Plasma debridement knife
By designing a plasma debridement knife with a retractable working electrode and a return electrode, the problem of tissue damage caused by inconsistent debridement depth in existing technologies has been solved, achieving flexible control of debridement depth and tissue protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU LEK MEDICAL TECH CO LTD
- Filing Date
- 2024-12-25
- Publication Date
- 2026-04-14
AI Technical Summary
Existing plasma debridement instruments can easily cause unnecessary damage to healthy tissue when cleaning wounds of inconsistent depths.
A plasma debridement knife was designed, which includes a retractable working electrode and a return electrode. The electrode wires of different widths are controlled by a telescopic control component to perform debridement, avoiding damage to healthy tissue.
It enables flexible adjustment of the debridement depth according to the wound depth, efficiently cleaning necrotic tissue while protecting healthy tissue and avoiding unnecessary tissue damage.
Smart Images
Figure CN224112747U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to a plasma debridement knife. Background Technology
[0002] Debridement is a basic surgical procedure. The quality of the initial wound treatment plays a decisive role in wound healing and the restoration of the function and morphology of the injured tissue. During debridement, it is necessary to thoroughly remove the tissue that has lost its vitality, while trying to protect and preserve the surviving tissue as much as possible. This is the only way to avoid wound infection, promote healing, and preserve function.
[0003] Traditional debridement methods include surgical debridement, biochemical debridement, and mechanical debridement. Surgical debridement uses surgical methods to remove necrotic tissue from the wound, resulting in a relatively thorough debridement, but it may cause bleeding, damage to normal tissue, and pain that patients may not tolerate. Biochemical debridement uses water-activated dressings and enzyme preparations applied to the wound to remove contaminated tissue, but it requires repeated and regular debridement over a long period, often necessitating consideration of skin protection measures, and some enzyme preparations are expensive. Mechanical debridement mainly uses hydrotherapy irrigation, which cleans the wound surface with saline or cleaning agents using vortex or rinsing methods. It is simple and convenient to operate, but low-pressure irrigation is less effective, and high pressure may damage living tissue.
[0004] Surgical instruments that utilize the principle of low-temperature plasma to clean wounds already exist. Compared with traditional debridement methods, they are more efficient and thorough. Furthermore, because the temperature of low-temperature plasma is between 40°C and 70°C, it causes less thermal damage to human tissues. Additionally, the plasma thin layer has a very high oxidizing effect, which can kill bacteria on the wound surface. At the same time, it has a good bactericidal effect on wounds in human tissues that are difficult for drugs to reach.
[0005] However, there is still room for improvement in this device. For example, the depth of tissue necrosis within a wound is usually inconsistent, but the active electrodes of current plasma debridement devices are usually one or more electrode wires with a relatively large width. This means that when cleaning deeper necrotic tissue, healthy tissue that is preserved in shallower necrotic areas will inevitably be scraped away, causing unnecessary tissue damage.
[0006] Therefore, there is an urgent need for a plasma debridement knife that can avoid unnecessary tissue damage. Utility Model Content
[0007] The purpose of this invention is to provide a plasma debridement knife to solve the technical problems of low debridement efficiency, long debridement cycle and easy to cause unnecessary tissue damage in existing debridement methods.
[0008] To achieve the above objectives, the present invention provides the following technical solution:
[0009] This utility model provides a plasma debridement knife, including a blade assembly, a blade handle, and a handle;
[0010] The cutter head assembly is connected to one end of the cutter bar, and includes a head, on which a working electrode and a return electrode are respectively provided, and the return electrode is provided with a plurality of drip holes;
[0011] The handle is connected to the other end of the tool holder, and a telescopic control component is provided inside it. The telescopic control component is used to control the telescopic state of the working electrode.
[0012] This invention incorporates a telescopic control component, allowing operators to select the appropriate working electrode for debridement based on the specific wound, thus avoiding damage to healthy tissue.
[0013] Optionally or preferably, the working electrode includes a first electrode wire and a second electrode wire with different widths;
[0014] The return electrode includes a first return electrode and a second return electrode; the first return electrode and the second return electrode are connected to a first wire;
[0015] The first return electrode is disposed corresponding to the first electrode wire and forms a first working circuit; the second return electrode is disposed corresponding to the second electrode wire and forms a second working circuit.
