Methods and apparatus for securing medical instruments to desired locations in a patient's body
Devices and methods are provided for securely affixing a medical instrument to desired tissue in a patient's body, using a fixation agent. Such medical instruments may comprise localization wires or tissue acquisition instruments, such as biopsy instruments, for example. In the case of tissue acquisition instruments, the inventors have discovered significant advantages for securely affixing the distal end of the tissue acquisition instrument to a particular tissue target area. For example, such an approach permits the imaging environment to be uncoupled from the procedural environment so that expensive and often unavailable imaging equipment, such as stereotactic imaging equipment, need not be used. In a preferred embodiment, a bonding agent, such as adhesive, surgical glue, or a solvent, is used as the fixation agent.
The present invention relates to methods and devices for ensuring that a medical instrument remains in a desired location within a patient's body during a medical procedure, and more particularly to methods and devices for affixing a distal end of the medical instrument to the desired location using adhesives.
BACKGROUND OF THE INVENTIONIt is often desirable and frequently necessary to sample or remove a portion of tissue from humans and other animals, particularly in the diagnosis and treatment of patients with cancerous tumors, pre-malignant conditions, and other diseases or disorders.
Typically, in the case of cancer, particularly cancer of the breast, there is a great emphasis on early detection and diagnosis through the use of screening modalities, such as physical examination, and particularly mammography, which is capable of detecting very small-abnormalities, often nonpalpable. When the physician establishes by means of a mammogram or other screening modality, such as ultrasound, that suspicious circumstances exist, a biopsy must be performed to capture tissue for a definitive diagnosis as to whether the suspicious lesion is cancerous. Biopsy may be done by an open or percutaneous technique. Open biopsy is a surgical procedure using a scalpel and involving direct vision of the target area, for removing the entire mass (excisional biopsy) or a part of the mass (incisional biopsy). Percutaneous biopsy, on the other hand, is usually done with a needle-like instrument through a relatively small incision, blindly or with the aid of an artificial imaging device, and may be either a fine needle aspiration (FNA) or a core biopsy. In FNA biopsy, individual cells or clusters of cells are obtained for cytologic examination and may be prepared such as in a Papanicolaou smear. In core biopsy, as the term suggests, a core or fragment of tissue is obtained for histologic examination which may be done via a frozen section or paraffin section.
The type of biopsy utilized depends in large part on circumstances present with respect to the patient, including the location of the lesion(s) within the body, and no single procedure is ideal for all cases. However, core biopsy is extremely useful in a number of conditions and is being used more frequently by the medical profession.
When an open surgical biopsy procedure is indicated, current practice dictates the use of lesion localization needles and devices, commonly referred to as “localization wires”, for use in localizing or marking non-palpable lesions and tumors within the body. These devices generally comprise a hypodermic needle or cannula which is inserted into the body under local anesthesia to the lesion or tissue of interest. The wire marker, or localization wire, is then passed through the cannula and extends through the lesion of interest so that the distal end thereof is anchored beyond the lesion. Thus, the lesion is marked for subsequent surgical procedures such as excision or biopsy. The anchoring procedure is typically accomplished by means of mechanical structure disposed at the distal end of the wire marker, such as a barb, hook, or the like, which is attached to surrounding tissue. After marking the lesion with the wire marker, the cannula is usually removed from the body, leaving the wire in place and extending from the body, for subsequent use by the surgeon during the biopsy procedure in identifying the lesion location. However, it often occurs that the barb or hook at the distal end of the wire marker attaches to something other than the tumor or lesion. For example, in the case of breast biopsies, the breast will typically be placed in compression during the imaging procedure in order to properly identify the location of the target lesion and place the localization wire. However, breast tissue is comprised of fibrous bands which, in compression, may be close to the target lesion and inadvertently engaged by the barb of the localization wire. Later, when the breast is released from compression prior to the surgical procedure, the fibrous bands will move away from the target lesion, and the distal end of the localization wire may thus move a substantial distance away from the target lesion.
It would be desirable, therefore, to develop a localization wire system and method wherein the distal end of the localization wire could be positively attached to the target lesion in order to minimize the possibility of migration of the distal end of the localization wire away from the target lesion between the imaging and surgical procedures.
