Dacron Felt Research Articles

Surface profile of laminated transfemoral socket fabricated with different types of reinforcement materials.

Composite materials used in the prosthetic and orthotic fields have helped improve the fabrication of sockets. Laminated sockets proved to be stronger than conventional thermoplastic sockets. The internal surface of a laminated socket plays an important role in patient comfort and is influenced by the material used to fabricate the socket. This study analyzes the internal surface profile of five different materials, that is, Dacron felt, fiberglass, Perlon stockinette, polyester stockinette, and elastic stockinette. All sockets were fabricated using an acrylic resin mix with hardener powder at a ratio of 100:3. The internal surface of the sockets was tested using the Mitutoyo SurfTest SJ-210 series for 20 trials. The overall Ra values were 2.318, 2.380, 2.682, 2.722, and 3.750 µm for fiberglass, polyester, Perlon, elastic stockinette, and Dacron felt. Dacron felt yielded the lowest Ra value, thus, producing the smoothest internal surface but requiring high skill and the correct technique during the fabrication of a laminated socket. Fiberglass is considered the best material for the internal surface despite not producing the lowest value individually but overall is the lowest and most consistent, indicating that it is easy to use to laminate prosthetic sockets.

Clinical analysis of different root treatment methods in acute Stanford type A aortic dissection

Objective: To discuss the perioperative and follow-up results of different surgical methods for acute Stanford type A aortic dissection patients and analyzed the results. Methods: The clinic data of 351 acute Stanford type A aortic dissection patients received surgical therapy at Department of Thoracic and Cardiovascular Surgery, Nanjing University Medical School Affiliated Nanjing Drum Tower Hospital from January 2008 to December 2015 were analyzed retrospectively. There were 272 male and 79 female patients, aging from 22 to 83 years with a mean age of (52±13) years. According to root size, aortic valve structure and the status of dissection involvement, these patients were devided into three major groups: 218 cases with root reconstruction using Dacron felts, 34 cases with root reconstruction concomitant with aortic valve resuspension repair and 99 cases in with Bentall procedure. Proper shape based on the status of dissection involvement of Dacron patch was cut and put between the middle and outerlayer of aorta, then inside the inner layerone band Dacron felt was sutured with the aorta and the new middle layer with Dacron patch as mentioned above. In some cases the prolapsed aortic valve was re-suspended to the aortic cusp. Clinical outcomes among the 3 procedures were compared by χ(2) test, Fisher's exact test, t test and analysis of variance. Results: Cardiopulmonary bypass, cross-clamp, and circulatory arrest times of all the patients were (250±78), (171±70) and (31±10) minutes, respectively. The 30-day mortality was 9.2%(33/351), while no difference among the 3 procedures (9.6%, 8.8% and 9.1%). In the average follow-up time of (26.0±23.0) months (range from 0.5 to 90.0 months), survival rates were similar among the 3 procedures (77.7%, 77.4% and 77.8%). Only one patient received redo Bentall procedure because of severe aortic regurgitation and dilated aortic root (diameter of 50 mm). Conclusions: The indication of root management of acute Stanford type A aortic dissection is based on the diameter of aortic root, structure of aortic leaflets, and the dissection involvement. For most acute Stanford type A aortic dissection patients, aortic root reconstruction is a feasible and safe method.

PP-139 A Rare Complication of Chest Trauma; Saccular Aortic Aneurysm Induced by Blunt Chest Trauma and Successful Endovascular Treatment

continued mildly to a cranial position. The 4 cm long tear is sewn primarly with a dacron felt. We begun to suture a 32 mm dacron graft to a supracoronary position.The posterior suture line is placed over the dacron felt and the proksimal anastomosis is completed. After the end of the ascending aortic replacement the patient is taken to the intensive care unit, his postoperative period was uneventfull. The development of our patients pseudoaneurysm is not clear.. The scar tissue that surrounded the aorta has limited a rupture and formed a growing pseudoaneurysm on the posterior aortic wall. He had no symptoms or complaints. We think it can be related to the previous surgery.It firstly was diagnosed as a aortic dissection in a routine control. We conclude that patients with prevous cardiac surgery must be followed up closely and atypiccal foundings must be evaluated further.

Experimental Study on the Burning Behavior of Automotive Internal Decorating Materials

Experimental study on the burning behavior of four kinds of common automotive internal decorating materials including fur cushion, flannel cushion, dacron seat cover and felt carpet by means of cone calorimeter are introduced in this paper. Compared with the four kinds of materials from the perspective of ignition time, HRR, peak HRR and carbon monoxide release rate under different heating flux, burning behaviors of these materials are analyzed. According to analysis results, the risk of automotive fire disasters can be objectively evaluated. In a word,it’s helpful to study their burning behaviors and point out proper methods of application.

