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Biomedical subjects

O Hallén

Publications and source records attributed to O Hallén.

At least 19 recordsLinked to original sources
PubMed1984

A simple operation for bilateral vocal cord paralysis.

To reduce the laryngeal obstruction in bilateral vocal cord paralysis, a new method of laterofixation was developed. The method is technically simple and less traumatic than previously published methods. No peroperative tracheostomy is needed. During surgery two needles are inserted through the thyroid cartilage. A nylon thread is passed through the needles and the needles are then withdrawn. The thread thus forms a permanent loop around the vocal cord. The effects of the laterofixation on breathing and on the voice are documented by assessment of upper airway resistance and by two listening panels respectively. Thirteen patients have been operated upon so far. In most cases the breathing was improved and the influence on the voice was moderate and adjustable. If needed the possibility to perform a more extensive surgical procedure still remains. We suggest our method of laterofixation to be the first treatment of choice in patients suffering from bilateral vocal cord paralysis.

Adult↗
PubMed1983

Direct bone anchorage of external hearing aids.

Some patients with hearing disorders cannot wear a conventional hearing aid but have to use bone conduction in which the aid has to be attached with steel springs over the head. A new method of reconstruction involving the insertion of bone-anchored screws has been tested in a clinical survey of 14 patients. A titanium implant was anchored in the temporal bone and, in a later session, connected to a skin penetrating abutment. An external hearing aid was snapped on to the abutment. The patients have now been followed up for 53 months. There have been no problems with the bone anchorage or with infections around the skin penetration site. The hearing of the patients has improved. The cosmetic result is reported to be favourable.

Adolescent↗
PubMed1981

Osseointegrated titanium implants in the temporal bone. A clinical study on bone-anchored hearing aids.

The purpose of this study is to investigate the possibilities for attaching a new type of direct bone conduction hearing aid. Using a gentle surgical technique, titanium screws were inserted into the temporal bone of fourteen patients suffering from hearing impairment. The implants became integrated with the living bone tissue and have remained so for a follow-up period of, at present, two to four years. It is therefore concluded that titanium implants may be osseointegrated in the temporal bone in a similar manner to that previously described for long bones. The bone-anchored titanium screws were connected to a permanently skin-penetrating abutment, which in turn was used for attachment to a hearing aid. In this way a direct bone conduction without obstructing soft tissue layers is secured. The permanent skin penetration caused no adverse soft tissue effects. The new system has improved pure-tone hearing threshold by about 15 dB. Further research is aimed at the construction of a new hearing aid that is better adapted to the impedance situation existing in the directly bone-anchored cases.

Adolescent↗
PubMed1975

Fibro-osseous lesion of the mandible mimicking chronic osteomyelitis.

An account is given of the clinical, radiologic, and pathologic, features of a special form of fibro-osseous lesion of the mandible. The material consists of fifteen cases (eleven females and four males). Two cases are described in detail. Together with Case 1, a probably unique series of radiographic pictures is presented, showing the development of the disease.

Adolescent↗
PubMed1975

Long-term treatment and prognosis of malignant tumors of the nasopharynx.

A wholly unselected material of 56 patients with malignant tumors in the nasopharynx is presented. The individual course of each patient is tabulated. On the basis of the given therapy, mainly radiotherapy, the poor long-term prognosis of these patients is discussed. Stress is laid on the important problem of palliation in the final stage.

Adult↗
PubMed1975

Malignant tumours of the oral cavity. A study of 177 cases.

An unselected material of 177 patients with malignant tumours of the oral cavity is presented and classified according to the TNM system. A therapeutic classification based on the TNM system is proposed. The material is analyzed regarding the 5-year survival rate and the frequency of recurrences in different therapeutic groups.

Adolescent↗
PubMed1975

Reconstruction of the defective mandible.

In a clinical material consisting of 31 cases of mandibular defects, caused by tumour resection or by trauma, reconstruction has been carried out by means of a stabilizing titanium splint and autologous bone and marrow transplantation, the longest period of observation being 9 years. The functional results obtained are assessed with reference to the cause of resection. Different technical procedures are described and the objectives and the planning of reconstruction of the lower jaw are discussed.

Adult↗