# US 10,478,244 B2 · Electrosurgical pencil > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,478,244 B2 - Document ID: US10478244B2 - Status: Granted - Kind: B2 - Application number: 16/182,516 - Filed: 2018-11-06 - Published: 2019-03-14 - Granted: 2019-11-19 - Earliest claimed: 2011-05-19 - Assignees: Cimpax ApS - Applicants: Cimpax Aps - Inventors: Michael Busch-Madsen; Patrick Busch-Madsen - Web page: https://patentgrep.com/patent/US10478244B2 ## CPC - A61B 18/1477: {Needle-like probes} - A61B 2018/00607: {Coagulation and cutting with the same instrument} - A61B 2018/1412: {Blade} - A61B 2218/006: for smoke evacuation - A61B 2218/008: for smoke evacuation - F04C 2270/0421: Controlled or regulated - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract An extendable electrosurgical pencil adapted to receive an electrode controllable by an electrical signal for performing surgical operations, including a housing that comprises first and second housing parts with a main housing part therebetween, a flexible printed circuit, a switch on the main housing part that is adapted to be activated from outside the housing for closing the flexible circuit, and an electrode receiver on the first housing part, wherein the first housing part is adapted to slide inside the main housing part to provide a telescopic extension of the pencil, the electrode and the flexible printed circuit following the sliding movement. ## Claims ### Claim 1 Extendable electrosurgical pencil (400) adapted to receive an electrode (1) controllable by an electrical signal for performing surgical operations, comprising: a housing that comprises a first housing part (35) and a second housing part (6), and a main housing part (4) between the first housing part (35) and the second housing part (6), a flexible printed circuit (2), switching means (71) on the main housing part (4) of the housing and being adapted to be activated from outside the housing for closing the flexible circuit (2), and the first housing part (35) comprises receiving means (41) for receiving the electrode, wherein the first housing part (35) is adapted to slide inside the main housing part (4) to provide a telescopic extension of the pencil (400), the electrode (1) and the flexible printed circuit (2) following the sliding movement. ### Claim 2 (depends on 1) Electrosurgical pencil (400) according to claim 1, wherein the first housing part (35) of the electrosurgical pencil (400) has sliding means (451,443) to telescopically extend the electrode (1) from the first housing part (35). ### Claim 3 (depends on 2) Electrosurgical pencil (400) according to claim 2, wherein the sliding means comprises a guide (451) and a support member (443), which is adapted to slide in the guide (451). ### Claim 4 (depends on 3) Electrosurgical pencil (400) according to claim 3, wherein the first housing part (35) accommodates an element, which element comprises the support member (443) and (444) and the receiving means (41) for holding the electrode (1). ### Claim 5 (depends on 2) Electrosurgical pencil (400) according to claim 2, wherein extension of the electrode (1) is accomplished by pulling the electrode (1), which remain in the receiving means (41) and in contact with the flexible printed circuit (2) while being extended from the first housing part (35). ### Claim 6 (depends on 1) Electrosurgical pencil (400) according to claim 1, wherein the flexible printed circuit (2) is of a paper-thin flexible material having a control structure printed upon it, wherein the flexible printed circuit (2) remains in contact with both the electrode (1) and the switching means (3). ### Claim 7 (depends on 6) Electrosurgical pencil (400) according to claim 6, wherein the paper-thin flexible material is a foil. ### Claim 8 (depends on 1) Electrosurgical pencil (400) according to claim 1, wherein the electrosurgical pencil (40) is provided with a locking means such that the first housing part (35) cannot be pulled completely out of the electrosurgical pencil (400). ### Claim 9 (depends on 8) Electrosurgical pencil (400) according to claim 8, wherein the sheath has a thickness that is greater than 0.35 mm in the area of the switching means. ### Claim 10 (depends on 1) Electrosurgical pencil (400) according to claim 1, wherein the switching means (3,71) comprises a switch (3) and an actuator (71). ### Claim 11 (depends on 10) Electrosurgical pencil (400) according to claim 10, wherein the first portion of the flexible printed circuit (21) is positioned between the actuator (71) and the switch (3). ### Claim 12 (depends on 1) Electrosurgical pencil (400) according to claim 1, wherein the electrosurgical pencil (400) further comprises a suction channel along the length in the interior of the pencil (400). ### Claim 13 (depends on 1) Electrosurgical pencil (400) according to claim 1, further comprising friction means between the main housing part (4) and the first housing part (35). ### Claim 14 (depends on 1) Electrosurgical pencil (400) according to claim 1, further comprising a sheath (7) that encloses the main housing part (4). ### Claim 15 (depends on 14) Electrosurgical pencil (400) according to claim 14, wherein the sheath (7) is made of a material that provides friction between the first housing part (35) and the sheath (7), which keeps the first housing part (35) in position during use of the electrosurgical pencil (400). ### Claim 16 (depends on 14) Electrosurgical pencil (400) according to claim 14, wherein the sheath (7) is made of silicone. ### Claim 17 Electrosurgical pencil (400) adapted to receive an electrode (1) controllable by an electrical signal for performing surgical operations, comprising: a housing that comprises a first housing part (35) and a second housing part (6), and a main housing part (4) between the first housing part (35) and the second housing part (6), a flexible printed circuit (2), switching means (71) on the main housing part (4) of the housing and being adapted to be activated from outside the housing for closing the flexible circuit (2), and the first housing part (35) comprises a receiving means (41) for receiving the electrode, wherein the first housing part (35) is adapted to slide inside the main housing part (4) to provide a telescopic extension of the pencil (400), the electrode (1) and the flexible printed circuit (2) following the sliding movement, and wherein the flexible printed circuit comprises a first portion (21) and a second portion (22), wherein the second portion (22) is folded substantially parallel to the first portion (21), when mounted in the housing, wherein the second portion of the flexible printed circuit (22) extends into the receiving means (41) of the housing. ### Claim 18 Electrosurgical pencil (400) adapted to receive an electrode (1) controllable by an electrical signal for performing surgical operations, comprising: a housing that comprises a first housing part (35) and a second housing part (6), and a main housing part (4) between the first housing part (35) and the second housing part (6), a flexible printed circuit (2), switching means (71) on the main housing part (4) of the housing and being adapted to be activated from outside the housing for closing the flexible circuit (2), and the first housing part (35) comprises a receiving means (41) for receiving the electrode, wherein the first housing part (35) is adapted to slide inside the main housing part (4) to provide a telescopic extension of the pencil (400), the electrode (1) and the flexible printed circuit (2) following the sliding movement, and wherein the exterior of the electrosurgical pencil (400) has a substantially triangular shape defined by the area ratio between a first triangle (310) which circumscribes said substantially triangular shape and a second triangle (320) inscribed in said substantially triangular shape, is between 1:1 and 3:1. ### Claim 19 (depends on 18) Electrosurgical pencil (400) according to claim 18, wherein at least one corner (340) of the substantially triangular shape (330) has a radius of curvature that is between 1 mm and 5 mm or that is between 2 mm and 4 mm.