In circumstances where a core biopsy procedure is indicated, various systems are available. Such systems are shown, for example, in U.S. Pat. No. 5,526,822 to Burbank et al, which discloses a probe having a laterally disposed tissue receiving port at the distal end thereof for acquiring relatively small tissue samples, and in U.S. Pat. No. 5,111,828 to Kornberg et al., which discloses a probe having an axially disposed tissue receiving port at the distal end thereof for acquiring relatively large intact tissue samples. Both of these patents are expressly incorporated by reference herein.
U.S. application Ser. No. 09/057,303 to Burbank et al., commonly assigned with the present application and expressly incorporated by reference herein, discloses still another core biopsy apparatus, which advantageously permits the acquisition of tissue samples which are larger in diameter than the diameter of the instrument lumen, thereby greatly increasing the chances of completely removing the target lesion and leaving “clean” margins thereabout.
As in the case of localization wires, there is some risk in using any of the foregoing devices that the distal end of the instrument will migrate away from the target lesion during the biopsy procedure, thereby reducing the likelihood of removing target tissue. Heretofore, in the case of core biopsy procedures, the risk of this occurrence is minimized by employing image guidance techniques during the entire tissue removal procedure. For example, in the case of the '822 Burbank et al. patent, a stereotactic imaging guidance system is typically utilized during the disclosed procedure. One disadvantage of this approach, however, is that the patient's breast must remain in compression during the entire procedure, with attendant discomfort and increased procedural difficulty, in order to properly utilize the imaging equipment. Furthermore, stereotactic imaging equipment or other suitable alternatives can cost as much as $400,000 or more and is not in the usual inventory of a typical community hospital. It would therefore be quite advantageous if a method and apparatus could be developed which would permit the uncoupling of the imaging environment from the procedural environment without undue risk that the active or cutting end of the core biopsy instrument would migrate away from the target lesion during the interval between the imaging procedure and the biopsy procedure.
SUMMARY OF THE INVENTIONThe present invention solves the problems outlined above by describing devices and methods for securely affixing a localization wire to desired tissue in a patient's body, so that after the patient is moved from the imaging environment to the procedural environment, the practitioner will have assurance that the localization wire is still accurately placed. Additionally, devices and methods are described for ensuring that the distal end of a tissue acquisition instrument, such as a biopsy instrument, is securely affixed to a particular target area, such as a lesion, in a patient's body, thereby advantageously permitting the imaging environment to be uncoupled from the procedural environment so that expensive and often unavailable imaging equipment, such as stereotactic imaging equipment, need not be used.
More particularly, in one aspect of the invention a medical device is provided comprising a tube having a distal end, a proximal end, and a longitudinal axis, wherein the device is adapted for placement of the distal end thereof into a patient's body at a desired location. The medical device includes a fixation agent, which may comprise any one of a bonding agent, a mechanical fixation agent, or an electrosurgical coagulation element, disposed on the distal end thereof, which is adapted for affixing the distal end of the medical device at the desired location.
The medical device may comprise for example, a localization wire for use in connection with an open biopsy procedure. Alternatively, the device may comprise a tissue acquisition instrument, such as a biopsy instrument. In the preferred embodiment, the fixation agent is a bonding agent, comprising a surgical adhesive, glue, or solvent.
In another aspect of the invention, a tissue acquisition instrument is provided for retrieving body tissue, having a longitudinal axis and which comprises a distal end adapted for entry into a patient's body, a cutting element disposed on the instrument for cutting surrounding tissue, and structure disposed on the distal end for securing the tissue acquisition instrument at a predetermined desired location, in order to ensure that the tissue acquisition instrument remains in place during a tissue acquisition procedure so that desired tissue is properly acquired.
In yet another aspect of the invention, a method of performing a medical procedure is provided, using a medical device comprising a tube having a distal end, a proximal end, and a longitudinal axis. The method first comprises the step of placing the distal end of the tube in a patient's body, so that the distal end is disposed in a desired tissue location. Then, a bonding agent is dispensed for the tube into tissue surrounding the distal end, so that the distal end of the tube becomes affixed to the desired tissue location.
