Comparative study of in vitro flow characteristics between a human aortic valve and a designed aortic valve and six corresponding types of prosthetic heart valves.

A model of a pulsatile cardiovascular system is described including an electronic control, a hydraulic driving unit, a volume storage, a peripheral resistance and measuring equipment. Six different artificial heart valves, a designed aortic valve (Aachen pockett valve II) and a human aortic valve have been tested in the outflow position of the pump. Three of them are presently being used in clinical applications.

[Experiences in the management of patients with ileo- and colostomy (author's transl)].

In the presented paper the management of stoma-patients has been discussed. Two topics had to be seen, first the psychological guidance of the patient and his reentry into society and second the management of the stoma itself. Beside of the sometimes unavoidable complications the patients are often molested by preventable inconviences as skin-irritation, soiling, and odors.

[Light- and electronmicroscopic findings in nine auto-alloplastic vascular grafts (Sparks-Mandril) (author's transl)].

Auto-alloplastic arterial prostheses with a dacron mesh of 1 or 2 layers according to Sparks were investigated by light and electron microscopy after variable times of incorporation and perfusion. At the end of the organization-period the characteristic structure of the wall is composed of three layers. The interior layer is adapted to the form of the mandril, which holds the place of the lumen, the medial layer is formed according to the inforcing dacron-mesh.

[Experimental studies on the circulation of the vascular area of the subdiaphragm using a newly developed pulse-wave pump].

A new developed partial artificial heart system is presented, which allows pulsatile perfusion of vital organs. The results presented reveal the possibility to duplicate pressure curves and peak systolic pressure in the perfused area-similar to physiological preoperative measurements. The kidney function remains intact.

[Surgical problems in the treatment of aneurysm of femoral artery bifurcation].

The different types and causes of aneurysm in the region of the femoral artery bifurication as well as the possibilities of surgical treatment are discussed on the basis of 4 patients, each with a differnt type of aneurysm. The examples show clearly that the basic of 4 patients, each with a different type of aneurysm. The examples show clearly that the basic disease can prevent successful surgical reconstruction of the arterial blood circulation.