1
Neal Semrad: Process and device for creating new tunnels in tissue. Wagner & Middlebrook, August 10, 1993: US05234438 (84 worldwide citation)

A process for tunneling in tissue to install catheters and the like includes insertion of a hollow needle through the skin and, exiting from the skin as limited by the length of the needle or the catheter to be installed. A suture is then fed through the needle after which pulling tip of diameter ap ...


2
Neal Semrad: Toggle catheter. Wagner & Middlebrook, January 22, 1991: US04986810 (81 worldwide citation)

An improved catheter comprising a tubular body of flexible material designed for medical use and insertion into a body cavity. The catheter includes at least one opening towards the distal end for the drainage of fluids or their introduction or for monitoring pressures from the body cavity and at le ...


3
Neal Semrad: Chest tube device and method of inserting device. John E Wagner, March 21, 1989: US04813929 (71 worldwide citation)

A method and assembly of components for effecting closed chest thoracostomy includes insertion of a large bore needle into the chest cavity following local anesthesia. A guide wire is inserted into the pleural cavity through the needle and the needle is removed. An incision of one to one and one-hal ...


4
Neal Semrad: Stop guide wire and double ended obturator-catheter-sheath system and method of use of same. Wagner & Middlebrook, October 22, 1991: US05059183 (49 worldwide citation)

A guide wire/obturator catheter system for minimizing the possibility of cavity back wall penetration is disclosed. The device is provided with tactile and visual indications of obturator and catheter positioning within the cavity to aid in the precise placement. Another embodiment provides a functi ...