DR. RANDALL JEFFREY LEWIS, M.D.
Medical Practice at Wisconsin Ave, Bethesda, MD

8518044, Aug 27, 2013

Sep 29, 2009

12/586876

Christopher G. Sidebotham - Mendham NJ, US
Randall J. Lewis - Bethesda MD, US
Leon Roitburg - East Hanover NJ, US

A61B 17/00

606 80

A low cost disposable flexible reamer shaft has a flexible cylindrical braided tube shaft with an outer diameter in the range of 4 to 14 millimeters and 250 to 400 mm length, and a central aperture for insertion of a flexible polymeric tube. The braided tube shaft is permanently attached to a first end element and a second end element. The threaded end of the first end element attaches to female threads of modular tapered, cylindrical or spherical, hollow or solid reamer assembly. The second end element fits into a chuck of a drive motor. The threaded attachment of the first end provides local centerline matching. A guide pin is inserted in the bone cavity, which enters the reamer. The central aperture of the flexible polymeric tube provides centerline matched, wobble-free reaming. The reaming end point is precisely the guide pin inserted location while the reaming direction is controlled by the surgeon by flexing the flexible reamer shaft.

8449545, May 28, 2013

Feb 27, 2008

12/072522

Christopher G. Sidebotham - Mendham NJ, US
Randall J. Lewis - Bethesda MD, US

A61B 17/00

606 80, 606 79

An easy-to-assemble modular reamer for medical applications includes a shaft portion, a disposable tapered hollow reamer and a modular pilot. The shaft portion has a proximal end for attachment to a drill, two or more torque transmitting tabs and a distal threaded end. The disposable tapered hollow reamer has an integrally attached cutter sleeve with externally protruding cutters, apertures through the sleeve thickness for discharging bone fragments and cement debris and inwardly protruding anchoring projections. A central molded polymeric portion attaches to the anchoring projection and is fixed to the shaft through central holes and slots in the polymeric portion, which engage torque transmitting shaft tabs. Channels in the polymeric portion collect bone fragments and bone debris. A threaded modular pilot coaxially secures the disposable tapered hollow reamer to the threaded distal end of the shaft, permitting rotation of the tapered hollow reamer without wobbliness.

8540716, Sep 24, 2013

Aug 27, 2009

12/583873

Christopher G. Sidebotham - Mendham NJ, US
Randall J. Lewis - Bethesda MD, US
Leon Roitburg - East Hanover NJ, US

A61B 17/00

606 80

A low cost disposable reamer shaft is made from a rod or tube stock of stainless steel, Nitinol or fiber reinforced polymer having a precise outer diameter in the range of 4 to 14 millimeter and is cut to a shaft length of 250 to 400 millimeters. An attachment piece with male or female thread matching a spherical hollow or tapered hollow reamer is machined and glued with epoxy on one end of the rod of tube stock using a precision centerline aligning jig. An attachment piece for connecting to a drive power unit is machined and glued with epoxy to the other end of the rod or tube stock thus forming a low cost disposable reamer shaft that aligns the centerline of the shaft with that of the reamer. The shaft contacts the reamer at two attachment locations that are displaced from each other, providing precise centerline alignment.

8555440, Oct 15, 2013

Apr 30, 2008

12/150730

Randall J. Lewis - Bethesda MD, US

A47C 27/08

5713, 5 811 HS, 5423, 5706, 5710

An air mattress has a top chamber and a bottom chamber separated by a barrier. The patient rests on the top surface of the top chamber, which has a plurality of apertures discharging air through apertures that are not blocked by the patient. The top chamber is provided with temperature-controlled heated or cooled air at a regulated pressure. Heated or cooled air from the top chamber is delivered to an area substantially surrounding the patient. The bottom chamber has a bottom surface containing a plurality of apertures that remain closed due to the weight of the mattress and the patient when the pressure-regulated air is beneath a pre-selected value. When the air pressure is increased, the apertures at the bottom surface of the bottom chamber emit air, creating an air cushion underneath the air mattress that facilitates lateral movement of the mattress over a flat or irregular surface, such as from a hospital bed to a stretcher, or from a stretcher to an operating table.

8523866, Sep 3, 2013

Oct 5, 2007

11/973260

Christopher G. Sidebotham - Mendham NJ, US
Randall J. Lewis - Bethesda MD, US

A61B 17/00

606 80

A reamer for medical applications comprising a shaft portion, a disposable tapered hollow reamer sleeve and a modular pilot. The shaft portion has a proximal end for attachment to a drill, a central cone element with one or more slots and a distal threaded end. The reamer sleeve has attached one or more torque transmitting tabs at the larger end and a collet taper at the smaller end and slides over the shaft engaging tabs with the slots. The modular pilot has a threaded central aperture engaging shaft thread and a collet taper mating with the collet taper of the reamer sleeve substantially coinciding their centerlines. The disposable hollow cutter sleeve has a plurality of cutting elements and apertures that discharge bone and bone cement debris into the space between the reamer and the shaft. With this construction, the reamer transmits reliable reaming torque in an efficient manner.

8518043, Aug 27, 2013

Aug 24, 2009

12/583704

Christopher G. Sidebotham - Mendham NJ, US
Randall J. Lewis - Bethesda MD, US

A61B 17/00

606 80

A low cost disposable spherical hollow reamer for medical applications includes a reusable shaft and a disposable spherical hollow reamer. The hollow reamer is thin sheet metal with 0. 125 mm to 0. 812 mm thickness and has plurality of cutters and apertures that extend through its thickness. The shaft has a proximal end for attachment to a drill and a distal precision threaded screw end. The spherical hollow reamer has welded first plate in its interior with a precision threaded aperture engaging with the threaded end of the reusable shaft. The spherical hollow reamer has a welded second plate with a central precision aperture that slides over the shaft external surface. The threaded attachment and sliding fit attachment provides wobble free reaming action. The welded second plate in combination with the interior surface of the spherical hollow reamer forms enclosed space for capturing bone fragment and bone cement debris.

8535316, Sep 17, 2013

Feb 9, 2007

11/704754

Randall J. Lewis - Bethesda MD, US
Christopher G. Sidebotham - Mendham NJ, US

A61B 17/00

606 80

A reamer for medical applications includes an elongated shaft portion and a disposable hollow cutter assembly. The shaft portion's distal end has a coupling portion appointed for attachment to a drilling device, and the proximal end has a threaded portion. The cutter assembly includes a disposable hollow cutter sleeve and a pilot tip. The cutter sleeve has an outer surface and a hollow construction, and is preferably appointed for a single use. In addition, the disposable cutter sleeve portion has a plurality of cutting teeth and a plurality of apertures on the outer surface. The pilot tip has a threaded inner surface and is attached to the disposable cutter sleeve. The cutter assembly is adapted to slide over the proximal end of the shaft portion, thereby enabling the pilot tip to be threaded with the threaded portion of the proximal end of the shaft portion.