IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0849722
(2001-05-03)
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발명자
/ 주소 |
- Florio, Joseph J.
- Hauck, Gregory
- Bornzin, Gene A.
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
9 인용 특허 :
25 |
초록
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A pacemaker or other implantable cardiac stimulation device is configured with both a rate hysteresis mode and a vasovagal syncope prevention mode. Within the rate hysteresis mode, the pacemaker detects when the intrinsic heart rate of the patient is below an escape rate, then paces the heart at a B
A pacemaker or other implantable cardiac stimulation device is configured with both a rate hysteresis mode and a vasovagal syncope prevention mode. Within the rate hysteresis mode, the pacemaker detects when the intrinsic heart rate of the patient is below an escape rate, then paces the heart at a Base Rate until an intrinsic beat is detected. When programmed in the vasovagal syncope prevention mode, upon detecting the intrinsic rate falling below the Hysteresis Escape Rate, the pacemaker paces the heart at a Vasovagal Syncope Response Rate, which is considerably higher than the Base Rate. The pacemaker is preferably set to the syncope prevention mode for patients prone to recurrent vasovagal syncope. By pacing the heart at the higher Vasovagal Syncope Response Rate, the pacemaker thereby helps prevent a significant drop in blood pressure which might otherwise cause a loss of consciousness in the patient. System and method embodiments are described.
대표청구항
▼
A pacemaker or other implantable cardiac stimulation device is configured with both a rate hysteresis mode and a vasovagal syncope prevention mode. Within the rate hysteresis mode, the pacemaker detects when the intrinsic heart rate of the patient is below an escape rate, then paces the heart at a B
A pacemaker or other implantable cardiac stimulation device is configured with both a rate hysteresis mode and a vasovagal syncope prevention mode. Within the rate hysteresis mode, the pacemaker detects when the intrinsic heart rate of the patient is below an escape rate, then paces the heart at a Base Rate until an intrinsic beat is detected. When programmed in the vasovagal syncope prevention mode, upon detecting the intrinsic rate falling below the Hysteresis Escape Rate, the pacemaker paces the heart at a Vasovagal Syncope Response Rate, which is considerably higher than the Base Rate. The pacemaker is preferably set to the syncope prevention mode for patients prone to recurrent vasovagal syncope. By pacing the heart at the higher Vasovagal Syncope Response Rate, the pacemaker thereby helps prevent a significant drop in blood pressure which might otherwise cause a loss of consciousness in the patient. System and method embodiments are described. n. 3. The mobile communication system of claim 2 wherein each of said routers is arranged to transmit a paging message to the corresponding wireless access network if the specified mobile station is not found in said memory for requesting a reply from the specified mobile station. 4. The mobile communication system of claim 2, wherein the reply message contains data necessary for routing said packet to one of said routers, and wherein said gateway includes a memory for receiving said data from each of said routers and storing the received data in the memory, said gateway routing a packet received from said data network according to the data stored in the memory. 5. The mobile communication system of claim 2, wherein the data stored in the memory of each of said routers contains an IP (Internet Protocol) address of the specified mobile station. 6. The mobile communication system of claim 2, wherein each of said wireless access networks comprises a group of cell-site base stations connected to a corresponding one of said routers to establish said wireless links with mobile stations located within coverage areas of the base stations. 7. The mobile communication system of claim 1, wherein said gateway is arranged to: receive a series of packets of same destination from the connectionless data network, transmit a request message to all of said routers in response to receipt of the packet of first arrival for requesting a search for a mobile station specified by the packet of first arrival, transmit the packet of first arrival to one of the routers which responds with a reply message, transmit the packet of second arrival to the responding router if the packet of second arrival is received before a predetermined time interval expires, and transmit a disconnect signal to the responding router if said predetermined time interval expires after the transmission of each of the packets of first and second arrival, each of said routers is arranged to: respond to said request message with said reply message if the specified mobile station is found in said memory to receive the packets of first and second arrival and establish a connection to the specified mobile station via the corresponding wireless access network, and transmit the received packets to the specified mobile station over the established connection, and clear said connection in response to said disconnect signal. 8. The mobile communication system of claim 7, wherein each of said routers is arranged to transmit a paging message to the corresponding wireless access network if the specified mobile station is not found in said memory for requesting a reply from the specified mobile station. 