Abstract: The present invention generally provides a power control unit adapted to provide adjustable levels of a controlled output power signal, such as but not limited to a pulse width modulated signal or a serial binary signal. One embodiment of a power control unit according to the present invention comprises a housing holding internal electronic components. This housing further comprises input and output wiring extending out of the housing and internally connected to the electronic components. The electronic components further comprise circuitry capable of providing at least 2 levels of the controlled output power signal. The present invention also includes lighting systems incorporating a power control unit according to the invention.

Abstract: A lighting assembly comprising a housing including a front surface and a back surface, a plurality of light emitting elements on a printed circuit board (PCB) within said housing, and a reflector proximate the light emitting elements. The reflector comprises a plurality of reflective cups, wherein each reflective cup is configured to receive a respective light emitting element. The reflector is adapted to reflect light emitted from the plurality of light emitting elements in accordance with a desired light distribution pattern.

Abstract: A variable output module provides accurate full range dimming or adjustment of power output. The variable output module utilizes the characteristics of an AC or other periodic signal rather than its power output to accurately determine the level of dimming a user desires. In this manner, the variable output module provides accurate full range dimming without the need for calibration to specific AC signals. The variable output module can detect the period of an AC signal allowing the driver to be used with various frequencies without the need for calibration. In one or more embodiments, the driver compares the pulse widths of a dimmed AC signal to the period of the AC signal to determine the desired level of dimming.

Abstract: A lighting assembly comprising a housing including a front surface and a back surface, a plurality of light emitting elements on a printed circuit board (PCB) within said housing, and a reflector proximate the light emitting elements. The reflector comprises a plurality of reflective cups, wherein each reflective cup is configured to receive a respective light emitting element. The reflector is adapted to reflect light emitted from the plurality of light emitting elements in accordance with a desired light distribution pattern.

Abstract: Apparatus and methods are disclosed that control power supplies to automatically provide the appropriate voltage to drive constant current devices. A lighting system according to the present invention comprises a lighting module having a constant current device that provides a constant current in response to constant current voltage. A power supply is included that generates a power supply voltage coupled to the lighting module. A feedback circuit is included from the lighting module to the power supply causing the power supply voltage to be sufficient to provide a constant current voltage at the LED module. A method according to the present invention for generating a constant current voltage to drive a constant current device, comprises providing a drive voltage to a constant current device. The current at the constant current device is sensed a first time, and the drive voltage is increased. The current to the constant current device is sensed a second time.

Abstract: A variable output module provides accurate full range dimming or adjustment of power output. The variable output module utilizes the characteristics of an AC or other periodic signal rather than its power output to accurately determine the level of dimming a user desires. In this manner, the variable output module provides accurate full range dimming without the need for calibration to specific AC signals. The variable output module can detect the period of an AC signal allowing the driver to be used with various frequencies without the need for calibration. In one or more embodiments, the driver compares the pulse widths of a dimmed AC signal to the period of the AC signal to determine the desired level of dimming.

Abstract: The present invention generally provides a power control unit adapted to provide adjustable levels of a controlled output power signal, such as but not limited to a pulse width modulated signal or a serial binary signal. One embodiment of a power control unit according to the present invention comprises a housing holding internal electronic components. This housing further comprises input and output wiring extending out of the housing and internally connected to the electronic components. The electronic components further comprise circuitry capable of providing at least 2 levels of the controlled output power signal. The present invention also includes lighting systems incorporating a power control unit according to the invention.

Abstract: Apparatus and methods are disclosed that control power supplies to automatically provide the appropriate voltage to drive constant current devices. A lighting system according to the present invention comprises a lighting module having a constant current device that provides a constant current in response to constant current voltage. A power supply is included that generates a power supply voltage coupled to the lighting module. A feedback circuit is included from the lighting module to the power supply causing the power supply voltage to be sufficient to provide a constant current voltage at the LED module. A method according to the present invention for generating a constant current voltage to drive a constant current device, comprises providing a drive voltage to a constant current device. The current at the constant current device is sensed a first time, and the drive voltage is increased. The current to the constant current device is sensed a second time.

Abstract: A first embodiment of a support system for a surgical retractor device includes a pair of vertically extending support members, releasably attachable to a patient support platform, at least one horizontally extending cross bar attached to and supported by the pair of vertically extending support members, and at least one lifting device disposed on the at least one cross bar and attached for retraction to a retractor assembly. The first embodiment may further include a horizontal extension, upon which may be mounted a lifting device. The first embodiment may further include a second cross bar, upon which a second lifting device may be mounted.

Abstract: In one embodiment, the present invention relates to a low profile support member for a surgical retraction apparatus which includes a support member in which a lower portion of the support member has a rectilinear portion for insertion into an anchoring receptacle; an upper portion of the support member has a first horizontal extension; a splined coupling adaptor connects together the lower and upper portions, in which the splined coupling adaptor includes a splined segment having a key-like splined portion and a lock-like splined portion; and an extender portion having both a vertical extension and a second horizontal extension. The extender portion is mountable on the first horizontal extension.

