DE1291054B - Stethoscope with double chest piece - Google Patents

Description

The invention relates to a stethoscope with a double chest piece, as is the case for auscultation of internal organs, e.g. B. of the heart or the lungs will.

Stethoscopes of this type are already available in various designs known. They usually have two funnels opening on opposite sides different diameters or different volumes, with one of the funnels, z. B. the larger diameter, is closed with a membrane.

When using it, it is important that the auscultation - used to bring the funnel into acoustic connection with the one in the ear tubes opening sound conductor.

In a known design, the double chest piece is rotatable arranged at the end of the rigid sound conductor, this end having a lateral, having communicating with the sound channel bore and the rotation in the Type of a stopcock each one of the two funnels in acoustic connection brings with the sound channel.

Apart from the complex training that leads to high manufacturing costs and leads to a greater weight of the double breastpiece, result from such Training specific disadvantages.

Auscultation cannot be done continuously because the switchover is necessary at intervals. This usually requires both hands of the examining doctor. When switching, it is not always possible to have a hard Avoid noise that has a detrimental effect on the hearing adaptation of the doctor Has. In particular, however, the sharp bends in the sound channel lead to transmission losses especially with the high-frequency components of sound, which are particularly special are revealing.

There are also stethoscopes with a double chest piece without moving mechanically Parts with which a continuous auscultation can also be carried out, known. In such a known embodiment, the sound channel leading to the ear goes from a funnel closed with a membrane.

The open funnel of this double breast piece opens. on the shortest Paths into the membrane-sealed funnel. When using auscultation of the membrane-sealed funnel, the doctor closes the opening with a finger of the open funnel.

The main disadvantage of this known training is that that during auscultation by means of the open funnel, the sound is only on the way reaches the sound conductor via the funnel space of the membrane-sealed funnel. This occurs because of the complexity of the path that the sound signal will take must, considerable distortion and there will be in particular due to the membrane the closed funnel picked up background noises, which are superimposed. As in the embodiment described at the outset, losses also occur here in the case of the high-frequency components of sound.

The present invention is based on the object of a stethoscope with double breastpiece, one of which is closed with a membrane funnel and the acoustics common to both funnels has rule's connection channel, such train that without the use of moving parts of the sound when using both Funnel is guided in a simple, straightforward way possible.

This object is achieved in that the common connection channel opens sideways into the larger open funnel, while the channel for the with the membrane closed funnel in front of the mouth of the common connection channel branches off in this. The two channels are in constant communication with one another.

With such a training, the disadvantages described above become Avoided the known designs and achieved the advantages that a continuous Auscultation with both funnels of different frequency selection is possible, with In particular, the high-frequency components can be heard and distinguished well can. It is precisely these high-frequency components that provide information in a special way about pathological changes in the examined organ.

The invention is based on the drawing, which shows an inventive Stethoscope represents in section, explained in more detail.

The double chest piece stethoscope has one with a diaphragm 1 closed funnel 3 and an open funnel 2, the volume the latter funnel is larger than that of the former. A common acoustic Connection channel 4 opens laterally at 6 into the open funnel 2. The one with the membrane 1 closed funnel 3 is above the channel 5 with the common connection channel 4 in connection, these two channels in front of the mouth 6 of the common connection channel meet in the open funnel 2.

Because the closed funnel is a relatively small one Has volume, its influence when listening using the open funnel is negligible small. In particular, the position of the channels to one another prevents the in one the sound picked up by the funnel is conducted into the other funnel.

During auscultation, the open funnel 2 is used first. Then the stethoscope is turned over so that the funnel 3 is closed on the body of the patient to be examined is applied, the opening 6 of the channel 4 with a Finger of the hand holding the stethoscope is covered.

The stethoscope according to the invention results in a good frequency selection, which makes the analysis of the tapped tones much easier.

Claims (1)

Claim: stethoscope with double chest piece and funnels of different types Size, one of which is open and one is closed with a membrane, one has both funnels common acoustic connection channel, d a d u r c h g e indicates that the common connection channel (4) sideways into the larger open Funnel (2) opens, while the channel (5) for the closed with the membrane Funnel (3) branches off into this before the mouth (6) of the common connection channel, both channels (4, 5) are permanently connected to one another.