrophysiology based on a second one or more of the physiological signals generated during the period and determine whether to generate an alert indicating that an acute cardiac event of the patient is predicted based at least in part on the second values associated with the second plurality of patient parameters.