Abstract: Techniques for providing multi-user multi-touch projected capacitive touch sensors are disclosed herein. Some embodiments may include a method that includes receiving a first sense signal from a first sensing array, the first sensing array configured to provide the first sense signal indicating a first touch on a first touch surface of a touch substrate as well as receiving a second sense signal from a second sensing array, the second sensing array configured to provide the second sense signal indicating a second touch on a second touch surface of a second touch substrate occurring concurrently to the first touch. The method may further include determining whether the first touch and the second touch share at least one anti-ghost. The method may also include associating the first touch and the second touch with a common touch entity in response to determining that the first touch and the second touch share the at least one anti-ghost.

Abstract: Drainage device for dental or medical or veterinary purposes. The preferred device, for dental purposes, comprises an elongated tube and a flange near one end (the drainage end) thereof. The flange has suture holes to facilitate suturing to the patient's gum. Representative dimensions for dental purposes are: overall length, 0.25-2 inch; outside diameter of tube, 0.04-0.2 inch; inside diameter of tube, 0.02-0.1 inch; tube wall thickness, 0.01-0.05 inch; diameter of flange, not more than 0.5 inch. The device is made of a biocompatible resilient elastomer. To use, the dentist cuts a hole through the patient's gum to the abscess site in the usual manner, inserts the insertion end of the tube (the end remote from the flange) so that it is at the abscess site and sutures the flange to the patient's gum.