Surgical system having manifolds with integral pneumatic accumulators

The present invention relates generally to surgical systems and more specifically to surgical systems that control pneumatic devices.

Many microsurgical procedures require precision cutting and/or removal of various body tissues. For example, certain ophthalmic surgical procedures require the cutting and/or removal of the vitreous humor, a transparent jelly-like material that fills the posterior segment of the eye. The vitreous humor, or vitreous, is composed of numerous microscopic fibers that are often attached to the retina. Therefore, cutting and removal of the vitreous must be done with great care to avoid traction on the retina, the separation of the retina from the choroid, a retinal tear, or, in the worst case, cutting and removal of the retina itself.

Conventional vitrectomy probes typically include a hollow outer cutting member, a hollow inner cutting member arranged coaxially with and movably disposed within the hollow outer cutting member, and a port extending radially through the outer cutting member near the distal end thereof. Vitreous humor is aspirated into the open port, and the inner member is actuated, closing the port. Upon the closing of the port, cutting surfaces on both the inner and outer cutting members cooperate to cut the vitreous, and the cut vitreous is then aspirated away through the inner cutting member. This cutting action may be made using an electric cutter, but pneumatically driven probes operating at a relatively high pressure are more common.

Additionally, during typical ophthalmic procedures, air or other fluid may be introduced into the posterior chamber. This air must be of relatively low pressure (on the order of 3-4 psi). As the infusion of fluids into an eye is done at low pressures, this portion of the surgical procedure can extend for some period of time, so to protect against an unexpected loss in power, accumulation of some reserve pressure is desirable. Prior art devices have used pressure accumulators, receivers or tanks to

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Accordingly, a need continues to exist for a surgical system having a simplified, compact construction,

Brief Summary of the Invention

The present invention improves upon prior art by providing a surgical system having all of the various pneumatic control sub-systems or sub-manifolds integrally mounted on a common primary manifold. The various required control mechanisms 45 such as valves are likewise integrally mounted to the common manifold and to the sub-manifolds, Within any or all of the sub-manifolds or primary manifolds, volumes of material not necessary for the operation of the manifold are carved or pocketed out and used to form integral accumulators for storing extra pressurized air. The volume of the accumulator can vary according to the pressurized air requirement of the 50 particular manifold, or the overall pneumatic system.

One objective of the present invention is to provide a surgical system having integrated pneumatic sub-systems.

Another objective of the present invention is to provide a surgical system having pneumatic sub-systems mounted on a common manifold.

Yet another objective of the present invention is to provide a surgical system for controlling pneumatic surgical devices.

Yet another objective of the present invention is to provide a surgical system for controlling pneumatic surgical devices having integral accumulators for storing extra pressurized air.

These and other advantages and objectives of the present invention will become apparent from the detailed description, drawings and claims that follow.

Brief Description ofthe Drawings

FIG. 1 is a front perspective view of a surgical console that may use the integral pneumatic manifold of the present invention.

FIG. 2 is a front perspective view of a cassette that may be used with the present invention.

FIG. 3 is a rear perspective view of a cassette that may be used with the

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FIG. 4 is an exploded perspective view of the integral pneumatics manifold of the present invention.

׳ FIG. 5 is a perspective view of the valve or pincher manifold ofthe present invention and illustrating several active mechanical elements mounted on the 75 manifold.

FIGS. 6a - 6b are perspective views of manifolds that may be used with the present invention.

Detailed Description ofthePreferred Embodiments

As best seen in FIGS. 1, 2 and 3, cassette 10 that may be used with the present invention generally included valve plate 12, body 14 and cover 16. Valve plate 12, body 14 and cover 16 may all be formed of a suitable, relatively rigid, and thermoplastic. Valve plate 12 contains a plurality of openings 18 and pumping 85 channel 20 that are sealed fluid tight by elastomers 22 and 24, forming a plurality of fluid paths. Ports 26 provide connectors between cassette 10 and surgical console 100 for the various irrigation and aspiration (pneumatic) functions of cassette 10 when cassette 10 is installed in cassette receiving portion 110 of console 100.

As best seen in FIG. 4, manifold assembly 200 contains a plurality of sub90 assemblies or manifolds mounted to common primary manifold 210. For example, manifold assembly 200 may additionally contain aspiration manifold 220, and/or infusion/irrigation manifold 230 and/or valve or pincher manifold 240. As seen in FIG. 5, for example, each of manifolds 210, 220, 230 and 240 (manifold 240 used as an illustrative example) are self-contained, and may contain necessary the valves, 95 regulators, sensors or other active embedded mechanical, electrical or electromechanical devices required to perform each manifold’s primary function, such as air cylinders 245, by way of example. Manifolds 220 and 230 pneumatically and fluidly communicate with cassette 10 through primary manifold 210, and communication between the patient and cassette 10 is controlled by pincher manifold 100 240. Primary manifold 210 may be mounted in cassette receiving portion 110 of console 100 so that cassette 10 may be fluidly coupled to primary manifold 210. Primary manifold 210 may additionally contain pumps and fluid level and/or fluid

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Such a construction allows for the separation of the primary functionalities of each sub-assembly onto specific manifolds, thereby providing convenient and fast assembly, troubleshooting and repair. In addition, such a construction eliminates most of the various tubings and tubing connectors used in the prior art to connect the various components in each sub-assembly and reduces the overall size of the completed assembly.

As best seen in FIG. 6a, primary manifold 210 contains pneumatic accumulators 310 and 312, which store pressurized air for infusion and reflux pressure, respectively. As seen in FIG. 6b, pincher manifold 240 contains pneumatic accumulators 314 and 316, which store pressurized air associated with a low pressure air source (not shown). As can also been seen in FIG. 6b, pincher manifold 240 contains a plurality of air passages 320 for directing pressurized air within pincher manifold 240 and among manifolds 210, 220, 230 and the valves, regulators, sensors or other active embedded mechanical, electrical or electromechanical devices required to perform each manifold’s primary function, such as air cylinders 245. Accumulators 310, 312, 314 and 316 are illustrative examples only, and one skilled in the art will recognize that similar accumulators may be contained in any or all of manifolds 210, 220, 230 and 240. Accumulators 310, 312, 314 and 316 are integrally formed in their respective manifolds in otherwise unused portion of manifolds 210, 220, 230 and 240. Such a construction provides additional pressurized air storage for use in the event of power loss in a compact, reliable manner.

This description is given for purposes of illustration and explanation. It will be apparent to those skilled in the relevant art that modifications may be made to the invention as herein described without departing from its scope or spirit.