Tissue acquisition device with indication system
View Patent ↗Among other things, there is disclosed a biopsy needle system in which the needle is capable of obtaining more than one length of sample. Generally, the needle includes an inner stylet, an outer cannula, and a handle connected to the stylet and cannula. The stylet has a notch that is extendable from the cannula to accommodate a tissue sample. An insert member is provided for attachment to the handle to make the amount of exposed notch smaller. Consequently, when the insert member is not attached to the handle, the needle can obtain a larger sample of tissue, and when the insert member is attached to the handle, the needle can obtain a smaller sample of tissue.
1. A tissue sample acquisition device, comprising:
a handle, the handle having a surface with first and second openings and an actuator that moves linearly proximally and distally with respect to the surface;
a sampling portion having an elongated cannula at least partially extending from the handle connected to a slide member adapted to slide with respect to the surface, the sampling portion having at least one visually contrasting portion, the at least one visually contrasting portion having an immediately observable visual contrast with one or more adjacent parts of the handle;
wherein at least part of the sampling portion and the handle are movable with respect to each other between at least a first relative configuration and a second relative configuration, the first relative configuration corresponding to a first armed state operationally adapted to result in obtaining a first sample size, and the second relative configuration corresponding to a second armed state operationally adapted to result in obtaining a second sample size different from the first sample size, and wherein when the sampling portion and handle are in the first relative configuration, at least part of the at least one visually contrasting portion is visible through the first opening, and when the sampling portion and handle are in the second relative configuration, at least part of the at least one visually contrasting portion is visible through the second opening,
wherein pulling the actuator linearly with respect to the handle surface a first distance from a rest position produces the first relative configuration, and pulling the actuator linearly with respect to the handle surface a second distance from a rest position produces the second relative configuration.
2. The device of claim 1 , wherein in the first relative configuration, a different view is visible through the second opening, the different view comprising one of (a) a part of the sampling portion visually similar to an area adjacent the second opening and (b) empty space.
3. The device of claim 1 , wherein in the second relative configuration, a different view is visible through the first opening, the different view comprising one of (a) a part of the sampling portion visually similar to an area adjacent the second opening and (b) empty space.
4. The device of claim 1 , further comprising a spring within the handle to propel at least a portion of the slide member in translation.
5. The device of claim 1 , further comprising an elongated stylet at least partially within the cannula, the stylet having a distal notch whereby tissue can enter the notch and be cut off and contained in the notch by translational travel of the cannula.
6. The device of claim 5 , wherein the slide member is adapted to be propelled translationally to move the cannula over the notch.
7. The device of claim 1 , wherein the at least one visually contrasting portion is at least part of the slide member.
8. The device of claim 1 , wherein the slide member is of the same color as the handle except for a portion of a color visually contrasting with the slide member.
9. The device of claim 1 , wherein the handle has a longitudinal axis generally parallel to a portion of the elongated cannula adjacent to or within the handle, and wherein a line connecting the first and second openings is generally parallel to the longitudinal axis.
10. The device of claim 1 , wherein the first relative configuration is a relative position between the slide member and the surface wherein the slide member is held at rest relative to the surface, and the second relative configuration is a relative position between the slide member and the surface wherein the slide member has been retracted from the first relative configuration and is held at rest relative to the surface.
11. The device of claim 1 , wherein the visually contrasting portion is a portion of an upper surface of the slide member that does not extend through the handle.
12. The device of claim 1 , wherein the at least one visually contrasting portion is not visible through the first and second openings at the same time.