Experience with an intracranial pressure transducer readjustable in vivo

1974 ◽  
Vol 40 (2) ◽  
pp. 272-276 ◽  
Author(s):  
Wolfgang Gobiet ◽  
Wolfgang Joachim Bock ◽  
Jürgen Liesegang ◽  
Wilhelm Grote
Keyword(s):  
Intracranial Pressure ◽  
Pressure Transducer ◽  
Fluid Pressure ◽  
Zero Point ◽  
Epidural Pressure ◽  
Content Type ◽  
Ventricular Fluid Pressure ◽  
Term Monitoring

✓ A new implantable miniature intracranial pressure transducer is described whose main advantage is the possibility of zero point calibration in vivo. Comparative studies verify that epidural pressure corresponds well with ventricular fluid pressure. During long-term monitoring of 30 patients the transducer proved both safe and reliable.

A clinical comparison of subdural screw pressure measurements with ventricular pressure

1983 ◽  
Vol 58 (1) ◽  
pp. 45-50 ◽  
Author(s):  
A. David Mendelow ◽  
John O. Rowan ◽  
Lilian Murray ◽  
Audrey E. Kerr
Keyword(s):  
Head Injury ◽  
Intracranial Pressure ◽  
Severe Head Injury ◽  
Fluid Pressure ◽  
Ventricular Catheter ◽  
Pressure Measurements ◽  
Content Type ◽  
Single Lumen ◽  
Ventricular Fluid Pressure ◽  
Fine Print

✓ Simultaneous recordings of intracranial pressure (ICP) from a single-lumen subdural screw and a ventricular catheter were compared in 10 patients with severe head injury. Forty-one percent of the readings corresponded within the same 10 mm Hg ranges, while 13% of the screw pressure measurements were higher and 46% were lower than the associated ventricular catheter measurements. In 10 other patients, also with severe head injury, pressure measurements obtained with the Leeds-type screw were similarly compared with ventricular fluid pressure. Fifty-eight percent of the dual pressure readings corresponded, while 15% of the screw measurements were higher and 27% were lower than the ventricular fluid pressure, within 10-mm Hg ranges. It is concluded that subdural screws may give unreliable results, particularly by underestimating the occurrence of high ICP.

Effects of intravenous nitroglycerin on the intracranial pressure and volume pressure response

1983 ◽  
Vol 58 (4) ◽  
pp. 562-565 ◽  
Author(s):  
Ghaleb A. Ghani ◽  
Yung Fong Sung ◽  
Michael S. Weinstein ◽  
George T. Tindall ◽  
Alan S. Fleischer
Keyword(s):  
Blood Pressure ◽  
Intracranial Pressure ◽  
Fluid Pressure ◽  
Pressure Response ◽  
Mean Blood Pressure ◽  
Intravenous Nitroglycerin ◽  
Content Type ◽  
Ventricular Fluid Pressure ◽  
The Mean ◽  
Fine Print

✓ Ventricular fluid pressure (VFP) and volume-pressure response were measured during nitroglycerin (NTG) infusion in nine patients anesthetized with N2O and fentanyl. The patients' ventilation was controlled, and PaCO2 was kept at 32 ± 4 mm Hg. When an infusion of 0.01% NTG was given intravenously to decrease the mean blood pressure to 95.1%, 84.7%, and 78.2% of control, the VFP increased from control levels of 9.94 ± 2.14 mm Hg to 12.89 ± 2.25, 15.6 ± 2.85, and 14.43 ± 3.45 mm Hg, respectively. The volume-pressure response showed a significant increase when blood pressure decreased to 84.7% and 78.2% of control. These results suggest that intravenous NTG caused an increase in the intracranial pressure and a decrease in the intracranial compliance.

