14- السماعة الطبية رينيه لينيك فرنسي 1818م

- يتيم الام وعمره خمس سنوات او 6 سنوات بسبب مرض السل.
- انتقل للعيش مع عمه الراهب.
- وهو في سن الثانية عشرة انتقل للعيش مع عمه الاخر في مدينة نيس حيث كان يدرس الطب.
- انقطع عن دارسة الطب بتشجيع من الده وعايش حياة الهبي لسنوات يكتب الشعر ويسير مسافات طويلة.

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René Laennec

René Laennec
Born17 February 1781
Quimper, FranceDied13 August 1826
Ploaré, FranceCitizenshipFranceNationalityFrenchKnown forInvented the stethoscope
René-Théophile-Hyacinthe Laennec[1] (French: [laɛnɛk]; 17 February 1781 – 13 August 1826) was a French physician. He invented the stethoscope in 1816, while working at the Hôpital Necker and pioneered its use in diagnosing various chest conditions.
He became a lecturer at the Collège de France in 1822 and professor of medicine in 1823. His final appointments were that of Head of the Medical Clinic at the Hôpital de la Charité and Professor at the Collège de France. He died of tuberculosis in 1826.

Early life and personality

Laennec was born in Quimper (Brittany). His mother died of tuberculosis when he was five or six, and he went to live with his grand-uncle the Abbé Laennec (a priest).
At the age of twelve he proceeded to Nantes where his uncle, Guillaime-François Laennec, worked in the faculty of medicine at the university. Laennec was a gifted student, he learned English and German, and began his medical studies under his uncle's direction.
His father (a lawyer) later discouraged him from continuing as a doctor and René then had a period of time where he took long walks in the country, danced, studied Greek and wrote poetry.

However, in 1799 he returned to study. Laennec studied medicine in Paris under several famous physicians, including Dupuytren and Jean-Nicolas Corvisart-Desmarets. There he was trained to use sound as a diagnostic aid. Corvisart advocated the re-introduction of percussion during the French Revolution. Laennec was a devout Catholic. He was noted as a very kind man and his charity to the poor became proverbial.
The invention of the stethoscope

Laennec had discovered that the new stethoscope was superior to the normally used method of placing the ear over the chest, particularly if the patient was overweight. A stethoscope also avoided the embarrassment of placing the ear against the chest of a woman.

The first drawing of a stethoscope, 1819



A modern stethoscope


Laennec is said to have seen schoolchildren playing with long, hollow sticks in the days leading up to his innovation.[4] The children held their ear to one end of the stick while the opposite end was scratched with a pin, the stick transmitted and amplified the scratch. His skill as a flautist may also have inspired him. He built his first instrument as a 25 cm by 2.5 cm hollow wooden cylinder, which he later refined to comprise three detachable parts.
His clinical work allowed him to follow chest patients from bedside to the autopsy table. He was therefore able to correlate sounds captured by his new instruments with specific pathological changes in the chest, in effect pioneering a new non-invasive diagnostic tool. Laennec was the first to classify and discuss the terms rales, rhonchi, crepitance, and egophony – terms that doctors now use on a daily basis during physical exams and diagnoses.[4] In February 1818, he presented his findings in a talk at the Academie de Medecin, later publishing his findings in 1819.
Laennec coined the phrase mediate auscultation (indirect listening), as opposed to the popular practice at the time of directly placing the ear on the chest (immediate auscultation). He named his instrument the stethoscope, from stethos (chest), and skopos (examination).

One of the original stethoscopes belonging to Rene Theophile Laennec made of wood and brass


Not all doctors readily embraced the new stethoscope. Although the New England Journal of Medicine reported the invention of the stethoscope two years later, in 1821, as late as 1885 a professor of medicine stated, "He that hath ears to hear, let him use his ears and not a stethoscope." Even the founder of the American Heart Association, L. A. Connor (1866–1950) carried a silk handkerchief with him to place on the wall of the chest for ear auscultation.[5]
Laennec often referred to the stethoscope as "the cylinder," and as he neared death only a few years later, he bequeathed his own stethoscope to his nephew, referring to it as "the greatest legacy of my life."
The modern binaural stethoscope with two ear pieces was invented in 1851 by Arthur Leared. George Cammann perfected the design of the instrument for commercial production in 1852, which has become the standard ever since.

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