[Application of polyetheretherketone rod semi-rigid pedicle screw internal fixation in lumbar non-fusion surgery].

Objective: To investigate the effect of Polyetheretherketone (PEEK) rod semi-rigid pedicle screw fixation system in lumbar spine non-fusion surgery.

Methods: A total of 74 patients with tow-level lumbar degenerative diseases who underwent surgery from March 2017 to December 2019 were divided into PEEK rod group and titanium rod group. In the PEEK rod group, there were 34 patients, including 13 males and 21 females, aged from 51 to 79 years old with an average of (62.

Special congenital dacryocystocele.

Congenital Dacryocystocele is a rare disease of the eye and nose, which originates from congenital obstruction of lacrimal duct system, but accounts for a low proportion in congenital obstruction of lacrimal duct system. We present a case of congenital dacryocystocele to analyze the clinical features and to explore the clinical treatment effect of special congenital dacryocyst protrusion.

Using the cobweb classification system as a digital location system for the neurologic compression in cervical degenerative disease.

Objective: To provide the cobweb classification system (CCS) for the precise digital location and description of the neurological compression in cervical degenerative disease (CDD), and the reliability and the clinical subgroup analysis of the system were tested and analyzed.

Methods: The CCS consisted of three parts: compression zones (-), degrees (, ) and ossification (, , ). Computerized tomography (CT) and magnetic resonance imaging (MRI) images from 238 CDD patients were reviewed.

[Application of perfusion bone cement screw in lumbar degenerative disease with osteoporosis].

Objective: To observe the early clinical effect of perfusion bone cement screw for lumbar degenerative diseases with osteoporosis.

Methods: The clinical data of 28 patients with lumbar degenerative diseases combined with moderate to severe osteoporosis treated by posterior lateral graft fusion with perfusion of bone cement screws from June 2015 to June 2017 were retrospectively analyzed. There were 9 males and 19 females, aged from 55 to 86 years old with an average of 76 years.

Comparison of 2-year follow-up results of the hybrid surgery using Mobi-C combined with ROI-C and anterior cervical discectomy and fusion for the treatment of contiguous two-level cervical degenerative disc diseases.

Although the Mobi-C artificial disc and the ROI-C cervical cage have been widely used in the treatment of cervical degenerative disc diseases (CDDD), few reports addressed the features of combined application of both devices. This study is aimed at comparing the clinical and radiological outcomes of treating contiguous two-level CDDD using Mobi-C and ROI-C combined in a hybrid surgery (HS) with anterior cervical discectomy and fusion (ACDF) using ROI-C. We reviewed ninety-one patients who underwent HS (n = 48) or ACDF (n = 43) surgery for symptomatic contiguous two-level CDDD.

Nanosecond square high voltage pulse generator for electro-optic switch.

A scalable square high voltage pulse generator, which has the properties of fast rise time, fast fall time, powerful driving capability, and long lifetime, is presented in this paper by utilizing solid state circuitry. A totem-pole topology is designed to supply a powerful driving capability for the electro-optic (EO) crystal which is of capacitive load. Power MOSFETs are configured in series to sustain high voltage, and proper driving circuits are introduced for the specific MOSFETs configurations.

[Construction effect of fertile cultivated layer in black soil].

The clayey farmland soil in black soil region of Northeast China, due to the existence of thicker plough pan created by unreasonable tillage, is a main limiting factor for local agricultural production. In this paper, a field experiment was conducted to study the construction effect of fertile cultivated layer on crop yield, soil physical properties, soil moisture content, and soil microbial number. After the construction of fertile cultivated layer, the soil had a thicker cultivated layer, and the crop yield was increased.