Hamilton Thorne Biosciences, Inc.

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Presentation transcript:

Hamilton Thorne Biosciences, Inc. Zona Infrared Laser Optical System

Bovine Oocyte: Drill Hole Sizes Power: 140 mW Duration: Variable Diameter: 82 µm CR NA 0.6 a = 3 µm 1.0 1.5 2.0 2.5 3.0 4.0 6.0 4.5 5.0 3.5 0.5 5.5 The size of the hole in the zona is directly related to the duration of the laser pulse. However, we will show you that it is much safer to make several short pulses to create a good hole. The most important thing is the safety of the embryo. 173 µm

Peak Isotherms: 0.1 msec The common assumption was that the heat from the laser diffuses spherically. This assumption is incorrect. Actually, the heat diffuses in a cylindrical shape, resulting in higher temperatures in the beam center. P = 100 milliwatts Pulse Length = 0.1 ms

Peak Isotherms + Embryo The diffusion of heat, even at pulse duration 3 ms with a power of 100 mW, clearly extends into the embryo and may damage nearby cells. Most commercial lasers use similar or longer pulses. The maximum temperature reached, during a 3 ms pulse with power at target of 100 mW, is shown by the contours. The contours are separated by approximately 2.5°C. P = 100 milliwatts Pulse Length = 3 ms

Bovine and Mouse Zona Penetration For Various Pulse Length, Radial Position Power: 100 mW Beam Focal Radius: 3 µm The common assumption was that the zona “melts” at 100°C. This assumption is incorrect. The zona actually “melts” (undergoes denaturation) at 140°C. This graph shows both mouse and bovine embryos have a similar denaturation pattern along the 140°C line. 3 Bovine Oocytes 2 Mouse Embryos

Peak Temperatures + Zona Drilled Radius Laser Power @ Target: 140 mW λ = 1480 nm Beam Diameter: 4μm Initial Temp = 37°C Isotherms of maximum temperature reached during pulse plotted vs. pulse duration, for laser power at target 140 mW. Max error: 0.5% Radius of hole drilled in embryo Zona Pellucida (courtesy S. Lanzendorf, Jones Inst.) is also shown. Number of embryos per measurement indicated above SD error bar. CONCLUSION: Drilled radii fall closely along the 140°C peak-temperature isotherm. As demonstrated by Dr. Susan Lanzendorf at the JONES INSTITUTE, the melt line for human zona pellucida is also at 140°C.

CRI & Other Lasers and Embryo Temp. This is an important diagram showing the maximum temperature reached for pulse duration 25 ms and power at target 45 mW. This regime is potentially dangerous to the surrounding cells. Laser Heating of Cell Pulse: 25.0 ms, 45 mW Beam: 1480 nm, r = 2 μm Max Temperature shown

Laser and Embryo Temperature This diagram shows that great care must be taken if you use a pulse length as long as 3 ms. There is danger of damage to nearby cells. It is important to realize that most laser manufacturers tell you the power of the beam at the laser source. The laws of physics cause the power at the source to be very different from the laser power at the zona. The ZILOS has a power of 200 mW at the laser source, and 140 mW at the zona surface. Laser Heating of Cell Pulse: 3.0 ms, 140 mW Beam: 1480 nm, r = 2 μm Max Temperature shown

ZILOS Laser and Embryo Temperature This diagram shows the safe regime of the ZILOS with 140 mW power at target and 1 ms pulse duration. It is clear that the hole is a good size, and that selection of a drilling location at an area where there are no cells touching the zona will be safest for the blastomeres. It is easy to see that several 1 ms pulses can create a large hole in the zona while avoiding damage to the blastomeres. With a living embryo, it is worth taking a few extra seconds to increase the size of the hole if such proper treatment improves your research or fertility success. Laser Heating of Cell Pulse: 1.0 ms, 140 mW Beam: 1480 nm, r = 2 μm Max Temperature shown

Class I - Class IIIb Boundary [FDA 1999] Laser: λ = 1480 nm This graph depicts the international definition of a Class I laser at wavelength  = 1480 nm. You can see that all the ZILOS’ power and pulse combinations are within the Class I laser boundary. A Class I laser frees your laboratory from regulatory and other restrictions. The ZILOS is the only Class I laser currently on the market for zona dissection. Source: Code of Federal Regulations, 21 CFR 1040.10, 596-614, Table I and IV. 4-1-99 ed.

New Feature – Isotherm Rings 3 ms, 140 mW Shows temperature generation right on the screen Laser 140°C (hole size) 100°C The unique Isotherm Rings feature on the ZILOS helps you prevent potential harmful effects on blastomeres adjacent to the zona due to the heat from the laser drilling. The Isotherm Rings appear on the screen as a series of six concentric circles of varying colors, and indicate the maximum temperature reached at the ring diameter at various laser pulse durations. The orange ring (second from center) also indicates the drill hole size at the selected pulse duration. Please note that this picture shows a 3 ms laser pulse, for reference purposes only. Laser was not fired. 80°C 60°C 50°C

New Feature – Isotherm Rings Real-time feedback eliminates temperature guesswork With this interactive Isotherm Rings feature, users can now “see” the maximum temperature and drill hole size and eliminate the temperature “guesswork.” 3 ms Pulse, 140 mW at target 1 ms Pulse, 140 mW at target

Isotherm Rings and Drill Hole Size This image shows the Isotherm Rings relative to the drill hole size (same bovine oocyte as previously shown on Slide 2). Notice how for each hole the orange ring (140°C) matches the resultant drill hole size. Also, compare the temperatures reached near the beam at the various pulse durations.

More New ZILOS Features Enhanced laser, shorter pulses 1 – 6 millisec Minimum thermal effects Simplified & precise laser alignment New control panel and intuitive setup screens Multi-pulse firing capability Output data to ASCII file Hoffman option Remote foot/hand switch option