Abstract: The present invention provides a set of rakes for retraction of the patient's ribs and thoracic region in, e.g., a reoperative midsternotomy surgical procedure, for providing additional support as the surgical cavity is enlarged during the course of dissection of, e.g., the internal mammary artery during its harvest for use in a coronary bypass procedure. The present invention provides as a retraction device a xiphoid rake for providing support to a body portion in a surgical procedure which includes forming a surgical cavity by a xiphoid entry, wherein the xiphoid rake is substantially stronger than conventional retractor rakes and provides a large body-supporting portion for providing greater sternal support as required in the surgical procedure.

Abstract: A first embodiment of a support system for a surgical retractor device includes a pair of vertically extending support members, releasably attachable to a patient support platform, at least one horizontally extending cross bar attached to and supported by the pair of vertically extending support members, and at least one lifting device disposed on the at least one cross bar and attached for retraction to a retractor assembly. The first embodiment may further include a horizontal extension, upon which may be mounted a lifting device. The first embodiment may further include a second cross bar, upon which a second lifting device may be mounted.

Abstract: The present invention relates to a cable plate retractor assembly which includes a pivotable mounting plate to which a rake and a cable plate assembly are attached. The length of both the rake and the lifting plate portion of the cable plate assembly is threadably adjustable relative to the mounting plate. A method of retracting a portion of a patient's body adjacent a surgical cavity includes making a first surgical incision, placing a rake in a position for retraction, retracting a first portion of the patient's body with the rake, making a second surgical incision, inserting a first end of a cable with a lifting plate thereon into the surgical cavity, drawing the first end of the cable through the second incision whereby the lifting plate is retained in the patient's body at a second end of the cable, adjusting the position of at least one of the rake and the lifting plate relative to the mounting plate, and retracting a second portion of the patient's body by raising the lifting plate.

Abstract: The present invention includes a set of rakes for use as surgical retractors in a surgical procedure in which the set of rakes includes a progressively longer body-supporting base portion. The present invention further includes a C-shape surgical retraction device including a rake end for lifting a first body portion, a pad end for depressing a second body portion and, e.g., a ring for attaching a lifting device, in which the device is adapted for use in a mid-cab surgical procedure. The present invention provides a set of rib rakes for retraction of the patient's ribs and thoracic region in a mid-cab procedure, in which each retractor rake has a progressively larger body-supporting portion, for providing additional support as the surgical cavity is enlarged during the course of dissection of, e.g., the internal mammary artery during its harvest for use in a coronary bypass procedure.

Abstract: A runaway protection mechanism is provided which is truly nondestructive in nature and which is highly advantageous for an electric motor used in, for example, an exercise treadmill for driving its moving treadmill belt. In use, the electric motor is connected to an electric power source, such as an alternating-current wall outlet. The runaway protection mechanism includes a disconnect mechanism for disconnecting the motor from the electric power source and thereby deenergizing the motor. The runaway protection mechanism further includes a safety mechanism for comparing the actual motor speed with a desired motor speed and activating the disconnect mechanism when the actual speed exceeds the desired speed by a predetermined amount. In this manner, an orderly and nondestructive shutdown of the motor is accomplished when a fault condition is recognized.

Abstract: A first embodiment of a support system for a surgical retractor device includes a pair of vertically extending support members, releasably attachable to a patient support platform, at least one horizontally extending cross bar attached to and supported by the pair of vertically extending support members, and at least one lifting device disposed on the at least one cross bar and attached for retraction to a retractor assembly. The first embodiment may further include a horizontal extension, upon which may be mounted a lifting device. The first embodiment may further include a second cross bar, upon which a second lifting device may be mounted.

Abstract: A first embodiment of a surgical retractor includes a Z-shape rake plate, one or more rakes for applying a retractor force to a portion of a patient's body, and pivoting mounting means for mounting the rakes to the rake plate. Means are provided to adjust the extension of the rakes relative to the rake plate, and various connections are provided for connecting the rakes to the rake plate. The rake plate is Z-shape to facilitate placement relative to a surgical cavity of a patient. A method of holding open a surgical cavity includes the placing of rakes relative to the cavity and adjusting the position of the respective rakes relative to the rake plate to thereby retract the portion of the patient's body and provide access to the surgical cavity.

Abstract: A surgical retractor includes a rake plate, and plural rakes for applying retractor force to a body. The rakes are pivotably mounted to the rake plate, and the length of the rakes may be adjusted relative to the rake plate. Various connections are provided for connecting the rakes to the rake plate. Also, the rake plate is concave to facilitate placement relative to a surgery cavity of a patient. A method of holding open a surgery cavity includes the placing of the rakes relative to the cavity and adjusting the length of the respective rakes.