[0016] Optionally or preferably, the tool holder is provided with a first steel pipe and a second steel pipe; the first electrode wire and the second electrode wire are respectively connected to the first steel pipe and the second steel pipe;
[0017] The first steel pipe and the second steel pipe extend into the handle and are connected to the telescopic control assembly.
[0018] Both the first steel pipe and the second steel pipe have an insulating layer on their outer surfaces.
[0019] Optionally or preferably, the telescopic control assembly includes an adjustment handle, a rotating shaft fixedly connected to the adjustment handle, and a gear fixedly sleeved on the rotating shaft;
[0020] The first steel pipe has a first rack fixedly connected to one end of the handle, and the second steel pipe has a second rack fixedly connected to one end of the handle. The first rack and the second rack are respectively meshed on both sides of the gear.
[0021] This invention uses the adjustment handle in the telescopic control assembly to drive the gear to rotate, thereby driving the first rack and the second rack to move, which in turn drives the first electrode wire or the second electrode wire to move, so that the first electrode wire or the second electrode wire extends or retracts from the head.
[0022] Optionally or preferably, the telescopic control assembly further includes an anti-reverse mechanism, which includes an adjustment disc fixedly connected to the adjustment handle, a locking post fixedly connected to the adjustment disc, and a locking groove formed on the outside of the handle.
[0023] The locking pin is slidably disposed within the locking groove, and anti-retraction protrusions are provided at both ends of the locking groove. The anti-retraction protrusions are used to lock the locking pin into the two ends of the locking groove.
[0024] By providing anti-retraction protrusions at both ends of the slot, the locking pin can be locked into both ends of the slot, thereby fixing the adjustment handle relative to each other, thus fixing the first electrode wire or the second electrode wire and preventing the first electrode wire or the second electrode wire from shifting during use.
[0025] Optionally or preferably, the handle is provided with a first power contact piece and a second power contact piece, and the first power contact piece and the second power contact piece are connected to the second wire;
[0026] The first steel pipe and the second steel pipe are detachably connected to the second conductor via a first electrical contact piece and a second electrical contact piece, respectively.
[0027] By providing a first electrical contact piece and a second electrical contact piece, and by detachably connecting the first steel pipe and the second steel pipe to the second wire, the first electrode wire and the second electrode wire can change their energizing state according to their extension and retraction states. That is, when the first electrode wire is extended, the first electrode wire is energized while the second electrode wire is not energized; when the second electrode wire is extended, the second electrode wire is energized while the first electrode wire is not energized.
[0028] Optionally or preferably, the head is provided with a suction hole, which is connected to a suction tube.
[0029] Optionally or preferably, the plurality of the drip holes are connected to a drip tube.
[0030] Optionally or preferably, a connector is also included, through which the working electrode and the return electrode are connected to an external device.
[0031] Optionally or preferably, the width of the second electrode wire is smaller than the width of the first electrode wire, and the second electrode wire is positioned above the first electrode wire.
[0032] Based on the above technical solution, this utility model can produce at least the following technical effects:
[0033] This utility model provides a plasma debridement knife, which, by setting working electrodes of different widths, enables it to perform large-area cleaning work, as well as to perform detailed cleaning of deeper necrotic tissue, achieving efficient debridement while avoiding unnecessary tissue damage. Attached Figure Description
[0034] Figure 1 This is a schematic diagram of the overall structure of the plasma debridement knife of this utility model;
[0035] Figure 2 This is a cross-sectional structural diagram of the plasma debridement knife of this utility model;
[0036] Figure 3 yes Figure 2 A magnified view of part A in the middle;
[0037] Figure 4 This is a schematic diagram of the head structure of the plasma debridement knife of this utility model;
[0038] Figure 5 This is a schematic diagram of the internal structure of the handle in the plasma debridement knife of this utility model;
[0039] Figure 6 This is a schematic diagram showing the connection relationship between the slot and the post in the plasma debridement knife of this utility model.
