Micro perfusion device
First Claim
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1. A micro perfusion device connectable to a perfusate supply and for obtaining at least one constituent of a body fluid, the device comprising:
- a casing including a discharge channel;
a perfusion catheter including a proximal end in fluid communication with the discharge channel and a distal end having an intake opening; and
a hollow injection needle including a proximal end in fluid communication with the perfusate supply and a distal end having a discharge opening, wherein said injection needle is slideably displaceable through the casing and the perfusion catheter between a forward position and a rearward position, wherein the injection needle protrudes through and seals the intake opening of the perfusion catheter when the injection needle is in the forward position, wherein the discharge opening of the injection needle resides within the perfusion catheter and the injection needle no longer seals the intake opening of the perfusion catheter when the injection needle is in the rearward position.
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Abstract
A micro perfusion device and method for obtaining at least one constituent of a body fluid. The at least one constituent is obtained using a subcutaneously-positioned perfusion catheter into which perfusate is introduced by a supply channel and an injection needle. The perfusate absorbs the at least one constituent as it flows out of the perfusion catheter and through a discharge channel.
13 Citations
41 Claims
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1. A micro perfusion device connectable to a perfusate supply and for obtaining at least one constituent of a body fluid, the device comprising:
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a casing including a discharge channel;
a perfusion catheter including a proximal end in fluid communication with the discharge channel and a distal end having an intake opening; and
a hollow injection needle including a proximal end in fluid communication with the perfusate supply and a distal end having a discharge opening, wherein said injection needle is slideably displaceable through the casing and the perfusion catheter between a forward position and a rearward position, wherein the injection needle protrudes through and seals the intake opening of the perfusion catheter when the injection needle is in the forward position, wherein the discharge opening of the injection needle resides within the perfusion catheter and the injection needle no longer seals the intake opening of the perfusion catheter when the injection needle is in the rearward position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A micro perfusion device connectable to a perfusate supply and for obtaining at least one constituent of a body fluid, the device comprising:
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a perfusion catheter comprising a distal end including an intake opening and a proximal end in fluid communication with a discharge channel; and
a hollow injection needle comprising a distal end including a discharge opening and a proximal end adapted to be placed in fluid communication with the perfusate supply, wherein said injection needle is slideably displaceable through the perfusion catheter between an extended position and a retracted position, wherein the injection needle protrudes through the intake opening of the perfusion catheter when the injection needle is in the extended position, wherein the discharge opening of the injection needle resides within the perfusion catheter when the injection needle is in the retracted position, and wherein, when the injection needle is in the retracted position and perfusate is flowing from the discharge opening of the injection needle, body fluid is sucked into the perfusion catheter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of obtaining at least one constituent of a body fluid, comprising:
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providing a perfusion catheter comprising a proximal end in fluid communication with a discharge channel and a distal end including an intake opening;
providing a hollow injection needle slideably displaceable in the perfusion catheter and including a proximal end capable of being placed in fluid communication with a perfusate and a distal end including a discharge opening;
sealing the intake opening in the distal end of the perfusion catheter by extending the distal end of the injection needle through said intake opening; and
inserting the perfusion catheter into a tissue containing the at least one constituent when the distal end of the injection needle is protruding from the distal end of the perfusion catheter. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of obtaining at least one constituent of a body fluid, comprising:
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providing a perfusion catheter comprising a proximal end in fluid communication with a discharge channel and a distal end including an intake opening;
providing a hollow injection needle slideably displaceable in the perfusion catheter and including a proximal end capable of being placed in fluid communication with a perfusate and a distal end including a discharge opening;
extending the distal end of the injection needle through the intake opening;
inserting the perfusion catheter into a tissue containing the at least one constituent when the distal end of the injection needle is protruding from the distal end of the perfusion catheter;
retracting the injection needle until the discharge opening of the injection needle resides within the perfusion catheter; and
causing perfusate to flow from said discharge opening into the perfusion catheter. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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Specification