CA2235702A1 - Stereotactic breast biopsy coil and method for use - Google Patents
Stereotactic breast biopsy coil and method for use Download PDFInfo
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- CA2235702A1 CA2235702A1 CA 2235702 CA2235702A CA2235702A1 CA 2235702 A1 CA2235702 A1 CA 2235702A1 CA 2235702 CA2235702 CA 2235702 CA 2235702 A CA2235702 A CA 2235702A CA 2235702 A1 CA2235702 A1 CA 2235702A1
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Abstract
An MRI breast coil (10) is provided with a large transverse access portal (26) and a stereotactic frame for guiding a biopsy needle (24). The portal is covered by a thin sheath (30) of plastic to retain the breast but still allows insertion of the needle to any location. The frame aligns the needle by azimuth, height, and depth.
Description
CA 0223~702 1998-0~-13 WO97/18751 PCT~S96/18592 4 The present invention relates to MRI-guided tissue biopsy and, in particular, to a stereotaxic breast biopsy coil.
6 Magnetic resonance imaging (MRI) can detect breast 7 malignancies that have previously been sub-clinical (i.e., 8 neither palpable nor detected by mammography). Unfortunately, 9 a 40 percent false positive rate goes along with this detection.
This results in a large number of extremely invasive open 11 biopsies being performed.
12 It iS desirable to use less invasive methods such as a 13 needle biopsy (core or aspiration), but needle placement re~uires 14 1 mm accuracy in three dimensions.
SUMMARY OF THE INVENTION
16 An MRI coil for providing an image of a protuberance of 17 tissue has a tubular wall having a longitudinal proximal portion 18 adapted to receive the protuberance and a longitudinal distal 19 portion. The wall includes a transverse access portal between the distal and proximal portions. This portal eliminates a 21 substantial portion of the wall. A first coil portion is located 22 about the distal portion and a second coil portion is located 23 about the proximal portion.
FIG. 1 is a perspective view of a coil according to the 26 invention from above with a portion exploded.
27 FIG. 2 is a front perspective view of a coil according to 28 t~e invention.
CA 0223~702 l998-0~-l3 WO97/18751 PCT~S96/18592 1 FI&. 3 is a top plan view of the a coil according to the 2 invention.
3 FIG. 4 is front elevation view of a needle guide according 4 to the invention.
FIG. 5 is a graphical view of the geometry of an embodiment 6 of the invention.
8 Referring to FIGS. 1, 2 and 3, a breast biopsy coil lO
9 includes a base 12 to which is attached a tubular wall 14 and three fiducials 16, 18, 20.
11 A ring 22 abuts the external junction of the base 12 and the 12 wall 14. The ring 22 is rotatable about its axis and is slidably 13 retained between the fiducials 16, 18, 20 and base 12 and wall 14 14. A needle guide 24 is removably attached to the ring 22.
These structures can be formed from a suitable non-magnetic, MRI
16 transparent material such as a thermoplastic pol~7mer of methyl 17 methacrylate (e.g., Plexiglas).
18 The wall 14 includes a large aperture or portal 26. The 19 wall 14 contains a slot 28 for receiving a sheath 30. The sheath 30 may be, for example, a thin sheet of plastic of moderate 21 stiffness and being relatively easy to puncture with a sharp 22 instrument (e.g., 15 mil thick polyurethane film such as TEXIN
23 brand polyurethane film from Bayer Polymers Division, Bayer 24 Corporation, or 1/32 inch thick Huntsman ~igh Impact Polystyrene - Medical Grade).
26 The interior of the wall opposite the portal 26 is provided 27 with an inflatable bladder 32. The bladder 32 may be, for 28 example, formed of latex rubber.
29 The coil 10 may have, for example, an internal diameter of 17.8 cm an~ a height of 7 cm. This provides an internal volume 31 of about 1740 ml for ease of breast placement. When the bladder 32 32 is fully inflated, this volume may be, for example, reduced 33 to 9OO ml.
. .
