Patent Application
20160317214
N/A
N/A
Electrosurgical forceps that are used in surgical procedures have a pair of resilient blades or arms that are used for grasping and coagulating tissue. The forceps may be monopolar or bipolar. In monopolar forceps, the blades are welded or otherwise joined to form an electrode in electrical communication with an electrical generator. Current flows from the active electrode through the patient's tissue to a dispersive electrode in contact with the patient's skin (which may be at some distance from the forceps) and back to the generator. In bipolar forceps, each blade of the pair comprises an electrode in communication with an electrical generator. Current flows from one blade through the tissue to the other blade. A suitable connector for electrical connection to the generator is provided at the proximal end of the forceps.
In some forceps, the blades are curved so that the tips at the distal are offset from the proximal end. The offset provides a better line of sight for the surgeon. Some forceps also include a serrated region along the body of the blades to provide a finger grip for the surgeon.
The invention provides an electrosurgical forceps that includes a soft grip. The soft grip comprises a gripping pad formed from a compliant or resilient material provided in a gripping region of the forceps. The material of the gripping pad provides a non-slip or textured surface that is easier for a physician to grasp, particularly when wearing gloves that have become moist or wet. The gripping pad does not interfere with current flow along the electrode blade. It cannot be easily removed from the forceps blade.
The invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings in which:
Referring to
The proximal ends 16 are electrically connected in any suitable manner, such as by crimping, welding, or soldering, to terminal pins 26. The proximal ends along with the terminal pins are encapsulated using an epoxy-based material or otherwise mounted within an insulating cap portion 28. The blade members may be insulated with an insulating material 30 along most of their length from the cap portion to a location close to the tip. Alternatively, the blade members may be uninsulated. A plating of an electrically and thermally conductive biocompatible material such as gold may be provided on the tip of an insulated blade member or over the tip and over the entire body of an uninsulated blade member.
The blade members 12, 14 can be formed of any material or combination of materials that provides suitable strength and electrical conductivity. The material may also be thermally conductive in some embodiments. Suitable materials include stainless steel, nickel, copper, silver, titanium, and alloys of any of these metals. Composite materials, such as silver/nickel composites, can also be used.
Each blade member 12, 14 includes a mid portion 32 between the proximal end 16 and the distal end 18. A gripping region 34 is formed in the mid portion. The gripping region includes at least one aperture 36 formed completely through the blade member. In the embodiment shown, two apertures are provided. Current is able to flow around the periphery of the apertures when the forceps are in use.
A gripping pad 40 formed from a compliant or resilient material is disposed in the aperture or apertures 36 in the gripping region 34 of the blade member 12, 14. The gripping pad includes a pad member 42 having a gripping surface 44 for contact by the fingers of the physician when using the forceps. The gripping surface 44 can be flat or curved. In one embodiment, the surface has a slight concave curvature. The pad member 42 has an area that is larger than and overlies the area of the aperture 36, or if multiple apertures 36 are used, a continuous area that is larger than and overlies the multiple apertures. An edge portion 46 of the pad member defines an area that extends beyond the periphery 48 of the aperture or apertures 36. An inner surface 52 of the edge portion 46 is in contact with the outer surface 22 of the blade member 12, 14 continuously around the periphery 48 of the aperture 36 or, if more than one aperture is used, around an outer periphery of the combined apertures 36. The edge portion 46 assists in retaining the gripping pad 40 on the blade 12, 14.
The gripping pad 40 also includes one or more retaining members 56 and one or more connecting pillars 60 between the pad member 42 and the retaining member or members 56. Each connecting pillar 60 extends through an associated aperture 26 in contact with side walls 62 of the aperture, so that it can form a press fit or interference fit within the aperture. Each retaining member includes an edge portion 58 extending beyond the periphery 48 of the adjacent aperture 36 on the inner surface 24 of the blade member 12, 14. An inner surface 59 of the edge portion 58 is in contact with the inner surface 24 of the blade member 12, 14 around the periphery 48 of the aperture 36. The edge portion 58 of the retaining member 56 helps to retain the gripping pad 40 within the aperture 36 on the blade 12, 14. Once the gripping pad 40 has been inserted into the aperture 36 in the blade 12, 14, it is no longer readily removable. Similarly, once installed, the gripping pad does not slide or shift around with respect to the surfaces of the blade. In this manner, the gripping pad provides a stable surface for the physician to grasp the forceps.
In the embodiment shown, two connecting pillars 60 and two retaining members 56 are provided. It will be appreciated that a single connecting pillar 60 and single retaining member 56 can be used. Alternatively, a larger number of connecting pillars and retaining members can be used. Additionally, multiple separated gripping pads 40 can be used. Also, it will be appreciated that a gripping pad or pads can be provided on only one of the two blades of the forceps if desired.
In the embodiment illustrated, the mid portion 32 of each blade 12, 14 includes an elongated arm 72 extending between the gripping region 34 and the distal end 18. Each arm has a width that is more narrow than a width of the gripping region. Also, each arm includes a curved portion 74 extending from the gripping region and narrowing or tapering in width toward the distal end, and a straight portion 76 between the curved portion 74 and the distal end 18. This configuration provides a clear line of sight to the tip 20 for the physician when holding the forceps at the gripping region. It will be appreciated that the blades can also be straight or have other curved configurations.
The gripping pad 40 is formed of a medical grade soft or gel-like material, such as a thermoplastic elastomer (TPE), rubber, silicone rubber, or flexible polyvinyl chloride (PVC). Suitable TPEs include thermoplastic polyurethanes. In one embodiment, the material is selected to have good slip resistance when moist or wet, such as when contacted by a surgeon wearing a wet glove. One suitable thermoplastic elastomer known as C-Flex® is commercially available from Saint-Gobain. In some embodiments, the material can have a hardness value less than 50 on the Shore A scale. Materials with other hardness values can be used. Other materials can be used if desired, such as, without limitation, styrenic block copolymers, polyolefin blends, elastomeric alloys, thermoplastic copolyesters, and thermoplastic polyamides; natural and synthetic rubbers such as, nitrile, millable polyurethane, silicone, butyl and neoprene, or other thermoset elastomers or other thermoplastic polymers. A plasticizer is generally not necessary with many suitable materials but could be used if desired, depending on the material and application.
In one embodiment, the gripping surface of the pad member 42′ of gripping pad 40′ can include a texture 82. For example, the surface can include raised or recessed elements. The raised or recessed elements can have any shape or configuration. In the embodiment illustrated in
The gripping pad can be manufactured in any suitable manner. In one embodiment, the gripping pad is molded, such as by injection molding. In another embodiment, the gripping pad can be overmolded on the blade. In a further embodiment, the gripping pad can be fabricated by an additive manufacturing technique or three-dimensional printing technique.
After fabrication, the gripping pad is press fit into the aperture or apertures in the blade. See
It will be appreciated that the various features of the embodiments described herein can be combined in a variety of ways. For example, a feature described in conjunction with one embodiment may be included in another embodiment even if not explicitly described in conjunction with that embodiment.
The present invention has been described in conjunction with certain preferred embodiments. It is to be understood that the invention is not limited to the exact details of construction, operation, exact materials or embodiments shown and described, and that various modifications, substitutions of equivalents, alterations to the compositions, and other changes to the embodiments disclosed herein will be apparent to one of skill in the art.
