Tunnel Technique Research Articles

Optoelectronic performance prediction of HgCdTe homojunction photodetector in long wave infrared spectral region using traditional simulations and machine learning models.

This research explores the design of an infrared (IR) photodetector using mercury cadmium telluride (Hg1-xCdxTe). It proposes two- and three-dimensional homojunction models based on p+-Hg0.7783Cd0.2217Te/n--Hg0.7783Cd0.2217Te, focusing on applications in the long-wavelength infrared range. The photodetector's performance is analyzed using Silvaco ATLAS TCAD software and compared with analytical calculations based on drift-diffusion, tunneling, and Chu's approximation techniques. Optimized for operation at 10.6μm wavelength under liquid nitrogen temperature, the proposed photodetector demonstrates promising optoelectronic characteristics including the dark current density of 0.20mA/cm2, photocurrent density of 4.98A/cm2, and photocurrent density-to-dark current density ratio of 2.46 × 104, a 3-dB cut-off frequency of 104GHz, a rise time of 0.8 ps, quantum efficiency of 58.30%, peak photocurrent responsivity of 4.98A/W, specific detectivity of 3.96 × 1011cmHz1/2/W, and noise equivalent power of 2.52 × 10-16W/Hz1/2 indicating its potential for low-noise, high-frequency and fast-switching applications. The study also incorporates machine learning regression models to validate simulation results and provide a predictive framework for performance optimization, evaluating these models using various statistical metrics. This comprehensive approach demonstrates the synergy between advanced materials science and computational techniques in developing next-generation optoelectronic devices. By combining theoretical modeling, simulation, and machine learning, the research highlights the potential to accelerate progress in IR detection technology and enhance device performance and efficiency. This multidisciplinary methodology could serve as a model for future studies in optoelectronics, illustrating how advanced materials and computational methods can be utilized to enhance device capabilities.

Tunnel Technique and Subepithelial Connective Tissue Graft, With or Without Cross-Linked Hyaluronic Acid, in the Treatment of Multiple Gingival Recessions: Prognostic Parameters for Clinical Treatment Outcomes of Randomized Controlled Trial

Objectives: This study aimed to investigate factors that influence the 12-month outcomes after the treatment of multiple gingival recessions (GRs) with a modified coronally advanced tunnel (MCAT) and a subepithelial connective tissue graft (SCTG), with cross-linked hyaluronic acid (HA, tests) or without (controls). Materials and Methods: Twenty-four patients with 266 GRs were treated. A logistic regression model was set to identify the baseline parameters that could predict the 12-month outcomes. The study protocol was registered at ClinicalTrials.gov (ID No. NCT05045586). Results: The evaluated clinical and esthetic parameters showed marked improvement in both groups without any statistically significant differences between the groups, with the exception of the soft tissue texture (STT). The STT was in favor of the HA group (0.96 versus 0.73, p = 0.0091). The likelihood of an MRC > 85%, of achieving CRC, and of gaining an RES = 10 was the highest for the incisors (reference group) and the lowest for the molars (OR = 0.046, p = 0.005). With each 1 mm increase in the baseline clinical attachment level, the odds of failure (MRC < 85%, not achieving CRC) increased, whereas each 1 mm increase in the baseline keratinized tissue width (KTW) improved the chances of an MRC > 85%, of achieving CRC, and of gaining an RES = 10. The application of HA increased the likelihood of a perfect RES more than twofold (OR = 2.683, p = 0.001). Conclusions: The application of HA improved the 12-month esthetic outcomes after the treatment of GRs with the MCAT technique. The baseline CAL, KTW, and tooth type predicted the 12-month MRC, CRC, and RES. An evaluation of the baseline characteristics of the surgical area might help clinicians develop individualized treatment plans.

Anti-reflux uretero-ileal anastomosis for orthotopic ileal neobladder using Wallace technique in a single trough.

