Cardiac Resynchronization Therapy
Defibrillator (CRT-D)

Only the X4 quadripolar CRT-D provides 17 pacing vectors plus industry-leading projected longevity for more streamlined patient care.

Key Resources


Product Details


Models G140, G141, G146, and G148

  • The X4 CRT-D and ACUITY™ X4 lead portfolio features electrodes on a 3D spiral designed to allow pacing from a basal location without sacrificing fixation or thresholds; 17 pacing vector options to manage around PNS and high thresholds; and multiple lead shapes with a 2.6F (0.86 mm) tapered lead tip to improve predictability of accessing target vessels.
  • Projected to last 8+ years under true usage conditions.
  • This small (32.0 cm3) and thin (9.9 mm) high-energy device is designed to enhance patient comfort.
  • Offers an advanced system solution for patient comorbidities and HF monitoring (HF Perspectiv™ report, LATITUDE™ NXT Remote Patient Management with weight scale and blood pressure sensors).
  • Offers AcuShock™ Technology, multiple programmable options to reduce inappropriate and unnecessary shocks, including a choice of rhythm discriminators, antitachycardia pacing (ATP) therapy in all rates zones, and advanced sensing and filtering.
  • EasyView™ header and color coded lead ports designed to make the implant experience more efficient.
  • SafetyCore™ technology is intended to provide lifesaving shock therapy and basic pacing functionality in the event of an unrecoverable fault.

Mechanical Specifications

Model Type Size (cm)
(W x H x D)
Mass (gr) Volume (cm3) Connector Type
G148 X4-CRT-D 5.37 x 8.18 x 0.99 73.8 32.5 RA:IS-1; RV:DF4; LV:IS4
G146 X4-CRT-D
5.37 x 8.08 x 0.99 73.4 32.0 RA:IS-1; RV:IS-1/DF–1; LV:IS4
G140 CRT-D 5.37 x 8.18 x 0.99 73.6 32.5 RA:IS-1; RV:DF4; LV:IS-1
G141 CRT-D 5.37 x 8.08 x 0.99 72.8 32.0 RA:IS-1; RV:IS-1/DF–1; LV:IS-1

Pulse Generator Longevity (All Models ᵃ, ᵇ, ᶜ, ᵈ)

Pacing Amplitude Longevity (years) at 500Ω and 700Ω 
Pacing Impedance (RV and LV)
RA/RV LV 500Ω 700Ω
2.5 V 3.0 V 8.1 8.6
2.5 V 3.5 V 7.6 8.2
3.5 V 3..5 V 6.8 7.5
3.5 V 5.0 V 5.7 6.5

Longevity Information

  • For longevity calculations based on different settings please contact Boston Scientific
    technical services or your local representative.
  • Boston Scientific devices have corporate warranties at 6 years in available geographies.
  • Devices use Li/MnO2  chemistry.
  • The Usable Battery Capacity is 1.9 Amp-hours (typical implant to battery capacity depleted).
  • Shelf life is 2 years (before use by).