CN215079577U - High-frequency electric knife - Google Patents
High-frequency electric knife Download PDFInfo
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- CN215079577U CN215079577U CN202022815198.2U CN202022815198U CN215079577U CN 215079577 U CN215079577 U CN 215079577U CN 202022815198 U CN202022815198 U CN 202022815198U CN 215079577 U CN215079577 U CN 215079577U
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Abstract
The utility model provides a high-frequency electrotome, which comprises a sheath, a first electrode, an insulating connecting piece and a second electrode, wherein the first electrode is connected with the far end of the sheath and can extend out and retract along the axial direction of the sheath; the insulating connecting piece is connected with the far end of the first electrode; the second electrode is electrically connected with the far end of the first electrode, at least part of the second electrode is positioned at the far end of the insulating connecting piece, and the resistance of the second electrode is greater than that of the first electrode. In the high-frequency electrotome of the embodiment of the utility model, when the first electrode is extended out, the first electrode can cut the human tissue, and the second electrode can directly contact the human tissue without causing injury; when the first electrode retracts, the first electrode does not contact with a human body, the second electrode can perform marking operation, the high-frequency electrotome has the cutting and marking functions, the high-frequency electrotome can achieve switching of functions through stretching of the first electrode, and the high-frequency electrotome is simple in structure and convenient to operate.
Description
Technical Field
The utility model belongs to the technical field of medical equipment and specifically relates to a high frequency electrotome is related to.
Background
The common single-stage high-frequency electrotome comprises a rod-shaped electrode and an insulator connected to the head end of the electrode, wherein the electrode can form relatively large contact resistance at the contact part with the tissue after being electrified so as to generate heat to coke or vaporize the tissue, and the insulator is used for abutting against the tissue which is not required to be cut so as to avoid the tissue from being burnt by the discharge of the head end of the electrode. Prior to tissue cutting with a high frequency electrosurgical knife, in order for an operator to accurately capture the surgical field, it is often necessary to perform a local burn on the periphery of the tissue to be cut to mark the field. Due to the fact that multiple functions such as marking and cutting need to be achieved, different instruments need to be replaced for operation in the operation process, operation time is long, and operation of doctors is complex.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a high-frequency electrotome, which can shorten the operation time and relieve the pain of patients.
The utility model provides a high-frequency electrotome, include:
a sheath;
an electrode portion disposed at the distal end of the sheath;
an insulating connector mounted on the distal end of the electrode part through a through hole;
the electrode part comprises a first electrode which is connected with the distal end of the sheath and can extend and retract along the axial direction of the sheath;
the electrode part further comprises a second electrode which is electrically connected with the far end of the first electrode and at least partially exposed from the far end of the insulating connecting piece through the through hole;
the resistivity of the second electrode is greater than a first threshold, and the first threshold is greater than the resistivity of the first electrode.
Further, the distal end of the first electrode extends out of the distal end of the through hole, and the second electrode is a conductive film coated on the distal end of the first electrode, so that the surface of the first electrode exposed outside the distal end of the insulating connecting piece is completely coated.
Further, a proximal end of the first electrode is conductively coupled to a distal end of the second electrode.
Further, the distal end of the second electrode extends out of the distal end of the through hole, and the proximal end face of the second electrode is accommodated in the through hole or is located on the same plane as the distal end face of the insulating connecting piece.
Further, the first electrode and the second electrode are of a revolution body structure with a common revolution axis.
Further, the extending part of the second electrode is a cylinder, a cone or a hemisphere.
Further, at least the outer diameter of the protruding portion of the second electrode is larger than the outer diameter of the first electrode; the inner wall of the through-hole is shaped to conform to a portion of the electrode portion received in the through-hole.
Furthermore, the through hole comprises a first through hole and a second through hole which are arranged along the axial direction of the first electrode, the diameter of the first through hole is smaller than that of the second through hole, the far end of the first electrode is inserted into the first through hole, and the near end of the second electrode is inserted into the second through hole.
Furthermore, the second electrode comprises a working part and a connecting part, the diameter of the working part is larger than that of the connecting part and is positioned on the outer side of the far end of the insulating connecting piece, and the connecting part and the first electrode are inserted into the through hole.
