Blood aspiration assembly and method
First Claim
1. A blood aspiration assembly for use with a blood removal means inserted in a blood vessel of a patient and a separate aspirating means to remove blood from a patient, comprising:
- (a) means for providing a reservoir having a maximum displacement volume;
(b) an aspirator receiver means having a chamber for permitting blood flow therein;
(c) means for providing a first conduit for connecting the blood removal means to the aspirator receiver means so that the first conduit means is in liquid flow connection with the receiver chamber;
(d) means for providing a second conduit connecting the aspirator receiver to the reservoir means so that the second conduit means can be in liquid flow connection with the receiver chamber;
the second conduit means having an internal volume which is greater than the maximum displacement volume of the reservoir;
(e) the aspirator receiver having a portion for receiving a part of the aspirating means to allow the aspirating means to be in blood flow connection with the aspirator receiver chamber so that blood drawn into the receiver chamber and into the first conduit means can be withdrawn from the aspirator receiver chamber and the first conduit means into the aspirating means.
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Accused Products
Abstract
A blood aspiration assembly and method has proximal, intermediate and distal tubing, a reservoir having an adjustable volume and an aspirator receiver. A two-way valve can connect the reservoir to the intermediate tube and block flow to the proximal tubing, or can connect the intermediate and proximal tubing while blocking flow to the reservoir. The reservoir can be locked into selected withdrawal and discharge positions. The intermediate tube is connected with the aspirator receiver. The receiver is connected with the distal tubing. The receiver has a housing comprising a rigid casing and a resilient plug. The valve and reservoir can be operated to withdraw resident fluid from the assembly flow channels distal thereto into the reservoir, and draw blood from the patient into the intermediate tube to remove resident fluid from the aspiration chamber. A needle from a separate syringe is inserted through the plug into the aspirator chamber and a blood sample withdrawn. The reservoir has a predetermined potential maximum fluid volume equal to that volume which, when withdrawn into the reservoir from the intermediate tube, results in the replacement of essentially all resident fluid in the aspiration chamber and that portion of the apparatus distal to the aspiration chamber by essentially undiluted blood. The reservoir volume is less than the total internal volume of the apparatus distal to the reservoir whereby withdrawal of fluid into the reservoir does not cause blood to flow into the reservoir. The intermediate tube can have an enlarged section of be spiralled.
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Citations
59 Claims
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1. A blood aspiration assembly for use with a blood removal means inserted in a blood vessel of a patient and a separate aspirating means to remove blood from a patient, comprising:
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(a) means for providing a reservoir having a maximum displacement volume; (b) an aspirator receiver means having a chamber for permitting blood flow therein; (c) means for providing a first conduit for connecting the blood removal means to the aspirator receiver means so that the first conduit means is in liquid flow connection with the receiver chamber; (d) means for providing a second conduit connecting the aspirator receiver to the reservoir means so that the second conduit means can be in liquid flow connection with the receiver chamber;
the second conduit means having an internal volume which is greater than the maximum displacement volume of the reservoir;(e) the aspirator receiver having a portion for receiving a part of the aspirating means to allow the aspirating means to be in blood flow connection with the aspirator receiver chamber so that blood drawn into the receiver chamber and into the first conduit means can be withdrawn from the aspirator receiver chamber and the first conduit means into the aspirating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24)
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23. The blood aspiration assembly of claim 23 wherein in the preamble the blood removal means comprises a needle;
- and the body of the claim further comprising a cap, means for securing the cap to the extension, the cap having a hole for alignment with the resilient portion so that a needle can pass through the cap hole through the resilient portion and into the chamber.
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25. A blood aspiration assembly for use with an insertion catheter to be inserted in a blood vessel of a patient and a separate aspirating means with a needle having a bore to remove blood from a patient, comprising:
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(a) means for providing a reservoir, the reservoir having means to vary the internal volume of the reservoir and a maximum displacement volume; (b) means for receiving the separate aspirating needle, the said receiving means having a chamber for permitting blood flow therethrough, the receiving means comprising a housing which includes a rigid casing and a resilient portion associated with the casing, the resilient portion being positioned with the casing so that the separate aspiration needle can penetrate the resilient portion to enter the chamber to be in liquid flow communication therewith; (c) means for providing a first conduit for connecting the catheter to the receiving means so that the first conduit means is in liquid flow connection with the receiver chamber; (d) means for providing a second conduit for passing liquid in either direction, the second conduit means connecting the receiver to the reservoir means so that the second conduit means can be placed in liquid flow connection with the receiving means chamber, the second conduit means having an internal volume which is greater than the maximum displacement volume of the reservoir; (e) means for providing a third conduit; (f) a valve connected between the reservoir and the second conduit means, the valve having means for being placed in a first position so that the reservoir means is in liquid flow connection with the second conduit, and the valve having means to be placed in a second position to place the third conduit means in liquid flow connection with the second conduit means; (g) the reservoir having means for creating a pressure differential to cause liquid to flow from the second conduit into the reservoir means when the valve connects the reservoir means to the second conduit for liquid flow therebetween; and (h) means for inhibiting liquid flow in the second conduit means so that when said means inhibits flow in the second conduit and when blood is aspirated from the receiver chamber through the needle into the separate aspirating means, additional blood flowing into the receiver chamber and into the first conduit comes from the patient and substantial blood does not flow from the second conduit into the aspirating means. - View Dependent Claims (26)
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27. A method of aspirating blood from a human through the use of blood removal means connected to a first conduit, the first conduit being connected to an aspirator receiver having a chamber, the said chamber connected to a second conduit, the second conduit connected to a reservoir, the reservoir having a maximum displacement volume, the first conduit, the aspirator receiver chamber, and the second conduit being filled with intravenous fluid;
- and through use of a separate aspirating means having a needle, comprising the steps of;
(a) causing a volume of intravenous fluid to flow through the second conduit into the reservoir which volume of fluid is less than the internal flow volume of the second conduit and which volume is equal to the maximum displacement volume of the reservoir, the said flow of intravenous fluid causing a volume of blood equal to the maximum displacement volume of the reservoir to enter the first conduit, the receiver chamber and a portion of the second conduit so that blood does not flow into the reservoir; (b) inhibiting flow of fluid toward the receiver chamber from the second conduit; (c) inserting the needle from the separate aspirating means into the receiver chamber and aspirating blood therefrom and withdrawing the needle from the receiver; and (d) substantially sealing the aspirator receiver about the entry point of the separate aspirating needle.
