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Biomedical subjects

H Weerda

Publications and source records attributed to H Weerda.

At least 73 records · Page 4Linked to original sources
PubMed1985

[Myomucosal flaps of the tongue for covering defects in the mouth area].

The extraordinarily rich blood supply of the tongue makes it possible to use a variety of pedicled tongue flaps: 1. Defects of the dorsum of the tongue can be covered either with island flaps from the margin or with flaps crossing the midline. 2. Medial defects can be covered by flaps taken from both sides or from the centre of the dorsum. 3. Defects of the tip of the tongue or the front of the floor of the mouth can be filled by island flaps taken from one or both sides of the tongue. Large defects can be crossed by a triangular island flap pulled through a tunnel. 4. For defects in the lateral floor of the mouth an oval shaped flap from the middle of the tongue is pulled through a tunnel into the defect.

Humans↗
PubMed1985

[Operations to improve hearing in auricular malformations. A catamnestic study of 89 operations].

In the last 20 years 89 middle ear operations were performed on 71 patients with unilateral or bilateral microtia (grade II or III). The methods and the results are described and discussed. In 79.5% we produced a wide auditory canal and achieved an overall hearing gain of 17 dB. We usually do not carry out middle ear surgery in unilateral atresia. In bilateral atresia the child is fitted with a bone conduction hearing aid as soon as possible and is operated on at the age of 4 or 5 years. After middle ear surgery we reconstruct the auricle at an age of 5 or 6 years. If necessary these children are then fitted with an air conduction hearing aid.

Child↗
PubMed1984

[Tracheopexy with support frames. An experimental and clinical study].

The use of acrylic frames to support a weak trachea has been successful in 62,9% of the treated cases (in 22 of 35 operations). The use of ceramic frames has been successful in 92,3% of the cases (in 12 of 13 operations). On the basis of experimental studies, we reconstructed in this manner two rigid stenoses of the trachea by a two-stage method. The first stage consists in expanding the stenosis by means of an endotracheal support of silicone rubber tube; the second stage, in suturing ceramic frames to the trachea. Both operations by this method have been successful. Our methods and results are discussed.

Adult↗
PubMed1984

[Development of laryngoscopy].

The development of laryngoscopy is described and the inventions of Kirstein, Killian, Seiffert, Kleinsasser and Weerda are mentioned. The development of microlaryngeal surgery and the anaesthesic techniques are also described.

Europe↗
PubMed1984

[Surgery of juvenile external ear abnormalities].

Surgery of moderate cup ear deformities, severe cup ear deformities and microtia is described. In cases of unilateral atresia auris we usually do not perform middle ear surgery. In cases of bilateral atresia the child is fitted with a bone conducting hearing aid as soon as possible and operated on when the child is 4 to 5 years old. After bilateral middle ear surgery we reconstruct the auricle at the age of 5 or 6 years.

Child↗
PubMed1983

A new distending laryngoscope for diagnosis and microsurgery of the larynx.

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 two 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. With the new instrument the advantages of the Kleinsasser laryngoscope with the Killian suspension endoscope have been combined.

Humans↗
PubMed1983

[Reconstruction of the lower lip].

The author describes techniques for the reconstruction of the lower lip, especially the wedge-shaped excision, the methods developed by Dieffenbach, Langenbeck, Estlander, Gillies, Weerda, Bernard and Grimm. Using the double Gillies fan flap, labial vessels are preserved because of the lack of circulary anastomoses in 75% and lack of anastomoses in the middle line of the upper lip in 60% and of the lower lip in 32% of the cases. Several examples are given.

Adult↗
PubMed1982

[Personal experiences in the surgery of external ear abnormalities. IV. Microtia].

Our methods of the reconstruction of the microtia are mentioned. In microtia of both auricles we first try to reconstruct the structures of middle ear and the external channel. If possible we use a "transposition-rotation flap" and rib cartilage for support. The advantages of pedicled flaps in auricle surgery are described.

Ear, External↗
PubMed1982

[Controlled respiration with a new "jet-ventilator" in the microsurgery of the larynx. An experimental study on dogs (author's transl)].

To combine the open jet-ventilation system with the security of the closed respiration we developed a new "jet-ventilator". Using a modification of the Carden-tube when we closed the upper part of the intratracheal tube, we had to remove the air by suction during the expiration time. With a pressure-analizer and transducer we could prevent negative and high pressure in the trachea. In experimental studies on six dogs we saw good blood gas analyzers as well as good circulatory parameters. With this method we were able to observe ventilation between eight and nine hours.

Animals↗
PubMed1982

[Computerized photodocumentation with automatic exposure technique in ENT endoscopy (author's transl)].

Proper lighting and exposure of color photographs were often the main problem in endophotography. The photographic equipment used for different regions of the body was complicated or troublesome to handle. In most cases, time and many tests were necessary, yet good photographic results were rarely obtained. To facilitate handling and to overcome the numerous exposure problems in photographic documentation an electronic TTL computer flash with autodynamic controlled flash energy was developed at the department of ORL at the University of Freiburg in 1980. With the single-handed endoscopic photographic system and the electronic TTL computer flash with automatic exposure technique, endoscopic photography becomes a simple and successful procedure. Even an unskilled "endophotographer" will be able to handle the described system easily. Getting good photographic results in endophotography is no longer a time-consuming and elaborate procedure.

Computers↗
PubMed1982

[Blunt neck trauma--the danger of secondary respiratory insufficiency].

It is very difficult to properly assess a lesion of the kind represented by the contuse trauma of the neck, if such assessment has to be effected at the site of the accident. It is a characteristic feature of such a trauma that even hours or days after the accident, acute respiratory insufficiency may suddenly appear if there is an interruption of continuity of the respiratory tract. X-ray and endoscopic findings are mandatory directly after the accident even if it looks as though there are only few signs or symptoms. In case of indication of surgery, all the necessary measures must be taken before initiating anaesthesia to avoid any complications which may be due to hypoxia and aspiration. A case report is given to illustrate the possible discrepancy between the signs immediately after the accident and the findings made later.

Adult↗