CA 0223~702 l998-0~-l3 1 The proximal portion of the wall 14 contains a portion 34 2 of an electrical coil about its circumference. Similarly, the 3 distal portion of the wall 14 contains a portion 36 of an 4 electrical coil about its circumference. The electrical coil portions 34, 36 may be, for example, single turns. The 6 electrical coil portions are connected by an unshown matching 7 network to a cable 38 and include capacitive splits, a detuning 8 diode, and current traps to protect the coil during transmission 9 by an unshown imager. such features are set forth in U.S. Patent Application Serial Number 08/530,576, filed September 19, 1995, 11 and incorporated herein by reference. The coil may operate, for 12 example, at 63.89 MHz. The distal and proximal coil portions 13 allow for the portal to be, for example, 5.7 cm high and to 14 extend around nearly 180 degrees of the wall 14.
The base 12 can be provided with a graduated scale 38 to 16 provide an azimuthal positioning of the needle guide 24 as the 17 ring 22 is rotated.
18 Referring to FIG. 4, the needle guide 24 has a series of 19 guide bores 40. The bores 40 are in two staggered rows to provide increased spatial resolution. For use with an 18 gauge 21 needle (nominally 1 mm), the bores 40 are bored 0.07 mm over 22 needle size. They are on 2 mm centers with the staggering 23 providing plus or minus 0.5 mm resolution in the vertical 24 direction. A different guide 24 is provided for each size needle to be used. The guide 24 can be conveniently made to insert into 26 a receptacle in the ring 22. The number of staggered rows can 27 be varied to insure the desired resolution for different 28 needle/bore sizes.
29 In general, a needle 42 inserted into the guide 24 will follow a radial path with respect to the ring 22. The 31 graduations scale 38 may be, for example, spaced to provide 1.5 32 mm arc len~th at the interior of the wall 14. This then provides 33 a resolution of plus or minus 0.77 mm at the wall 14 and as the 34 needle tip continues to the center the resolution approaches zero.
CA 0223~702 1998-0~-13 WO97/187S1 PCT~S96/18592 1 The depth of insertion of the needle 42 can be conveniently 2 determined, for example, by either a graduated scale on the 3 needle or a moveable stop placed on the needle to prevent further 4 insertion through a guide bore 40.
The combination of adjusting the ring 22 in azimuth, 6 choosing the proper guide bore 40 and inserting the needle 42 a 7 desired depth into the guide bore can easily provide better than 8 1 mm resolution for positioning the needle tip in three 9 dimensions within the coil lO.
The vertical fiducials 16, 18 consist of 5 mm bores parallel 11 to the axis the coil lO. The fiducials 16, 18 are located on a 12 diameter of the ring 22. The fiducial 20 consists o~ a 5 mm bore 13 at an angle to the fiducial 18. The bores of the fiducials 18, 14 20 intersect to ~orm the zero height reference of the coil lO.
The angle between the fiducials 18, 20 may be, for example, 45 16 degrees. The bores are filled with a material that will provide 17 an MRI image, for example, 0.04M CuSo4-5H2O.
18 In operation, a breast or other protuberance of tissue is 19 inserted into the proximal portion 34 of the wall 14 and extends toward the distal portion 36. In the preferred embodiment, the 21 patient lies in a prone position upon the coil lO (with suitable 22 surrounding support3.
23 The bladder 32 is inflated by unshown means to compress the 24 breast against the portal 26. The sheath 30 keeps the breast from "leaking" in a transverse direction out of the portal 26.
26 The sheath 30 provides support of the lateral portion of breast.
27 Despite the large portal 24, there is no compromise of 28 immobilization. The sheath 30 is readily replaceable between 29 patients or procedures.
The breast is then imaged using the coil lO with an unshown 31 MRI imager. Referring to FIG. 5, in a coronal image, the 32 fiducials ~8, 20 produce dots separated by a distance d. The 33 height h above the base of the coil is given by: h = d-tan(45~).
