US 20070010738 A1
A site marker delivery system is provided that may be used in combination with a tissue cutting device for marking a biopsy site. The system includes a tube attached to a hub. A push-rod is slidably disposed within the lumen of the tube. The push-rod is advanced forward through the lumen of the tube causing a marker seated within the tube to be deployed at a biopsy site.
32. A marker delivery system comprising:
a hub having a proximal end and a distal end and a channel extending between said ends;
a tube having a lumen, a proximal end and a distal end, said proximal end of said tube being attachable to said hub, said tube having an aperture in communication with said lumen;
a tube guide operatively connected to said tube, said tube guide having proximal and distal ends and a channel extending between said ends; and
a push-rod dimensioned to slidably pass through said channels of said hub and tube guide, and said lumen of said tube to said distal end of said tube, said push-rod being selectively operable to advance a marker seated in said lumen of said tube out of said lumen through said aperture.
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This application claims the benefit of U.S. Provisional Application Ser. No. 60/618,868 filed Oct. 14, 2004 which is hereby incorporated by reference in its entirety.
The invention generally relates to a biopsy site marker delivery system that may be used with a biopsy tissue cutting device. More particularly, the invention relates to a biopsy site marker delivery system for non-surgically implanting a site marker at a biopsy.
In the field of breast cancer, stereotactically guided and percutaneous biopsy procedures have increased in frequency as well as in accuracy as modern imaging techniques allow the physician to locate lesions with ever increasing precision. However, for a given biopsy procedure, a subsequent examination of the biopsy site is very often desirable.
For example, in those cases where the lesion is found to be benign, a follow-up examination of the biopsy site may be conducted at a later time. Where the lesion is found to be malignant, the physician may want to place additional site markers to help guide the surgeon to the malignancy.
A number of procedures and devices for marking and locating particular tissue locations are known in the prior art. For example, location wire guides are well known for locating lesions, particularly in the breast. One such known device includes a tubular introducer needle and an attached wire guide, which has at its distal end, a helical coil configuration for locking into position about the targeted lesion. The needle is introduced into the breast and guided to the lesion site using an imaging system of a known type, for example, X-Ray, ultrasound or magnetic resonance imaging (MRI), at which time the helical coil at the distant end is deployed about the lesion. Then, the needle may be removed from the wire guide, which remains locked in position distally about the lesion for guiding a surgeon down the wire to the lesion site during subsequent surgery. While such a location system is effective, it is obviously intended and designed to be only temporary, and is removed once the surgery or other procedure has been completed.
It is also known to employ biocompatible dyes or stains to mark breast lesions. First, a syringe containing the colorant is guided to the detection lesion, using an imaging system. Later, during the extraction procedure, the surgeon harvests a tissue sample from the stained tissue. However, while such staining techniques can be effective, it is difficult to precisely localize the stain. Also, the stains are difficult to detect fluoroscopically and may not always be permanent.
Additionally, it is known to implant markers directly into a patient's body using an invasive surgical technique. This enables a practitioner to later return to the site of the graft by identifying the rings, for evaluation purposes.
Each of the above systems and methods for marking a biopsy site has disadvantages associated with effectiveness, accuracy, and invasive surgical techniques. Accordingly, what is needed is a site marker delivery system for delivering a marker to a biopsy site, and deploying the marker at the site effectively, accurately, and without the need for additional invasive surgical procedures.
In one embodiment of the present invention, the marker delivery system further includes a hub having a proximal end, a distal end and a channel extending between these ends. A tube having a lumen, a proximal end and a distal end, is attachable to the hub proximate the distal end thereof. The tube includes an aperture in communication with the lumen. The aperture is formed through a portion of a side wall of the tube proximate the distal end thereof.
A push-rod is dimensioned to be slidably passed through the channel of the hub and the lumen of the tube to the distal end thereof. The push-rod is operative to advance a marker seated in the lumen of the tube and out of the lumen through the aperture formed in the side wall of the tube.
A tube guide may be provided that is selectively attachable to a non-working end of a tissue cutting device to facilitate the proper alignment of the tube with a channel of the tissue cutting device. The tube guide includes proximal and distal ends and is formed with a channel extending between these ends.
