Surgery – Instruments – Internal pressure applicator
Patent
1998-10-26
2000-06-06
Buiz, Michael
Surgery
Instruments
Internal pressure applicator
604176, A61M 2900
Patent
active
060712953
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to the improvement of a device to hold an anastomotic site of coronary artery motionless and bloodless for the bypass operation, more in details, it relates to said device wherein the coronary artery bypass operation can be securely performed on the beating heart with an anastomotic site of the artery motionlessly and bloodlessly held in a safe and stable fashion.
The coronary artery (C) is a blood vessel to supply blood containing oxygen and nutrition to the myocardium of the heart (H) in order to keep the heart in good shape and consists of a right coronary artery (16)and a left coronary artery (7) both originating from the foot of sinus aortae (8). If there happens malfunction in the coronary artery (9) such as stenosis, occlusion and contracture, etc., the blood circulation of the artery is interrupted so that the discrepancy arises between the quantity of oxygen and nutrition actually supplied to the myocardium and that normally required therefore, with the result that ischemic heart diseases such as primary (cardiac arrest, angina pectoris, myocardial infarction, heart failure and arrythmia are invited and those who suffer from those diseases go in peril of their lives.
2. Prior Art
In light of the foregoing, it has been recently recognized that coronary artery bypass surgery is effective to cure those who suffer from such ischemic heart diseases as mentioned above. As a result of it, this surgery has become popular among the cardiovascular surgery practitioners.
In this connection, there are such well-known methods of the coronary artery surgery as a so-called "venous bypass grafting" whereby a circumventive blood vessel is formed by bypassing a venous blood vessel excised from the lower limb between the proximal side of the artery (in the direction of sinus aortae) and the distal side thereof. In addition, there is a so-called "in situ arterial grafting" whereby an appropriate arterial blood vessel such as an internal thoracic artery is led for anastomosis to the distal side of the coronary artery, which has fallen short of oxygen due to deteriorated blood circulation, thereby, supplying arterial blood to the distal side thereof. However, the former grafting method whereby a special circumventive blood vessel is formed between the proximal side and the distal side as mentioned above is not good at grafting patency in the long run because venous valves subsist in the venous blood vessel excised from the lower limb. Under the circumstances, there is a recent tendency for the cardiovascular surgery practitioners to rather use the latter grafting method than the former. In turn, even in the latter grafting method utilizing an arterial blood vessel, there are some cases where a so-called "free arterial grafting" is performed whereby an arterial blood vessel is excised in the same way as the former so as to form a circumventive vessel between the proximal side of the artery (in the direction of sinus aortae) and the distal side thereof. In this case, it is an arterial blood vessel that is used as a grafting material, but it is much inferior to the latter grafting method because the vessel cells become extinct after the vessel has been excised, though it could be better than the former. For this reason, except for insignificant coronary artery related diseases, the latter method is normally adopted for such coronary artery diseases as being likely to risk the patients' lives.
Not to change the subject, even with such latest grafting method as "in situ arterial grafting" as mentioned above, the coronary artery bypass surgery is performed by using a lung-heart machine with the patients' heartbeat halted. This is because it is prerequisite to temporarily halt the heart for accurate dissection and anastomosis in view of the fact that arterial blood is incessantly pressurized to flow into the coronary artery in addition to the fact that said artery has so small diameter of 1 mm to 2.5 mm that careful surgical operation must be perfor
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Buiz Michael
Goldberg Jonathan Do
Learn June M.
Medivas OPCAB, Inc.
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