Abstract: Embodiments of golf club heads, golf clubs, and methods to manufacture golf club heads and golf clubs are described herein. In one example, a golf club head includes a body portion with a front opening and a back opening, a face portion closing the front opening, and a back cover portion that closes the back opening and includes at least 50% of the total area of the back portion, a first port, and a second port. A first mass portion and a second mass portion engage the first port and the second port to close the first port and a second port, respectively. The first mass portion and the second mass portion each includes a material with a greater density than the material of the body portion and the material of the back cover portion. Other examples and embodiments may be described and claimed.

Abstract: Trans-esophageal cardiac compression is performed during cardiopulmonary resuscitation by introducing into the esophagus a tube (12) having a distal inflatable member, such as a balloon (20). The balloon (20) is positioned in the esophagus (48) at the level of the ventricles of the heart (50). A rapidly cycling pump (16) (such as a compressible bag) is attached to the tube (12), and used to inflate and deflate the balloon (20) on the tube (12). As the balloon (20) inflates, it compresses the ventricles against the sternum (54), increases the transmural pressure across the ventricular wall, and propels blood out of the heart (50) into the aorta and pulmonary arteries. The balloon (20) is inflated and deflated at a rate of approximately 60 cycles to 80 cycles per minute to maintain perfusion of the heart, brain and other vital organs until more definitive therapy can reestablish the contractile activity of the heart.

Abstract: A device for high-speed transcription of physiological data recorded at substantially lower speeds includes a device for converting the recorded data into electrical signals, a device for converting the electrical signals into light signals and displaying them with high clarity and resolution, and a device for transcribing the light signals onto light-sensitive media at high speed.