30 results about "Cerebrospinal fluid shunt" patented technology

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.

An improvement for a programmable valve system of the type implanted in a patient and used to divert cerebrospinal fluid (CSF) from an intraventricular space to a terminus such as the peritoneal cavity. Such system includes means for establishing a flow path for the CSF to the terminus, which flow path includes a normally closed valve and means for adjusting the opening pressure of the valve in order to regulate the quantity of CSF diverted. The improvement enables an operator to be apprised of the actual opening pressure setting of the valve. A sensor is implantable at the patient and responds to the actual opening pressure setting, by generating an NIR telemetry signal indicative of the actual setting. This signal is transcutaneously transmitted through the skin of the patient to an external point. The telemetry signal is processed to produce observer intelligible data indicating the opening pressure setting of the valve.

An adjustable resistance valve for a cerebrospinal fluid shunt system includes an actuator for allowing the selection of the resistance to flow of the valve, a device for selecting at least one passage traversing across the valve, and a resistance system. The resistance system includes a set of passages each defining a different resistance to flow. The passages are disposed in a circle facing the selecting device such as to guide the flow of the cerebrospinal fluid traversing the passage of the selecting device through the selected passage of the resistance system. The actuator enables one to change the relative position of the selecting device with respect to the resistance system by a rotational movement to select the desired resistance of the valve.

This invention relates to cerebrospinal fluid shunts, and a method of treating shunt catheters, whereby the interior lumen of a shunt catheter, comprised of a biocompatible matrix, is seeded with cells for placement within cerebrospinal fluid pathways of the central nervous system. The seeded cells have at least one of the following characteristics: (1) they are of a polarized ependymal epithelial phenotype with tight junctional complexes and apical cilia directed toward the lumen of the catheter; (2) they maintain stem / progenitor characteristics and are capable of neurogenesis; (3) they maintain stem / progenitor characteristics and are capable of gliogenesis.

The invention relates to a cerebrospinal fluid shunt flow detection system and method. The cerebrospinal fluid shunt flow detection system comprises a MCU module, a computer connected to the MCU module, a signal processing module and a thermal excitation driving module, the thermal excitation driving module is further connected with a thermal conduction device through a cooling module, and the signal processing module is further connected with a signal acquisition module; the MCU module controls the operation of the cooling module through the thermal excitation driving module, and a thermal excitation signal is transmitted through the thermal conduction device so as to change the temperature of the cerebrospinal fluid at a thermal excitation point; and the signal acquisition module collects a cerebrospinal fluid temperature signal at a sampling point, and the signal processing module performs signal preprocessing and A / D conversion and transmits the processed signal to the MCU module for calculating the cerebrospinal fluid shunt flow and uploading the calculated data to the computer. The cerebrospinal fluid shunt flow detection system is applied to the thermal conduction technologyto detect the cerebrospinal fluid shunt flow for the first time and can simulate the detection of the cerebrospinal fluid shunt flow of patients under any condition. Compared with the existing X-CT and MRI equipment, the cerebrospinal fluid shunt flow detection system has high efficiency and no radiation, and saves money. In addition, the cerebrospinal fluid shunt flow detection system only needsto adopt one sampling point to achieve the detection of the cerebrospinal fluid shunt flow.

A device that can be placed within or near the cranial vault that fluctuates in size in response to changes in CSF pressure is disclosed. The device diminishes in size when CSF pressures rise and increases in size as CSF pressures diminish. The device has the effect of reducing the flow of CSF occurring in the foramen magnum and provides an alternative to craniovertebral decompression in Chiari I patients. The device may have applications in other neurologic illnesses associated with abnormal CSF flow, such as Idiopathic Syringomyelia, Normal Pressure Hydrocephalus, and CSF dural leaks.