To evaluate the modification of the subserous extramural tunnel for non-refluxing uretero-ileal anastomosis in U - shaped pouches using the Wallace technique with a single trough. This prospective study was conducted from 2017 to 2022 in a single tertiary center after approval from the research ethics committee of our institution (approval number: FWA 000017585). 45 patients' candidates for radical cystectomy and orthotopic urinary diversion were included in this study. The patients were diverted using a U-shaped pouch with uretero-ileal anastomosis, combining the extramural serous-lined tunnel and Wallace techniques in a single trough. Operative time and complications, including ureteric obstruction, reflux, and renal function, were recorded within one year. The modified uretero-ileal anastomosis combined with the extramural serous-lined tunnel and Wallace techniques had a relatively short operative time (mean 132.2 ± 18.3 min) and short bowel segment incorporation (30 cm). In 43 patients, vesicoureteral reflux (VUR) occurred in only two patients (4.7%). One case of anastomotic stricture was diagnosed (2.3%), which increased to two cases (4.7%) after one year. Three patients (7%) developed pyelonephritis during the year. The mean serum creatinine level of the patients before the operation was 1.2 mg/dl, which increased to 1.4 mg /dl 6 months postoperatively. A modification of the subserous extramural tunnel for non-refluxing uretero-ileal anastomosis in U-shaped pouch appears to be a good simple alternative that is less time consuming and using a shorter segment of bowel for orthotopic diversion with a comparable complication rate.

Digital workflow to assess gingival recession coverage independently of the cemento-enamel Junction: a prospective clinical study using the modified coronally advanced tunnel technique with porcine dermal matrix

ObjectivesThe limited number of studies using digital workflows to measure soft tissue changes depend on the cemento-enamel junction (CEJ), which has been reported to be unreliable. Our primary objective was to apply an advanced digital assessment method, measuring independent from the CEJ to evaluate the modified coronally advanced tunnel technique (MCAT) with a porcine dermal matrix (PDM) for gingival recession coverage.Materials and methodsPatients with type RT1 and RT2 gingival recessions were treated with the MCAT and a PDM. Plaster casts (preoperative and 6 months postoperative) were digitalized. Subsequent stereolithography (STL)-files were imported and superimposed in the open-source software GOM Inspect for computer-based analysis. Recession depth, mean root and complete root coverage (mRC and cRC), mean recession reduction (mRR) and gingival thickness were evaluated. Statistical analysis was performed using mixed linear models.ResultsA total of 82 teeth (19 patients) were included in the study. Healing was uneventful in all patients. The mean preoperative recession depth was 1.34 ± 0.92 mm. mRC was 65.06 ± 48.26%, cRC was 25.61%, mRR was 0.87 ± 0.83 mm, and gingival thickness gain was 0.33 ± 0.30 mm, with comparable results for RT1 and RT2. Neither tooth type nor type of jaw had any effect on the amount of root coverage.ConclusionsThe digital evaluation workflow employed offers an approach to evaluate gingival recession coverage outcomes independent of the CEJ. The PDM used in combination with the MCAT shows promising results for root coverage.

Root Coverage Techniques: Coronally Advancement Flap vs. Tunnel Technique: A Systematic Review and Meta-Analysis

Introduction: Gingival recession, characterized by the apical displacement of the gingival margin, presents challenges to oral health. This study compares the effectiveness of the coronally advanced flap (CAF) and the tunnel technique (TT) for treating gingival recessions. Methods: Bibliographical searches included PubMed, Embase, Web of Science, Cochrane, Scopus, and the grey literature, with keywords “root coverage” “coronary advanced flap”, and “tunnel”. A systematic coreview was performed that included 26 studies evaluating root coverage, and 14 articles were included for the meta-analysis. Three groups were analyzed: Group 1 compared TT with connective tissue graft (CTG) versus CAF with CTG; Group 2 examined TT with CTG and/or other biomaterials versus TT with CTG alone; Group 3 compared TT with CAF, regardless of complementary biomaterials. Meta-analysis assessed mean root coverage (MRC), complete root coverage (CRC), and keratinized tissue gain (KTG). Results: In Group 1, TT with CTG demonstrated superior MRC compared with CAF with CTG (−8.68 CI95% −17.19 to −0.17; p = 0.0457). In Group 2, TT with CTG and/or other biomaterials showed similar MRC (4.17 CI95% −17.91 to 26.26; p = 0.7110) and CRC (0.37 CI95% −1.14 to 1.89; p = 0.6269) to TT with CTG alone, with variations in keratinized tissue gain. Group 3 indicated higher potential MRC for TT compared with CAF (5.73 CI95% −8.90 to 13.55; p = 0.685) but without statistically significant differences. Conclusions: This study suggests that TT with CTG might offer better root coverage than CAF with CTG; however, biomaterial selection requires consideration.

