Needle device

Details Needle device Needle device

1998-10-27

2001-04-24

Stright, Jr., Ronald K. (Department: 3762)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C604S167030, C604S158000, C604S246000, C604S506000

Reexamination Certificate

active

06221048

ABSTRACT:

BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to needle devices, and more particularly to medical devices for introducing a needle and/or catheter into a body cavity a patient.
(2) Prior Art
The present application incorporates by reference my co-pending application, Ser. No. 07/788,253, filed Nov. 5, 1991 no U.S. Pat. No. 5,207,647.
A veress needle has a hollow, blunt inner needle, spring loaded, within a larger piercing cannula, to permit entry into a body space without laceration of obdominal structures. Several patents which disclose such devices are as follows:
U.S. Pat. No. 5,139,485 to Smith et al, which shows a spring loaded with an acoustic alarm to indicate passage of the needle into a space in a body.
U.S. Pat. No. 5,104,381 to Gresl et al, with a viewable indicator on a stylet to indicate penetration.
U.S. Pat. No. 5,098,388 to Kulkashi et al, having a porthole for receiving a fluid coupling permitting fluid to be passed into the needle.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a needle device which, when cocked, permits penetration of its distal tip into a body until it senses a space or void. The tip, which is a needle, is then retracted automatically and locked within the device, preventing further cutting capabilities of that trocar.
The present invention comprises a needle device having an elongated housing. The housing has a proximal and a distal end. An opening is arranged through the proximalmost end of the housing. A carriage shaft is disposed within the housing and extends slightly outwardly of the proximal opening.
An elongated cannula is attached to the distal end of the housing through a hub. The distalmost end of the cannula has a tip thereon. A needle is slidably disposed through the cannula. The distal end of the needle has a pointed tissue piercing tip. The proximal end of the needle (or trocar) is engaged with a detent assembly arranged at the distal end of the carriage shaft. The needle is hollow, allowing an endoscope (fiber optic camera) or other device to be place therethrough.
A first compressive spring is arranged within the housing to provide a proximally directed bias onto the carriage shaft. A second compressive spring is arranged within the housing, about the proximal end of the needle, but which spring has less force than the first spring. The distal end of the second spring keeps a forwardly or distally directed bias upon a flange on the needle. The proximal end of the second spring engages the distal end of the carriage shaft. The needle has a proximally extending finger or link which engages a detent assembly. The link rotates the detent assembly to effectuate rearward retraction of the carriage shaft and the needle with respect to the housing.
A valve in the proximal end of the cannula or catheter, is coaxial therewith, and is disposed within a cap and base assembly. Opon removal of the needle from the catheter, the cap and base assembly can be rotated with respect to one another, to open or close the valve therein.
The housing can be removed from the cannula/hub assembly to permit valvable access to the body space through the cannula. A stopcock is attached to the hub assembly to permit insuflation of a patient through the cannula. Insuflation is the pumping of carbon dioxide into a body (peritoneal) cavity to distent the fascis skin.
In operation of the present invention, the needle device is initially cocked by the attending physician, by pressing upon the proximalmost end of the carriage shaft. This causes the detent assembly to become engaged with the carriage shaft and compresses the first spring. The needle is also caused to extend outwardly slightly beyond the distal end of the cannula, causing the exposure of the cutting tip of the needle.
Penetration of skin, tissue and ligaments by gently force applied to the device into a patient, causes a slight rearward pressure and movement on the needle, simultaneously compressing the second spring and causing the link to move to a position that upon any forward motion of the needle link assembly, the link will rotate the detent assembly and thus release the carriage.
Upon entry of the needle into the body space, the needle is advanced distally very slightly by bias of the second spring thereagainst. This slight forward or distal advance of the needle causes the link attached to it to trip the detent assembly, thus releasing the carriage shaft from capture, whereupon the first, more powerful spring pushes the carriage shaft and attendently attached needle rearwardly or proximally, with an audible sound. This causes the needle to also be retracted proximally within the cannula. The proximal end of carriage shaft is also caused to extend out through the opening in the proximal end of the housing, to provide a visual indication of penetration into the body space, as well as the audible indication of such entry. A bore extends longitudinally through the carriage shaft, and is in communication with the bore in the needle. An optical device such as an endoscope, or a medicament supply may be disposed within such bore to permit visualization of the puncture and body organ and/or supply of medicaments therein.
Dissassembly of the cannula from the housing and opening of the bore of the catheter permits delivery of medicaments or other medical devices. The valve could be closed to close the bore through that cannula. A valved side port through the base permits the valve at the proximal end of the cannula to be closed (or open) while permitting supply of medicaments therethrough simultaneously with optics or other medicaments being disposed through the valve in the base.
It is apparent that this device may also be used to locate/enter other spaces or potential spaces in the body where there is less resistance than in the surrounding tissue, such as with the pneumothorax needles, drainage of absesses or the like.


REFERENCES:
patent: 4654030 (1987-03-01), Moll et al.
patent: 4902280 (1990-02-01), Lander
patent: 4931042 (1990-06-01), Holmes et al.
patent: 5116353 (1992-05-01), Green
patent: 5207647 (1993-05-01), Phelps
patent: 5376082 (1994-12-01), Phelps
patent: 5514111 (1996-05-01), Phelps

Affiliated with

Also associated with

Rating

Needle device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Needle device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Needle device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2445670