Has the advantages that:
in the high-frequency electrotome of the embodiment of the utility model, when the first electrode is extended out, the first electrode can cut the human tissue, and the second electrode can directly contact the human tissue without causing injury; when the first electrode retracts, the first electrode does not contact with a human body, the second electrode can perform marking operation, the high-frequency electrotome has the cutting and marking functions, the high-frequency electrotome can achieve switching of functions through stretching of the first electrode, and the high-frequency electrotome is simple in structure and convenient to operate.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a perspective view of a high-frequency electric knife according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of the high frequency electric knife of FIG. 1 in an extended state;
FIG. 3 is a cross-sectional view of the high frequency electric knife of FIG. 1 in a retracted state;
fig. 4 is a cross-sectional view of the first and second electrodes of the second embodiment of the present invention when they are connected to the insulating connecting member;
fig. 5 is a cross-sectional view of the first and second electrodes of the third embodiment of the present invention when they are connected to the insulating connecting member;
fig. 6 is a sectional view of a sixth embodiment of the present invention in which a first electrode and a second electrode are connected to an insulating connecting member;
fig. 7 is a sectional view of the seventh embodiment of the present invention when the first electrode and the second electrode are connected to the insulating connecting member.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, but not for indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" on another feature, it can be directly disposed, fixed, or connected to the other feature or indirectly disposed, fixed, connected, or mounted on the other feature. In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
In the related art, the distal end portion of the electric knife is usually an insulator, and the marking operation cannot be performed, so that other instruments need to be replaced during the operation, resulting in an increase in the operation time and increased pain of the patient. Based on the above, the utility model provides a high frequency monopole electrotome with first electrode and second electrode, the second electrode is located the distal end of electrotome, when first electrode and second electrode contact human tissue simultaneously, only the contact department of first electrode and human tissue produces sufficient heat to realize the cutting function, the contact department of second electrode and human tissue does not produce heat or only produces a small amount of heat, avoids causing the damage to human tissue; when only the second electrode contacts human tissue, the contact part of the second electrode and the human tissue generates enough heat, thereby realizing the marking function.
A high-frequency single-pole electric knife according to an embodiment of the present invention will be specifically described below with reference to fig. 1 to 4.
First embodiment
The high-frequency electrotome comprises a sheath 100, an electrode part and an insulating connecting piece 300, wherein the electrode part comprises a first electrode 200 and a second electrode 400, the first electrode 200 is connected with the distal end of the sheath 100 and can extend and retract along the axial direction of the sheath 100, and therefore the switching of the working state of the electrotome is realized. The insulating connector 300 has a through-hole 310, which is connected to the distal end of the first electrode 200 through the through-hole 310. The second electrode 400 is electrically connected with the distal end of the first electrode 200 and at least partially exposed from the distal end of the insulating connector 300 through the through hole 310, so that the marking operation can be conveniently performed, and the first electrode 200, the insulating connector 300 and the second electrode 400 can move synchronously.
As used herein, "distal" refers to the end that is relatively far from the operator, "proximal" refers to the end that is relatively close to the operator, and "distal" and "proximal" are used for relative position and are not meant to be limiting as to the end faces of the members. When referring to "axial" and "radial" of a member, this is for the purpose of illustrating the extension or movement tendency of the member and is not meant to limit the member to a cylinder.
Specifically, the sheath 100 may be a circular tube made of an insulating material, the first electrode 200 may be a long rod-shaped electrode, the first electrode 200 is inserted into the sheath 100, and the whole first electrode 200 may move along the axial direction of the sheath relative to the sheath 100. When the first electrode 200 is in the state shown in fig. 1 and 2, the distal end of the first electrode 200 is located outside the sheath 100, and cutting of tissue can be performed after the power is applied. When the first electrode 200 is in the state shown in fig. 3, the first electrode 200 is located almost entirely or entirely within the sheath 100. The proximal end of the first electrode 200 may be connected to a wire cable 700 via a conductive connection 600 (e.g., a sleeve in fig. 3), the proximal end of the wire cable 700 may be connected to a not-shown operating handle, and an operator may control the axial movement of the first electrode 200 via the operating handle and the wire cable, and at the same time, a not-shown power source may supply power to the first electrode 200 and the second electrode 400 via the wire cable.
