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Biomedical subjects

H Weerda

Publications and source records attributed to H Weerda.

At least 91 records · Page 5Linked to original sources
PubMed1981

[A new laryngoscope for endolaryngeal microsurgery. A contribution to injector respiration (author's transl)].

A new laryngoscope was developed in order to improve visualization of the larynx and to better adapt the instrument to individual clinical circumstances. As such, the Kleinsasser laryngoscope was divided into tow parts, with the width between the two halves changed by adjustment of a screw. The lower part of the instrument can also be moved to provide more space near the larynx. Since the laryngoscope is open laterally, there is more space for the operator, and shorter instruments can be used for endolaryngeal manipulations. The endoscope can be used for intubation as well as for injection of oxygen under pressure at 0.5 bar (with an inspiration-expiration ratio of 1:2 at a frequency of 13/min). With the new instrument, the advantages of the Kleinsasser laryngoscope have been combined with the Killian suspension endoscope.

Humans↗
PubMed1981

[The "transposition-rotation flap" in the one stage reconstruction of auricle defects (author's transl)].

To close full thickness auricle defects (Fig. 1 a) we use a hairbearing rotation flap to transport the non-hairbearing transposition flaps in the right, retroauricular position (Fig. 1 b). The scars are lying in the hair and in the RSTL of the neck. If the helix is not resected (Fig. 6 a), we have to remove epithelium to fix the folded transposition flap in the defect (Fig. 6 c). In the same way we use this flap to close large defects in the retro- and postauricular region and to reconstruct auricle deformities.

Adult↗
PubMed1980

[The critical point in laryngeal and tracheal obstruction (author's transl)].

Laryngeal and tracheal obstruction can be more fully assessed using plethysmography. Experiences with 46 patients show that airway resistances exceeding 150 mm H2O/l/s always indicate a critical situation and these patients require urgent tracheostomy or intubation. - Three patients with glottic tumours and one patient with glottic oedema were tracheotomized because of the danger of asphyxiation. In these, resistances of between 107.4 and 150 mm H2O/l/s were found. Airway resistance exceeding 100 mm H2O/l/s are therefore critical indicators in patients with glottic oedema and laryngeal tumours.

Airway Resistance↗
PubMed1980

[Myocutaneous island flap for one-stage reconstruction of stenoses of the cervical esophagus (author's transl)].

In the past, we have used island flaps for the successful reconstruction of the trachea (Weerda, 1978, 1979). We have now extended our procedure to allow repair of esophageal stenosis through the use of an island flap which is pedicled on the sternomastoid muscle. A silicone stent is fixed in place with a mattress suture, and is removed after four weeks by endoscope. We have treated one patient by this method: he has thus far done well, and is swallowing satisfactorily one year following surgery.

Esophageal Stenosis↗
PubMed1980

[The trauma of the auricle (author's transl)].

We report the methods we use in the treatment of partial loss of the upper, middle and lower part of the ear. One ear with total avulsion was replanted by the technique described by Arfai. The reconstruction of the ear is described with a frame work of autogenous rib cartilage and the "pocket technique". A method we developed with a "transposition-rotation flap" is explained.

Cartilage↗
PubMed1980

[Experiences with surgery of the trachea. An analysis of 135 cases (author's transl)].

The different surgical approaches for the correction of tracheal stenosis are analysed in 135 patients who were treated by us during the past 15 years. Poor results were associated with dilatation alone. Tracheomalacia was successfully managed in 51% of the patients by using Schobel's technique of acrylic plastic frames, while sleeve resections succeeded in nearly 90% of the cases (particularly when absorbable suture material was used and the patient was given cortisone for six weeks postoperatively). The staged open "channel" technique described by Rethi (1959, 1967) was also used, and was modified by an island flap method. We have used this one-stage method during the past three years, and have been able to reduce the time needed for treatment from nearly one year to 110 days. In so doing, the average number of operations for one patient could be decreased from 4.25 to 1.27, while the success rate for surgery increased from 73 to 92%.

Age Factors↗
PubMed1979

[A new laryngoscope for endolaryngeal microsurgery. A contribution to injector respiration (author's transl)].

A new laryngoscope was constructed in order to improve visualization of the larynx and to adjust the instrument to individual situation. The Kleinsasser laryngoscope was divided into two parts. The width between these two halfs can be changed by screws. Because the laryngoscope is open laterally there is more space for the operator and shorter instruments can be used.

Laryngoscopes↗
PubMed1979

[Remarks about otoplasty and avulsion of the auricle (author's transl)].

I. Correction of the prominent ear. A modification of the Mustarde-technique is reported. We mill with a diamonddrill two rims, one above and a second beneath the new anthelix. So we are able to form anthelix and helix to get a smooth contour. II. Restoration of superior helix. 1. Using the method reported by Cronin (1953) it is necessary to plan the reconstructed part a little bit larger than the normal contour. By shrinking of the skin and resorption of the incorporated cartilage we get normal proportions half a year later. 2. Using the method by Crikelair (1956) we took the auriculo-cephalic flap as a composite graft from the concha. The defects could be closed primarily without using a free graft. III. Replantation of the amputated auricle. We used the method, reported by Arfai (1963). Four operations were necessary to get a satisfying result.

Adult↗
PubMed1978

[One stage reconstruction of the trachea with an island flap (author's transl)].

After treatment of the tracheal or laryngo-tracheal stenosis and forming a groove or using Rethi's operation, putting a full thickness skin graft or mucosa into the posterior wall, we use a silicone rubber tube for dilatation. An island flap, pedicled upon the long muscles of the larynx is used for closing the defect in the anterior wall of the trachea. We treated four patients with this method, three left hospital with normal diameter of trachea and resistance between 17 and 20 mm H2O/1/s.

Cartilage↗
PubMed1978

Treatment of long, rigid tracheal stenoses. An experimental study on animals.

Using both PVC models and animal experiments, new surgical methods of expanding long, rigid tracheal stenoses were investigated. After making a longitudinal incision laterally, oval-shaped composite grafts from the auricle were sutured on either side of the trachea. The stenoses were successfully stretched from about 35 to about 80% of the original lumina. In this way, and together with a sleeve resection, stenoses up to 7 or 8 cm are operable. It is the first time in experiments that a stenosis was carried out beforehand, and later expanded. This method allows a better judgement of the final result to be reached. Modifications of the basic technique are described and results are discussed in some detail.

Animals↗