Long-term testing of an intracranial pressure monitoring device

2000 ◽  
Vol 93 (5) ◽  
pp. 852-858 ◽  
Author(s):  
Jeffrey S. Kroin ◽  
Robert J. McCarthy ◽  
Lee Stylos ◽  
Keith Miesel ◽  
Anthony D. Ivankovich ◽  
...  
Keyword(s):  
Intracranial Pressure ◽  
Pressure Sensors ◽  
Tissue Reaction ◽  
Capacitive Transducer ◽  
Content Type ◽  
Csf Pressure ◽  
Long Term Monitoring ◽  
Term Monitoring ◽  
Fine Print

Object. Long-term monitoring of intracranial pressure (ICP) is limited by the lack of an implantable sensor with low drift. The goal of this study was to demonstrate that a new capacitive transducer system will produce accurate and stable ICP records over extended periods.Methods. Intracranial pressure sensors were implanted into the frontal white matter of four dogs. In addition, a fluid-filled catheter was placed in the cisterna magna (CM) to measure cerebrospinal fluid (CSF) pressure. The animals were tested using standard physiological maneuvers such as jugular vein compression, head elevation, and CSF withdrawal from and saline injection into the CM to verify that the ICP sensor precisely matched CSF pressure changes. The mean ICP pressure and CM pressure were compared for months to demonstrate that the transducer system produced minimal drift over time.The change in the ICP sensor record closely duplicated that of the CSF waveform in the CM in response to well-known physiological stimuli. More important, mean ICP pressure remained within 3 mm Hg of CM pressure for months, with a mean difference of less than 0.3 mm Hg. Histological examination of the dog brains revealed only minimal tissue reaction to the presence of the sensor.Conclusions. The authors demonstrate a new implantable solid-state sensor that reliably measures ICP for months, with minimal drift. The clinical application of this sensor and its telemetry is for long-term monitoring of patients with head injury, mass lesions, and hydrocephalus.

Disposable system for intraventricular pressure measurement and CSF drainage

1972 ◽  
Vol 36 (6) ◽  
pp. 798-801 ◽  
Author(s):  
Harvey M. Shapiro ◽  
S. R. Wyte ◽  
A. B. Harris ◽  
A. Galindo
Keyword(s):  
Pressure Transducer ◽  
Fluid Pressure ◽  
Drainage System ◽  
Intraventricular Pressure ◽  
Content Type ◽  
Csf Drainage ◽  
Continuous Record ◽  
Adjustable Mechanism ◽  
Standard Pressure ◽  
Ventricular Fluid Pressure

✓ A simple disposable system for controlled cerebrospinal fluid drainage and monitoring of ventricular fluid pressure is described. The unit is connected between the patient's external ventriculostomy and a standard pressure transducer. This drainage system is easily assembled, incorporates an adjustable mechanism for releasing pressure, provides a continuous record of ventricular fluid pressure, and permits hourly measurement of CSF drainage. The pressure recording is continued even when the ventricular fluid pressure falls below a predetermined maximal value.

Use of long-term intracranial pressure measurement to assess hydrocephalic patients prior to shunt surgery

1975 ◽  
Vol 42 (3) ◽  
pp. 258-273 ◽  
Author(s):  
Lindsay Symon ◽  
Nicholas W. C. Dorsch
Keyword(s):  
Intracranial Pressure ◽  
Pressure Measurement ◽  
Pressure Profile ◽  
Shunt Surgery ◽  
Raised Intracranial Pressure ◽  
Epidural Pressure ◽  
Content Type ◽  
Pressure Recording ◽  
Fine Print

✓ The authors present their experience with long-term epidural pressure recording in hydrocephalic patients. The technique identifies those with episodically raised intracranial pressure. The effect of shunts on the pressure profile in these patients is described.

scholarly journals Comparative investigation of different telemetric methods for measuring intracranial pressure: a prospective pilot study

2020 ◽  
Author(s):  
Sergej Rot ◽  
Mamon Dweek ◽  
Pawel Gutowski ◽  
Leonie Goelz ◽  
Ullrich Meier ◽  
...  
Keyword(s):  
Pilot Study ◽  
Intracranial Pressure ◽  
Comparative Investigation ◽  
Implantation Time ◽  
Prospective Pilot Study ◽  
Ventricular Hemorrhage ◽  
Technical Features ◽  
Term Monitoring