When the insulating connector 300 is connected to the electrode portion, at least the distal end of the first electrode 200 is located in the through hole 310, and the second electrode 400 may be completely located outside the insulating connector 300, or may be partially located inside the insulating connector 300 and partially located outside the insulating connector 300.
When the first electrode 200 is extended out and the first electrode 200 and the second electrode 400 are both in contact with the human body, the current has two branches between the first electrode 200 and the power supply, wherein the first branch is the contact position of the first electrode and the human body tissue-the human body tissue, the second branch is the contact position of the second electrode and the human body tissue-the human body tissue, and the two branches are in parallel relation. When the first electrode 200 is retracted and only the second electrode 400 is in contact with the human body, the current has a single third branch between the first electrode 200 and the power source, the third branch being the second electrode-the contact of the second electrode with the human tissue-the human tissue.
In this embodiment, the resistivity of the second electrode 400 is greater than a first threshold, and the first threshold is greater than the resistivity of the first electrode 200, wherein the first threshold is usually much greater than the resistivity of the first electrode 200 and the resistivity of the human body, and the contact resistance is positively correlated with the resistivity of the contact material, so the second contact resistance at the contact position of the second electrode 400 and the human body tissue is also greater than the first contact resistance at the contact position of the first electrode 200 and the human body tissue. Based on the above, when the first electrode 200 and the second electrode 400 both contact with the human body, the total resistivity of the second branch is significantly greater than the resistivity of the first branch, so that the current of the second branch is significantly less than the current of the first branch, and since the heating effect of the electrotome on the human body is positively correlated with the magnitude of the current, when the temperature of the contact portion of the first electrode 200 and the human body tissue reaches the cutting temperature, the temperature of the contact portion of the second electrode 400 and the human body tissue still remains in a lower range, thereby preventing the second electrode 400 from burning the human body tissue.
When the first electrode 200 is in the retracted state shown in fig. 3, only the second electrode 400 can be in contact with the human tissue, and the current flows entirely through the contact portion of the second electrode 400 with the human body, which is at a higher temperature than the state shown in fig. 2, so that the second electrode 400 can perform the marking operation.
Based on the above, the high-frequency electrotome of the embodiment of the application can realize the function switching through the extension and retraction of the first electrode 200, when the first electrode 200 extends out, the first electrode 200 can cut the human tissue, and the second electrode 400 can directly contact the human tissue without causing damage; when the first electrode 200 is retracted, the first electrode 200 does not contact the human body, and the second electrode 400 can perform marking operation, i.e. the high-frequency electric knife has both cutting and marking functions, and has simple structure and convenient operation. In addition, since the second electrode 400 is located at the distal end of the electrotome, marking can be conveniently performed.
In addition, in an actual use scenario, the power of the electric knife when marking is performed is smaller than the power of the electric knife when cutting, so that when switching between marking operation and cutting operation is performed in the related art, in addition to the need to replace the electric knife, the gear of the power supply part needs to be replaced, and the operation is cumbersome. In the high-frequency electrotome, the first threshold value is reasonably set, so that when the first electrode 200 and the second electrode 400 are both contacted with a human body, current basically passes through the first branch circuit, and the second branch circuit can be regarded as a short-circuit state. Meanwhile, since the resistivity of the third branch is also significantly greater than that of the first branch, under the same power supply, the current in the third branch when the first electrode 200 is retracted is also less than that in the first branch when the first electrode 200 is extended, so that the heat generated when the electrotome performs the marking operation through the second electrode 400 is less than that generated when the cutting operation is performed through the first electrode 200, that is, the marking temperature is lower than the cutting temperature, which is suitable for the actual use scenario, and the gear switching of the power supply device is not required, thereby facilitating further simplification of the operation.
Second embodiment
In this embodiment, based on the improvement of the first embodiment, referring to fig. 4, the distal end of the first electrode 200 in this embodiment protrudes from the through hole 310, the second electrode 400 is a conductive film, and the surface of the first electrode 200 exposed outside the distal end of the insulating connector 300 is completely covered by the second electrode 400, so that the distal end of the electric knife is in contact with the human tissue through the second electrode 400 no matter what posture the electric knife is. Therefore, the electric knife in the embodiment can be formed by coating the conductive film on the far end of the common long rod-shaped electrode, and the electric knife is convenient to process and easy to form.
