Driver for captively holding a fastener during assembly and disassembly of two parts

{
  "publication_number": "US6216570B1",
  "country": "US",
  "kind": "B1",
  "title": "Driver for captively holding a fastener during assembly and disassembly of two parts",
  "abstract": "A percutaneous access device implantable beneath the skin of a patient includes a turret assembly containing current limiters, electrical contacts and fluid couplings and includes a sealing device having a small screw fastener at the bottom of the turret assembly. A screwdriver is provided configured to have access through a required air inlet passage to provide rapid removal and replacement of a new turret. The screwdriver includes a shaft having an eccentric drive socket. A handle has a roller clutch bearing pressed in place to allow the handle to freely turn clockwise to tighten the screw but locks the handle to the shaft for screw extraction in the counterclockwise direction. A driver captively engages a fastener for assembling a first part having a shoulder to a mating fitting having an aperture. The driver includes a shaft having a fastener-engaging end, and a mechanism, operably engageable between the shaft and the first part, for holding the fastener in a full forward position against the shoulder of the first part during attachment of the fastener to the aperture of the mating fitting.",
  "claims": [
    "1. A driver for captively engaging a fastener for assembling a first part having a shoulder to a mating fitting having an aperture comprising: a shaft having a fastener-engaging end; a handle connected to the shaft; means for adjusting maximum torque transmittable from said handle to said fastener including a conical washer disposed between a threaded locking collar and a first slip washer set on a shoulder of said handle, wherein the means for adjusting maximum torque further includes a roller clutch bearing annularly disposed on said shaft and a second slip washer set on an annular flange on said shaft, such that said roller clutch is disposed between said first and second slip washers; and means, operably engageable between the shaft and the first part, for holding the fastener in a full forward position against the shoulder of the first part during driving of said fastener with respect to the aperture of the mating fitting.",
    "2. A driver for captively engaging a fastener for assembling a first part having a shoulder defining a transition between an aperture having first and second peripheral walls to a mating fitting having an aperture comprising: a shaft having a fastener-engaging end; means, operably engageable between the shaft and one of said first and second peripheral walls of the first part, for holding the fastener in a full forward position against the shoulder of the first part during driving of said fastener with respect to the aperture of the mating fitting; and means for rotating said shaft with a handle up to a predetermined torque during attachment of said fastener and for locking said handle with respect to said shaft during reverse rotation of said shaft when detaching said fastener.",
    "3. The driver of claim 2, wherein the rotating and locking means further comprises a roller clutch bearing disposed between a portion of said handle and a portion of said shaft.",
    "4. The driver of claim 2, further comprising: said handle having an inwardly facing shoulder portion, the shoulder portion having a first surface and a second surface; a first slip washer engageable with the first surface of the shoulder portion of the handle; and said shaft having an outwardly extending radial flange for supporting the second surface of the shoulder portion; and a second slip washer disposed between said radial flange and said second surface of said shoulder portion of said handle.",
    "5. The driver of claim 4, wherein the first and the second slip washers are constructed of materials having similar static and dynamic coefficient of friction values.",
    "6. The driver of claim 2 further comprising adjustable means for providing a preselected seating torque to said fastener."
  ],
  "description_excerpt": "This invention pertains to a driver for captively holding a fastener during assembly and disassembly of two parts, and more particularly to percutaneous access devices employed to establish a connection through the skin between an organ or device implanted within the human body and an external device such as a monitor, pump or the like. More particularly, this invention pertains to means for accessing the electrical conduits as well as fluid conduits and mechanical connection features of the percutaneous access device.\n\nPercutaneous access devices hereinafter referred to as PAD, are employed to establish a connection projecting outward through the skin between an organ or a device implanted on a long term basis within the human body, and an external device such as a monitor, pump or the like. The PAD provides both mechanical and electrical access to the internal organs or devices and as such can be equipped with channels for conveying fluids or gases as well as electrical contacts for transmitting signals, for example, an ECG, or supplying power to devices. Such electrical contacts are usually partially exposed and could convey voltages and currents or become the grounding point for a substantial discharge of electricity generated in fabrics, carpets and the like. For this reason it is necessary to install a current limiting device between the PAD contact and the organ or device, and this places the location of the limiter within the PAD (as a non-surgically renewable component).",
  "cpc": [
    "A61M 39/0247",
    "A61B 17/8894",
    "A61B 2090/031",
    "B25B 13/48",
    "B25B 23/14"
  ],
  "ipc": [
    "A61B 17/88",
    "A61B 19/00",
    "A61M 1/00",
    "B25B 13/48",
    "B25B 23/14"
  ],
  "assignees": [
    "LVAD TECHNOLOGY INC"
  ],
  "inventors": [
    "FREED PAUL S"
  ],
  "filing_date": "1999-01-05",
  "publication_date": "2001-04-17",
  "grant_date": "2001-04-17",
  "priority_date": "1999-01-05",
  "application_number": "US-22558499-A",
  "family_id": "22845451",
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}