34 I~ the coordinates of the fiducials 16, 18 are ~x1~ Y1) and tXz~ Y2), respectively, then the midpoint between them (xm/ Ym) is CA 02235702 1998-0~-l3 A l given by: (xm, Ym) = ((x1 + x2)/2, (Y1 ~ y2)/2). The distance 2 between the fiducials 16, 18 is D given by: D = (~x1 - x2)Z + (Y
3 - y2)2)(1/Z) 4 The distance p from the midpoint to the imaged lesion or target (Xt, Yt) is given by: p = ((xt - Xm) 2 + (Yt - y~) 2~ ~1/2), The 6 distance c from the fiducial 16 to the target is given by c =
7 ((xt ~ x2)2 ~ (Yt + Y2)Z)(1/2) The azimuthal angle ~ is given by:
8 ~ = arCcos((c2 _ p2 -(~/2)2)/( 2.p.(D/2)) 9 The needle insertion length N i5 given by: N = R - p where R is the length of the needle. Thus the image can be used to ll provide the anteroposterior distance, the needle insertion 12 length, and the angular position necessary to locate the target 13 in three dimensions and insert the tip the needle 42 to that 14 location.
Based on the data from the image, the needle guide 24 is l~ rotated to the correct azimuth and the needle inserted into the 17 correct guide bore 40. The needle 42 is then inserted through 18 the sheath 30 into the breast (the needle and sheath are sterile) l9 to the desired depth. For particularly large bore needles, the breast skin (and the sheath) can be nicked to assist in inserting 2l the needle. The tip of the needle is then located within less 22 than l mm of the desired location.
23 A biopsy of the lesion can be performed by using either a 24 coring biopsy needle or an aspiration biopsy needle. In addition, because of MRI detects tumor borders more accurately 26 than other modalities, the needle can be used to localize the 27 lesion.
28 The large po!rtal 24 provides ready access to any point 29 within the breast and makes such procedures as skin nicks easy to accomplish. This large portal 24 is made possible by the 3l sheath 30.
32 The s~eath 30 provides support and immobilization for the 33 tissue, while still permitting access to any location of the 34 tissue with needles or other puncturing or cutting instruments.
This combination of portal and sheath can be used in other CA 0223~702 1998-0~-13 WO97/18751 PCT~S96/18592 l coil/frame structures, for example, a tubular wall having an oval 2 or rectangular cross-section, or a frustoconical chamber can be 3 conveniently provided with a large portal that can be covered 4 with a sheath.
In the preferred embodiment, the necessary position settings 6 for the needle 42 are automatically calculated by either software 7 in the imager or in an auxiliary computer such as a laptop 8 computer.
9 The coil lO as described provides needle access to within about l cm of the chest wall. If access to the blocked area is ll desired, the needle guide 24 can be provided with guide bores at 12 a polar angle to the plane o~ the coil. With minor modifications 13 to the calculations, the needle can then be accurately inserted 14 into this area.
Other configurations of the invention are also possible, for 16 example, the electrical coil portions 34, 36 can be provided in 17 the form of a separate electrical coil or coils that are placed 18 about the coil lO during operation. The coil lO is then more l9 accurately described as a frame even though its structure remains otherwise unchanged. This structure provides a stereotactic 21 frame for orienting a needle. It also may be advantageous to use 22 the coil lO in combination with additional electrical coil 23 geometries (e.g.,. Helmoltz, saddle, or surface coil), either 24 integral or external.
It should be evident that this disclosure is by way of 26 example and that various changes may be made by adding, modifying 27 or eliminating details without departing from the fair scope of 28 the teaching contained in this disclosure. The invention is 29 therefore not limited to particular details of this disclosure except to the extent that the following claims are necessarily 3l so limited.
.
6 Magnetic resonance imaging (MRI) can detect breast 7 malignancies that have previously been sub-clinical (i.e., 8 neither palpable nor detected by mammography). Unfortunately, 9 a 40 percent false positive rate goes along with this detection.
This results in a large number of extremely invasive open 11 biopsies being performed.
12 It iS desirable to use less invasive methods such as a 13 needle biopsy (core or aspiration), but needle placement re~uires 14 1 mm accuracy in three dimensions.
SUMMARY OF THE INVENTION
16 An MRI coil for providing an image of a protuberance of 17 tissue has a tubular wall having a longitudinal proximal portion 18 adapted to receive the protuberance and a longitudinal distal 19 portion. The wall includes a transverse access portal between the distal and proximal portions. This portal eliminates a 21 substantial portion of the wall. A first coil portion is located 22 about the distal portion and a second coil portion is located 23 about the proximal portion.