Abstract Objectives: Measurement of intracranial pressure (ICP) plays an important role in long-term monitoring and neuro-intensive treatment of patients with a cerebral shunt. Currently, only two complete telemetric implants with different technical features are available worldwide. This prospective pilot study aims to examine patients who had both probes implanted at overlapping times for clinical reasons and represents the first in vivo comparison of both measurement methods. Materials and methods: Patients with a primary subarachnoid hemorrhage or a spontaneous intracerebral hemorrhage with ventricular hemorrhage who had received a telemetric ICP probe (Raumedic ® NEUROVENT ® -P-tel) were included in the study. Conventional external ventricular drainages (EVD) and ventriculoperitoneal shunts with a telemetric ICP probe (Miethke Sensor Reservoir) were implanted in patients with hydrocephalus who required CSF (cerebrospinal fluid) drainage. ICP values from all systems were obtained. Due to the overlapping implantation time, parallel ICP measurements were performed via two devices simultaneously. ICP measurements via the sensor reservoir were repeated after three, six and twelve months. Differences between the ICP values measured via the NEUROVENT ® -P-tel probe, the Miethke sensor reservoir ® , and the EVD were analyzed. Results: Sixteen patients were included in the present study between 2016 and 2018. 63% of all patients were male. In 11 patients the ICP measurements were followed up with both devices for 3 months. ICP measurements of the sensor reservoirs showed corresponding trends in 9 cases compared to ICP measurement via the telemetry probe or EVD. Difference in ICP values ranged between 14.5 mmHg and 0.0 mmHg. The average difference of the ICP values in 8 cases was ≤ 3.5 mmHg. Conclusion: ICP measurements with both systems continuously showed synchronous ICP values, however absolute values of ICP measurement with the different systems did not match.

scholarly journals Comparative Investigation of Different Telemetric Methods for Measuring Intracranial Pressure: A Prospective Pilot Study

2020 ◽  
Author(s):  
Sergej Rot ◽  
Mamon Dweek ◽  
Pawel Gutowski ◽  
Leonie Goelz ◽  
Ullrich Meier ◽  
...  
Keyword(s):  
Pilot Study ◽  
Intracranial Pressure ◽  
Comparative Investigation ◽  
Implantation Time ◽  
Prospective Pilot Study ◽  
Ventricular Hemorrhage ◽  
Technical Features ◽  
Term Monitoring

Abstract Objectives: Measurement of intracranial pressure (ICP) plays an important role in long-term monitoring and neuro-intensive treatment of patients with a cerebral shunt. Currently, only two complete telemetric implants with different technical features are available worldwide. This prospective pilot study aims to examine patients who had both probes implanted at overlapping times for clinical reasons and represents the first in vivo comparison of both measurement methods. Materials and methods: Patients with a primary subarachnoid hemorrhage or a spontaneous intracerebral hemorrhage with ventricular hemorrhage who had received a telemetric ICP probe (Raumedic® NEUROVENT®-P-tel) were included in the study. Conventional external ventricular drainages (EVD) and ventriculoperitoneal shunts with a telemetric ICP probe (Miethke Sensor Reservoir) were implanted in patients with hydrocephalus who required CSF (cerebrospinal fluid) drainage. ICP values from all systems were obtained. Due to the overlapping implantation time, parallel ICP measurements were performed via two devices simultaneously. ICP measurements via the sensor reservoir were repeated after three, six and twelve months. Differences between the ICP values measured via the NEUROVENT®-P-tel probe, the Miethke sensor reservoir®, and the EVD were analyzed. Results: Sixteen patients were included in the present study between 2016 and 2018. 63% of all patients were male. In 11 patients the ICP measurements were followed up with both devices for 3 months. ICP measurements of the sensor reservoirs showed corresponding trends in 9 cases compared to ICP measurement via the telemetry probe or EVD. Difference in ICP values ranged between 14.5 mmHg and 0.0 mmHg. The average difference of the ICP values in 8 cases was ≤ 3.5 mmHg. Conclusion: ICP measurements with both systems continuously showed synchronous ICP values, however absolute values of ICP measurement with the different systems did not match.