Technique for Insertion of the Inflow Cannula of the INCOR Left Ventricular Assist Device

Our insertion technique for the inflow cannula of the INCOR left ventricular assist device (Berlin Heart AG, Berlin, Germany) is as follows. The apex ring is secured to the left ventricular apex using eight horizontal mattress sutures with full-thickness bites of myocardium. Another eight horizontal mattress sutures are then placed first through the Dacron felt pledgets (DuPont, Wilmington, DE) of the previously placed mattress sutures and then through the myocardium, the apex ring, and the suture collar of the inflow cannula. A double purse-string 3-0 polypropylene suture is placed on the Dacron pledgets around the apical hole and tightly tied.

Implantation technique for the DuraHeart left ventricular assist system

The DuraHeart is a centrifugal pump with a magnetically levitated impeller. We implant the DuraHeart blood pump, which is 72 mm in external diameter and 45 mm in height, in a preperitoneal pocket in the left upper abdomen. An apical cuff is sutured to the apical hole in the left ventricular apex with 12 mattress sutures of 3-0 Prolene pledgeted with Dacron felt. In the first six mattress sutures, the needle is exited from the apical hole after a full-thickness bite of myocardium, and in six additional mattress sutures, the needle is exited from the epicardial edge of the apical hole. Next, a double purse-string suture with 3-0 Prolene is placed on the Dacron pledgets around the apical hole. After the inflow conduit has been connected to the inlet port of the blood pump, the inflow conduit is secured to the apical cuff. The graft portion of the outflow conduit, which was connected to the blood pump beforehand, is sewn end-to-side to the ascending aorta with a 4-0 Prolene suture. Gentle suture connection of the apical cuff to the left ventricular apex and optimal alignment of the inflow conduit, which is bent by 60 degrees, are crucial in the surgical procedure. A detailed description of the implantation technique is presented to facilitate the use of this system.

Mitral Valve Repair for Ischemic Mitral Regurgitation in Dilated Cardiomyopathy

Ischemic mitral regurgitation contributes to poor survival in patients with heart failure. The intermediate-term outcome of mitral reconstruction in 15 patients who had ischemic dilated cardiomyopathy with mitral regurgitation requiring surgical intervention was studied. They underwent mitral valve repair along with coronary artery bypass surgery. The mitral valve coaptation depth was considered an important parameter in deciding on repair. Ages ranged from 43 to 72 years. Left ventricular ejection fractions were 15-38% (mean, 26.5% +/- 4.3%). The operative technique in all 15 patients was posterior annuloplasty using Dacron felt. At a mean follow-up of 4.6 +/- 1.2 months (1-8 months), postoperative transesophageal echocardiography revealed mild mitral regurgitation in 2 patients and none in 13. There was a significant improvement in New York Heart Association functional class from 3.9 +/- 1.1 to 1.9 +/- 0.3. Mitral valve repair by posterior felt annuloplasty provides favorable results in the intermediate-term in selected patients with ischemic cardiomyopathy and severe left ventricular dysfunction.

Partial Translocation for Repair of Left Ventricular Rupture After Mitral Valve Replacement

A new partial translocation technique to repair left ventricular rupture after mitral valve replacement and reimplant a mitral prosthesis is described. We repaired a tear from the interior by using mattress stitches buttressed with strips of Dacron felt, constructed a new annulus with a crescent-shaped piece of bovine pericardium on the left atrial wall above the repaired mitral annulus, and implanted a new prosthesis by using the newly constructed mitral annulus. We consider avoidance of mechanical stress by the prosthesis on the repaired site crucial to a successful outcome, and this new method is useful.

Implantation of a left ventricular assist device, back-to-front, in an adolescent with a failing mustard procedure