FIG. 1 is a perspective view of a coil according to the 26 invention from above with a portion exploded.
27 FIG. 2 is a front perspective view of a coil according to 28 t~e invention.
CA 0223~702 l998-0~-l3 WO97/18751 PCT~S96/18592 1 FI&. 3 is a top plan view of the a coil according to the 2 invention.
3 FIG. 4 is front elevation view of a needle guide according 4 to the invention.
FIG. 5 is a graphical view of the geometry of an embodiment 6 of the invention.
8 Referring to FIGS. 1, 2 and 3, a breast biopsy coil lO
9 includes a base 12 to which is attached a tubular wall 14 and three fiducials 16, 18, 20.
11 A ring 22 abuts the external junction of the base 12 and the 12 wall 14. The ring 22 is rotatable about its axis and is slidably 13 retained between the fiducials 16, 18, 20 and base 12 and wall 14 14. A needle guide 24 is removably attached to the ring 22.
These structures can be formed from a suitable non-magnetic, MRI
16 transparent material such as a thermoplastic pol~7mer of methyl 17 methacrylate (e.g., Plexiglas).
18 The wall 14 includes a large aperture or portal 26. The 19 wall 14 contains a slot 28 for receiving a sheath 30. The sheath 30 may be, for example, a thin sheet of plastic of moderate 21 stiffness and being relatively easy to puncture with a sharp 22 instrument (e.g., 15 mil thick polyurethane film such as TEXIN
23 brand polyurethane film from Bayer Polymers Division, Bayer 24 Corporation, or 1/32 inch thick Huntsman ~igh Impact Polystyrene - Medical Grade).
26 The interior of the wall opposite the portal 26 is provided 27 with an inflatable bladder 32. The bladder 32 may be, for 28 example, formed of latex rubber.
29 The coil 10 may have, for example, an internal diameter of 17.8 cm an~ a height of 7 cm. This provides an internal volume 31 of about 1740 ml for ease of breast placement. When the bladder 32 32 is fully inflated, this volume may be, for example, reduced 33 to 9OO ml.
. .
CA 0223~702 l998-0~-l3 1 The proximal portion of the wall 14 contains a portion 34 2 of an electrical coil about its circumference. Similarly, the 3 distal portion of the wall 14 contains a portion 36 of an 4 electrical coil about its circumference. The electrical coil portions 34, 36 may be, for example, single turns. The 6 electrical coil portions are connected by an unshown matching 7 network to a cable 38 and include capacitive splits, a detuning 8 diode, and current traps to protect the coil during transmission 9 by an unshown imager. such features are set forth in U.S. Patent Application Serial Number 08/530,576, filed September 19, 1995, 11 and incorporated herein by reference. The coil may operate, for 12 example, at 63.89 MHz. The distal and proximal coil portions 13 allow for the portal to be, for example, 5.7 cm high and to 14 extend around nearly 180 degrees of the wall 14.
The base 12 can be provided with a graduated scale 38 to 16 provide an azimuthal positioning of the needle guide 24 as the 17 ring 22 is rotated.
18 Referring to FIG. 4, the needle guide 24 has a series of 19 guide bores 40. The bores 40 are in two staggered rows to provide increased spatial resolution. For use with an 18 gauge 21 needle (nominally 1 mm), the bores 40 are bored 0.07 mm over 22 needle size. They are on 2 mm centers with the staggering 23 providing plus or minus 0.5 mm resolution in the vertical 24 direction. A different guide 24 is provided for each size needle to be used. The guide 24 can be conveniently made to insert into 26 a receptacle in the ring 22. The number of staggered rows can 27 be varied to insure the desired resolution for different 28 needle/bore sizes.
29 In general, a needle 42 inserted into the guide 24 will follow a radial path with respect to the ring 22. The 31 graduations scale 38 may be, for example, spaced to provide 1.5 32 mm arc len~th at the interior of the wall 14. This then provides 33 a resolution of plus or minus 0.77 mm at the wall 14 and as the 34 needle tip continues to the center the resolution approaches zero.