An embodiment of a site marker delivery system 10 that may be used in combination with a tissue cutting device for efficiently, accurately and sanitarily depositing a marker at a biopsy site, is disclosed. The marker delivery system 10 includes advantages over conventional delivery devices which are sometimes difficult to use, often result in inaccurate placement of the marker within the biopsy cavity, and allow for relatively large volumes of biological fluids to spill out from the biopsy device onto other equipment, medical professionals, the surrounding work area and floor.
The site marker delivery system 10 is formed of medical grade materials, for example, stainless steel, plastic and rubber. The site marker delivery system 10 includes universal features that allows the system to be used with a number of tissue cutting devices of different sizes, particularly with regard to an inner diameter of an inner cannula and the length of the cutting element of a particular tissue cutting device. The system 10 is adaptable for use in conventional biopsy procedures which may be performed manually and stereo-tactically. Other advantages provided by the site marker delivery system 10 over conventional marker delivery devices will become apparent from reading the following.
In one embodiment, the hub 12 includes a tactile indicator 40 adjacent the proximal end 14 that is indicative of the circumferential orientation of an aperture 24 of a tube 18 to be described hereinafter. The tactile indicator 40 may include a marking 64 that allows the indicator 40 to be visible in low light conditions as an additional means of indicating the orientation of the aperture 24 of the tube 18.
A tube 18 having a lumen (not shown) is provided having a proximal end 20 and distal end 22. The tube 18 is fixedly attachable to the hub 12 adjacent the distal end 16 of the hub 12. As mentioned above, the tube 18 includes an aperture 24 that is in communication with the lumen. The aperture 24 is formed through a portion of a side-wall of the tube 18 proximate the distal end 22. In one embodiment, the tube 18 is dimensioned to slidably pass through a channel C of a tissue cutting device (See
The tube 18 is preferably formed of a substantially rigid medical grade material such as stainless steel, plastic or other materials suitable. A marker (M) may be seated within the tube 18. It is preferred that the marker M is seated adjacent a proximal end of the aperture 24 (See
In one embodiment, the tube may further include an inclined wall 42 formed proximate a distal end 43 of the aperture 24 (See
c. Tube Guide
A tube guide 26 may be provided. The tube guide 26 is selectively attachable to a non-working end of a tissue cutting device. The tube guide 26 includes a proximal end 28 and a distal end 30. The tube guide 26 is formed with a channel 32 that extends between the proximal 28 and distal 30 ends (See
Preferably, the tube guide 26 includes at least one attachment pin 36 disposed on an exterior wall thereof. The attachment pin 36 is constructed for engaging a complimentary mounting groove 38 formed on the non-working end of the tissue cutting device so as to key the tube guide to the tissue cutting device. After the tube guide 26 is keyed to the tissue cutting device, the channel 32 of the tube guide 26 is longitudinally aligned with the channel C of the tissue cutting device. Accordingly, tube guide 26 operates to maintain the orientation between the marker delivery system 10 and the tissue cutting device.
As best illustrated in
As shown in
The tube guide 26 may also include an air venting aperture 50 that has an inner diameter less than an inner diameter of the channel 32 of the tube guide 26. The disparate diameters insures that the tube 18 cannot be erroneously fitted into the air venting aperture 50 causing it to be out of alignment with the channel C of the tissue cutting device.
A push-rod 34 is dimensioned to slidably pass through the channel 15 of the hub 12 and the lumen of the tube 18 to the distal end 22 of the tube 18. The push-rod 34 is operable to advance the marker M seated in the lumen of the tube 18 out of the lumen through the aperture 24. In one embodiment, the push-rod 34 has an outer diameter that is substantially contiguous with the lumen of the tube 18. In this fashion, the push-rod 34 operates to close or block the aperture 24 such that after the marker M has been deployed it can not fall back into the aperture 24.
e. Deployment Trigger
The site marker delivery system 10 preferably also includes a deployment trigger 44 that is selectively attachable to the proximal end 14 of the hub 12. As seen in
Preferably, the deployment trigger 44 is formed as a push plate having opposing surfaces and at least one retaining arm 52 extending from the first surface 54. The at least one retaining arm 52 operates to engage a complimentary retaining rim 56 (best seen in
As best illustrated in
f. Method of Using the Marker Delivery System
At 110, the method continues by sliding the tube 18 through the channel 32 of the tube guide 26 and the channel C of the tissue cutting device toward the distal end of the tissue cutting device.