Efficacy and feasibility of tunnel esophagogastrostomy to perform proximal gastrectomy

Objective: To analyze the efficacy and feasibility of performing a new surgical procedure, tunnel esophagogastrostomy, to perform proximal gastrectomy. Methods: The study cohort comprised 10 consecutive patients who had undergone esophagogastrostomy by the tunnel technique in Jiangsu Cancer Hospital between October 2019 and July 2022. All patients were male. Their average age was (64.2±8.1) years and body mass index (25.5±3.2) kg/m2. Nine had upper gastric body adenocarcinoma, the remaining one having signet ring cell carcinoma. TNM staging of the tumors showed that seven were Stage IA, one Stage IB, one Stage IIA, and one Stage IIIA. Briefly, tunnel esophagogastrostomy is performed as follows: After performing a proximal gastrectomy, a rectangular seromuscular flap (3.0 cm × 3.5 cm) is created. The posterior esophageal wall is sutured to the gastric wall at the orad end of the seromuscular flap 5 cm from the stump with three to four stitches. Next, the stump of the esophagus is opened, the posterior esophageal wall is sutured to the gastric mucosa and submucosa, and the anterior esophageal wall is sutured to the full layer of the stomach. Finally, the caudad end of the seromuscular flap is closed. Data on surgical safety, postoperative morbidity, and postoperative reflux esophagitis were analyzed. All enrolled patients completed endoscopic follow-up 1 year and 2 years after surgery. Results: All procedures were completed. They comprised four cases of laparoscopic assisted surgery, four of DaVinci robotic surgery, and two of open surgery. The mean operation time was 212.7±33.2 mins, mean anastomosis time (51.6±5.3) minutes, mean tunnel preparation time (20.0±3.5) minutes, and mean operative blood loss (90.0±51.6) mL. The time to first postoperative passage of flatus was (64.8±11.5) hours. The mean hospital stay after surgery was (9.2±1.7) days. There were no postoperative complications above Clavien-Dindo Grade II. The mean preoperative Reflux Disease Questionnaire score was (3.3± 0.4) before the surgery, (3.8±1.0) 1 month postoperatively, and (3.3±0.4) 12 months postoperatively. All patients underwent endoscopic follow-up; no anastomotic stenoses were found. However, one patient had Grade A reflux esophagitis 1 year after surgery and another Grade B reflux esophagitis 2 years after surgery. Conclusion: Esophagogastrostomy by the tunnel technique is a safe and feasible means of performing proximal gastrectomy.

Safety and complications associated with tunneling and pseudotunneling techniques during PICC and Midline insertion.