In still another aspect of the invention, a method is provided for performing a tissue acquisition procedure using a tissue acquisition instrument having a distal end, a proximal end, a longitudinal axis, and a cutting element. In this method, the distal end of the instrument is placed into a patient's body, so that the distal end is disposed in a desired tissue location. Then, the distal end of the instrument is affixed to the desired tissue location, so that the instrument does not move relative to the desired tissue location during the tissue acquisition procedure. The cutting element is then actuated to acquire one or more tissue samples.
The invention, together with additional features and advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying illustrative drawing.
BRIEF DESCRIPTION OF THE DRAWING
Referring now more particularly to the drawings,
Once the catheter 12 and introducer needle 14 are in position relative to the target tissue, the introducer needle 14 is removed proximally from the catheter 12, and the localization wire 16 is inserted distally through the entry hole 20 and pushed distally through the lumen in the catheter 12, so that the distal end of the localization wire 16 extends distally of the distal end of the introducer needle and catheter, as shown in
Localization wires such as the wire 16 typically include some-type of mechanical anchoring means, such as a barb or hook 26, for securing the distal end of the localization wire 16 in position behind the target tissue. However, this approach is often inadequate, as discussed supra in the Background portion of the specification, because the tissue to which the hook 26 becomes attached will often shift relative to the target tissue between the imaging step of the medical procedure, which is usually a biopsy, such as a breast biopsy, and the ensuing surgical step, which usually takes place in a different area of the hospital and requires transportation and resultant jostling of the patient from the radiology department to the operating room. The present invention, therefore, contemplates an advantageous additional step of employing a bonding agent, which may comprise any known material which is capable of creating a bond between the distal end of the medical instrument 10 and surrounding tissue. Once the localization wire is properly placed at the desired target tissue site, under imaging guidance, the bonding agent is dispensed from the distal end of the medical instrument to the surrounding tissue to create the desired bond. In the embodiment of
Preferred bonding agents include any known effective biocompatible bonding materials, such as surgical adhesives, including cyanoacrylate, fibrin glue, and solvents.
An alternative to injection of the bonding agent through the lumen of the medical instrument 10 is illustrated in
Once the localization wire is securely bonded to the surrounding tissue, the practitioner may withdraw the catheter and introducer needle assembly, leaving the localization wire in place to mark the target tissue for the ensuing surgical step in the biopsy or other medical procedure.
In operation, the introducer needle 14a is disposed coaxially outside of the catheter 12a, as illustrated in
As in the previous embodiment, once the localization wire is in the proper position, bonding agent is injected into the catheter 12a, preferably using a syringe which is engaged with the stopcock 32a, so that the bonding agent flows distally through the first lumen 38 and is infused through the infusion ports 28a. Again, the infusion ports may be disposed about the catheter, in rows offset by 90 degrees with respect to one another, or otherwise staggered so that the bonding agent is evenly disposed about the catheter. Alternatively, as in the previous embodiment, the bonding agent may be stored in the distal end of the instrument 10a using an apparatus like that illustrated in
Once the bonding agent has been injected, but before it has solidified, the catheter 12a and introducer needle 14a are withdrawn from the patient's body, leaving the localization wire in place.
Still a third embodiment, which functions in a manner equivalent to that of a localization wire is illustrated in
In a manner in some respects similar to the embodiment of
In operation, the instrument 78 is moved axially to a position wherein the distal tip 80 is preferably distal to a target lesion or tissue to be removed, using a suitable imaging technique; In the prior art, such imaging techniques for biopsy procedures and the like typically include the use of a stereotactic or sonographic imaging system, both of which are relatively expensive and not always available in an average community hospital. This approach is designed to combine the imaging and cutting steps so that both occur simultaneously. For example, in the case of a breast biopsy procedure, the breast is clamped in order to effectively utilize the imaging equipment, after which the instrument is inserted into the breast under imaging guidance to the lesion location. Then, under continued imaging guidance, the cutting element is actuated and the target tissue removed.
However, an important advantage of the present invention is the ability to “uncouple” the imaging environment from the procedural environment in a typical surgical or biopsy procedure, and the resultant important ability to utilize unmodified mammography equipment, readily available in most hospitals, to position the distal end of the instrument during the imaging step, rather than expensive and specialized stereotactic equipment. Then, the procedural step may occur later, in another area of the hospital. In the case of breast biopsies, this “uncoupling” also permits the patient's breast to be unclamped for the procedural step, resulting in increased patient comfort and easier working conditions for the practitioner.