easier. The aorta was crossclamped and blood cardioplegic solution was administered antegradely. The optimal positioning of the HeartMate vented electric device was back-tofront, with the inflow directed toward the diaphragmatic wall of the right ventricle and the outflow toward the apex region. Two incisions were made in the diaphragm corresponding to the inflow and outflow tracts. To avoid damage to the liver, from the front of the pump, we made a “pillow” from polytetrafluoroethylene (Preclude pericardial membrane*) stuffed with Dacron felt. When the device was in place, the inflow was on the right side and the outflow on the left side (Fig 2). An expected pulmonary hypertension was prevented with inhaled aerosolized epoprostenol (prostacyclin).4 The early postoperative course in the intensive care unit was uneventful, and after 2 weeks the patient was transferred to the ward. Five weeks after the operation the patient was discharged from the hospital to his home, located 1500 km from our hospital, to await a donor heart. Comment. The need for assist devices in patients with complex congenital heart conditions, as after atrial correction for transposition of the great arteries, could be a surgical technical challenge. Because the right ventricle is the systemic ventricle in transposition, several points must be considered. To place the device on the right side in the abdomen Implantation of mechanical assist devices has saved the lives of patients awaiting heart transplantation.1 The HeartMate left ventricular assist device (Thermo Cardiosystems, Inc, Woburn, Mass) is made to connect the inflow cannula to the apex of the left ventricle.2 We describe a successful case in which the device was placed back-to-front with the inflow cannula inserted into the diaphragmatic wall of the right ventricle and the outflow graft through the left side of the diaphragm and in the left pleura to the ascending aorta (Fig 1). Medical history. A 15-year-old boy who was born with transposition of the great arteries underwent several balloon septostomies at birth because of desaturation. Despite this treatment, the desaturation was persistent. He therefore underwent an operation on an emergency basis at 3 months of age with an atrial switch as described by Mustard (pericardial baffle). At 4 years of age he required a reoperation because of residual atrial shunt and stenosis of the superior vena cava. Ten days after this operation a VVI pacemaker system was implanted because of atrioventricular dissociation. He then had an active life for almost 9 years, after which he gradually noted progressive fatigue and dyspnea. He had a cough, nausea, and cyanosis. Cardiac assessment revealed severe biventricular failure, gross atrioventricular valve regurgitation, and pulmonary hypertension (although reversible), and he was listed for heart transplantation. Despite “optimal” inotropic support, his condition continued to deteriorate with signs of multiorgan failure. Because no donor was available, we decided to implant a HeartMate left ventricular assist system, even though we expected major technical difficulties since the right ventricle, where the inflow cannula had to be placed, was the systemic ventricle. Surgical procedure. A median sternotomy was performed, and the heart, which was heavily adherent, was carefully dissected. Because the patient was thin, we decided to place the pump intraperitoneally.3 The aorta was cannulated. The systemic atrium was cannulated, and a left-sided bypass was instituted. This made the subsequent cannulation of the cavae

Proposição de técnica endocavitária para remodelamento ventricular esquerdo

Left ventricular remodeling by partial ventriculectomy is a recent proposition for palliation in dilated cardiomyopathy when cardiac transplantation is contraindicated. This procedure carries a high morbimortality due to myocardial ischemia, necrosis and arrhythmias. This paper presents a technique for endocavitary left ventricular remodeling which maintains the hearts morpho-functional architecture without myocardial resection. Under extracorporeal circulation and hypothermic cardioplegia, a left atriotomy is done, the anterior mitral leaflet removed and a triangular shaped bovine pericardial graft (aproximately 2 x 6 x 6 cm) is implanted inside the left ventricular cavity with 3-0 Polipropilene anclosed in Dacron felt. The graft is sutured in a divergent way from the apex to the mitral ring, at the middle of the septum and at the posterior papillary muscle. This produces an internal plication with ventricular cavity reduction. Myocardium and coronary circulation are preserved. The base of the triangular graft is sutured to the mitral annulus and the mitral bioprosthesis is implanted. The procedure was employed in 8 patients with dilated cardiomyopathy, not candidates to transplantation, 2 females and 6 males, ranging from 24 to 58 years. Five had mitral regurgitation. All were in hospital, at class IV (NYHA). Mortality was 25% (2 cases): 1 in the hospital and 1 at 3 months p.o. The table shows the echocardiographic parameters for LV function: Pre-operative Post-operative Cardiac output (L/min) 2,6 ± 0,4 3,8 ± 0,7 p<0,001 Cardiac index 1,9 ± 0,9 2,7 ± 0,6 p<0,005 Ejection fraction 21,5 ± 4,0 37,8 ± 1,2 p<0,05 Intracavitary left ventricular remodeling presented a satisfactory result related to mortality and morbidity, with functional improvement over the short term. Longer follow-up is needed to evaluate its role, which might be a bridge to transplantation. A limitation exists in the necessity for replacing the mitral valve.

Successful operation for solitary fibrous tumor of the epicardium

Successful operation for solitary fibrous tumor of the epicardium

Use of pledgets in the repair of abdominal wall defects

This article describes surgical techniques using Dacron felt pledgets over the sutures to protect tissue against tearing in the procedures used for the closure of the abdominal wall defect in gastroschisis and omphalocele.

Use of pledget in the repair of diaphragmatic anomalies

This report describes surgical techniques used for the repair of congential diaphragmatic anomalies such as diaphragmatic hernia or eventration, using Dacron felt pledgets over the sutures to protect the tissue against tearing.