9. The mobile communication system of claim 7, wherein the reply message contains data necessary for routing said packet to one of said routers, and wherein said gateway includes a memory for receiving said data from each of said routers and storing the received data in the memory, said gateway routing a packet received from said data network according to the data stored in the memory. 10. The mobile communication system of claim 7, wherein the data stored in the memory of each of said routers contains an IP (Internet Protocol) address of the specified mobile station. 11. The mobile communication system of claim 7, wherein each of said wireless access networks comprises a group of cell-site base stations connected to a corresponding one of said routers to establish said wireless links with mobile stations located within coverage areas of the base stations. 12. The mobile communication system of claim 1, wherein each of said routers is arranged to transmit a paging message to the corresponding wireless access network if the specified mobile station is not found in said memory for requesting a reply from the specified mobile station. 13. The mobile communication system of claim 1, wherein the reply message contains data necessary for routing said packet to one of said routers, a nd wherein said gateway includes a memory for receiving said data from each of said routers and storing the received data in the memory, said gateway routing a packet received from said data network according to the data stored in the memory. 14. The mobile communication system of claim 1, wherein the data stored in the memory of each of said routers contains an IP (Internet Protocol) address of the specified mobile station. 15. The mobile communication system of claim 1, wherein each of said wireless access networks comprises a group of cell-site base stations connected to a corresponding one of said routers to establish said wireless links with mobile stations located within coverage areas of the base stations. 16. The mobile communication system of claim 15, wherein said gateway is co-located with a mobile switching center which is connected to a public switched telephone network. 17. The mobile communication system of claim 16, wherein each of said routers is co-located with a base station controller which is connected to said mobile switching center. 18. A method of communication for a system comprising a gateway connected to a connectionless data network, a plurality of routers connected to said gateway, and a plurality of wireless access networks, connected respectively to said routers, for establishing wireless links with mobile stations, each of said routers including a memory for storing location data of mobile stations, the method comprising the steps of: a) receiving a packet of first arrival from the connectionless data network at said gateway; b) transmitting a request message from said gateway to all of said routers in response to receipt of the packet for requesting a search for a mobile station specified by the packet of first arrival; c) making a search through the memory of each of the routers in response to said request message from the gateway; d) receiving, at one of said routers, said packet from the gateway if the specified mobile station is found in the memory of said one router; and e) routing the received packet via the corresponding wireless access network to the mobile station. 19. The method of claim 18, wherein the step (c) comprises the step of transmitting a paging message from said one router to the corresponding wireless access network if the specified mobile station is not found in the memory of said one router for requesting a reply from the specified mobile station. 20. A method of communication for a system comprising gateway connected to a connectionless data network, a plurality of routers connected to said gateway, and a plurality of wireless access networks, connected respectively to said routers, for establishing wireless links with mobile stations, each of said routers including a memory for storing location data of mobile stations, the method comprising the steps of: a) receiving, at said gateway, packets of first and second arrival of same destination from the connectionless data network; b) transmitting a request message from said gateway to all of said routers in response to receipt of the packet of first arrival for requesting a search for a mobile station specified by the packet of first arrival; c) making a search through the memory of each of the routers in response to said request message from the gateway; d) transmitting a reply message from one of said routers to said gateway if the specified mobile station is found in the memory of said one router; e) transmitting said packets from the gateway to said one router in response to said reply message; and f) receiving, at said one router, said packets from the gateway and routing the received packets via the corresponding wireless access network to the mobile station. 21. The method of claim 20, wherein the step (c) comprises the step of transmitting a paging message from said one router to the corresponding wireless access network if the specified mobile station is not found in the memory of said one route
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