These advantages are made possible because the inventive apparatus and technique permits the securement of the distal end of the instrument to the target tissue or lesion with sufficient confidence that the patient may be moved to the procedural environment without fear of having it slip away from the target tissue. This securement is accomplished using a fixation agent, which preferably comprises a bonding agent like that disclosed in connection with the foregoing localization wire and catheter embodiments. In a manner similar to those embodiments, once the instrument is positioned in a desired position, the bonding agent is injected into a lumen of the instrument, or, alternatively, in a manner like that described supra, released from a container or chamber in the distal end of the instrument, so that it may be infused from one or more infusion ports 88 disposed on the distal end of the instrument. Preferably, the ports 88 are disposed on a bushing or sleeve 90 which has a linear slot 92 for permitting passage of the cutting element 86 as it is extended and retracted radially, and which is rotatable relative to the shaft 84. Thus, when the bonding agent is infused to the surrounding tissue, so that the bushing 90 is affixed in place relative to the surrounding tissue, the cutting element 86 will still be rotatable on the underlying shaft 84 in order to permit circumferential cutting of tissue, as desired, during the later procedural step. Suitable care is taken that only a sufficient amount of bonding agent is dispensed to bond the bushing to surrounding tissue, and not the shaft or tip of the instrument, in order that the shaft and tip continue to be rotatable relative to the bushing.
Of course, the bushing 90 may be constructed in number of alternative ways, as will be apparent to those of ordinary skill in the art. For example, as shown in
Rather than using a bonding agent, a mechanical fixation agent may be utilized to secure the distal end of the instrument to surrounding tissue. For example,
In
Any of the foregoing mechanical fixation structures may be interchangeably employed in the embodiments of
Still another means for bonding the distal end of the instrument 78 to surrounding tissue, which is within the scope of the present invention, is to apply RF energy to the tissue, using an electrosurgical coagulation element. The electrosurgical coagulation element may comprise one of the existing electrosurgical elements 82 or 86, or preferably another coagulation element 112 (
This approach may also be utilized in the localization wire embodiments illustrated in
While this invention has been described with respect to various specific examples and embodiments, it is to be understood that the invention is not limited thereto and that it can be variously practiced within the scope of the following claims.
Claims
1. A medical device comprising a tube having a distal end, a proximal end, and a longitudinal axis, the device being adapted for placement of said distal end into a patient's body at a desired location, said medical device having a fixation agent disposed on said distal end, the fixation agent being adapted for affixing the distal end of said medical device at said desired location.
2-48. (canceled)
49. A medical device for securing a medical instrument to a desired location within a patient's body comprising:
- a. a shaft having a distal end, a proximal end, and a longitudinal axis, and having a distal tip configured for advancement within a patient's body to a desired location; and
- b. a fixation agent for fixing the distal end at the desired location which is selected from a group of fixation agents consisting of a bonding agent, an electrical heating agent, an electrosurgical cauterizing agent, and combinations thereof.
50. The medical device as recited in Clam 49, wherein the distal end of the device has at least one opening for dispensing bonding agent into the patient's body to fix the distal end at the desired location.
51. The medical device as recited in claim 50, wherein the bonding agent is a surgical adhesive.
52. The medical device as recited in claim 51, wherein the surgical adhesive is a cyanoacrylate.
53. The medical device as recited in claim 50, wherein the bonding agent is a fibrin glue.
54. The medical device as recited in claim 50, wherein the bonding agent is a solvent.
55. The medical device as recited in claim 50, wherein the tube has a braided outer wall.
56. The device of claim 55 wherein the braided outer wall has an interstice which forms at least in part the at least one opening for dispensing the bonding agent.
57. The medical device as recited in claim 50, wherein the shaft has an outer wall formed at least in part from a coil of material, which has at least one interstice for dispensing the bonding agent.
58. The medical device as recited in claim 50 having a tissue acquisition device with a longitudinal axis about which the medical device is rotatable, a cutting element disposed on the shaft for cutting surrounding tissue, and a bushing disposed on the shaft which has at least one opening and which is rotatable relative to the shaft, and wherein the bonding agent is dispensed through the at least one opening and affixes the bushing to the surrounding tissue, so that the instrument is secured to the desired location without preventing rotational movement thereof.