Peripherally Inserted Central Catheters and Midline Catheters are particularly attractive because of their favorable risk/benefit ratio. If the ideal venipuncture site is in an area inappropriate for catheter emergence, a valid alternative is the tunneling technique, which allows the exit site to be moved to reach the optimal position. There are two main types of tunneling techniques: standard tunnel, using a tunneling device (metal tunneler or peel-away tunneler), and pseudo-tunnel. As much as both are recognized as appropriate and safe, there are still few literature data indicating the criteria for choosing and using the two techniques and the possible related complications. This retrospective observational investigation analyzed data regarding intra- and post-procedural complications of tunneled catheters inserted using two different techniques. The sample was stratified into three subgroups: (1) Standard Tunnel (patients with no PLT or INR disorders), (2) Pseudotunnel (patients with no PLT or INR disorders), and (3) Pseudotunnel (patients with any PLT or INR disorder). Data regarding the procedure, at 24 h and 7 days were collected and analyzed. A total of 143 patients who underwent tunneled catheter insertion were included in the study. Among these, 113 patients were divided into subgroups 1 and 2 and 30 were assigned to subgroup 3. No significant differences were found among the three subgroups regarding immediate, short, and medium-term tunnel complications. The findings of this study suggest that both standard and pseudo-tunnels provide comparable levels of safety and comfort for patients. It was noted that Pseudotunnel offers an equivalent level of safety for patients with coagulation disorders related to PLT and INR, rendering it comparable to a "minimally invasive procedure," which necessitates the same precautions as a non-tunneled PICC.

Comparison of a full tibial tunnel or an all-inside technique for anterior cruciate ligament reconstruction: An observational study.

This study aims to compare the effectiveness of anterior cruciate ligament (ACL) reconstruction performed with either a full tibial tunnel technique or an all-inside technique. Data from patients with ACL rupture who underwent ACL reconstruction using autogenous hamstring tendon grafts between January 2019 and July 2021 were retrospectively reviewed. Patients were followed up for a minimum of 24 months. Preoperative and postoperative International Knee Documentation Committee scores, Lysholm knee scores, visual analog scale pain scores, Tegner activity scale scores, C-reactive protein levels, erythrocyte sedimentation rate, white blood cell (WBC) count, D-dimer levels, and neutrophils were recorded. At the final follow-up, side-to-side differences were assessed with the pivot shift test, Lachman test, anterior drawer test, and a knee laxity-testing device. This study included 135 patients with ACL rupture, with 62 patients (43 males and 19 females, mean age: 34.42 ± 12.79 years) undergoing the full tibial tunnel technique, and 73 patients (58 males and 15 females, mean age: 32.41 ± 11.01 years) undergoing the all-inside techniques (AITs). There were no significant differences in postoperative International Knee Documentation Committee scores, Lysholm knee scores, or Tegner activity scale scores, except at postoperative 6 months. visual analog scale pain scores showed significant improvement in patients that underwent the AIT compared to the full tibial tunnel technique at postoperative 1 week, 2 weeks, and 1 month; however, there were no significant differences at postoperative 3, 6, 12, 18, and 24 months. C-reactive protein levels, erythrocyte sedimentation rate, WBC count, D-dimer levels, and neutrophils were significantly lower in patients that underwent the AIT compared to the full tibial tunnel technique at postoperative 1 month, but there were no other significant differences in these outcome measures, except for WBC count at postoperative 3 months. There was no significant difference in knee stability at the last follow-up. In ACL reconstruction, functional outcomes following the AIT are satisfactory and similar to the total tibial tunnel technique, but patients experience less pain and a reduced early postoperative inflammatory response. These results highlight the promising potential of AITs in the clinical management of ACL rupture and advocate for their widespread adoption.

Strategies for Preventing Tunnel Convergence in Multiligament Knee Injury Reconstructions.

Multiligament knee injuries (MLKIs) are complex and heterogeneous, often associated with concomitant injuries, and necessitates precise treatment strategies. Effective preoperative management in MLKIs requires comprehensive evaluation, starting with a detailed patient history to identify the mechanisms of injury and prior treatments. Physical examination assesses for knee stability, while imaging techniques including magnetic resonance imaging (MRI) and radiographs detail ligament, cartilage, and meniscal injuries to identify all injured structures. Vascular evaluations are critical given the high risk of concomitant neurovascular injuries especially in dislocated knees, bicruciate injuries, and lateral-sided injuries. Anatomic reconstruction of the torn ligaments has been biomechanically and clinically validated to improve knee stability and function. When performing multiple anatomic reconstructions, the risk of tunnel convergence is high. Therefore, surgical intervention aimed at optimizing outcomes necessitates careful planning to avoid tunnel convergence. This involves strategic tunnel placement, orientation, and techniques, such as adjusting tunnel angulation and using intraoperative imaging. These measures are vital for restoring knee functionality and minimizing future complications. Managing tunnel convergence is vital in treating MLKIs. Avoiding convergence on the medial side of the femur and tibia is more challenging due to the number of tunnels. In an MLKI involving all ligaments, 4 femoral tunnels and 4 tibial tunnels are required on the medial side, compared to 3 on the femur and 1 on the tibia for the lateral side, respectively. The successof a multiligament knee reconstruction depends on a precise diagnosis, thorough preoperative management, and strategic tunnel placement. A multidisciplinary approach not only enhances surgical outcomes, but also ensures long-term improvement in knee function, effectively addressing the complexities and risks associated with these injuries.