CA 0223~702 1998-0~-13 WO97/187S1 PCT~S96/18592 1 The depth of insertion of the needle 42 can be conveniently 2 determined, for example, by either a graduated scale on the 3 needle or a moveable stop placed on the needle to prevent further 4 insertion through a guide bore 40.
The combination of adjusting the ring 22 in azimuth, 6 choosing the proper guide bore 40 and inserting the needle 42 a 7 desired depth into the guide bore can easily provide better than 8 1 mm resolution for positioning the needle tip in three 9 dimensions within the coil lO.
The vertical fiducials 16, 18 consist of 5 mm bores parallel 11 to the axis the coil lO. The fiducials 16, 18 are located on a 12 diameter of the ring 22. The fiducial 20 consists o~ a 5 mm bore 13 at an angle to the fiducial 18. The bores of the fiducials 18, 14 20 intersect to ~orm the zero height reference of the coil lO.
The angle between the fiducials 18, 20 may be, for example, 45 16 degrees. The bores are filled with a material that will provide 17 an MRI image, for example, 0.04M CuSo4-5H2O.
18 In operation, a breast or other protuberance of tissue is 19 inserted into the proximal portion 34 of the wall 14 and extends toward the distal portion 36. In the preferred embodiment, the 21 patient lies in a prone position upon the coil lO (with suitable 22 surrounding support3.
23 The bladder 32 is inflated by unshown means to compress the 24 breast against the portal 26. The sheath 30 keeps the breast from "leaking" in a transverse direction out of the portal 26.
26 The sheath 30 provides support of the lateral portion of breast.
27 Despite the large portal 24, there is no compromise of 28 immobilization. The sheath 30 is readily replaceable between 29 patients or procedures.
The breast is then imaged using the coil lO with an unshown 31 MRI imager. Referring to FIG. 5, in a coronal image, the 32 fiducials ~8, 20 produce dots separated by a distance d. The 33 height h above the base of the coil is given by: h = d-tan(45~).
34 I~ the coordinates of the fiducials 16, 18 are ~x1~ Y1) and tXz~ Y2), respectively, then the midpoint between them (xm/ Ym) is CA 02235702 1998-0~-l3 A l given by: (xm, Ym) = ((x1 + x2)/2, (Y1 ~ y2)/2). The distance 2 between the fiducials 16, 18 is D given by: D = (~x1 - x2)Z + (Y
3 - y2)2)(1/Z) 4 The distance p from the midpoint to the imaged lesion or target (Xt, Yt) is given by: p = ((xt - Xm) 2 + (Yt - y~) 2~ ~1/2), The 6 distance c from the fiducial 16 to the target is given by c =
7 ((xt ~ x2)2 ~ (Yt + Y2)Z)(1/2) The azimuthal angle ~ is given by:
8 ~ = arCcos((c2 _ p2 -(~/2)2)/( 2.p.(D/2)) 9 The needle insertion length N i5 given by: N = R - p where R is the length of the needle. Thus the image can be used to ll provide the anteroposterior distance, the needle insertion 12 length, and the angular position necessary to locate the target 13 in three dimensions and insert the tip the needle 42 to that 14 location.
Based on the data from the image, the needle guide 24 is l~ rotated to the correct azimuth and the needle inserted into the 17 correct guide bore 40. The needle 42 is then inserted through 18 the sheath 30 into the breast (the needle and sheath are sterile) l9 to the desired depth. For particularly large bore needles, the breast skin (and the sheath) can be nicked to assist in inserting 2l the needle. The tip of the needle is then located within less 22 than l mm of the desired location.
23 A biopsy of the lesion can be performed by using either a 24 coring biopsy needle or an aspiration biopsy needle. In addition, because of MRI detects tumor borders more accurately 26 than other modalities, the needle can be used to localize the 27 lesion.
28 The large po!rtal 24 provides ready access to any point 29 within the breast and makes such procedures as skin nicks easy to accomplish. This large portal 24 is made possible by the 3l sheath 30.
32 The s~eath 30 provides support and immobilization for the 33 tissue, while still permitting access to any location of the 34 tissue with needles or other puncturing or cutting instruments.