59. The medical device as recited in claim 49, wherein the fixation agent is an electrosurgical element disposed on the distal end of the shaft, which coagulates tissue surrounding the distal end of the shaft to affix tissue to the distal end of the shaft.
60. The medical device as recited in claim 49, wherein the fixation agent is an electrical heating element disposed on the shaft distal end which cauterizes tissue surrounding the shaft distal end and thereby causes the tissue to be affixed to the distal end of the shaft.
61. The medical device of claim 49, wherein the fixation agent is a, bonding agent selected from the group consisting of adhesives, solvents, and combinations thereof.
62. A medical device for securing medical instruments to a desired location in a patient's body comprising:
- a. a shaft having a distal end configured for advancement within a patient's body to a desired location, a proximal end, a localization wire, and a longitudinal axis;
- b. a fixation agent disposed on the distal end of the shaft which is adapted for affixing the distal end of the medical device at the desired location; and
- c. a catheter having a lumen through which the localization wire is introduced into the patient's body.
63. The medical device as recited in claim 62, wherein the fixation agent is a bonding agent, and the catheter has a second lumen which accommodates the bonding agent.
64. A medical device for securing medical instruments to a desired location in a patient's body comprising:
- a. a shaft having a distal end configured for advancement within a patient's body to a desired location, a proximal end, and a longitudinal axis and
- b. an expandable mechanical fixation agent which is configured for affixing the distal end of the shaft to the desired location.
65. The medical device as recited in claim 64, wherein the mechanical fixation agent is a Mallicot structure.
66. The medical device as recited in claim 64, wherein the mechanical fixation agent is a rolled stent and an axially movable sleeve, and the stent is exposed and unrolls to engage surrounding tissue and affix the distal end of the device when the sleeve is moved proximal to the stent.
67. The medical device as recited in claim 64, wherein the mechanical fixation agent is a radially expandable and retractable basket which is actuatable to extend outwardly into tissue surrounding the distal end of the device to engage the tissue and thereby anchor the distal end of the shaft to the desired location.
68. The medical device as recited-in claim 64, wherein the mechanical fixation agent is a wire.
69. The medical device as recited in claim 64, wherein the mechanical fixation agent is an anchor.
70. A tissue acquisition instrument for retrieving tissue at a body site comprising
- a. a longitudinal axis;
- b. a distal end with a distal tip configured for advancement within a patient's body;
- c. a cutting element having a contracted configuration for delivery to the body site and an expanded configuration for separating tissue from the body site;
- d. a lumen containing a bonding agent and at least one opening disposed at the distal end for dispensing the bonding agent to surrounding tissue; and
- e. a mechanical fixation element disposed proximal to the distal end which has an expanded configuration for securing the tissue acquisition instrument at a predetermined desired location, in order to insure that the tissue acquisition instrument remains in place during a tissue acquisition procedure and which has a fully retracted configuration with a transverse dimension of the bendable legs which is smaller than the expanded configuration.
71. The tissue acquisition instrument as recited in claim 70, wherein the instrument is rotatable about the longitudinal axis and wherein a bushing is disposed on the instrument which is rotatable relative to the instrument and which has an electrical heating element disposed on the bushing which cauterizes and bonds to the bushing when the electrical heating element is energized so that the instrument is secured to a location without preventing rotational movement thereof.
72. The tissue acquisition instrument as recited in claim 70, wherein the instrument is rotatable about the longitudinal axis and wherein the instrument has a bushing disposed on the instrument which is rotatable relative to the instrument and wherein the bonding agent dispensed through the at least one opening affixes the bushing to the surrounding tissue, so that the instrument is secured in a desired location without preventing rotational movement thereof.