The second electrode 400 may be a known film layer such as an oxide film or a compound polymer film, and a known technique may be used for forming the film layer, which will not be described in detail herein.
Third embodiment
This embodiment is based on a modification of the first embodiment, and referring to fig. 5, in this embodiment, the first electrode 200 and the second electrode 400 are separate members, and the proximal end of the first electrode 200 is conductively connected to the distal end of the second electrode 400. Wherein the first electrode 200 is made of a first material and the second electrode 400 is made of a second material having a resistivity greater than the resistivity of the first material, such that the resistivity of the second electrode 400 is greater than the resistivity of the first electrode 200. In this embodiment, the first electrode 200 and the second electrode 400 are separately formed and then fixedly connected by welding or the like.
Fourth embodiment
This embodiment is based on a modification of the first embodiment, and referring to fig. 1 to 3, 4 and 5, in this embodiment, at least a portion of the second electrode 400 extends from the distal end of the insulating connector 300, so that the second electrode 400 can contact human tissue for marking. The proximal end face of the second electrode 400 is accommodated in the through hole 310 or is located on the same plane as the distal end face of the insulating connector 300, so that the distal end of the first electrode 200 is prevented from being exposed from the distal end of the insulating connector 300, and unnecessary burn caused by the fact that the distal end of the first electrode 200 contacts the human body is avoided. The extension part of the second electrode 400 is a cylinder, a cone or a hemisphere, when the extension part is a cylinder, the second electrode 400 can be conveniently processed, the contact area of the second electrode 400 and human tissues is large, the area of the mark is increased, and the medical staff can conveniently recognize the mark. When the extending part is a cone or a hemisphere, the current density of the contact surface is increased to improve the efficiency of marking the tissue. To facilitate tight coupling of the insulating connector 300 with the electrode part, the inner wall of the through-hole 310 is shaped to fit the portion of the electrode part received in the through-hole 310.
It can be appreciated that the second electrode 400 can also be located inside the insulating connector 300 with the distal end face of the second electrode 400 flush with the distal end face of the insulating connector 300.
Fifth embodiment
In this embodiment, based on the improvement of the third embodiment, referring to fig. 1 to 3, 4 and 5, in this embodiment, the first electrode 200 and the second electrode 400 are both of a solid of revolution structure, and the axes of revolution of the two are collinear, and at least the outer diameter of the extending portion of the second electrode 400 is larger than the outer diameter of the first electrode 200, which is helpful to increase the area of the mark and is convenient for the medical staff to identify. It can be understood that the outer diameters of the first electrode 200 and the second electrode 400 may be equal to each other, so as to facilitate the processing of the electrodes.
Sixth embodiment
This embodiment is based on a modification of the fourth embodiment, and referring to fig. 6, in this embodiment, the insulating connector 300 has a through hole 310, and the through hole 310 may be a straight hole and penetrates through the insulating connector 300 along the axial direction of the first electrode 200. The distal end of the first electrode 200 is inserted into the through hole 310, so that the first electrode 200 and the insulating connector 300 are fixed, wherein the first electrode 200 may be fixed to the insulating connector 300 in an interference fit manner, or may be fixed to the insulating connector 300 in an adhesive manner. The second electrode 400 is located outside the distal end of the insulating connector 300 and is fixedly connected to the first electrode 200.
Seventh embodiment
In this embodiment, based on the modification of the fourth embodiment, referring to fig. 7, in this embodiment, the insulating connector 300 has a first through hole 320 and a second through hole 330 disposed along the axial direction of the first electrode 200, and the diameter of the first through hole 320 is smaller than that of the second through hole 330, and the two are communicated with each other. The distal end of the first electrode 200 is inserted into the first through hole 320, and the proximal end of the second electrode 400 is inserted into the second through hole 330 and fixedly connected to the first electrode 200.