This combination of portal and sheath can be used in other CA 0223~702 1998-0~-13 WO97/18751 PCT~S96/18592 l coil/frame structures, for example, a tubular wall having an oval 2 or rectangular cross-section, or a frustoconical chamber can be 3 conveniently provided with a large portal that can be covered 4 with a sheath.
In the preferred embodiment, the necessary position settings 6 for the needle 42 are automatically calculated by either software 7 in the imager or in an auxiliary computer such as a laptop 8 computer.
9 The coil lO as described provides needle access to within about l cm of the chest wall. If access to the blocked area is ll desired, the needle guide 24 can be provided with guide bores at 12 a polar angle to the plane o~ the coil. With minor modifications 13 to the calculations, the needle can then be accurately inserted 14 into this area.
Other configurations of the invention are also possible, for 16 example, the electrical coil portions 34, 36 can be provided in 17 the form of a separate electrical coil or coils that are placed 18 about the coil lO during operation. The coil lO is then more l9 accurately described as a frame even though its structure remains otherwise unchanged. This structure provides a stereotactic 21 frame for orienting a needle. It also may be advantageous to use 22 the coil lO in combination with additional electrical coil 23 geometries (e.g.,. Helmoltz, saddle, or surface coil), either 24 integral or external.
It should be evident that this disclosure is by way of 26 example and that various changes may be made by adding, modifying 27 or eliminating details without departing from the fair scope of 28 the teaching contained in this disclosure. The invention is 29 therefore not limited to particular details of this disclosure except to the extent that the following claims are necessarily 3l so limited.
.
Claims (20)
1. An MRI coil for providing an image of a protuberance of tissue, said coil comprising:
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
a first coil portion about said distal portion; and a second coil portion about said proximal portion.
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
a first coil portion about said distal portion; and a second coil portion about said proximal portion.
2. A coil according to claim 1, further comprising a fiducial reference providing a correspondence between said image and the interior of said tubular wall.
3. A coil according to claim 1, further comprising a puncturable sheath closing said portal, said sheath being readily replaceable.
4. A coil according to claim 1, further comprising a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal.
5. A coil according to claim 1, further comprising a member constrained to move azimuthally about an axis extending longitudinally within said wall; and a needle guide connected to said member, said guide including a plurality of guide bores for locating a needle in a plurality of longitudinal positions between said proximal and distal portions.
6. A coil according to claim 5, further comprising a puncturable sheath closing said portal, said sheath being readily replaceable.
7. A coil according to claim 6, further comprising a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal.
8. A stereotactic frame for orientating a needle, said frame comprising:
a base;
a member constrained to move azimuthally about an axis extending transversely from said base;
a needle guide connected to said member, said guide including a plurality of guide bores for locating said needle in a plurality of positions spaced away from said base.
a base;
a member constrained to move azimuthally about an axis extending transversely from said base;
a needle guide connected to said member, said guide including a plurality of guide bores for locating said needle in a plurality of positions spaced away from said base.
9. A frame according to claim 8, further comprising a fiducial reference providing a correspondence between an MRI
image and said frame.
image and said frame.
10. A frame according to claim 8, wherein guides having different sizes of guide bores are interchangeably connectable to said member.
11. A frame according to claim 8, further comprising:
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall being attached to said base and including a transverse access portal between said distal and proximal portions; and a puncturable sheath closing said portal, said sheath being readily replaceable.
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall being attached to said base and including a transverse access portal between said distal and proximal portions; and a puncturable sheath closing said portal, said sheath being readily replaceable.
12. A frame according to claim 11, further comprising a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal.
13. A frame for immobilizing a protuberance of tissue, said frame comprising:
at least one wall having a longitudinal proximal portion closest to said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
and a puncturable sheath closing said portal, said sheath being readily replaceable.
at least one wall having a longitudinal proximal portion closest to said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
and a puncturable sheath closing said portal, said sheath being readily replaceable.
14. A frame for immobilizing a protuberance of tissue, said frame comprising:
a wall having a longitudinal proximal portion adapted to receive and engirdle said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall; and a puncturable sheath closing said portal, said sheath being readily replaceable.
a wall having a longitudinal proximal portion adapted to receive and engirdle said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall; and a puncturable sheath closing said portal, said sheath being readily replaceable.
