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PubMed1984

A dynamic biomechanical evaluation of lifting maximum acceptable loads.

A biomechanical evaluation of the job-related stresses imposed upon a worker is a potential means of reducing the high incidence rates of manual material handling injuries in industry. A biomechanical model consisting of seven rigid links joined at six articulations has been developed for this purpose. Using data from cinematographic analysis of lifting motions the model calculates: (1) body position from articulation angles, (2) angular velocities and accelerations, (3) inertial moments and forces, and (4) reactive moments and forces at each articulation, including the L5/S1 joint. Results indicated effects of the common task variables. Larger load and box sizes increased the rise times and peak values of both vertical ground reaction forces and predicted L5/S1 compressive forces. However, boxes with handles resulted in higher L5/S1 compressive forces than for boxes without handles. Also, in lifting the larger boxes the subjects did not sufficiently compensate with reduced box weights in order to maintain uniform L5/S1 compressive forces. Smoothed and rectified EMG of erector spinae muscles correlated significantly with L5/S1 compressive forces, while predicted and measured vertical ground reaction forces also correlated significantly, indicating the validity of the model as a tool for predicting job physical stresses.

Humans↗
PubMed1979

Palatal lift prostheses for treatment of palatopharyngeal incompetence.

It appears that the palatal lift prosthesis is an effective prosthesis to improve palatopharyngeal incompetence in selected patients. Despite the inconvenience and problems associated with a prosthesis, this procedure is indicated for selected patients who have anatomically normal palates that are dysfunctional. The ultimate benefit of the palatal lift prostheses to the speech of the patients is not the subject of this report. However, it should be noted that many patients can benefit from speech therapy after a satisfactory prosthetic result has been achieved.

Acrylic Resins↗
PubMed1994

Technique for stabilization of autogenous cancellous bone grafts in sinus lift procedures.

Densely packed autogenous cancellous bone was stabilized in a sinus lift procedure with cortical cancellous struts. These struts were placed above the cancellous bone and rigidly fixed to the buttress and anterior sinus wall with titanium screws. This technique enables the clinician to maintain and stabilize bone graft materials in sinus lift procedures.

Bone Screws↗
PubMed1982

Effects of central nervous system lesions on leg lift learning in the cockroach, P. americana.

When headless and intact cockroaches were trained to keep their prothoracic legs flexed to avoid electric shock, headless animals reached an asymptote more quickly than intact animals. Three behavioral measures were examined for experimental and yoked control animals to analyze differences between headless and intact animals. When cycloheximide (CXM) was injected before leg lift training, cycloheximide-injected headless animals reached an asymptote more slowly than control headless animals. However, cycloheximide did not impair leg lift learning in intact animals.

Animals↗
PubMed1991

Prime mover muscle in finger lift or finger flexion reaction times: identification with transcranial magnetic stimulation.

When recording the onset of the electromyographic (EMG) voluntary response in reaction time (RT) studies, the electrodes should be placed on the muscle which is first and foremost involved in executing the response. It is thus necessary to identify which is the prime mover muscle among active synergic muscles. This has been investigated for index finger lift or flexion RTs by delivering a magnetic stimulus to motor cortical areas prior to the subject's voluntary response. The EMG responses to the magnetic stimulus were selectively facilitated either in the extensor indicis proprius muscle (in index lift RTs) or in the first dorsal interosseous muscle (in index flexion RTs). These effects are robust and provide a method for identifying the prime mover muscle in voluntary movements.

Adult↗
PubMed2004

Maximizing aesthetics in lateral-tension abdominoplasty and body lifts.

The high-lateral-tension abdominoplasty addresses the practical and theoretic faults of standard abdominoplasty design. Key features include limited direct undermining, increased lateral skin resection with highest-tension wound closure along lateral limbs, two-layer superficial fascial system repair, and significant truncal liposuction when needed. The high-lateral-tension design limits the unfavorable features of standard abdominoplasty and produces balanced natural aesthetic contours. The high-lateral-tension abdominoplasty is the foundation for treatment of more generalized relaxation problems in the circumferential trunk and thighs. For more significant thigh laxity and buttock ptosis, the lateral-tension abdominoplasty is combined with the transverse thigh/buttock lift to produce the lower body lift #2.

Abdominal Wall↗
PubMed2004

The adjustable vector deep plane midface lift.

Midface lifting is valuable rejuvenative options for many patients and can provide a more youthful and balanced face. This procedure is well suited for the oral and maxillofacial surgeon because of familiarity with the intraoral and temporal surgical approaches, and it does not require any specialized equipment. This procedure has minimal postoperative recovery and a low complication rate. The results of this procedure have remained stable in the author's cohort of patients approaching 2 years. Contraindications include atrophic or minimal malar fat, in which case there is nothing to elevate. The midface lift can be performed as an isolated procedure or as part of multiple facial procedures. The astute surgeon considers midface rejuvenation in all cosmetic cases.