73. The tissue acquisition instrument as recited in claim 70, wherein the bonding agent comprises a surgical adhesive.
74. The tissue acquisition instrument as recited in claim 73, wherein the surgical adhesive is a cyanoacrylate.
75. The tissue acquisition instrument as recited in claim 70, wherein the bonding agent is a fibrin glue.
76. The tissue acquisition as recited in claim 70 wherein the bonding agent is a solvent.
77. A tissue acquisition instrument for retrieving tissue at a body site comprising:
- a. a longitudinal axis;
- b. a distal end with a distal tip configured for advancement within a patient's body;
- c. a cutting element which has a contracted configuration for delivery to the body site and an expanded configuration for separating tissue from the body site;
- d. and a mechanical fixation element which is a Mallicot structure, which is disposed proximal to the distal end, which has an expanded configuration for securing the tissue acquisition instrument at a predetermined desired location, in order to insure that the tissue acquisition instrument remains in place during a tissue acquisition procedure and which has a fully retracted configuration with a transverse dimension of the bendable legs which is smaller than the expanded configuration.
78. The tissue acquisition instrument as recited in claim 77, wherein the mechanical fixation agent is a rolled stent and an axially movable sleeve and wherein the stent is exposed and unrolls to engage the surrounding tissue and affix to the distal end of the medical device when the sleeve is moved proximally to the stent.
79. The tissue acquisition instrument as recited in claim 77, wherein the tissue specimen has a transverse dimension and the Mallicot structure is configured to have a transverse dimension smaller than the transverse dimension of the tissue specimen.
80. The tissue acquisition instrument as recited in claim 77, wherein the cutting element has a transverse dimension and the Mallicot structure is configured to have a transverse dimension smaller than the transverse dimension of the cutting element.
81. A tissue acquisition instrument for retrieving a tissue specimen at a body site comprising:
- a. a longitudinal axis;
- b. a distal end with a distal tip configured for advancement within a patient's body;
- c. a cutting element which has a contracted configuration for delivery to the body site and an expanded configuration for separating tissue from the body site and
- d. a mechanical fixation element which is a radially expandable and retractable basket, which is disposed proximal to the distal end, which has an expanded configuration for securing the tissue acquisition instrument at a predetermined desired location, in order to insure that the tissue acquisition instrument remains in place during a tissue acquisition procedure and which has a fully retracted configuration with a transverse dimension which is smaller than the expanded configuration.
82. The tissue acquisition instrument as recited in claim 81, wherein the tissue specimen has a transverse dimension and the radially expandable and retractable basket is configured to have a transverse dimension smaller than the transverse dimension of the tissue specimen.
83. The tissue acquisition instrument as recited in claim 81, wherein the cutting element has a transverse dimension and the radially expandable and retractable basket is configured to have a transverse dimension smaller than the transverse dimension of the cutting element.
84. A tissue acquisition instrument for retrieving tissue at a body site comprising:
- a. a longitudinal axis;
- b. a distal end with a distal tip configured for advancement within a patient's body;
- c. a-cutting element which has a contracted configuration for delivery to the body site and an expanded configuration for separating tissue from the body site;
- d. a mechanical fixation element disposed proximal to the distal end which has an expanded configuration for securing the tissue acquisition instrument at a predetermined desired location, in order to insure that the tissue acquisition instrument remains in place during a tissue acquisition procedure and which has a contracted configuration with a transverse dimension which is smaller than the expanded configuration for delivery to a target site; and
- e. a bushing which is disposed on the instrument, which is rotatable relative to the instrument, and which has an electrosurgical element disposed on the bushing which coagulates and bonds surrounding tissue to the bushing when the electrosurgical element is energized so that the instrument is secured in a desired location without preventing movement thereof.
85. A tissue acquisition instrument for retrieving tissue at a body site comprising:
- a. an elongated shaft having a distal portion, a proximal portion and a longitudinal axis;
- b. a distal end with a distal tip configured for advancement within a patient's body;
- c. a cutting element which has a contracted configuration for delivery to the body site and an expanded configuration for separating tissue from the body site; and
- d. a mechanical fixation element disposed proximal to the distal end which has an expanded configuration for securing the tissue acquisition instrument at a predetermined desired location, in order to insure that the tissue acquisition instrument remains in place during a tissue acquisition procedure, and which has a fully retracted configuration with a transverse dimension which is smaller than the expanded configuration and a hinged linkage configured to have a transverse dimension smaller than a transverse dimension of a tissue specimen.
