30 results about "Ventricular catheters" patented technology

A hydrocephalus shunt having an anti-inflammatory coating applied to at least the outside surface of the ventricular catheter. Such coatings are also applicable to other medical devices or implants.

The invention provides a drainage system that includes a ventricular catheter, a drainage catheter, and a positive displacement pump that can function to actively drain CSF from the ventricles of the brain of a patient. Methods of using a drainage system in accordance with the invention are also provided, as well as kits.

The invention relates to a method for hypothermia and rewarming of the cerebrospinal fluid in the brain. In one embodiment, cooling and rewarming of the cerebrospinal fluid is accomplished by applying cooling and rewarming elements externally placed in contact with the skin overlying the cerebrospinal fluid cisterns at the back of the head and spine regions of a patient. In another embodiment, hypothermia and rewarming is accomplished using a double barrel ventricular catheter placed within the lateral ventricles with one catheter used for heat exchange and the other for drainage of excess cerebrospinal fluid. In yet another embodiment of the invention, hypothermia and rewarming is accomplished using a loop catheter with fluid running through the loop placed in the lateral ventricles.

A cerebrospinal fluid shunt system comprises a brain ventricular catheter for insertion into the brain ventricle so as to drain cerebrospinal fluid from the brain ventricle. The system also comprises a sinus sagittalis catheter for insertion into the sinus sagittalis for feeding the cerebrospinal fluid into sinus sagittalis. A shunt main body is connected at one end thereof to the brain ventricle catheter and at another end thereof to the sinus sagittalis catheter. The shunt main body can provide fluidic communication between the brain ventricle catheter and the sinus sagittalis catheter. The system further comprises a tubular flow passage restricting member defines within the shunt main body. The tubular flow passage restricting member defines a resistance to flow of 8-12 mm Hg / ml / min.

A ventricular catheter includes an external ventricular drainage (EVD) catheter and has at least one conduit formed in the wall of the EVD catheter. The conduit opens at a side port of the wall at an angle to the EVD catheter. The side port is formed in the wall to allow a probe to be extended from the conduit at the angle into brain tissue that is not altered by the insertion of the EVD catheter. The ventricular catheter has an oval shape to minimize the total cross-sectional area while still allowing the necessary number of conduits.

The present invention provides systems and methods for the maintenance of target CSF volumes in the ventricles of a patient's brain. Systems may comprise a mechanism for remote-sensing of CSF volume and / or intra-cranial pressure, a ventricular catheter, a valve and / or pump affixed in the skull and controlled by a microprocessor in response to signals from the sensing device, and an intra-osseous CSF infusion element which may be embedded in the skull near the sagittal suture or at other bone locations, for transport of the CSF removed from the ventricle to the venous system of the brain or elsewhere.

A cerebrospinal fluid (CSF) shunt comprises a ventricular catheter and an electroactive polymer actuated valve for regulating the drainage rate of CSF from the brain ventricle of a patient. The shunt system also comprises a distal catheter for discharge of the CSF to a separate location in the patient's body such as the peritoneal cavity or atrium of the heart. The electroactive polymer actuated valve regulates the flow rate of CSF through a predetermined threshold pressure, which can be adjusted and programmed externally from the patient's body by means of an external control unit signal, as well as through a signal indicated by an internal sensor or an electroactive polymer transducer. The sensor also communicates a signal to the external control unit for indicating the internal pressure at a single location or multiple locations throughout the fully implanted shunt assembly.

A novel ventricular catheter designed to reduce CSF shunt obstruction is disclosed comprising a tip using a membrane without any opening and capable of filtering the CSF. When the CSF flows through the membrane, neither tissue (choroid plexus, blood cells, tumor cells, suctioned ependymal tissue) nor proteins can break through the membrane, making this ventricular catheter capable of preventing obstruction from tissue invasion but also preventing clogging from protein precipitation, coagulation or flocculation along the downstream shunt system.

A shunt includes a housing having an inlet, an outlet and a flow control mechanism disposed within the housing. A ventricular catheter is connected to the inlet of the housing. The catheter has a longitudinal length, a proximal end, a distal end, and an inner lumen extending therethrough. The inner lumen of the catheter includes at least two lumens at the distal end and has only one lumen at the proximal end. The catheter has one slit and aperture corresponding to each of the at least two lumens located at the distal end of the catheter.

The invention belongs to the technical field of auxiliary medical devices, and concretely relates to a device used for preserving a lung under low temperature and ventilated situations during a non-heart-beating-donor (NHBD) lung transplant. The device comprises a medical elastic rubber bag and an outer case, wherein the medical elastic rubber bag is used for placing a complex of the heart and the lung, and is provided with an inlet and an outlet for a low-temperature lung preservation solution, a central fixing support therein and a temperature sensor on an inner wall; the medical elastic rubber bag is arranged in the outer case; mixtures of ice and water are arranged between the outer case and the medical elastic rubber bag and can synergistically maintain the low-temperature state of the medical elastic rubber bag. In addition, two tee pipe joints are provided for respectively connecting the inlet and the outlet of the low-temperature lung preservation solution, left and right ventricular catheters and internal space of the medical elastic rubber bag. The device provided by the invention not only can realize filling and immersing of the low-temperature lung preservation solution, but also can sequentially ventilate in tracheae, thereby combining respective advantages, synergistically confronting warm ischemia injury of NHBD lung, and improving quality of the NHBD lungs.