Adipose Tissue↗
PubMed2005

Sternum lifting technique for thoracoscopic internal thoracic artery harvest.

We employed the Laparolift and Laparofan (Origin Medsystems Inc., CA, USA) and developed a sternum lifting technique to create a sufficient intra-pleural space between the heart and the sternum in which the left internal thoracic artery (ITA) in situ graft could be thoracoscopically mobilized. Between June and December 2004, this technique was applied to 12 consecutive patients (eight men, four women, aged 68.5+/-9.6 years) undergoing minimally invasive coronary artery bypass grafting via a left mini-thoracotomy. The Laparofan, connected to the arm of the lift machine (Laparolift), was introduced through a subxyphoidal entry and opened beneath the sternum. The sternum was elevated by about 5 cm until a sufficient working space was created under the sternum. With left hemipulmonary collapse, the left ITA was thoracoscopically taken down through the axillary ports. There was no procedural conversion to direct harvesting. The mean thoracoscopic harvesting time was 34.5+/-7.7 min. There was no mortality and no instrument-related morbidities. Patency of each ITA graft was angiographically confirmed. In conclusion, despite the limited experience, the present sternum elevation technique using the Laparolift system is a viable method for increasing the intra-pleural working space beneath the sternum during thoracoscopic ITA harvesting.

Aged↗
PubMed2005

Deep plane face-lift.

The deep plane face-lift is a safe and reliable technique for treatment of the aging face. It affords improvement in the lower face and midface. The use of fibrin glue in the face-lift has improved the healing and recovery of patients.

Aging↗
PubMed2004

Stability of the ANAMMOX process in a gas-lift reactor and a SBR.

In the last years, the ANAerobic AMMonium OXidation (ANAMMOX) process has been put forward as a promising alternative to treat ammonium rich wastewaters. An ANAMMOX gas-lift reactor and a sequential batch reactor (SBR) were operated during around 200 days in this study, reaching nitrogen loading rates (NLRs) of 2.0 and 0.75 g l(-1) per day, respectively. The efficiency in the nitrite (limiting substrate) removal was 99%. The ammonium and nitrite influent concentrations were increased stepwise until biomass in the reactors started to float. These flotation events coincided with periods when the NLR exceeded the maximum specific ANAMMOX activity (MSAA) of the sludge. The MSAA, determined in batch experiments, was 0.9 and 0.44 g g(-1) per day for biomasses from the gas-lift reactor and the SBR, respectively. Flotation of the biomass occurred most likely due to a granule density decrease caused by dinitrogen gas accumulation inside the granules and an apparent breakage of the granules. Further research is needed to understand this phenomenon and to optimise the corresponding strategies to counteract the flotation.

Bacteria, Anaerobic↗
PubMed2006

Cyanoacrylate adhesive for closing sinus membrane perforations during sinus lifts.

INTRODUCTION: Sinus lift procedures depend greatly on fragile structures and anatomical variations. The procedure may cause sinus membrane perforations, which can lead to graft infection and early failure. AIM: To assess the efficacy of cyanoacrylate adhesive in the management of large perforations of the maxillary sinus membrane during sinus lifts. MATERIAL AND METHODS: Six rabbits were used in the study. Sinus membrane perforations (about 1.5 cm in length) were repaired with cyanoacrylate adhesive on one side of the maxillary sinus. On the contralateral side, an identical laceration was not repaired. Histological evaluation was performed 2 weeks after the operation. RESULTS: Wounds repaired with cyanoacrylate adhesive showed newly formed continuous epithelium across the previous perforation site and there was sinusitis on the contralateral side. CONCLUSION: These results support the clinical use of cyanoacrylate adhesive for repairing sinus membrane perforations.

Animals↗
PubMed2004

Laser in situ keratomileusis flap tear during lifting for enhancement in the presence of post-photorefractive keratectomy corneal haze.

A patient who had photorefractive keratectomy for low myopia 6 years earlier had an enhancement by hyperopic laser in situ keratomileusis (LASIK). Moderate reticular corneal haze developed after LASIK. An attempted flap lift 4 months after LASIK resulted in a flap tear at the edge of the zone of corneal haze. Because haze can indicate an area of exuberant wound healing that can result in flap adhesion to the bed, recutting a LASIK flap may be safer than lifting it in the presence of haze.

Adult↗
PubMed2004

Flap lift for LASIK retreatment in eyes with myopia.