At 120, the user of the site marker delivery system 10 receives a tactile indication from contacting the distal end of the tissue cutting device with the distal end 22 of the tube 18. This indicates that the marker delivery system 10 is in position for deployment of the site marker.
At 130, the method continues by aligning the aperture 24 of the tube 18 with an aperture formed proximate the distal end of the tissue cutting device. The tactile indicator 40 assists the user in orientating the aperture 24 with the aperture in the tissue cutting device. The method advances to 140.
At 140, the biopsy site is marked by depositing a marker seated in the lumen of the tube 18 at the biopsy site. This is accomplished by advancing the push-rod 34 through the channel 15 of the hub 12 and the lumen of the tube 18 toward the distal end 22 of the tube 18 until the marker M is discharged from the lumen and out through the aperture 24. If a retention tab 41 is provided, this step may also pushing retention tab 41 upwardly such that marker M may be advanced to the aperture 24 by push-rod 34.
At 150, the push-rod is locked in place after the marker M has been discharged from the lumen through the aperture 24 by engaging the deployment trigger 44 onto the proximal end 14 of the hub 12. In this fashion, the push rod 34 operates to prevent the marker from falling back into the aperture 24 during removal of the side marker delivery system 10 and the tissue cutting device from the biopsy site.
Referring now to
In one embodiment, positioned slightly inboard of distal end 210 is at least one holding tab 214. Holding tab 214 is formed on an internal surface of cannula 202 and is sized so as to frictionally engage a portion of a site marker 216 (to be explained in further detail below). In one embodiment holding tab 214 is constructed of a suitable material having a predetermined degree of flexibility such that a predetermined amount of force may flex the holding tab out of engagement with site marker 216.
Push rod 204 is connected to a deployment plunger 218 at its proximal end. Push rod 204 further includes a distal end 220 that is selectively contactable with site marker 216. Push rod 204 is dimensioned to slidaby pass through the lumen of cannula 202 to the distal end 210 of cannula 202. However, push rod 204 further may be dimensioned so as to be substantially contiguous with the lumen of cannula 202 to block or close open distal end 210 such that after marker 216 has been deployed, it cannot reenter cannula 202.
Deployment plunger 218 is formed as a push plate having opposing surfaces 222, 224 and at least one retaining arm 226 extending from one of the opposing surfaces 222. Retaining arm 226 operates to engage retaining rim 212 of cannula 202 in a complementary fashion. Engagement of retaining arm 226 and retaining rim 212 operates to lock push rod 204 in place after marker 216 has been advanced out though distal end 210. The engagement of retaining arm 226 and 212 provides a tactile (force feedback from snapping retaining arm 226 onto retaining rim 212) and audible (the “snapping” sound generated when retaining arm 226 engages retaining rim 212) indication to the user of site marker delivery system 200 that marker 216 has been deployed.
Handle 206 is connected to cannula 202. In one embodiment, handle 206 is integrally formed with cannula 202. Handle 206 provides a convenient gripping portion for grasping cannula 202 to maintain the position of cannula 202 while activating the deployment plunger 218.
Marker 216 is positioned within open distal end 210 of cannula. In one embodiment, marker 216 includes a head portion 228 and a body portion 230, where head portion 228 is sized to be at least slightly larger than the outside diameter of cannula 202 such that head portion 228 remains outside of the lumen of cannula 202. While head portion 228 is configured as a “cap” in
Body portion 230 is sized to at least partially slidably pass into distal end 210 of cannula 202. However, body portion 230 is also sized such that it frictionally engages holding tab 214. Holding tab 214 retains marker 216 to cannula 202 until it is deployed via push rod 204.
When deployment plunger 218 is activated, push rod 204 moves through cannula 202 until distal end 220 of push rod 204 comes into contact with an end 232 of body portion 230. Push rod 204 then over comes the frictional force of holding tab 214 and pushes marker 216 out through distal end 210 of cannula 202 into the body cavity. When deployment plunger 218 has reached distal end 210 of cannula 202, retaining arm 226 engages retaining rim 212 thereby indicating deployment of marker 216.
The foregoing embodiments of the site marker delivery system is disclosed for illustrative purposes. Many adaptations and modifications will become apparent to one of ordinary skill in the art upon reading the above descriptions. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalence to which such claims are entitled.