A skull-mounted drug and pressure sensor (SOS), a smart pump (ISP) electrically coupled to the SOS and a drug delivery and communications catheter communicating the SOS with the ISP are combined for a first embodiment. A skull-mounted (SOS), a metronomic biofeedback pump (MBP) electrically coupled to the SOS and a drug delivery and communications catheter having a sending and receiving optical fiber communicating the SOS with the MBP are combined for a second embodiment. A third embodiment combines a (SOS), an implantable power and communication unit (PCU) electrically coupled to the SOS, and a drug delivery and communications catheter for communicating the SOS with the PCU and for communicating the exterior source of the drug to the SOS. A fourth embodiment combines a ventricular catheter with a CSF accessible chamber and drug delivery port; and an implantable stand-alone skull-mounted drug and pressure sensor (SPS).

A shunt catheter system and method of use thereof. The system generally includes an open-ended ventricular catheter with drainage apertures and safety flap valves, a reservoir with inline filter, and a peritoneal catheter. After insertion, for example into the ventricles of the brain, cerebrospinal fluid would pass into the ventricular catheter, through the inline filter in the reservoir, and into the peritoneal catheter, subsequently exiting the shunt catheter system. During insertion of the ventricular catheter, a catheter stylet or wire / string and plug stylet can be positioned therein to occlude the open end. The ventricular catheter may be positioned perpendicular to the peritoneal catheter and can be coupled to one another through the reservoir and inline filter or valve.

A catheter for positioning a valve during a transcatheter aortic valve replacement is formed from a resilient hollow body conformable to a guide wire when a guide wire is passed in through an upper opening in the hollow body and through the hollow body. When the guide wire is retracted, the catheter deploys to form a substantially straight upper shaft portion that extends downwardly from the upper opening and a distal ring perpendicular to the upper shaft portion. The distal ring approximates the size and shape of the patient's aortic valve annulus. A lower loop connects the upper shaft portion of the catheter to the distal ring. An outer surface of the distal ring is radiopaque, and the distal ring comprises openings for dispersing radio opaque medium used in imaging of the patient's aortic valve annulus. The deployed catheter is advanced until it snugly contacts the aortic valve with the horizontal loop at the level of the aortic valve leaflets and with the lower loop dipping into one the aortic valve cusps. The distal ring will be viewed as a straight line when an x-ray C-arm is properly aligned with the aortic valve.

A cerebrospinal fluid (CSF) shunt comprises a ventricular catheter and an electroactive polymer actuated valve for regulating the drainage rate of CSF from the brain ventricle of a patient. The shunt system also comprises a distal catheter for discharge of the CSF to a separate location in the patient's body such as the peritoneal cavity or atrium of the heart. The electroactive polymer actuated valve regulates the flow rate of CSF through a predetermined threshold pressure, which can be adjusted and programmed externally from the patient's body by means of an external control unit signal, as well as through a signal indicated by an internal sensor or an electroactive polymer transducer. The sensor also communicates a signal to the external control unit for indicating the internal pressure at a single location or multiple locations throughout the fully implanted shunt assembly.

An implantable intracranial pulse pressure modulator for treating hydrocephalus in patients of all ages is disclosed as well as a system and method for use of the same. In one embodiment of the implantable intracranial pulse pressure modulator, two one-way valves are interposed in parallel, opposing orientations between a vestibule and a chamber. One of the one-way valves, in response to systole, provides fluid communication from the vestibule to the chamber such that a small aliquot of cerebrospinal fluid (CSF) is displaced from a cerebral ventricle into a ventricular catheter, thereby reducing intraventricular systolic pressure. The other one-way valve, in response to diastole, provides fluid communication from the chamber to the vestibule such that the same volume of CSF is reintroduced into a cerebral ventricle, thereby increasing intraventricular diastolic pressure. Together, both processes work synergistically to reduce intraventricular pulse pressure in order to treat hydrocephalus.

A hydrocephalus shunt arrangement for draining cerebrospinal fluid (CSF) in a patient includes a ventricle catheter, a first drainage line, a control valve, a second drainage line, and an intracranial device. The ventricle catheter is inserted into a ventricle space of the brain of a patient. The first drainage line is connected to the ventricle catheter. The control valve is connected to the first drainage line and controls the drainage of CSF from the cranium of the patient through the second drainage line into a drainage area inside an abdominal cavity of the patient. The intracranial device is implanted under the skin of the patient in or at the cranium and connected to the ventricle catheter or the control valve. The intracranial device includes a corrugated metal membrane covering a chamber disposed within a rigid housing. The control valve produces a desired, controlled, drainage of excess CSF.

A catheter for positioning a valve during a transcatheter aortic valve replacement is formed from a resilient hollow body conformable to a guide wire when a guide wire is passed in through an upper opening in the hollow body and through the hollow body. When the guide wire is retracted, the catheter deploys to form a substantially straight upper shaft portion that extends downwardly from the upper opening and a distal ring perpendicular to the upper shaft portion. The distal ring approximates the size and shape of the patient's aortic valve annulus. A lower loop connects the upper shaft portion of the catheter to the distal ring. An outer surface of the distal ring is radiopaque, and the distal ring comprises openings for dispersing radio opaque medium used in imaging of the patient's aortic valve annulus. The deployed catheter is retracted until it snugly contacts the aortic valve annulus. The distal ring will be viewed as a straight line when the x-ray C-arm is properly aligned with the aortic valve annulus.