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The VASOSHIELD Pressure Controlling Syringe helps protect vessels from overdistension and potential endothelial damage during standard surgical preparation steps. It works by limiting the internal "flushing" pressure when harvested grafts are irrigated in preparation for use in coronary artery bypass graft (CABG) surgery.

Avoiding excessive pressure and limiting distension helps to maintain internal vessel integrity, which has been demonstrated to be an important factor affecting conduit quality and long-term graft patency.

Vessel flushing with uncontrolled pressure can result in injury to the endothelial lining of the conduit1,2. Maintaining endothelial integrity preserves functions that enable vessels to maintain blood flow and resist occlusion3,4.

Now harvesters and surgeons can have consistent control over vessel distension—at any stage of the preparation process. Designed specifically to deliver the benefits of vessel flushing while controlling pressure, the VASOSHIELD Pressure Controlling Syringe effectively minimizes the risk of overdistension.

[1] Manchio JF, Gu J, Romar L, et al. Disruption of graft endothelium correlates with early failure after off-pump coronary artery bypass surgery. Ann Thorac Surg. 2005;79:1991-1998.

[2] Thatte HS, Khuri SF. The coronary artery bypass conduit: I. Intraoperative endothelial injury and its implication on graft patency. Ann Thorac Surg. 2001;72:S2245-S2252.

[3] Poston RS, Kwan MH, Gu J. Role of procurement-related injury in early saphenous vein graft failure after coronary artery bypass surgery. Future Cardiol. 2006; 2:503-512.

[4] Chong CF, Ong PJ, Moat N, Collins P. Effects of hydrostatic distention on in vitro vasoreactivity of radial artery conduits.J Thorac Cardiovasc Surg. 2004;128:609-614.

  • The VASOSHIELD Pressure Controlling Syringe delivers the benefits of controlled vessel distension, while minimizing the risk of endothelial damage.
  • The VASOSHIELD Syringe provides the flexibility of three pressure settings—150, 250, or 350 mm Hg. Starting with the lowest pressure setting, users can adjust pressure in controlled increments to accommodate any situation or vessel type.
  • As the plunger is compressed, a small amount of solution may escape from the back of the VASOSHIELD syringe.
  • Each order contains 5 VASOSHIELD Syringes per package.

Uncontrolled pressure can cause overdistension that jeopardizes conduit quality.

Vessel flushing is a common procedure that both harvesters and surgeons perform while preparing a conduit for coronary artery bypass graft (CABG) surgery. When a vessel is prepared for use as a bypass graft, it is typically distended manually with a simple syringe. This method does not permit control of the pressure inside the vessel, which can sometimes reach as high as 600 mm Hg. Although some distension may be beneficial, flushing with uncontrolled pressure can result in injury to the endothelium—and the resulting injury correlates directly with the risk of graft failure1,2.

More control over vessel distension enables the surgical team to have more control over conduit quality.

Although many clinicians recognize the risks of overdistension and use techniques to minimize its occurrence, it is very difficult to detect the actual pressures being used. Methods for histologic measurement of vessel integrity cannot provide the real-time data needed3.

It has been shown that vessels flushed at controlled pressures more effectively overcome spasm, maintain their endothelial and medial layers, and are more likely to provide a high-quality conduit4,5.  However, standard syringes commonly used for vessel flushing deliver pressure that can be much higher than surgeons or harvesters realize.[5] VASOSHIELD Pressure Controlling syringe is indicated for controlling pressure during the preparation and irrigation of blood vessels prior to use as bypass grafts.

There are no known contraindications to the use of the device.

Warnings and Precautions

Contents sterile only if protective package is not opened, damaged or broken. Avoid excessively rapid compression of the plunger during use as it may cause a transient high pressure. Do not reuse or resterilize. Dispose of the device after use per standard hospital procedure. The VASOSHIELD Syringe must not be employed for forceful irrigation of arterial conduits to reverse spasm. For routine use during vessel preparation and irrigation, always use the lowest setting possible.

Instructions for Use

Follow these easy steps to use the VASOSHIELD Pressure Controling Syringe

1. Choose the pressure setting

  • The VASOSHIELD Syringe is packaged fully assembled and pre-set for use at 150 mm Hg

To change the pressure setting, if desired, follow these steps:

A. Gently grasp the pressure setting ring with the index finger and thumb. The pressure setting ring will move more easily if held gently.

B. To unlock the pressure setting ring from the current setting: Slide the ring toward the syringe tip and then rotate it out of the setting position.

C. To select the new pressure setting: Slide the pressure setting ring to position over the desired setting marking.

D. To lock the pressure setting ring at the new pressure setting: Rotate the ring into the setting position and then slide it away from the syringe tip.

E. Verify that the setting value is visible through the pressure setting ring window to ensure that it is correctly selected and locked for proper function.
 
Note: For routine use during vessel preparation and irrigation, always use the lowest setting possible.

2. Prime the VASOSHIELD Syringe

  • Fill the VASOSHIELD Syringe in the same manner as a standard syringe per standard protocol
  • Prime the device by placing a finger over the end of the Luer-Lock tip and compressing the plunger until the check valve is released—a small amount of solution will escape from the back of the VASOSHIELD Syringe

3. Prepare and irrigate vessel

  • After the VASOSHIELD Syringe has been primed, confirm that it is set to the desired pressure setting
  • Use the device in the same manner as a standard syringe for the preparation and irrigation of the vessel

Note: The pressure setting ring locks in position at each setting, and must be unlocked to change the setting.

[1] Manchio JF, Gu J, Romar L, et al. Disruption of graft endothelium correlates with early failure after off-pump coronary artery bypass surgery. Ann Thorac Surg. 2005;79:1991-1998.
[2] Thatte HS, Khuri SF. The coronary artery bypass conduit: I. Intraoperative endothelial injury and its implication on graft patency. Ann Thorac Surg. 2001;72:S2245-S2252.
[3] Poston RS, Kwan MH, Gu J. Role of procurement-related injury in early saphenous vein graft failure after coronary artery bypass surgery. Future Cardiol. 2006;2:503-512.
[4] Chong CF, Ong PJ, Moat N, Collins P. Effects of hydrostatic distention on in vitro vasoreactivity of radial artery conduits. J Thorac Cardiovasc Surg. 2004;128:609-614.
[5] Bonchek LI. Prevention of endothelial damage during preparation of saphenous veins for bypass grafting. J Thorac Cardiovasc Surg. 1980;79:911-915

How to order

To place an order or learn more about any of the Maquet products, related accessories, or therapeutic solutions, please contact your local sales representative. 

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