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US 2007/0179403 A1Published application
Coaxial cannula provided with a sealing element
AssigneeC.R. Bard, Inc.
InventorsNorbert Heske, Thomas Heske
Life of this patent
Estimating the term…
Abstract
The invention relates to a coaxial cannula for extracting samples from tissue comprising a biopsy needle unit provided with a space for sample extraction and a sample separation unit which coaxially encompasses the biopsy needle on an external wall and is longitudinally movable. The inventive coaxial cannula comprises a sealing element which is arranged on the proximal end thereof and closes the space between the internal wall of the coaxial cannula and the external walls of the sample separation unit. The sealing element opens an air outlet when the biopsy needle unit is inserted, and prevents air intake when the biopsy needle unit is positioned and vacuum is produced in the internal chamber of the biopsy needle.
Claims76
1-4. (canceled)
A biopsy needle insertion aid, comprising:
- a cannula that is insertable in a host
- the cannula having a lumen configured to accept a biopsy needle having a predefined outer diameter therewithin;
- the cannula having a proximal end and a distal end;
- a flexible sealing element with an opening having a diameter smaller than the predefined outer diameter and closing a space between the lumen and the opening;
- the sealing element being configured such that when a cylinder having the predefined diameter is inserted in the opening, it takes a greater pressure for air to flow through the lumen and bypass the sealing element if the air flows from the proximal end to the distal end than if it flows from the distal end to the proximal end.
2 more elements
A biopsy needle insertion aid, comprising:
- a cannula that is insertable in a host;
- the cannula having a lumen configured to receive therewithin a biopsy needle having a predefined outer diameter;
- the cannula having a proximal end and a distal end;
- a flexible sealing element with an opening having a diameter smaller than the predefined outer diameter and closing a space between the lumen and a biopsy needle of the predefined diameter inserted in the opening;
- the sealing element being configured such that, when a cylinder of the predefined diameter is in the opening, air forced in such a manner as to tend to flow between the cylinder and the lumen through the sealing element from the cannula distal end to the cannula proximal end tends to weaken a seal between the cylinder and the sealing element and air forced in such a manner as to tend to flow between the cylinder and the lumen through the sealing element from the cannula proximal end to the cannula distal end tends to strengthen the seal between the cylinder and the sealing element.
2 more elements
A biopsy needle insertion aid, comprising:
- a cannula that is insertable in a host
- the cannula having a lumen configured to accept a biopsy needle having a predefined outer diameter therewithin;
- the cannula having a proximal end and a distal end;
- a flexible sealing element with an opening having a diameter smaller than the predefined outer diameter and closing a space between the lumen and the opening;
- the sealing element being configured such that a negative pressure in a gap between a cylinder of the predefined diameter inserted in the opening and the lumen causes the sealing element to act as a seal against the cylinder, thereby preventing flow from the proximal end to the distal end.
2 more elements
A biopsy needle with an insertion aid, comprising:
- a cannula that is insertable in a host;
- a biopsy needle having a predefined outer diameter and carrying a stopper at an intermediate point along it length;
- the cannula having a lumen at least as large as the predefined diameter and configured to accept the biopsy needle therewithin;
- the cannula having a proximal end and a distal end;
- the cannula proximal end having a hub with a recess;
- a stopper with a cylindrical body having a channel and a first compression seal within the channel sized to seal against the biopsy needle of the predefined diameter, the stopper cylindrical body having a second compression seal sized to seal against hub recess such that a seal is formed between the hub and the biopsy needle when the biopsy needle is inserted sufficiently that the stopper cylindrical body enters the hub recess.
3 more elements
A biopsy needle insertion aid, comprising:
- a cannula that is insertable in a host
- the cannula having a lumen configured to receive therewithin a biopsy needle having a predefined outer diameter;
- the cannula having a proximal end and a distal end;
- a flexible sealing element with an opening having a diameter smaller than the predefined outer diameter and closing a space between the lumen and a biopsy needle of the predefined diameter inserted in the opening;
- the sealing element being configured such that, when a cylinder of the predefined diameter is in the opening, air forced in such a manner as to tend to flow between the cylinder and the lumen through the sealing element from the cannula distal end to the cannula proximal end tends to weaken a seal between the cylinder and the sealing element and air forced in such a manner as to tend to flow between the cylinder and the lumen through the sealing element from the cannula proximal end to the cannula distal end tends to strengthen the seal between the cylinder and the sealing element.
2 more elements
A biopsy needle insertion aid, comprising:
- a cannula that is insertable in a host,
- the cannula having a lumen configured to accept a biopsy needle having a predefined outer diameter therewithin;
- the cannula having a proximal end and a distal end;
- a flexible sealing element with an opening having a diameter smaller than the predefined outer diameter and closing a space between the lumen and the opening;
- the sealing element being configured such that a negative pressure in a gap between a cylinder of the predefined diameter inserted in the opening and the lumen causes the sealing element to act as a seal against the cylinder, thereby preventing flow from the proximal end to the distal end.
2 more elements
A biopsy needle with an insertion aid, comprising:
- a cannula that is insertable in a host;
- a biopsy needle having a predefined outer diameter and carrying a stopper at an intermediate point along it length;
- the cannula having a lumen at least as large as the predefined diameter and configured to accept the biopsy needle therewithin;
- the cannula having a proximal end and a distal end;
- the cannula proximal end having a hub with a recess;
- a stopper with a cylindrical body having a channel and a first compression seal within the channel sized to seal against the biopsy needle of the predefined diameter, the stopper cylindrical body having a second compression seal sized to seal against hub recess such that a seal is formed between the hub and the biopsy needle when the biopsy needle is inserted sufficiently that the stopper cylindrical body enters the hub recess.
3 more elements
A method of performing a biopsy, comprising:
- inserting a cannula into a host whose tissue is to be sampled;
- inserting a biopsy needle in the cannula;
- providing a seal between the biopsy needle and the cannula such that egress of fluid out of the cannula may occur at a lower pressure difference than ingress of fluid into the cannula.
A method of performing a biopsy, comprising:
- inserting a cannula into a host whose tissue is to be sampled;
- inserting a biopsy needle in the cannula;
- providing a seal that includes a one-way valve between the biopsy needle and the cannula such that more pressure is required for fluid to egress out of the cannula than for fluid to ingress into the cannula;
- generating a negative pressure in a sample chamber of the biopsy needle;
- and
- exposing an opening of the sample chamber after the negative pressure reaches a predefined level.
3 more elements
Dependencies are inferred from the claim text.