Inhibition of the inductive activity of demineralized bone matrix by different percutaneous implants

Teflon tubes with either Gore-Tex (PTFE) or Dacron felt sleeves were implanted percutaneously in rats, in conjunction with demineralized bone matrix. This resulted in different inflammatory reactions, as well as in chondrogenesis and osteogenesis in the subcutaneous tissues. Although induction of osteogenesis by the demineralized bone matrix in the vicinity of the foreign material was inhibited, circumferential bone formation was highly reproducible. The prospect of utilizing demineralized bone matrix in order to enhance acceptance of percutaneous tubes is discussed.

Light and scanning electron microscopy evaluation of the Dacron felt as the haptic part of an improved keratoprosthesis. An in vitro and in vivo study

The artificial cornea (keratoprosthesis) is indicated in severe ocular diseases not amendable by means of a corneal transplant. In order significantly to reduce the number of the failures due to the epitheIization of keratoprosthesis implants, an improved device with a Dacron haptic part has been developed. The light (LM) and scanning electron microscopy (SEM) observations showed that the Dacron felt is ingrown by ocular tissues, in vitro and in vivo. Fibrous connective tissue stops the epithelial proliferation around the prosthesis by contact inhibition, thus avoiding its encapsulation and/or extrusion. These results may be predictive of the new keratoprosthesis reliability.

Reconstructive rhinoplasty with nasal implants

A new method of immobilizing nasal implants is the creation of a strong fibrotic reaction with sewn polyester (Dacron) felt. It has been applied to saddle nose deformity, as well as maxillary retrusion of flat nasal tip. Over a period of 15 years in a large number of cases, the complications have been only a temporary inflammatory reaction in 5% of the cases.

The experimental value of silicone-sheet, dacron felt spacers in prevention of capsular contractures.

An experimental study is recorded that compares the use of soft gel silicone implants with, and without, a silicone sheet Dacron felt spacer, using the scalp of the guinea pig as a test site. Capsular contractures were produced in 45 percent of the control animals without the spacer. This was documented histologically to be related to a migration of muscle fibroblasts and could be prevented by the fixation of the Dacron felt to the pocket floor peripheral to the implant.

Long-term ureteral replacement prosthesis

A silicone rubber tube with bonded Dacron felt cuffs have been implanted in dogs as a ureteral replacement prosthesis. A one-way valve has also been developed to prevent reflux so the prosthesis may be put into the bladder. The prosthesis has been implanted for periods up to nine months. Although there are some problems associated with the prosthesis, most animals have maintained a normal serum creatinine, sterile urine, and a normal excretory urogram.

Fixation of Celestin tube to the anterior abdominal wall: A new technique

Palliative intubation in the management of an unresectable carcinoma of the esophagus can be accomplished by "push through" or "pull through" techniques. The most frequently encountered complication is tube dislodgment-proximal or distal migration. Dislodgment occurs more freqeuntly with the "push through" tubes such as the Souttar tube than with the "pull through" tubes such as the Celestin tube. The incidence of migration reported for the "pull through" tubes varies from 3 to 14 per cent. In order to prevent migration, we sutured the tube to the anterior abdominal wall in 6 patients. The sixth patient developed a gastrocutaneous fistula and fasciitis at the point of anterior abdominal wall fixation. In the next 4 cases, we used a two-suture technique, in which no single suture passed from the gastric lumen to the anterior abdominal wall fascia. The Celestin tube was fixed to the gastric wall over a Dacron felt pledget and this pledget was then anchored to the rectus fascia. This technique has prevented both migration of the tube and complications related to gastric perforation.

Experimental studies with synthetic venous bypass grafts, including a new experimental model

A new experimental model has been developed for testing synthetic grafts interposed in the venous system. This model utilizes end to side anastomosis of the graft with the superior vena cava at one end and end to side anastomosis with the stump of the atrial appendage at the other. It incorporates the ligation of the superior vena cava at the cardiac end and the azygous vein at its point of entry into the vena cava. It permits carrying out experiments in which all of the grafts are uniform in diameter and length and thus reduces the variables to the types of prosthetic grafts tested. The fact that grafts of great length can be employed increases the severity of the test. Experiments using this model were performed to evaluate two types of porous compressed Dacron felt fiber grafts. One of these two types of plain felt tubular grafts yielded a very high patency rate over a period of three months and the other type gave fair results. In contrast, almost all of the felt grafts lined with collagen and impregnated with heparin became occluded with thrombus regardless of whether they were straight or crimped and normally tanned or hypertanned and the few exceptional ones that were not occluded were markedly stenotic. The control DeBakey knitted Dacron grafts all were found to be clotted and collapsed at the time of postmortem examination. The relatively good results with plain felt tubular grafts subjected to this severe test suggest that further study of such grafts may be profitable and that grafts of this type may deserve cautious clinical trial.