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Pressure regulated irrigation system for arthroscopy
| Details |
Inventors: Santangelo, John A.; Worrick, III, Charles B.;
Assignee: Codman & Shurtleff, Inc. (Randolph, MA)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A pressure regulated system for an irrigation system including a reservoir of irrigation fluid, a pump, catheters for providing access to and egress from the irrigation site and a pressure regulation circuit, all connected in series with one another. The pressure regulation circuit includes a flow restriction branch having a normally-open valve and a variable orifice, diaphragm-operated, restrictor and a pressure accumulation branch, having a check valve, accumulator, and a normally-closed valve. A conduit running from the pressure accumulation branch to the diaphragm controls the pressure regulator. The operator may raise the pressure by closing the normally-open valve to direct pump flow to the pressure accumulation branch and thereby restrict the orifice of the pressure regulator until the desired pressure has been reached, and then releases the valve to maintain that pressure. To reduce the pressure, one opens the normally-closed valve to vent the pressure accumulation branch and reduce the pressure in the diaphragm of the pressure regulator. |
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DETAILED DESCRIPTION The present invention provides an apparatus for raising and lowering the pressure in the arthroscopy operative (or any other relatively sealed operative site which could be subjected to a pressurized flow) without adjusting the height of the saline reservoir on the intravenous stand.
It is preferably a closed system through which the irrigation fluid can be recirculated, but it can also function as a nonrecirculating system.
The apparatus used in the pressure-regulated irrigation system includes devices for providing access to and egress from the irrigation site.
These can be catheters or other types of devices, e.
g.
, instruments, introduced to the operative site through the surrounding tissue.
When the catheter is introduced through the skin, the surrounding tissue tends to close around the exterior of the catheter to provide a seal.
This system also includes a reservoir of irrigation fluid and a pump (preferably a vacuum operated pump) which can be connected to the irrigation site, for example by standard intravenous tubing.
The tubing provides a tight seal with the catheters to avoid leakage.
A pressure-regulation circuit is connected into the fluid system in series with the pump and the reservoir.
The pressure regulation circuit permits the operator to actuate a first control to elevate the pressure in the irrigation site to a desired level and to maintain the pressure at that desired level when the first control is deactivated.
The pressure regulation circuit also permits the operator to actuate a second control to reduce the pressure at the irrigation site to a base level determined by the height of the reservoir and to maintain the pressure at that reduced level when the second control is deactivated.
In its preferred embodiment, the pressure-regulation circuit is connected in series with the pump and includes a flow restriction branch having a normally-open valve connected in series with a variable pressure regulator.
The pressure-regulation circuit also includes a pressure accumulation branch connected in parallel with the flow restriction branch and having a check valve, (to permit flow only in one direction from the injection site into the pressure accumulation branch), an accumulator and a normally-closed valve
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