86. A method for performing a tissue acquisition procedure comprising the steps of:
- a.) providing a tissue acquisition instrument having a distal end, a proximal end, a longitudinal axis, and a cutting element;
- b) placing the distal end of the instrument in a patient's body, so that the distal end is disposed in a desired tissue location and
- c) affixing the distal end of the instrument to the desired tissue location by performing a step selected from the group consisting of dispensing a bonding agent from the distal end into surrounding tissue, activating an electrosurgical element, activating an electrical heating element, and combinations thereof.
87. The method as recited in claim 86, wherein the step of affixing the distal end of the instrument is performed by dispensing a bonding agent from the distal end into surrounding tissue.
88. The method of claim 87, wherein the bonding agent is selected from the group consisting of adhesives, solvents, and combinations thereof.
89. The method as recited in claim 86, wherein the step of affixing the distal end of the instrument is performed by activating an electrosurgical element and operating it to coagulate tissue surrounding the distal end of the instrument, to an extent that the tissue bonds to the instrument distal end.
90. The method as recited in claim 86, wherein the step of affixing the distal end of the instrument is performed by activating an electrical heating element and operating it to cauterize tissue surrounding the distal end of the instrument, to an extent that the tissue bonds to the instrument distal end.
91. A biopsy device for separating a tissue specimen from a target site within a patient, comprising:
- a. an elongated shaft having a distal shaft portion, a proximal shaft portion, a tissue penetrating distal tip and a longitudinal axis;
- b. a radially expandable, longitudinally oriented tissue cutting component which is secured to the distal shaft portion proximal to the distal tip, which has a distal end and a proximal end and which has a contracted configuration for delivery to the target site and an expanded configuration for cutting the tissue specimen from supporting tissue at the target site; and
- c. a tissue fixation component disposed on the elongated shaft between the proximal and distal ends of the tissue cutting component to be fixed to the tissue specimen.
92. The device of claim 91 wherein the tissue fixation component includes a bushing which is disposed on the shaft between the ends of the tissue cutting component, which has at least one discharge opening and which is rotatable relative to the shaft, and wherein a bonding agent is dispensed through the at least one opening to affix the bushing to the tissue specimen.
93. The device of claim 91, wherein the bonding agent is at least in part a surgical adhesive.
94. The device of claim 93 wherein the surgical adhesive is at least in part a cyanoacrylate.
95. The device of claim 91, wherein the bonding agent is at least in part a fibrin glue.
96. The device of claim 91 wherein the bonding agent is at least in part a solvent.
97. The device of claim 91, wherein the tissue fixation component includes a Mallicot structure.
98. The device of claim 91, wherein the tissue fixation component includes an expandable stent.
99. The device of claim. 98 wherein an axially movable sleeve is disposed about the expandable stent, and removal of the sleeve allows the stent to expand and thereby be fixed to the tissue specimen.
100. The device of claim 91, wherein the tissue fixation component includes a radially expandable and retractable basket.
101. The device of claim 91 wherein the tissue fixation component has at least one expandable band.
102. The device of claim 101 wherein the at least one expandable band is split at its center to form a tissue engaging protruding portion.
103. The device of claim 102 wherein the tissue engaging protruding portion extends distally.
104. The device of claim 103 wherein the tissue engaging protruding portion extends proximally.
105. The device of claim 101 wherein the tissue fixation component has a plurality of protruding portions, with at least one protruding portion extending distal and at least one protruding portion extending proximal.
106. The device of claim 105 wherein the protruding portions are part of split bands.
107. The device of claim 91 wherein the penetrating distal tip has an electrosurgical tissue cutting element.
108. The device of claim 107 wherein the electrosurgical tissue cutting element lies in a plane perpendicular to the longitudinal axis of the elongated shaft.
109. The device of claim 107 wherein the electrosurgical tissue cutting element is configured for connection to a RF power source.
Type: Application
Filed: Dec 15, 2005
Publication Date: May 4, 2006
Inventors: Fred Burbank (San Juan Capistrano, CA), Paul Lubock (Laguna Niguel, CA), Michael Jones (Capistrano Beach, CA), Richard Quick (Trabuco Canyon, CA)
Application Number: 11/303,154
International Classification: A61B 10/00 (20060101); A61M 5/178 (20060101);