scholarly journals Comparative investigation of different telemetric methods for measuring intracranial pressure: a prospective pilot study

2020 ◽  
Author(s):  
Sergej Rot ◽  
Mamon Dweek ◽  
Pawel Gutowski ◽  
Leonie Goelz ◽  
Ullrich Meier ◽  
...  
Keyword(s):  
Pilot Study ◽  
Intracranial Pressure ◽  
Comparative Investigation ◽  
Implantation Time ◽  
Prospective Pilot Study ◽  
Ventricular Hemorrhage ◽  
Technical Features ◽  
Term Monitoring

Abstract Objectives: Measurement of intracranial pressure (ICP) plays an important role in long-term monitoring and neuro-intensive treatment of patients with a cerebral shunt. Currently, only two complete telemetric implants with different technical features are available worldwide. This prospective pilot study aims to examine patients who had both probes implanted at overlapping times for clinical reasons and represents the first in vivo comparison of both measurement methods.Materials and methods: Patients with a primary subarachnoid hemorrhage or a spontaneous intracerebral hemorrhage with ventricular hemorrhage who had received a telemetric ICP probe (Raumedic® NEUROVENT®-P-tel) were included in the study. Conventional external ventricular drainages (EVD) and ventriculoperitoneal shunts with a telemetric ICP probe (Miethke Sensor Reservoir) were implanted in patients with hydrocephalus who required CSF (cerebrospinal fluid) drainage. ICP values from all systems were obtained. Due to the overlapping implantation time, parallel ICP measurements were performed via two devices simultaneously. ICP measurements via the sensor reservoir were repeated after three, six and twelve months. Differences between the ICP values measured via the NEUROVENT®-P-tel probe, the Miethke sensor reservoir®, and the EVD were analyzed.Results: Sixteen patients were included in the present study between 2016 and 2018. 63% of all patients were male. In 11 patients the ICP measurements were followed up with both devices for 3 months. ICP measurements of the sensor reservoirs showed corresponding trends in 9 cases compared to ICP measurement via the telemetry probe or EVD. Difference in ICP values ranged between 14,5 mmHg and 0,0 mmHg. The average difference of the ICP values in 8 cases was ≤ 3,5 mmHg.Conclusion: ICP measurements with both systems continuously showed synchronous ICP values, however absolute values of ICP measurement with the different systems did not match.

A pressure-balanced radio-telemetry system for the measurement of intracranial pressure

1977 ◽  
Vol 47 (6) ◽  
pp. 899-911 ◽  
Author(s):  
Nicholas T. Zervas ◽  
Eric R. Cosman ◽  
Bernard J. Cosman
Keyword(s):  
Intracranial Pressure ◽  
Radio Telemetry ◽  
Zero Point ◽  
External Pressure ◽  
The Body ◽  
Resonant Circuit ◽  
Temperature Drift ◽  
Content Type ◽  
Fast Dynamic

✓ A fully implantable radio-telemetric differential intracranial pressure sensor is described with a zero-point calibration that can be confirmed repeatedly. Intracranial pressure (ICP) is measured with the device by the principle of applying a known external pressure to the scalp above the sensor and simultaneously detecting by radiotelemetry the zero-point of the sensor corresponding to a balance of pressures across it. The radio-telemetry is implemented by a resonant circuit in the sensor of which the resonant radiofrequency is detected outside the body. The sensor is passive, has built-in barometric compensation, negligible permeability or temperature drift, no calibration ambiguities, and fast dynamic response. The implanted sensor has been used successfully for short-term as well as long-term ICP monitoring. It has been implemented primarily for intermittent ICP measurements, but also adapted to continuous recording. Preliminary clinical experience with the system indicates that it is effective, safe, and simple to operate.

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