DR. DENIS BURKE DRENNAN
Medical Practice at Austin St, Evanston, IL

4186738, Feb 5, 1980

Feb 15, 1978

5/877876

Thomas R. Schleicher - Northbrook IL
Donald J. Maylahn - Skokie IL
Denis B. Drennan - Evanston IL

A61F 530

128153

A heel supporting and protective boot for bed patients comprises a body formed of flexible, resilient, open-celled, nonallergenic, sheet-like, foam material having an inside supporting surface provided with a plurality of alternate peaks and valleys, with the peaks adapted for contact against the skin of the patient. The body includes a pair of opposite sidewall portions adapted to bear against and support the sides of the patient's lower leg, ankle and foot. A leg support portion is provided between the opposite sidewall portions for supporting the patient's leg with the heel at a level above the adjacent bed surface and well exposed to the air, generally out of contact with adjoining portions of the boot. The body of the boot also includes a foot support portion for supporting the sole of the patient's foot in an upright position and without contact with the patient's heel. Fastening means is provided for securely interconnecting the opposite sidewall portions above the patient's leg for positively retaining the boot in place in a secure manner.

5449339, Sep 12, 1995

May 6, 1994

8/239336

Denis B. Drennan - Evanston IL

DM Systems, Inc. - Evanston IL

A61F 500

602 23

A heel supporting protective boot for bed patients comprises a body formed of flexible, compressible, convoluted, non-allergenic foam material having foot and leg supporting portions for respectively supporting a patient's foot extended in an upright position and for supporting the patient's leg above the bed in a generally horizontal position with the patient's heel elevated above an adjacent bed surface. The boot includes a friction reducing material on the body below the leg and heel for providing free sliding movement of the boot over the bed surface with minimal resistance in order to avoid bunching-up of bed linens and avoiding dislocation of the patient's foot in the boot resulting in heel binding or lack of support for the sole of the patient's foot. An additional pad of a foam material may be adhesively secured to an outer surface of the boot to prevent external rotation of the leg and the pad may also be adhesively secured inside the boot adjacent the foot supporting portion to limit foot drop.

8535246, Sep 17, 2013

Apr 15, 2010

12/761156

Denis Burke Drennan - Evanston IL, US
Daniel William Southard - Folsom CA, US

DM Systems, Inc. - Evanston IL

A61B 5/103

600587

A pressure monitoring method and system for warning a patient or caregiver that soft tissue pressure has exceeded some predetermined level that over time would necessitate moving the patient to minimize or prevent soft tissue damage. The method and system entail the use of a pressure-sensitive pad assembly adapted to be applied to a surface of the patient's body and generate electrical outputs corresponding to soft tissue pressure sensed at the surface. The system monitors the electrical outputs over a preselected time period and generates a cumulative output signal based on the electrical outputs and corresponding to whether or not the soft tissue pressure has exceeded a predetermined pressure level during the preselected time period. The system generates audible and visual warnings if the cumulative output signal exceeds a predetermined cumulative threshold until the soft tissue pressure drops below the predetermined pressure level.

6962011, Nov 8, 2005

Sep 16, 2004

10/711397

Denis Burke Drennan - Evanston IL, US

A43B003/24, A43B013/20

36110, 36 29

A cast shoe sized and configured to be worn on a casted foot. The shoe includes an air-insufflated outer sole formed of a resilient polymeric material to absorb impact. The outer sole has a heel portion of substantially uniform thickness, a tapered toe portion that is thinner than the heel portion, an upper surface, and a lower surface that has a tread pattern and is curved as a result of the tapered toe portion to provide a single rocker bottom function in gait. An inner sole overlies and is attached to the upper surface of the outer sole. A strap located adjacent the heel portion of the outer sole is provided for securing the cast shoe to a casted foot. The outer and inner soles lack any rigid member that would stiffen the sole.

D311232, Oct 9, 1990

Dec 1, 1986

6/935609

Denis B. Drennan - Evanston IL
Donald J. Maylahn - Skokie IL

DM Systems, Inc. - Evanston IL

D21191

8444584, May 21, 2013

Sep 1, 2010

12/873746

Denis Burke Drennan - Evanston IL, US

DM Systems Inc. - Evanston IL

A61F 13/00, A41B 11/00

602 63, 602 60, 602 61, 602 62, 2239

A compression hose adapted to be worn to cover at least the calf and foot of a leg of an individual, and a method for medically treating the individual with the compression hose. The compression hose includes connected leg and foot portions formed of an elastic fabric material and adapted to cover, respectively, the calf and foot of the individual. A heel opening is located between the leg and foot portions so as to be located in the compression hose to coincide with the heel of the leg of the individual. The heel opening has a perimeter defined by a stitch that limits stretching and expansion of the heel opening relative to stretching and expansion of the leg and foot portions of the compression hose.

4372300, Feb 8, 1983

May 13, 1981

6/263264

Denis B. Drennan - Evanston IL
Donald J. Maylahn - Skokie IL
Thomas R. Schleicher - Wilmette IL

DM Systems, Inc. - Evanston IL

A61F 504

128 83

A cast wedge for use in adjusting a tubular cast for maintaining predetermined spacing between opposite facing edges of a transverse cut made in the cast wall adjacent the area of the limb fracture. The wedge includes a body formed of molded, resinous plastic material that is radio-lucent having a wedge portion with opposite edges spaced a predetermined distance apart for direct engagement with the facing edges of the cut in the wall of the cast. Flanges are formed to extend outwardly and normal to the opposite edges of the wedge portion and the flanges have an inside surface engageable with the outer surface of the cast for limiting the inward travel of the wedge portion into the interior of the cast.

7052479, May 30, 2006

Aug 20, 2004

10/711072

Denis Burke Drennan - Evanston IL, US

A61F 5/00

602 32, 602 36, 602 33, 602 23

A traction device for applying traction to a patient's leg while supporting the patient's foot to avoid foot drop and heel or lateral malleolar pressure ulcers. The device includes a body having forefoot and lower leg portions, a continuous cavity within the forefoot and lower leg portions, and an anterior opening sized to permit a patient's foot and lower leg to pass therethrough into the cavity. The body supports the patient's lower leg so that the patient's heel is suspended within the cavity. Elements adjustably close the anterior opening and traction straps are removably attached to lateral regions of the body and extend from the forefoot portion. The interior surface of the cavity provides a sufficiently high friction interface with the patient's lower leg to prevent sliding of the body on the lower leg when full traction loads are applied through the traction straps.