Tissue irrigation arrangement

Details Tissue irrigation arrangement Tissue irrigation arrangement

2000-07-21

2003-10-21

Lo, Weilun (Department: 3761)

Surgery

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

Treating material applied to or removed from external...

C606S131000

Reexamination Certificate

active

06635035

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to apparatus for washing and debriding tissue at various wound sites on the human or animal body.
2. Prior Art
Wound management is a significant portion of all medical practice today. Wounds typically occur from a burn, a contaminated trauma (blunt trauma), chronic ulceration, tendon laceration, abscess cavity to be drained, cellulitus (skin irritation), open bone fracture (compound fracture), and pressure sores. Such wounds and their treatment constitute a large percentage of the treatment provided to medical patients. The number of methods for wound cleansing and debridement have included wound cleansers such as povidone-iodine, hydrogen-peroxide, acetic acid, and chlorinated solutions which however, have cytotoxic effect on cells. Other types of wound cleaning and debridement include piston-type syringe irrigation, whirlpool treatments, wet to dry saline gauze dressings, surgical/medical debridement, enzymatic debridement, absorbent dextranomor microbeads, and pulsed lavage.
Syringe irrigation is sufficient for cleaning most simple wounds. Large complicated wounds, however, require large quantities of irrigant for effective cleansing and debridement. Whirlpool treatments are often utilized for cleansing larger wounds and appear to be common in physical therapy departments. However, with certain deep wounds flushing and debridement is difficult to achieve. The patient must often be uncomfortably positioned in order to direct jets at the wound. If a patient is incontinent, or if multiple wounds are present, cross contamination between those multiple wounds may occur. Wet to dry saline gauze dressings are simple to use and are inexpensive for the patient, but in removal of that dressing they may also damage healthy tissue and may be painful. Such dressing changes may also be a labor intensive procedure.
A relatively new procedure in wound management includes pulsed lavage wherein a pulsating water jet, is directed toward the wound site, which method is fairly effective in removing debris and bacteria from those wounds.
Pulse lavage irrigation devices typically utilize a cone shaped shield, having an open base which is placed over the wound. The shield is utilized to minimize splashing to protect the health care worker and to prevent aerosolization of body fluid. Typically a pan would be held against a lower portion of the skin of a patient being treated. A suction tube may be hung into the pan so as to drain out fluid. The fluid is typically saline or saline with an antibiotic added for wound debridement and sterilization.
A number of such physical devices are shown in the prior art to isolate and permit treatment of certain wound sites. One such device is shown in U.S. Pat. No. 5,447,504 to Baker et al. showing a misting apparatus which comprises a container secured to a limb of a patient at each end, by a rigid cuff. The cuff is held onto the limb by a securement strap and each cuff has an opening to permit an elongated listing tool to be fixedly arranged thereto. This apparatus may be satisfactory for applying a mist to a limb, for the prevention of that limb from drying out, but it has rigid conduits which puts limitations on the manipulability of the device which prevents it from applying a wide range of debriding and cleansing actions. U.S. Pat. No. 3,867,929 to Joyner et al. shows an ultrasonic treatment device in which an acoustically transparent container is wrapped around the limb containing the wound site. The container has ultrasonic transducers spaced therearound for generating acoustic vibrations through a fluid within the container and onto the wound site. This however does not provide the flushing necessary of many wound examples.
A further means for treating surface wounds is shown in U.S. Pat. No. 3,288,140 to McCarthy. This device includes cup like housings which are placed against the wound site to permit containment of the spray from a nozzle and drainage therefrom as well.
Other interesting limb treatment devices are shown in U.S. Pat. No. 3,094,983 to Macleod, U.S. Pat. No. 2,113,253 to Gray, and U.S. Pat. No. 1,105,365 to McQuhae, each showing an unusual containment for a limb to permit bathing or improve blood circulation therewithin. Each of these devices, however are unduly complicated and are not conducive to efficient personalized and adaptive treatment either at home or in the field on the wound of a patient. The prior art requires that the patients wound's conform to the apparatus, and not vice-versa.
It is thus an object of the present invention, to overcome the shortcomings of the prior art.
It is a further object of the present invention, to provide a wound treatment arrangement comprising a self-contained environment around the wound site, which is safe both for the medical practitioner and for the patient.
It is yet a further object of the present invention to provide a wound treatment apparatus which is efficient in its delivery of treatment and efficient in its containment of contaminants.
It is still yet a further object of the present invention to provide a wound treatment apparatus which minimizes possibilities of contamination and maximizes the effectiveness of the irrigation being utilized therewith.Brief
SUMMARY OF THE INVENTION
The present invention comprises an apparatus for the washing and debridement of wounds on limbs and body portions of patients. Such apparatus may be utilized outside of a formal medical facility, and for use in a place such as the home or in the field. It is the intent of this invention to replace or minimize the use of a whirlpool bath, to eliminate cross-contamination of body fluids, and to minimize the spread of bacteria, hepatitis and other staff and pathogenic organisms.
The present invention comprises a flexible envelope of transparent plastic material having a first primary opening for receipt of a body limb or for attachment to a body portion having a wound site thereon. The envelope will include at least one secondary opening having a flexible support collar therearound for insertion of a fluid delivery device. The fluid delivery device may comprise a hand manipulable gun for the delivery of fluid under pressure. The fluid may be a gas and/or fluid mixture. The gas proposed may comprise oxygen or carbon dioxide or hydrogen peroxide useful for sterilization purposes. The flexible envelope covering the wound should contain at least one tertiary port for the drainage and withdrawal of fluid, washed away tissue, and for the release of pressurized gas which has been delivered into the envelope.
In a first preferred embodiment of the present invention, the flexible transparent envelope comprises a bag-like structure having an enlarged central portion with a tapered sealable or securable strap or band disposed adjacent to periphery of the opening at the narrow end. This permits the distal end of an arm or foot to be inserted within the bag for debridement of a wound therein. The invention also includes a pressurized source of fluid which fluid may be a saline solution and a gas such as carbon dioxide or oxygen or the like, supplied by a hand manipulable pressurized gun, the gun fitting in the access port in a snug fitting relation, the access port having the collar which collar may be stretchably elasticized, meeting with the chamber of the gun so as to minimize or eliminate any loss of pressure or fluid from within the envelope. The containment envelope may have a drainage port disposed through the envelope at a position generally diametrically opposed to the access port therein. The drainage port has a conduit which is in fluid communication with a disposable collection bag or a suction line.
In a preferred embodiment of the present invention, the disposable bag itself is in communication with a suction line with the fluid delivery source. The fluid delivery source in this embodiment comprises a drivable motor having an elongated rotor shaft. At one first end of the rotor shaft there is a pump arranged thereon, to provide f

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