PURPOSE: To analyze the results achieved with LASIK retreatment after lifting the original flap in a large series of patients. DESIGN: Retrospective, noncomparative, interventional consecutive case series. PARTICIPANTS: Two thousand four hundred twenty-two consecutive eyes undergoing LASIK surgery for myopia, including 334 eyes submitted to flap lift for LASIK retreatment. MAIN OUTCOME MEASURES: Uncorrected visual acuity, best-corrected visual acuity, refractive error, and complications. RESULTS: LASIK retreatment was performed in 334 eyes (14%), and the mean time between initial procedure and retreatment was 8.2+/-6.2 months. The mean spherical equivalent (SE) improved from -1.2+/-0.6 diopters (D) (range, -4.2 to +1.2 D) before retreatment to +0.2+/-0.4 D (range, -3.1 to +1.1 D) after the retreatment. The uncorrected visual acuity (UCVA) after retreatment was 20/20 or better in 58% and 20/40 or better in 92% of eyes. The mean SE was within +/-1.0 D in 96% of the patients and within +/-0.5 D in 80.5% after retreatment. Eighteen eyes (5%) lost 1 line of best-corrected visual acuity, and 4 eyes (1%) lost 2 lines. CONCLUSIONS: LASIK retreatment surgery performed by relifting the flap was a useful procedure for correcting residual refractive errors after the primary LASIK procedure. It provided good uncorrected visual acuity, predictable results, good refractive stability, and few complications.

Adolescent↗
PubMed2005

The use of autologous fibrin glue for closing sinus membrane perforations during sinus lifts.

Sinus lift procedures depend greatly on fragile structures and anatomical variations. These procedures may cause sinus membrane perforations, which can lead to graft infection and early failure. The aim of this study was to assess the efficacy of autologous fibrin glue in the management of large perforations of the maxillary sinus membrane occurring during sinus lifts. After elevating the sinus membrane in the bilateral maxillary sinuses of 6 adult female mongrel dogs, a laceration (about 2.0 cm in length) was made in the membrane and either repaired with autologous fibrin glue or covered with a bioabsorbable collagen membrane as a control. Wounded areas were biopsied 2 weeks after the operation. Wounds repaired with autologous fibrin glue showed newly formed continuous epithelium across the previous perforation site. However, extensive fibrosis, inflammatory infiltration, and absent epithelium were observed in wounds treated with the collagen membrane control. Our results support the clinical use of autologous fibrin glue for repairing sinus membrane perforations.

Animals↗
PubMed1999

Cerebrospinal fluid leakage during endscopic forehead lifting.

PURPOSE: To report a case of endoscopic brow lift in which cerebrospinal fluid leakage was encountered. METHOD: A 69-year-old otherwise healthy man underwent endoscopic forehead lifting. RESULTS: An area of strong adherence was encountered in the area of the left superior paracentral scalp incision. As the adherence was released, clear fluid extruded (cerebrospinal fluid) and a burr hole was discovered. Absorbable gelatin sponge was placed over the dural defect and burr hole, and closure of the endoscopic scalp incisions was accomplished. CONCLUSION: Caution is suggested in performing this procedure when a patient has any history of a head trauma.

Aged↗
PubMed2004

Electrocardiogram signals de-noising using lifting-based discrete wavelet transform.

This paper introduces an effective technique for the denoising of electrocardiogram (ECG) signals corrupted by nonstationary noises. The technique is based on a second generation wavelet transform and level-dependent threshold estimator. Here, wavelet coefficients of ECG signals were obtained with lifting-based wavelet filters. A lifting scheme is used to construct second-generation wavelets and is an alternative and faster algorithm for a classical wavelet transform. The overall denoising performance of our proposed method is considered in relation to several measuring parameters, including types of wavelet filters (Haar, Daubechies 4 (DB4), Daubechies 6 (DB6), Filter(9-7), and Cubic B-splines), thresholding method, and decomposition depth. Three different kinds of noise were considered in this work: muscle artifact noise, electrode motion artifact noise, and white noise. Global performance is evaluated by means of the signal-to-noise ratio and visual inspection. Numerical results comparing the performance of the proposed method with that of nonlinear filtering techniques (median filter) are given. The results demonstrate consistently superior denoising performance of the proposed method over median filtering.

Algorithms↗
PubMed1998

Simplified abdominal wall-lifting device for gasless laparoscopy.

OBJECTIVE: To develop a simplified abdominal wall-lifting device for gasless laparoscopy. METHODS: The device is composed of an electric-power actuator, sliding arm and abdominal wall-retractor. All parts of the device are reusable. The device provides planar displacement of the anterior abdominal wall to enable space for laparoscopy. The valveless ports and conventional instruments, as well as laparoscopic instruments, were used without a gas leak problem. RESULTS: After preliminary success in the laboratory testing, a petition was made to the hospital's Ethic Committee. Since then we have performed 40 gasless laparoscopic procedures including 13 salpingo-oophorectomies, 10 diagnostic laparoscopies, five tubal ligations, five ovarian cystectomies, four salpingectomies, two removals of pelvic IUDs and one laparoscopic hysterectomy. There were no surgical complications, including no abdominal wall trauma. The operative field was almost the same as that of the pneumoperitoneum technique, with the exception of morbidly obese patients. CONCLUSIONS: This preliminary experience demonstrates the efficiency of the simplified abdominal wall-lifting device and the potential advantages of gasless laparoscopy. Continued modifications and applications are necessary to delineate the full range of benefits of this device and technique, especially in developing countries.

Abdominal Muscles↗