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Ascension 3D Guidance medSAFE
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medSAFE is our pulsed-DC magnetic tracker for surgical navigation. It tracks the instant position and orientation of micro-miniaturized sensors for intrabody navigation, measurement, and localization. Unique in the world, it features a transmitter design that overcomes the distorting effects of ferrous metals found in OR and procedural tables.     Online:
    'theblurb' is the promotional marketing literature provided for this product.

About 3D Guidance medSAFE
medSAFE is our pulsed-DC magnetic tracker for surgical navigation. It tracks the instant position and orientation of micro-miniaturized sensors for intrabody navigation, measurement, and localization. Unique in the world, it features a transmitter design that overcomes the distorting effects of ferrous metals found in OR and procedural tables. Measurements are also immune to distortion from common hospital metals, such as 300- series stainless steel, titanium and aluminum. Sensors are priced for low cost disposability for high volume applications. medSAFE is customizable to meet myriad procedural requirements.

Key Benefis
• Low cost sensors for localizing disposable catheters and devices in three dimensions
• Sensors ranging from 8 mm to 0.9 mm diameter for unobtrusive instrument guidance.
• 3rd generation magnetic technology to over-come environmental limits of earlier AC and DC trackers.
• Precise tracking without line-of-sight restric-tions or radiation.
• Freedom to track sensors without distortion of measurements from ferrous metals beneath our flat transmitter.
• Simultaneous tracking of multiple sensors for gating, referencing and navigating devices.
• Compliant with medical safety standards.

QuicK Facts: 3D Guidance IS……
• Designed for high volume procedures.
• Backed by a design team with 100+ years experience making trackers work in all kinds of environments
• Fully integrated with medical visualization and rendering software.
• Winner of an R&D 100 new product of the year and Frost & Sullivan innovation awards.

• Track up to eight miniaturized 6DOF sensors simultaneously.
• Localize catheter, probes and scopes with low cost sensors.
• Navigate in 3D without ionizing radiation.
• Guide tools without line-of-sight restrictions.
• Medically compliant, Class 1, Type CF, DeFib Proof.

Sensor Options
Model 90 (0.9 mm OD)
Model 130 (1.5 mm OD)
Model 180 (2.0 mm OD)
Model 800 (8.0 mm OD)

Transmitter Options
Short-Range Transmitter
Mid-Range Transmitter
Flat Transmitter

Guide Medical Instruments with Passive DC Magnetic Sensors
• Track multiple miniaturized sensors simultaneously.
• Localize in 3D without ionizing radiation.
• Guide flexible tools without line-of-sight restrictions.
• No “power-line” noise interference.
• Navigate catheters, probes, and scopes with low cost, disposable sensors.

medSAFE’s miniaturized sensors are routinely deployed in medical instruments and catheters for safer and less intrusive tracking and localization. Here a 1.3 mm sensor is seen protruding from the working channel of a bronchoscope. Sensors with sub-millimeter diameters are available to extend the reach of catheters and scopes deep into the periphery of organs and vessels.

Feature benefit
Metal tolerant

80% less distortion due to non-magnetic conductive metals compared to AC magnetic trackers. Outputs unaffected by composite materials. Capable of driving errors induced by highly conductive metals (such as aluminum) to zero by adjusting measurement rate.

Advanced new magnetic technology and signal processing
Flat transmitter with ferrous metal shield negates distortions produced by procedural tables. Outputs immune to “power-line” noise sources.

Occlusion and drift free
Accuracy of measurements unaffected by insertion of sensors into human body.

Low cost sensors
Designed for disposability in volume applications.

Software support
XP/Pro and XP embedded compatible with SDK and sample programs. API with expert support facilitates incorporation into user applications. Fully integrated with partners’ medical imaging software for 3D rendering and visualization of anatomical structures.

    'thefacts' is the simple factual description of the product provided for you by our technical experts.

Ascension 3D Guidance medSAFE

    Detailed product specifications.
Spec Ascension 3D Guidance medSAFE
Technical Model 90 (0.9 mm), Model 130 (1.5 mm),
Model 180 (2.0 mm), Model 800 (8.0 mm)
Degrees of Freedom 6 (Position and Orientation)
Update Rate • Short & Mid-Range Transmitter
up to 375 updates/second for each sensor
• 6DOF Flat (Metal-Immune) Transmitter
up to 162 updates/second for each sensor
Translation Range  
MODEL 90 SENSOR Mid-Range Transmitter: 36 cm (14 inches) in any direction
MODEL 130 SENSOR • Mid-Range Transmitter: 46 cm (18 inches) in any direction
• Short-Range Transmitter: Contact Ascension for latest
test results.
• Flat Transmitter: 46 cm (18 inches) in Z direction
MODEL 180 SENSOR • Mid-Range Transmitter: 58 cm (23 inches) in any direction
• Short-Range Transmitter: Contact Ascension
for latest test results.
• Flat Transmitter: 46 cm (13 inches) in Z direction
MODEL 800 SENSOR • Mid-Range Transmitter: 78 cm (31 inches) in any direction
• Short-Range Transmitter: 46 cm (18 inches) in any
• Flat Transmitter: 46 cm (18 inches) in Z direction
Angular Range All Attitude All Attitude: ± 180° Azimuth & Roll; ± 90° Elevation
Outputs X, Y, Z positional coordinates, orientation angles,
orientation matrix, or quaternions
Electronics Unit 27.9 cm (11 inches) x 27.3 cm (10.7 inches)
x 6.4 cm (2.5 inches)
Transmitters 3 Options Short-Range (6.27 cm x 4.6 cm x 5.2 cm with
6.6 m cable); Mid-Range (9.6 cm cube with 6.6 m cable)
Passive Sensors  
MODEL 90 0.9 mm (0.04 inch) x 7.25 mm (0.29 inch)
with 2.0 m (6.6 ft) cable
MODEL 130 1.5 mm (0.05 inch) x 7.7 mm (0.30 inch)
with 2.0 m (6.6 ft) cable
MODEL 180 2.0 mm (0.07 inch) x 9.9 mm (0.38 inch)
with 2.0 m (6.6 ft) cable
MODEL 800 8.0 mm (.31 inch) x 20.0 mm (0.78 inch)
with 2.0 m (6.6 ft) cable
Power 100-240V ~ 50/60Hz
Operating Temperature 15°C to 35°C; 95% non-condensing humidity
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Model USD
Ascension 3D Guidance medSAFE Price on
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q. What factors are driving the growth of minimally invasive procedures?
a. 1. Fewer traumas to patients due to smaller incisions with less pain and faster recoveries.
2. Reduced procedure time, hospital stays/cost.
3. More precise and optimized delivery of treat-ment supporting improved outcomes.
4. Lower benefit payouts by private and gov-ernment insurers.
5. Competition among hospitals to provide new-est and less costly procedures.
q. what is the advantage of magnetic tracking over current methods of localization?