15. A frame according to claim 14, further comprising a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal.
16. A frame according to claim 14, further comprising a fiducial reference providing a correspondence between an MRI
image and the interior of said wall.
image and the interior of said wall.
17. A frame for immobilizing a protuberance of tissue, said frame comprising:
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions; and a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal.
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions; and a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal.
18. An MRI coil for providing an image of a protuberance of tissue, said coil comprising:
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
a first coil portion about said distal portion;
a second coil portion about said proximal portion;
a fiducial reference providing a correspondence between said image and the interior of said tubular wall;
a puncturable sheath closing said portal, said sheath being readily replaceable;
a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal;
a member constrained to move azimuthally about an axis extending longitudinally within said wall; and a needle guide connected to said member, said guide including a plurality of guide bores for locating a needle in a plurality of longitudinal positions between said proximal and distal portions.
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
a first coil portion about said distal portion;
a second coil portion about said proximal portion;
a fiducial reference providing a correspondence between said image and the interior of said tubular wall;
a puncturable sheath closing said portal, said sheath being readily replaceable;
a bladder inside said wall, said bladder being inflatable to urge said protuberance toward said portal;
a member constrained to move azimuthally about an axis extending longitudinally within said wall; and a needle guide connected to said member, said guide including a plurality of guide bores for locating a needle in a plurality of longitudinal positions between said proximal and distal portions.
19. A method for maneuvering a needle to a location indicated in an MRI image of a protuberance of tissue, said method comprising:
providing an MRI coil for providing said image;
providing a stereotactic frame, said frame including:
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
a fiducial reference providing a correspondence between said image and the interior of said tubular wall;
a puncturable sheath closing said portal, said sheath being readily replaceable;
a member constrained to move azimuthally about an axis extending longitudinally within said wall; and a needle guide connected to said member, said guide including a plurality of guide bores for locating a needle in a plurality of longitudinal positions between said proximal and distal portions;
inserting said protuberance into said proximal portion;
imaging said protuberance and said fiducial reference;
determining the correspondence between said location and the interior of said tubular wall;
moving said needle guide to an azimuth intersecting said location;
placing said, needle into a guide bore intersecting said location; and inserting said needle through said sheath to a depth intersecting said location.
providing an MRI coil for providing said image;
providing a stereotactic frame, said frame including:
a tubular wall having a longitudinal proximal portion adapted to receive said protuberance and a longitudinal distal portion, said wall including a transverse access portal between said distal and proximal portions, said portal eliminating a substantial portion of said wall;
a fiducial reference providing a correspondence between said image and the interior of said tubular wall;
a puncturable sheath closing said portal, said sheath being readily replaceable;
a member constrained to move azimuthally about an axis extending longitudinally within said wall; and a needle guide connected to said member, said guide including a plurality of guide bores for locating a needle in a plurality of longitudinal positions between said proximal and distal portions;
inserting said protuberance into said proximal portion;
imaging said protuberance and said fiducial reference;
determining the correspondence between said location and the interior of said tubular wall;
moving said needle guide to an azimuth intersecting said location;
placing said, needle into a guide bore intersecting said location; and inserting said needle through said sheath to a depth intersecting said location.
20. A method according to claim 19, further comprising:
further including in said frame a bladder inside said wall and;
inflating said bladder to urge said protuberance toward said portal.
further including in said frame a bladder inside said wall and;
inflating said bladder to urge said protuberance toward said portal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/562,564 | 1995-11-24 | ||
| US08/562,564 US5706812A (en) | 1995-11-24 | 1995-11-24 | Stereotactic MRI breast biopsy coil and method for use |
| PCT/US1996/018592 WO1997018751A1 (en) | 1995-11-24 | 1996-11-20 | Stereotactic breast biopsy coil and method for use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2235702A1 true CA2235702A1 (en) | 1997-05-29 |
Family
ID=29406096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2235702 Abandoned CA2235702A1 (en) | 1995-11-24 | 1996-11-20 | Stereotactic breast biopsy coil and method for use |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2235702A1 (en) |
-
1996
- 1996-11-20 CA CA 2235702 patent/CA2235702A1/en not_active Abandoned
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |