Quick cycle biopsy system
First Claim
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1. A biopsy apparatus comprising:
- a housing having a proximal end and a distal end;
a cannula positioned in the housing to extend through the distal end of the housing, the cannula having a closed penetrating tip and an orifice located on a circumferential surface of said cannula, said orifice is configured to receive a tissue sample into a lumen of said cannula;
a cutting sheath positioned in the housing to extend through the distal end of the housing, the cutting sheath being slidably and coaxially disposed over said cannula, said sheath is adapted to seal the opening of said orifice;
a pressure generating device positioned in the housing and connected to a proximal portion of said cannula for altering a pressure in the lumen of said cannula, the pressure generating device configured to selectively generate each of a positive pressure and a negative pressure;
a valve positioned in the housing and positioned in fluid communication between said cannula and said pressure generating device, configured to control a fluid flow between the lumen of said cannula and said pressure generating device such that each of the positive pressure and the negative pressure selected is controlled by the valve;
a valve actuator positioned in the housing and coupled to the valve to operate the valve; and
an electronic system control coupled to the valve actuator andconfigured to control the valve actuator to close the valve to build up each of the selected positive pressure and negative pressure.
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Abstract
A method for extracting a tissue sample includes altering the pressure inside the lumen of a cannula to facilitate extraction of a tissue sample from the cannula. One aspect of the invention includes a biopsy apparatus comprising a valve for controlling the pressure inside the lumen of the cannula. In one variation, the pressure/vacuum generating device is connected to a cannula with a closed distal end and an orifice located on a circumferential surface of said cannula. A cutting sheath is slidably disposed over said cannula. The valve may be provided between the pressure/vacuum generating device and the cannula to control the pressure within the lumen of the cannula.
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Citations
13 Claims
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1. A biopsy apparatus comprising:
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a housing having a proximal end and a distal end; a cannula positioned in the housing to extend through the distal end of the housing, the cannula having a closed penetrating tip and an orifice located on a circumferential surface of said cannula, said orifice is configured to receive a tissue sample into a lumen of said cannula; a cutting sheath positioned in the housing to extend through the distal end of the housing, the cutting sheath being slidably and coaxially disposed over said cannula, said sheath is adapted to seal the opening of said orifice; a pressure generating device positioned in the housing and connected to a proximal portion of said cannula for altering a pressure in the lumen of said cannula, the pressure generating device configured to selectively generate each of a positive pressure and a negative pressure; a valve positioned in the housing and positioned in fluid communication between said cannula and said pressure generating device, configured to control a fluid flow between the lumen of said cannula and said pressure generating device such that each of the positive pressure and the negative pressure selected is controlled by the valve; a valve actuator positioned in the housing and coupled to the valve to operate the valve; and an electronic system control coupled to the valve actuator and configured to control the valve actuator to close the valve to build up each of the selected positive pressure and negative pressure. - View Dependent Claims (2, 3)
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4. A biopsy device for taking tissue samples, comprising:
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a housing having a proximal end and a distal end, the housing containing an electric power source and a tension slide connected to the power source, wherein the tension slide is brought into a cocked position against the action of a spring by the power source; a removable element configured for coupling into the housing, comprising; a biopsy cannula unit, comprising a hollow biopsy cannula positioned in the housing to extend through the distal end of the housing, the hollow biopsy cannula having a sample removal chamber and a penetrating tip, and a cutting sheath positioned in the housing to extend through the distal end of the housing, the cutting sheath being slidably and coaxially disposed over said cannula; a pressure generating device positioned in the housing, the pressure generating device configured to selectively generate each of a positive pressure and a negative pressure; a valve positioned in the housing, the valve coupled in fluid communication between the pressure generating device and the biopsy cannula unit such that each of the positive pressure and the negative pressure selected is controlled by the valve; and a first connection element that extends between the biopsy cannula unit and the valve, and configured to provide fluid communication from the valve to the biopsy cannula unit; a valve actuator positioned in the housing and coupled to the valve to operate the valve; and an electronic system control coupled to the valve actuator and configured to control the valve actuator to close the valve to build up each of the selected positive pressure and negative pressure. - View Dependent Claims (5, 6, 7, 8)
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9. A biopsy device for taking tissue samples, comprising:
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a housing containing an electric power source and a tension slide connected to the power source, wherein the tension slide is brought into a cocked position against the action of a spring by the power source; a biopsy cannula unit, comprising a hollow biopsy cannula, having a sample removal chamber, and a cutting sheath, wherein the biopsy cannula unit is arranged on the tension slide; a pressure generating device positioned in the housing, the pressure generating device configured to selectively generate each of a positive pressure and a negative pressure, the pressure generating device comprises a syringe unit having a syringe body and a plunger positioned in the syringe body, the syringe body having a ventilation opening in an upper part thereof which may be opened to dissipate a created vacuum by retraction of the plunger; a spindle actuator configured to move the plunger in a forward and a reverse direction; a valve positioned in the housing and interposed between the cannula and the pressure generating device, and configured such that each of the positive pressure and the negative pressure selected is controlled by the valve; a valve actuator positioned in the housing and coupled to the valve to operate the valve; and an electronic system control coupled to the valve actuator and configured to control the valve actuator to close the valve to build up each of the selected positive pressure and negative pressure. - View Dependent Claims (10, 11, 12, 13)
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Specification