A liftable keyboard for a portable electronic device is provided. The portable electronic device includes a top cover and a base. The liftable keyboard includes at least one key unit, a membrane switch circuit layer and a micro pump. Each key unit includes a keycap and an elastomer. When a sensing element within the base of the portable electronic device senses that the top cover is close to the base, the micro pump is enabled to perform a gas-extracting action. Consequently, the gas in the elastomeric chamber is extracted so that the elastomer is subjected to compressed deformation. The keycap is moved downwardly in response to the compressed deformation of the elastomer so as to reduce an altitude of the at least one key unit.

A liftable keyboard for a portable electronic device is provided. The portable electronic device includes a top cover and a base. The liftable keyboard includes a key unit, a membrane switch circuit layer, a vent valve and a pump. The key unit includes a keycap and an elastomer. The vent valve includes an inlet, an outlet and a gas exhaust chamber. The inlet and the outlet are in communication with a gas-inputting port and a gas-outputting port of the membrane switch circuit layer, respectively. The gas exhaust chamber is in communication with the pump. When a sensing element of the base senses that the top cover is close to the base, the pump is enabled to perform a gas-extracting action. The elastomer is subjected to compressed deformation and the keycap is moved downwardly. Consequently, an altitude of the key unit is reduced.

A backlight keyswitch includes a keyswitch body, a membrane circuit board disposed under the keyswitch body, a backlight module and an elastic body having a bridge structure, a central pillar, and a ring-shaped base disposed on the membrane circuit board. The keyswitch body has a keycap with a symbol. The backlight module is disposed under the membrane circuit board for emitting light to the symbol. The elastic body is disposed between the keycap and the membrane circuit board for returning the keycap to its original position. The bridge structure extends from the ring-shaped base toward the keycap to connect to the central pillar for supporting the central pillar, such that the central pillar is suspended relative to the membrane circuit board and abuts against the keycap. A projection of the central pillar on the keycap completely covers the symbol.

Embodiments of negative pressure wound therapy systems and methods are disclosed. In one embodiment, an apparatus includes a housing, a negative pressure source, a canister, an antenna, and one or more controllers. The negative pressure source can provide negative pressure via a fluid flow path to a wound dressing. The canister can be positioned in the fluid flow path and collect fluid removed from the wound dressing. The antenna can be supported by the housing and wirelessly communicate with an electronic device. The antenna can be oriented in the housing to face downward toward the ground when the negative pressure source is providing negative pressure. The one or more controllers can activate and deactivate the negative pressure source and transmit first data to the electronic device using the antenna or receive second data from the electronic device using the antenna.