Eighth embodiment
This embodiment is based on a modification of the fourth embodiment, and referring to fig. 5, in this embodiment, the insulating connector 300 has a through hole 310, and the through hole 310 may be a straight hole and penetrates through the insulating connector 300 along the axial direction of the first electrode 200. The second electrode 400 includes a working portion 410 and a connecting portion 420, the diameter of the working portion 410 is larger than the diameter of the connecting portion 420, and the working portion is located outside the distal end of the insulating connector 300, and the connecting portion 420 and the first electrode 200 are inserted into the through hole 310 and connected to each other.
Ninth embodiment
This embodiment is based on a modification of the first embodiment, and referring to fig. 2 and 3, the high-frequency electric knife further includes an insulating spacer 500, and the insulating spacer 500 is connected to the distal end of the sheath 100, surrounds the radially outer side of the first electrode 200, and is used for guiding the axial movement of the first electrode 200. Specifically, the insulating spacer 500 includes a first connecting portion 510 and a second connecting portion 520, the first connecting portion 510 and the second connecting portion 520 are circular tubes, and the diameter of the first connecting portion 510 is greater than that of the second connecting portion 520. The first connection portion 510 is located at the outside of the sheath 100, the second connection portion 520 is located at the inside of the sheath 100, the insulating separator 500 is connected through the sheath 100 of the first connection portion 510 and/or the second connection portion 520, and the first electrode 200 passes through a passage in the insulating separator 500.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (9)
1. High frequency electrotome, characterized in that comprises:
a sheath;
an electrode portion disposed at the distal end of the sheath;
an insulating connector mounted on the distal end of the electrode part through a through hole;
the electrode part comprises a first electrode which is connected with the distal end of the sheath and can extend and retract along the axial direction of the sheath;
the electrode part further comprises a second electrode which is electrically connected with the far end of the first electrode and at least partially exposed from the far end of the insulating connecting piece through the through hole;
the resistivity of the second electrode is greater than a first threshold, and the first threshold is greater than the resistivity of the first electrode.
2. The high-frequency electric knife according to claim 1, wherein the distal end of the first electrode protrudes from the distal end of the through-hole, and the second electrode is a conductive film coated on the distal end of the first electrode, so that the surface of the first electrode exposed to the outside of the distal end of the insulating connector is completely coated.
3. The high frequency electrotome according to claim 1, wherein the proximal end of the first electrode is conductively connected to the distal end of the second electrode.
4. The high-frequency electric knife according to claim 3, wherein the distal end of the second electrode protrudes from the distal end of the through hole, and the proximal end surface of the second electrode is housed inside the through hole or is flush with the distal end surface of the insulating connector.
5. The high frequency electrotome according to claim 4, wherein said first electrode and said second electrode are of a co-rotating axial body structure.
6. The high-frequency electrotome according to claim 5, wherein the protruding portion of the second electrode is a cylinder, a cone or a hemisphere.
7. The high-frequency electrotome according to claim 5, wherein at least the protruding portion of the second electrode has an outer diameter larger than the outer diameter of the first electrode; the inner wall of the through-hole is shaped to conform to a portion of the electrode portion received in the through-hole.
8. The high-frequency electrotome according to claim 7, wherein the through hole comprises a first through hole and a second through hole arranged along the axial direction of the first electrode, the diameter of the first through hole is smaller than that of the second through hole, the distal end of the first electrode is inserted into the first through hole, and the proximal end of the second electrode is inserted into the second through hole.
9. The high-frequency electrotome according to claim 7, wherein the second electrode comprises a working portion and a connecting portion, the working portion has a diameter larger than that of the connecting portion and is located outside the distal end of the insulating connecting member, and the connecting portion and the first electrode are inserted into the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022815198.2U CN215079577U (en) | 2020-11-27 | 2020-11-27 | High-frequency electric knife |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022815198.2U CN215079577U (en) | 2020-11-27 | 2020-11-27 | High-frequency electric knife |
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| CN215079577U true CN215079577U (en) | 2021-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023212605A3 (en) * | 2022-04-26 | 2024-02-01 | Safecirc, Llc | Electrical surgical tools for circumcision |
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- 2020-11-27 CN CN202022815198.2U patent/CN215079577U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023212605A3 (en) * | 2022-04-26 | 2024-02-01 | Safecirc, Llc | Electrical surgical tools for circumcision |
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