T-type folded SIW-based leaky-wave antennas with wide scanning angle and low cross-polarization

In this paper, a leaky-wave antenna (LWA) with wide scanning angle and low cross-polarization is proposed based on a T-type folded substrate-integrated waveguide (FSIW). Transverse slots with a sinusoidal distribution pattern are etched on the surface of the FSIW so that transmission lines with slow-wave characteristics can excite and radiate −1 order harmonics. The length of the transverse slot affects the dispersion characteristics of the transmission line, and the sinusoidal modulation period controls the operating range of the LWA. In the frequency range of 8.3–15 GHz, the proposed LWA achieves a wide scanning ranging from backward −42° to forward +68° continuously. The cross-polarization of the beam is also kept at less than −30 dB during this scanning. A prototype is fabricated and measured to confirm the design, and the measured results show an agreement with the simulated one.

Individualized Implant: A surgical advice for rotational stability and additional proximal locking of the Fassier-Duval telescoping nail

Background When stabilizing fractures and osteotomies in growing patients with special conditions of the long bones, the use of the Fassier-Duval nail as intended by the manufacturer (Pega Medical, Quebec, Canada) [1], shows that one problem with passive telescopic nails has not yet been solved. No stability in the rotation can be achieved. Postoperative to immobilize with plaster casts are obsolete in patients with osteogenesis imperfecta, as additional osteopenia due to immobilization must be feared. Especially with fractures and osteotomies in proximal femur long leg spica casts are a torture to patients and caregivers. Methods By experience in different surgical procedures in usage of the Fassier-Duval nailing system a technical solution for rotational stability of the nail as well as for locking of the nail in the proximal and distal physis could be developed. Results A transverse slot can be cutted in all available diameters of the female parts to make the FD nail rotationally stable. A proximal locking hole can be drilled individually by the surgeon on the operating table. The technical solution to the problems is presented in two exemplary cases in this article.Conclusions Rotational stability and additional proximal locking options can be achieved by additionally individualization of the Fassier-Duval telescoping nail during surgery.

Individualized Implant: A surgical advice for rotational stability and additional proximal locking of the Fassier-Duval telescoping nail

Background When stabilizing fractures and osteotomies in growing patients with special conditions of the long bones, the use of the Fassier-Duval nail as intended by the manufacturer (Pega Medical, Quebec, Canada) [1], shows that one problem with passive telescopic nails has not yet been solved. No stability in the rotation can be achieved. Postoperative to immobilize with plaster casts are obsolete in patients with osteogenesis imperfecta, as additional osteopenia due to immobilization must be feared. Especially with fractures and osteotomies in proximal femur long leg spica casts are a torture to patients and caregivers. Methods By experience in different surgical procedures in usage of the Fassier-Duval nailing system a technical solution for rotational stability of the nail as well as for locking of the nail in the proximal and distal physis could be developed. Results A transverse slot can be cutted in all available diameters of the female parts to make the FD nail rotationally stable. A proximal locking hole can be drilled individually by the surgeon on the operating table. The technical solution to the problems is presented in two exemplary cases in this article.Conclusions Rotational stability and additional proximal locking options can be achieved by additionally individualization of the Fassier-Duval telescoping nail during surgery.

Individualized Implant: A surgical advice for rotational stability and additional proximal locking of the Fassier-Duval telescoping nail

Background When stabilizing fractures and osteotomies in growing patients with special conditions of the long bones, the use of the Fassier-Duval nail as intended by the manufacturer (Pega Medical, Quebec, Canada) [1], shows that one problem with passive telescopic nails has not yet been solved. No stability in the rotation can be achieved. Postoperative to immobilize with plaster casts are obsolete in patients with osteogenesis imperfecta, as additional osteopenia due to immobilization must be feared. Especially with fractures and osteotomies in proximal femur long leg spica casts are a torture to patients and caregivers.Methods By experience in different surgical procedures in usage of the Fassier-Duval nailing system a technical solution for rotational stability of the nail as well as for locking of the nail in the proximal and distal physis could be developed.Results A transverse slot can be cutted in all available diameters of the female parts to make the FD nail rotationally stable. A proximal locking hole can be drilled individually by the surgeon on the operating table. The technical solution to the problems is presented in two exemplary cases in this article.Conclusions Rotational stability and additional proximal locking options can be achieved by additionally individualization of the Fassier-Duval telescoping nail during surgery.