2598 篇
1057 篇
326809 篇
3242 篇
7544 篇
2207 篇
2753 篇
531 篇
37486 篇
9163 篇
3116 篇
739 篇
2289 篇
1311 篇
447 篇
752 篇
1386 篇
2587 篇
2739 篇
3952 篇
[科学研究和技术服务业] [2020-03-24]
[公共管理、社会保障和社会组织,教育] [2020-03-24]
[文化、体育和娱乐业] [2020-03-24]
[交通运输、仓储和邮政业] [2020-03-24]
[交通运输、仓储和邮政业,水利、环境和公共设施管理业] [2020-03-24]
[交通运输、仓储和邮政业] [2020-03-24]
[交通运输、仓储和邮政业] [2020-03-24]
[金融业] [2020-03-24]
[信息传输、软件和信息技术服务业] [2020-03-24]
[医药制造业,计算机、通信和其他电子设备制造业,仪器仪表制造业] [2020-03-24]
In the mid-20th century, the advancement in cardiac surgery has created a need and demand for an artificial source that helps in stimulating the heart muscle. Initially, the scientist developed large-size external devices causing discomfort in patients. Later, the advancement in technology has resulted in the miniaturization of electronic circuitry and eventually the development of totally implantable devices. These advancements continue till date, with the recent introduction of leadless pacemakers, that are directly implanted within the cardiac chamber.
027-87841330