[0040] In the diagram: 100, cutter head assembly; 110, head; 111, suction hole; 120, first electrode wire; 130, second electrode wire; 140, first return electrode; 150, second return electrode; 160, first wire; 170, second wire; 180, drip hole; 200, cutter bar; 210, first steel pipe; 220, second steel pipe; 300, handle; 310, adjusting handle; 320, rotating shaft; 330, gear; 340, first rack; 350, second rack; 360, adjusting disc; 361, locking post; 370, locking groove; 371, anti-retraction protrusion; 380, first power contact piece; 390, second power contact piece; 400, suction tube; 500, drip tube; 600, connector. Detailed Implementation
[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model; obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0042] Example
[0043] Please see Figures 1 to 6 A plasma debridement knife includes a blade assembly 100, a blade 200, and a handle 300 connected in sequence.
[0044] The aforementioned blade assembly 100 includes a head 110 made of ceramic insulating material, on which a working electrode and a corresponding circuit electrode are respectively provided; in order to improve the debridement knife's ability to clean different wounds while avoiding unnecessary tissue damage, in this embodiment, the aforementioned working electrode includes a wider first electrode wire 120 and a narrower second electrode wire 130, as well as a telescopic control assembly for controlling the extension and retraction of the first electrode wire 120 and the second electrode wire 130.
[0045] The loop electrode is a conductive metal sheet (e.g., a stainless steel sheet), which includes a first return electrode 140 and a second return electrode 150. The first return electrode 140 and the second return electrode 150 are connected to a first wire 160. Alternatively, the loop electrode can be configured as a combination of a conductive metal sheet and a metal wire to increase the surface area of the loop electrode. The first return electrode 140 is correspondingly disposed with the first electrode wire 120 to form a first working loop. The second return electrode 150 is correspondingly disposed with the second electrode wire 130 to form a second working loop.
[0046] In this embodiment, the telescopic control component can control the extension and retraction of the first electrode wire 120 and the second electrode wire 130, and at the same time, it can also control the working state of the first working circuit and the second working circuit.
[0047] Specifically, a first steel pipe 210 and a second steel pipe 220 are provided inside the tool holder 200. The first electrode wire 120 and the second electrode wire 130 are welded to the first steel pipe 210 and the second steel pipe 220 respectively. The first steel pipe 210 and the second steel pipe 220 are both connected to the telescopic control component inside the handle 300. In order to ensure the insulation between the first steel pipe 210 and the second steel pipe 220, in this embodiment, an insulating layer is also provided outside the first steel pipe 210 and the second steel pipe 220.
[0048] In this embodiment, the telescopic control component includes an adjustment handle 310, with a rotating shaft 320 fixedly connected to both ends of the adjustment handle 310. The rotating shaft 320 passes through the handle 300, and a gear 330 is fixedly sleeved on the outside of the rotating shaft 320. It is understood that the operator can turn the adjustment handle 310 to make the gear 330 rotate. At the same time, the portions of the first steel pipe 210 and the second steel pipe 220 extending into the handle 300 are respectively fixedly connected to a first rack 340 and a second rack 350. The first rack 340 and the second rack 350 are respectively meshed on both sides of the gear 330. It is understood that when the gear 330 rotates, the first rack 340 and the second rack 350 respectively drive the first steel pipe 210 and the second steel pipe 220 to move in different directions, so that the first electrode wire 120 extends while the second electrode wire 130 retracts, or the second electrode wire 130 extends while the first electrode wire 120 retracts.
[0049] In order to ensure that the first and second working circuits are energized only in the working state, that is, the second electrode wire 130 is not energized when the first electrode wire 120 is extended (or the first electrode wire 120 is not energized when the second electrode wire 130 is extended), in this embodiment, a first power contact piece 380 and a second power contact piece 390 are respectively provided in the handle 300. Both the first power contact piece 380 and the second power contact piece 390 are connected to the second wire 170. The first steel pipe 210 and the second steel pipe 220 are detachably connected to the second wire 170 through the first power contact piece 380 and the second power contact piece 390, respectively.
[0050] For example, when the operator moves the adjustment handle 310 backward, the end of the second steel pipe 220 disengages from the second electrical contact piece 390, and the end of the first steel pipe 210 disengages from the first electrical contact piece 380. At this time, the first electrode wire 120 extends out of the head 110, and the second electrode wire 130 is in the retracted state.
