Sampling device and method of retrieving a sample

Details Sampling device and method of retrieving a sample Sampling device and method of retrieving a sample

2000-01-28

2001-07-24

Nasser, Robert L. (Department: 3736)

Surgery

Diagnostic testing

Sampling nonliquid body material

C600S564000, C606S167000

Reexamination Certificate

active

06264618

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to sampling devices and methods of retrieving a sample. The device and method disclosed herein may be used to obtain a sample of bone from a patient.
2. Discussion of Related Art
Existing methods of percutaneous bone biopsy involve placement of a needle into the bone using a fluoroscope or cat-scan to guide a physician to properly position the needle. The needle is then moved axially within the bone, slightly changing the angle of the needle with each advancement to provide samples of the bone to the interior channel of the needle. The interior channel of the needle is aspirated to remove body fluids. Normally, the needle must be rocked back and forth to fracture the bone in order to provide the sample. Once the bone sample is obtained, the needle is removed and the bone sample is evaluated.
Frequently, the bone sample is left behind when the needle is withdrawn and no bone is obtained. If an inadequate sample is obtained, or if multiple samples are required, the procedure must be repeated, thereby increasing the cost of the procedure, exposing the patient and medical personnel to harmful x-rays, in the case where a fluoroscope is used to properly position the needle, and exposing the patient to additional risk corresponding to complications from the procedure.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a device for and method of performing a bone biopsy. The foregoing objective is realized by the present invention, which includes a sampling device and a method of retrieving a sample. The device includes a cannula having a first end and a second end. The first end has a threaded section.
The present invention also includes a method of obtaining a bone sample. The method includes providing a stylet, providing a cannula having an axial channel, and inserting the stylet into the axial channel. Then, the stylet is connected to the cannula to form an assembly, and the assembly is inserted into a body to place an end of the cannula proximate to a sample location. Next, the stylet is disconnected, and the cannula is twisted to engage an end of the cannula in a part of the body. The stylet is removed from the axial channel, and a core collector is inserted in place of the stylet. Once the core collector is connected to the cannula, the cannula is twisted to further engage the end of the cannula in the part of the body, and to embed a portion of the core collector in the part of the body, so that a sample to be retrieved resides in the core collector. Then, the core collector is disconnected from the cannula, and removed from the cannula.


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