Anterior and coracoid base tunnel location combined with single -or double clavicular tunnel techniques using double-button fixation for coracoclavicular ligament reconstruction both restore horizontal stability. A biomechanical cadaver study

BackgroundThe placement of clavicle tunnels in coracoclavicular ligament reconstruction is well established, but the optimal position of the coracoid tunnel remains unclear. This study aimed to investigate how the coracoid tunnel's position affects horizontal stability during coracoclavicular ligament reconstruction using a double-button technique. MethodsFifteen fresh frozen shoulder cadaver specimens were tested under various conditions: intact coracoclavicular ligaments, disrupted ligaments, and reconstructions with a single coracoid and clavicle tunnel or double clavicle tunnels. The coracoid tunnel was positioned at the coracoid base 1/9, and 1/5 anterior to the base. Specimens underwent displacement-controlled loading, with 2D motion analysis conducted on captured digital images using TEMA motion analysis. FindingsMean displacement for intact coracoclavicular ligaments was 1.61 ± 0.92 mm, and 3.69 ± 1.09 mm for disrupted ligaments. For reconstructed conditions, displacements were as follows: Single-Tunnel Base (1.87 ± 0.64 mm), Single-Tunnel 1/9 (2.54 ± 1.13 mm), Single-Tunnel 1/5 (2.62 ± 1.17 mm), Double-Tunnel Base (1.25 ± 0.73 mm), Double-Tunnel 1/9 (2.03 ± 1.22 mm), and Double-Tunnel 1/5 (1.88 ± 1.20 mm). Differences among intact, reconstructed, and disrupted states were statistically significant (p = 0.01–0.0001), with all reconstruction techniques restoring horizontal displacement near the intact state. InterpretationAt point zero both single coracoid tunnel and single- and double-clavicle tunnel restored horizontal displacement to its intact state. Coracoid tunnel placement anterior to the base of the coracoid did not influence horizontal displacement but single coracoid at the coracoid base and single clavicle tunnel resulted in the most anatomic reconstruction. Single coracoid tunnel at the base and double-clavicle resulted in the most stable reconstruction.

Evaluation of retear rates following transtibial anterior cruciate ligament reconstruction: Functional outcomes and GNRB assessment with a mean 6.3-year follow-up

The method of reconstruction of the anterior cruciate ligament (ACL) using the tibia-dependent femoral tunnel technique is highly criticized. It would not allow anatomical placement of the graft and would therefore lead to a high rate of retear. This retrospective study aimed to evaluate the rate of retear in ACL reconstructions using the transtibial tunnel (TT) technique and assess functional outcomes. The study included 148 patients (153 knees) who underwent ACL reconstruction with a minimum two-year follow-up period. Patients underwent clinical examinations, completed functional questionnaires (KOOS, Lysholm, ACL-RSI), and underwent laximetry measurements with GNRB at 134 N and 200 N. Two patients had retears detected on MRI and underwent revision surgery prior to the study, leaving 151 knees for evaluation. The retear rate was 6.6 %, with an overall rate of 7.8 % when including revision cases. Laxity measurements obtained with GNRB showed a strong correlation with functional scores, indicating worse scores with greater laxity differences (p < 0.0001). The retear rate observed in this study was at the higher end of those reported in the literature. The study indications for TT ACL reconstructions must be defined more specifically to reduce failure rates.Level of evidence: III (retrospective cohort study).

