摘要:
An electronically controlled intravenous infusion set of the gravity feed type having a flow path including a drip chamber and an internal valve for regulating flow through the set. Electromagnetic valve operating structure, positioned outside the IV set, controls the internal valve in response to an electronic control system. The electronic control system serves to open the valve to allow a drop to fall, and includes a control circuit. The control circuit includes an optical drop detector, associated with but positioned outside the drip chamber, which senses the falling drop and signals the control circuit to close the valve. The control circuit also includes a variable frequency clock and associated digital selectors for affording an attendant the ability to precisely select a desired drip rate. An alarm system, operating on digital principles, senses high drop rate or low drop rate conditions and, in response thereto, puts the control system into an alarm condition. The alarm system includes means for digitally adjusting the sensitivity thereof to provide high sensitivity at low drip rates but to decrease the sensitivity at higher rates so that premature alarm conditions are avoided.
摘要:
Electronic control apparatus for controlling the administration of a plurality of separate fluids independently and consecutively, includes electrical circuitry connected with a plurality of valve operators to operate valves in a plurality of sets to control flow therethrough.
摘要:
An electronically controlled, gravity-feed, intravenous infusion set in which a length of intravenous tubing is connected with a drip chamber to convey a fluid to be administered intravenously, the improvement comprising a normally closed internal valve in said set operable to prevent flow of fluid through the set and operated to open position to enable passage of a drop of fluid through the set, and an electrically controlled actuator operatively associated with the valve to operate the valve to its open position at a predetermined frequency of operation and to hold the valve open until a drop forms and falls to thus determine the drip rate of fluid through the set, said internal valve thus enabling control of flow of fluid through the set without necessitating crimping or other deformation of the set and thereby resulting in dependable and accurate control of the flow rate of the fluid to be administered intravenously.
摘要:
A method and apparatus for transferring data units between a host memory and a peripheral interface, the data units being subject to a flow control mechanism whereby some of said data units are flow controlled and some of said data units are not. Two transmit buffer memories are coupled to the peripheral interface; one for storing controlled data units to be transferred to the peripheral interface and the other for storing uncontrolled data units to be transferred to the peripheral interface. A single request buffer stores successive requests for data to be transferred from a host memory to either of the two transmit buffer memories. Data transfer circuitry transfers data from the host memory to either of the two transmit buffer memories in response to the requests stored in the request buffer. The data transfer circuitry is prevented from transferring further data from the host memory to the transmit buffer memory storing the controlled data units when it is determined that there is not enough room in the transmit buffer memory storing the controlled data units to accommodate another data unit. The data transfer circuitry is allowed, however, to transfer further data from the host memory to the transmit buffer memory storing the uncontrolled data units.
摘要:
In a network node having a host system coupled to a network by an adapter, VC-specific congestion is detected and reported to the host system. The host memory includes rx slots or buffers, each corresponding to one of one or more supported slot types. Per-VC slots consumed counters are maintained to count slot consumption for each active VC. Free buffer FIFOs are maintained for each of the one or more slot types, which have a predetermined congestion threshold associated therewith. Entries in each free buffer FIFO correspond to an rx slot posted by the host system. When a new rx slot or buffer in host memory is to be allocated to an incoming cell received on a given VC, the slots consumed counter is compared to the predetermined congestion threshold. If they are equal, the VC is at threshold level and the incoming cell is discarded and a report is sent to the host system. If the slots consumed counter is below threshold, a new rx slot is allocated for the reception of the data and the slots consumed counter is incremented. If the VC is credit-based flow control enabled and the slots consumed counter is below threshold, a credit is returned. If the VC is credit-based flow control enabled and the slots consumed counter is greater than or equal to the threshold, the credit return is deferred until the counter falls below threshold.
摘要:
A status report frequency mitigation mechanism for mitigating the frequency of status report generation for raw cells during transmit operations in a network node is presented. The status report frequency mitigation mechanism operates to adjust the frequency with which status reports for raw cells are generated by manipulating the End-of-Packet (EOP) bit in transmit slot descriptors associated with transmit slots containing raw cell data.
摘要:
The present invention provides multiple grade, composite cemented carbide articles and a method of making such articles. The cemented carbide articles comprise carbides of different grades (or different compositions and/or microstructures) and, therefore, correspondingly different properties at different locations in the same article. The method of the present invention comprises filling different areas or portions of a die with metallurgical powders having different compositions and/or microstructures. The powder is then compressed as a single compact in the die cavity. The compressed compact is subsequently sintered to produce a multigrade cemented carbide article having composition and/or microstructural variations within the volume of the article.
摘要:
An arbitration mechanism for controlling a coupling order between a number of resources and a number of requesters having a number of requests processing units, one associated with each one of the requesters, for receiving a resource type request signal from the associated requester, a number of grant processing units, one associated with each one of the resources, for monitoring a busy status signal from said associated resource, a common broadcast medium coupled to the number of request processing units and the grant processing units, and an arbiter for granting access to said common broadcast medium to one of the request processing units and the grant processing units using the common broadcast medium to control the coupling order between the requesters and the resources in a first come, first served manner.
摘要:
A mechanism for avoiding an initiation of control read transactions on a system bus coupling a host system having a host memory and an interface connected to a peripheral unit as data is moved between the host system and the peripheral unit is presented. Control information associated with data memory portions in host memory is written to the interface for data memory portions storing outgoing data and data memory portions to receive incoming data. The interface includes a controller to move data between the host memory and the interface by first obtaining the control information for the associated data portions. The interface writes status reports in association with the movement of data between the interface and the host memory via the system bus. The mechanism thus enables data transfers to occur via the system without the initiation of control reads in absence of an exception condition.