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VeriQ - Flow

Graft patency is crucial for a successful outcome in all vascular procedures. The VeriQ Flowmeter System is designed for intraoperative blood flow measurements during cardiac, vascular and transplant surgery. It is quick, easy and non-invasive to meet the high requirements of the operating theatre.

Flow measurement with Transit Time is the most accurate and commonly used method for graft patency verification. It provides easy-to-interpret data to assist the surgeon. Blood flow is measured with sterile probes and a real time flow curve is displayed together with Mean Flow in ml/min, Pulsatility Index (PI) and Diastolic Filling percentage (DF%). The system consists of a 19" touch screen and a 160 GB hard drive mounted on a trolley which makes it easy to move between theatres. It is also possible to measure velocity with Doppler, connect a pressure cable to the system for calculation of resistance and to perform Fast Fourier Transformation (FFT) analysis. For epicardial and epiaortic imaging with our latest ultrasound probe, see Imaging.

Why verify graft patency?
• Graft patency verification is crucial in CABG and OPCAB to evaluate the function of the performed bypass grafts.
• Graft patency verification validates the quality of the surgery to the cardiologist, potential lawyers, and quality assurance committee.
• Early detection of graft failure is cost-effective and may prevent hemodynamic instability, postoperative infarction (which may be caused by graft failure), and reduce number of days at ICU and in the hospital.
• Cost effectiveness of intraoperative methods are important, and selection of methods for future treatment will be based on the number of reoperations preformed. Graft patency verification may help reduce the number of reoperations.

Flow Probes
Autoclaveable QuickFit

Now introducing a new version of the Medi-Stim QuickFit probe series that can safely be sterilized in steam autoclaves.

The new series are available in sizes 1.5mm, 2mm, 3mm, 4mm and 5mm covering vessel diameters from 1.5mm to 6mm.
Using only heat resistant materials, the new probe series can also be cleaned in automatic washing machines. The probes are validated for 134? steam (”prion cycle”) and can be re-sterilized 30 times.
Fast Turnaround
Faster turnaround time for steam autoclaveable probes will ease the logistic handling of the probes and help to reduce the required stock of probes.
Differentiated by colored handle
Steam autoclaveable probes are easily differentiated by the light blue color of the handle. The colored ring and the label printed on the handle identifies the individual probes.

Quickfit

The QuickFit series of MediStim's transit-time probes is available in sizes 1.5mm, 2.0mm, 3.0mm, 4.0mm, and 5.0 mm - all with handle and differentiated by color-coding.

The ergonomic handle and the malleable neck allow for easy access, facilitating quick application of the probe onto the graft. The soft silicone-ears will keep the probe in position and the flat front face ensures optimal acoustical contact - avoiding air being entrapped between the vessel wall and the probe. This superior acoustical contact is validated on the screen through an indicator. The smooth and seamless probe surface is easy to clean and sterilize.

Doppler probes

The X-Plore probe is used on the surface of the heart/vessel to search for intramural coronary arteries or to locate the position and quantify the degree of a stenosis.

Velocity measurement on the beating heart is challenging with muscle contraction causing movements detected by the Doppler. Using the new X-Plore stabilizer, the probe head can be fixed to the surface omitting the need for an external mechanical stabilizer to immobilize the heart surface. The stabilized probe is held in position with a small layer of sterile ultrasound gel inside the stabilizer cup. The use of gel instead of the commonly used vacuum, ensures minimal influence on the native coronary flow and also allows the probe to be repositioned simply by sliding it across the surface.
The Doppler X-Plore can also be used with a removable handle when a mechanical stabilizer is available or when measuring on a stable surface. The small probe head can be used with forceps for increased access or during endoscopic procedures.
The doppler X-plore probe transmits an ultrasound wave burst of a known frequency and length. Moving objects will reflect some of the ultrasound energy back to the probe. Objects moving towards the probe will compress the wavelength and objects moving away from the probe will increase the wavelength. The change in frequency can be detected by comparing the received signals with the transmitted signal. The changed frequency (Doppler shift) represents the velocity and direction of the reflecting object. VeriQ applies a pulsed Doppler, allowing the user to control the depth at which the velocities should be measured, and the sample volume, where the length is also adjustable.