Mast Cells Mediate Acute Inflammatory Responses After Glenoid Labral Tears and Can Be Inhibited With Cromolyn in a Rat Model

Background: Injuries to the glenoid labrum have been recognized as a source of joint pain and discomfort, which may be associated with the inflammatory responses that lead to the deterioration of labral tissue. However, it is unclear whether the torn labrum prompts mast cell (MC) activation, resulting in synovial inflammatory responses that lead to labral tissue degeneration. Purpose: To determine the potential influence of activated MC on synovial inflammatory responses and subsequent labral tissue degeneration and shoulder function deterioration in a rat model by monitoring MC behavior and sequential inflammatory responses within the synovial tissue and labral tissue after injury, suture repair, and MC stabilizer administration. Study Design: Controlled laboratory study. Methods: Anteroinferior glenoid labral tears were generated in the right shoulder of rats (n = 20) and repaired using a tunneled suture technique. Synovial tissue inflammatory responses were modulated in some rats with intraperitoneal administration of an MC stabilizer—cromolyn (n = 10). At weeks 1 and 3, MC activation, synovial inflammatory responses, and labral degeneration were histologically evaluated. Simultaneously, gait analysis was performed before and after surgical repair to assess the worsening of the shoulder function after the injury and treatment. Results: Resident MC degranulation after labral injury (50.48% ± 8.23% activated at week 1) contributed to the initiation of synovial tissue inflammatory cell recruitment, inflammatory product release, matrix metalloproteinase-13, and subsequent labral tissue extracellular matrix degeneration. The administration of cromolyn, an MC stabilizer, was found to significantly diminish injury-mediated inflammatory responses (inflammatory cell infiltration and subsequent proinflammatory product secretion) and improve shoulder functional recovery. Conclusion: MC activation is responsible for labral tear–associated synovial inflammation and labral degeneration. The administration of cromolyn can significantly diminish the cascade of inflammatory reactions after labral injury. Clinical Relevance: Our findings support the concept that MC stabilizers may be used as a complementary therapeutic option in the treatment and repair of labral tears.

Use of double short tandem scleral tunnels for repairing eroded ahmed glaucoma valve tubes

PurposeTo evaluate the effectiveness and safety of a method for repairing an eroded Ahmed glaucoma valve (AGV) tube using two short scleral tunnels made in tandem with a 22G needle instead of covering the eroded tube with another scleral graft.MethodsFrom May 12, 2015, to July 27, 2019, we retrospectively reviewed eight patients at Ningbo Aier Eye Hospital who developed AGV tube erosion secondary to necrosis of their overlying conjunctiva and scleral grafts. This defect was repaired in all the patients using the double short tandem scleral tunnel technique, which involved the creation of double short tandem scleral tunnels made by a 22G needle. Two parallel-to-limbus scleral incisions were made 3 mm and 6 mm from the limbus first, then a curved 22G needle was inserted between the two scleral cuts to make one scleral tunnel, the other scleral tunnel was completed during the first surgery, inserted the tube into the two tunnels. The mean length of time between the AGV placement and the first erosion was 12.25 ± 6.36 months (3–24 months). The mean age of the patients was 65.50 ± 11.70 years (49–78 years).ResultsThe surgical outcome was assessed in terms of the tectonic integrity of the conjunctiva over the follow-up period (12 months). There was no AGV tube erosion, scleral thinning, or ocular infection after a mean of 41.25 ± 26.54 months of follow-up in all eight patients.ConclusionAGV tube erosion following shunt surgery can be successfully managed using the improved double short tandem scleral tunnel technique.

Combined use of coronally positioned flap and tunnel technique

Combined use of coronally positioned flap and tunnel technique

Partial-Full-Thickness Tunnel Technique and Supra-Crestal Sling Suture for Treatment of RT2 and RT3 Gingival Recessions: Technical Report with Two Cases.