a.Despite the phenomenal growth potential of minimally invasive procedures, one critical re-straint has always been limited 3D visualization within the patient. X-ray/fluoroscopy permits 2D Vision, but must be used discriminately to minimize health risks to both patient and clini-cian.
A real-time, miniaturized magnetic sensor, on the other hand, solves key issues of real-time imaging, reduction in ionizing radiation, and procedural Vision.
Magnetic tracking lets a physician view 3D imagery that corresponds precisely to patient 3D anatomy. This in turn enhances the physician’s view by providing depth perception and over-coming foreshortening effects. Since, the human body does not attenuate magnetic tracker signals, a clear “line of sight” need not be maintained for continuous tracking. Once inserted in a catheter, hollow needle or scope, the sensor’s outputs function as a 3D reference point that can be superimposed on pre-acquired or real-time images (CT, MRI, US) of anatomical features. This co-registration of instrument tip location with internal anatomy, allows clinicians to precisely map and locate features, to navigate to pre-identified locations, and to deliver therapies to targets. Of growing importance is the fact that magnetic localization reduces reliance on ionizing radiation and contrasting agents.

q. How does magnetic work?

a. Both AC and DC magnetic tracking technologies use a small transmitter to create magnetic fields that induce instant measurable changes in one or more sensors. These changes are processed by an electronics unit to compute and output spatial measurements of position and orientation.
q. How does DC magnetic tracking differ from AC tracking technology?
a. AC trackers work accurately when there are no electrically conductive metals, such as stainless steel, copper, aluminum etc, or ferrous metals are located near the transmitter or sensor. In the presence of these metals, the transmitted AC signal induces eddy currents in the metals. It, in turn, generates a secondary magnetic field that distorts the transmitter’s signal and sensor measurements.
Ascension’s proprietary DC approach significantly reduces the conductive metal distortion problem by taking advantage of the steady state of pulsed DC magnetic fields. The system reduces field distortions by waiting long enough, i.e. about 2.5 mS, for eddy currents to decay substantially before measuring the steady state component of the transmitted field. As a result, eddy currents are, for the most part, mitigated as a source of measurement error.
q. What are some of the key advantages DC technology over earlier AC tracking magnetic technologies?
a. 1. Avoidance of numerous errors, difficult or impossible to fully correct with AC systems. These errors are related to sensor cross coupling, cable impedance, component matching, and conductive metals in the en-vironment.
2.Inherently insensitive to medical type metals such as 300-series stainless steel and tita-nium, even when operating at a high meas-urement rate. AC trackers exhibit large po-sition errors when near these metals.
3.Capability to drive other conductive metal errors to zero by measurement rate reduc-tion. In an AC based system, the eddy cur-rent error is reduced slightly with decreased operating frequency.
4.Insensitivity to cable and signal conditioner bandwidth issues, critical factors in designing small sensors and cable geometries.
5.Freedom from distortion in the presence of composite materials.
6.Immunity to ferromagnetic distortion from metal in an OR table that is beneath our flat transmitter.
q. How does the flat transmitter negate steel and iron alloy distortion from or beds and procedural tables?
a.Accurate tracking of sensors above a metal OR table has always been the Holy Grail of mag-netic tracking.
Conventional AC trackers require that the area immediately around its transmitter be free from distorting objects. Because it is often im-possible to identify underlying metal structures, tracker performance is often unknowingly com-promised. This is especially true of OR tables and beds with structural supports made from ferrous metals, such as carbon steel and iron alloys. To overcome this problem, some AC trackers now specify use of a special, non-mag-netic table for their procedures.
medSAFE’s flat transmitter with a metal-isolating barrier negates the effects of metal below its planar Surface. It fully shields the transmitted magnetic field from metallic compo-nents (distorters) below while “reflecting” clean fields into the hemisphere above. Its unobtrusive, low profile design makes it an ideal choice in a wide variety of procedures even as it overcomes the requirement to modifying existing equipment.
q. Can sensors be used to track ultra-thin guide wires?
a. Yes, medSAFE can be configured to track sensors as small as 0.3 mm in diameter.
q. Does the use of Ascension's DC magnetic tracking pose a health risk?
a. The strength of medSAFE's magnetic fields is extremely small - about the size of the earth's magnetic field. As such, it is not harmful to patients or clinicians. In the 35 years that magnetic tracking devices have been in use, there have been no reports of adverse effects.
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