Apparatus and method for efficient blood sampling with lancet
First Claim
1. An apparatus for sampling blood from body tissue, comprising:
- (a) a lancet for lancing the body tissue to result in a wound for bleeding;
(b) a housing operatively connected to the lancet and shielding the lancet before lancing, the housing having an internal channel and a head for contacting the body tissue in an air-tight manner against suction forces, the housing having a piston which has sliding motion along the housing when implementing suction at the head in the reduction of air pressure at the body tissue prior to lancing the body tissue to create a wound; and
(c) a driver for driving the lancet toward the body tissue for lancing while the body tissue is under suction.
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Accused Products
Abstract
A technique for efficiently sampling blood from body tissue by reducing pressure on the body tissue. In the present technique a body tissue is placed under reduced pressure to improve perfusion of blood in the body tissue before lancing. An embodiment of this apparatus includes a lancet carried by a piston slidable in a housing, a mechanism for transmitting mechanical energy internally in the apparatus for creating the reduced pressure on the body tissue. The apparatus also includes a driver that drives the lancet for lancing. The apparatus has a head in the housing for contacting the body tissue in an air-tight manner against suction forces. In the head facing the body tissue is a channel in which the air pressure can be reduced.
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Citations
24 Claims
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1. An apparatus for sampling blood from body tissue, comprising:
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(a) a lancet for lancing the body tissue to result in a wound for bleeding;
(b) a housing operatively connected to the lancet and shielding the lancet before lancing, the housing having an internal channel and a head for contacting the body tissue in an air-tight manner against suction forces, the housing having a piston which has sliding motion along the housing when implementing suction at the head in the reduction of air pressure at the body tissue prior to lancing the body tissue to create a wound; and
(c) a driver for driving the lancet toward the body tissue for lancing while the body tissue is under suction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 24)
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13. A method for sampling blood from a body tissue, comprising the steps of:
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(a) providing a lancing device which has a lancet for lancing and has a head with an opening for receiving blood from sampling and further having a housing with a channel in the lancing device extending longitudinally therein, the housing having a slidable piston therein, the piston carrying the lancet;
(b) applying the head with the opening against the body tissue and reducing air pressure in the channel at the head and on the body tissue to a pressure less than the ambient pressure while slidably moving the piston along the housing away from the head; and
(c) after step (b), puncturing the body tissue with the lancet. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for sampling blood from a body tissue, comprising the steps of:
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(a) providing a lancing device which has a lancet for lancing and has a head with an opening for receiving blood from sampling and further having a housing with a channel in the lancing device extending longitudinally therein, the housing having a piston disposed in the channel;
(b) applying the head with the opening against the body tissue and reducing air pressure in the channel at the head and on the body tissue to a pressure less than the ambient pressure, wherein the step of reducing air pressure in the channel at the head and on the body tissue comprises the substep of sucking air through a passage extending longitudinally through the piston from the head to a suction source proximate to a portion of the lancing device remote from the head to effect a reduced pressure in the channel at the head, the piston being slidable in the lancet device and carrying the lancet such that the reduced pressure at the head causes the piston to slide towards the body tissue for lancing; and
(c) after step (b), puncturing the body tissue with the lancet.
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21. A method for inserting a lancet through the body tissue of a patient, comprising the steps of:
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(a) providing a lancing device having a housing and a lancet carried by a slidable piston therein, the housing having a head and a channel extending longitudinally in the housing and leading to an opening in the head, the head for the lancet to extend therein for lancing, the opening having a ridge encircling a depression for receiving blood;
(b) applying the housing with the ridge against the body tissue, such that the body tissue reaches into the depression;
(c) reducing the air pressure on the body tissue to a pressure less than the ambient pressure by one of mechanically drawing air and sliding the piston from the head to a rear portion of the housing through the channel, wherein the air pressure on the body tissue is being reduced while the piston is sliding along the housing;
(d) after the step (c) of reducing the air pressure on the body tissue, puncturing the body tissue with the lancet by extending the lancet in the channel forward in the opening to not pass the end of the ridge; and
(e) receiving blood into the depression from the body tissue.
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22. An apparatus for sampling blood from body tissue, comprising:
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(a) a lancet for lancing the body tissue to result in a wound for bleeding;
(b) a housing operatively connected to the lancet and shielding the lancet before and during lancing, the housing having an internal channel and a head for contacting the body tissue in an air-tight manner against suction forces, the housing having a piston which can be slid in the housing in a direction away from the head to implement suction at the head on the body tissue in the reduction of air pressure at the body tissue prior to lancing the body tissue to create a wound; and
(c) a driver for driving the piston to push the lancet toward the body tissue for lancing while the body tissue is under suction, the lancet not extending beyond the head during lancing.
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23. An apparatus for sampling blood from body tissue, comprising:
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(a) a lancet for lancing the body tissue to result in a wound for bleeding;
(b) a housing operatively connected to the lancet and shielding the lancet before lancing, the housing having an internal channel and a head for contacting the body tissue in an air-tight manner against suction forces, the housing having a piston which has sliding motion along the housing when implementing suction at the head in the reduction of air pressure at the body tissue prior to lancing the body tissue to create a wound, the piston being in rigid relation to the lancet and has a channel extending longitudinally from proximate to the head to proximate to the rear portion allowing air to pass from the head through the piston to a suction source at the rear portion to reduce pressure in the channel at the head, thereby sliding the piston towards the head by suction from the suction source; and
(c) a suction source for moving the lancet toward the body tissue for lancing while the body tissue is under suction.
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Specification