The purpose of this technical report is to describe a modified tunnel surgical approach and connective tissue graft (CTG) stabilization technique for the treatment of gingival recessions with interproximal clinical attachment loss (ICAL). The partial-full-thickness (PFT) tunnel technique utilizes multiple vestibular incisions to facilitate creation of a split-mucoperiosteal tunnel that enhances tissue passivity and allows for coronal advancement of soft tissue with minimal tension. The supra-crestal sling (SCS) suture engages only the CTG, independent of the overlying tissue and stabilizes the CTG around the buccal and proximal root surfaces. The treatment approach of PFT tunnel preparation and CTG stabilization with the SCS suture was designed to optimize blood supply and maximize wound stability, resulting in complete root coverage with satisfactory clinical outcomes in RT2 and RT3 gingival recession. It is suggested that the PFT tunnel preparation with graft stabilization via the SCS suture has the potential to treat recessions with anatomical limitations associated with ICAL.

Tunnel Technique at Isolated Gingival Recession: A Case Report

Tunnel Technique at Isolated Gingival Recession: A Case Report

Silicone sling surgery for congenital ptosis: Tarsal tunnel technique.

This was a prospective, interventional, comparative study conducted on patients with congenital simple severe ptosis. A novel method of silicone rod fixation to the tarsus (tarsal tunnel technique, group 1) was done compared with a conventional technique of silicone rod fixation (suture fixation technique, group 2) in frontalis suspension surgery. A total of 30 patients were randomized into two groups of 15 patients each. Postoperatively, MRD1, vertical palpebral aperture, and eyelid fold height were comparable in both groups till the last follow-up with stability in eyelid position. Patient satisfaction scores showed similar results with good-fair satisfaction grading in 13 patients in group 1 and 11 patients in group 2 at 6 months follow-up. No significant complications occurred in either group. Tarsal tunnel fixation of silicone rods is a novel method in sling surgery with optimal cosmetic and function outcomes. Further long-term studies are needed to validate the results of the technique.

S1512 Third Space Tunneling Techniques Versus Non-Tunneled Flexible Endoscopic Septostomy for the Treatment of Zenker’s Diverticulum: A Comparison of Technicality, Safety, and Efficacy

S1512 Third Space Tunneling Techniques Versus Non-Tunneled Flexible Endoscopic Septostomy for the Treatment of Zenker’s Diverticulum: A Comparison of Technicality, Safety, and Efficacy

A VERY LOW BANDGAP LINE-TUNNEL FIELD EFFECT TRANSISTOR WITH CHANNEL-BURIED OXIDE AND LATERALLY DOPED POCKET

Low bandgap and line tunneling techniques have demonstrated the most effectiveness in enhancing the on-current of tunnel field-effect transistors (TFETs). This study examines the mechanisms and designs of channel-buried oxide and a laterally doped pocket for a very low bandgap line-TFET. Numerical TCAD simulations show that the channel-buried oxide is needed to prevent off-state lateral tunneling while still maintaining the on-state vertical tunneling. The buried oxide pillar should be high so that the channel is thin, about 10 nm thick, to completely suppress the tunneling leakage. The dopant pocket is required to trigger the line tunneling earlier than the point tunneling to improve the subthreshold swing and on-current. Increasing the pocket concentration or decreasing the pocket thickness both cause an increase not only in the vertical band bending but also in the effective gate-insulator thickness. Because of the trade-off between these two operation parameters, for a given thickness/concentration, there exists an optimal concentration/thickness of the pocket to maximize the on-current. The on-current is optimized using a heavy, thin pocket, for which the band bending is maximized and the effective gate-insulator thickness is minimized. For the fabrication feasibility using existing doping techniques, the pocket concentration and thickness should be 1019 cm-3 and 4 nm, respectively, to maximize the on-current of the InAs line-TFET.

Treatment of gingival recession using connective tissue and modified tunnel technique:a case report

Treatment of gingival recession using connective tissue and modified tunnel technique:a case report