- and through use of a separate aspirating means having a needle, comprising the steps of;
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29. An assembly for use with a blood removal means inserted in a blood vessel of a patient, for repetitive isolation of a volume of blood for testing or sampling, comprising:
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(a) means for providing an enclosed flow channel capable of being filled with liquid, the said flow channel having means for being in liquid flow connection with the blood removal means, and means for being in liquid flow connection with a liquid source having a pressure greater than the pressure within the said blood vessel; (b) the channel having a blood analysis section; (c) means for providing a reservoir, the reservoir means having a maximum displacement volume, the reservoir means further having means for withdrawing a volume of blood equal to said maximum displacement volume from the blood vessel into said channel; (d) means for retaining all of said displacement volume of blood entering the assembly within the flow channel when the withdrawing means withdraws a volume of blood equal to the maximum displacement volume of the reservoir means; (e) means for returning essentially all the said displacement volume of the blood in the flow channel back through the blood removal means into the patient'"'"'s said blood vessel, the returning blood being moved in a direction within the said flow channel that is opposite the direction of blood entry into the flow channel. - View Dependent Claims (28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An assembly for use with a blood removal means inserted in a blood vessel of a patient, for repetitive isolation of a volume of blood for testing or sampling, comprising:
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(a) means for providing an enclosed flow channel capable of being filled with liquid and for passing liquid in either direction, the said flow channel having means for being in liquid flow connection with the blood removal means, and means for being in liquid flow connection with a liquid source having a pressure greater than the pressure within the said blood vessel; (b) the channel having a blood analysis section, the said section having means for receiving a means for aspiration of blood for sampling; (c) means for providing a reservoir, the reservoir means having a maximum displacement volume, the reservoir means further having means for withdrawing a volume of blood equal to said maximum displacement volume from the blood vessel into said channel; (d) means for providing a flow channel capacitance segment, the said segment being intermediate the reservoir and the analysis segment, wherein intravenous liquid can initially be received within the capacitance segment channel, the said segment having an internal volume which is greater than the maximum displacement volume of the reservoir; (e) means for returning essentially all the said displacement volume of the blood in the flow channel back through the blood removal means into the patient'"'"'s said blood vessel, the returning blood being moved in a direction within the said flow channel that is opposite the direction of blood entry into the flow channel.
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46. In a blood aspiration assembly having a blood removal means with a set internal flow volume, the blood removal means being for insertion in a blood vessel of a patient, and a separate aspirating means for removing blood from a patient,
(a) means for providing a reservoir having a displacement volume and means for indicating when a specific displacement volume has entered the reservoir; -
(b) means for providing an aspirator receiver having a chamber for permitting blood flow therein; (c) means for providing a first conduit for connecting the blood removal means to the aspirator receiver means so that the first conduit means is in liquid flow connection with the receiver chamber; (d) means for providing a second conduit for passing liquid in either direction, the second conduit means connecting the aspirator receiver means to the reservoir means so that the second conduit means can be in liquid flow connection with the receiver chamber; (e) the aspirator receiver means having a portion for receiving a part of the aspirating means to allow the aspirating means to be in blood flow connection with the aspirator receiver chamber so that blood drawn into the receiver chamber and into the first conduit means can be withdrawn from the aspirator receiver chamber and the first conduit means into the aspirating means; (f) means for making a predesignated volume of blood to flow from the blood vessel into the blood removal means, into the first conduit means, and into the aspiration receiver chamber, and into a portion of the second conduit means;
the second conduit means providing a capacitance function so that blood does not flow into the reservoir means;
the predesignated volume of blood being equal to the said specific displacement volume of the reservoir and which is equal at least to the internal flow volume of the blood removal means, the first conduit means and the aspirator receiver chamber; and(g) the predesignated volume of blood being less than the internal flow volume of the blood removal means, the first conduit means, the aspirator receiver chamber, and second conduit means. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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Specification