[0051] To prevent the first electrode wire 120 or the second electrode wire 130 from shifting during use, in this embodiment, the telescopic control component also includes an anti-retraction mechanism. The anti-retraction mechanism includes an adjustment plate 360 fixedly connected to both ends of the adjustment handle 310, a locking post 361 fixedly connected to the adjustment plate 360, and a slot 370 opened on the outer shell of the handle 300, wherein the locking post 361 is slidably disposed in the slot 370.
[0052] In this embodiment, the slot 370 is an arc-shaped slot, and anti-retraction protrusions 371 are provided at both extreme positions of the arc-shaped slot. The anti-retraction protrusions 371 can lock the locking post 361 at both ends of the slot 370, thereby preventing the electrode wire from dislodging during use.
[0053] In this embodiment, drip holes 180 are equally spaced on the first return electrode 140 and the second return electrode 150, and are connected to the drip tube 500 for dripping physiological saline to the operating site.
[0054] In this embodiment, an attraction hole 111 is provided at the head 110 and above the second electrode wire 130, and the attraction hole 111 is connected to the attraction tube 400. It should be noted that in order to ensure the attraction effect, the width of the attraction hole 111 should be at least greater than the width of the second electrode wire 130.
[0055] In this embodiment, both the first wire 160 and the second wire 170 are connected to a connector 600, and an external power supply device is connected through the connector 600.
[0056] The plasma debridement knife provided by this utility model works on the following principle:
[0057] In the initial state, the locking pin 361 is engaged with the rear end of the locking slot 370. At this time, the first electrode wire 120 extends from the front end of the insulating ceramic head 110, and the end of the first steel tube 210 contacts the first power contact piece 380. Simultaneously, the second electrode wire 130 retracts into the insulating ceramic head 110, and the end of the second steel tube 220 separates from the second power contact piece 390 (i.e., no current flows through the second electrode wire). The connector 600 is connected to the plasma host, and saline solution flows out through the drip hole 180. A large amount of plasma is generated at the first electrode wire 120 to clean the wound over a large area. After the wound is cleaned as a whole, if there is still some deep necrotic tissue that has not been cleaned, since the area of necrotic tissue to be cleaned is small at this time, in order to avoid damaging the function... For normal tissue, the adjustment handle 310 can be moved forward until the locking post 361 engages with the front end of the locking slot 370. The gear 330 rotates counterclockwise, driving the first rack 340 to move backward and simultaneously driving the second rack 350 to move forward. At this time, the first steel tube 210 moves backward, causing the first electrode wire 120 to retract into the insulating ceramic head 110 and the end of the first steel tube 210 to separate from the first power contact piece 380. The second steel tube 220 moves forward, pushing out the second electrode wire 130 and the end of the second steel tube 220 to contact the second power contact piece 390. At this time, after energizing, plasma can be generated on the second electrode wire 130 to clean up the remaining deeper necrotic tissue. Since the second electrode wire 130 is narrow, it will not damage the surrounding normal tissue.
[0058] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A plasma debridement knife, characterized in that, It includes a cutter head assembly (100), a cutter shank (200), and a handle (300); The cutter head assembly (100) is connected to one end of the cutter bar (200), and includes a head (110). The head (110) is provided with a working electrode and a return electrode, and the return electrode is provided with a plurality of drip holes (180). The working electrode includes a first electrode wire (120) and a second electrode wire (130) with different widths; The return electrode includes a first return electrode (140) and a second return electrode (150), and the first return electrode (140) and the second return electrode (150) are connected to a first wire (160); The first return electrode (140) is correspondingly disposed with the first electrode wire (120) and forms a first working circuit; the second return electrode (150) is correspondingly disposed with the second electrode wire (130) and forms a second working circuit. The handle (300) is connected to the other end of the tool holder (200), and a telescopic control component is provided inside it. The telescopic control component is used to control the telescopic state of the working electrode.
2. The plasma debridement knife according to claim 1, characterized in that, The tool holder (200) is provided with a first steel pipe (210) and a second steel pipe (220); the first electrode wire (120) and the second electrode wire (130) are respectively connected to the first steel pipe (210) and the second steel pipe (220); The first steel pipe (210) and the second steel pipe (220) extend into the handle (300) and are connected to the telescopic control assembly; Both the outer surfaces of the first steel pipe (210) and the second steel pipe (220) are provided with an insulating layer.
3. The plasma debridement knife according to claim 2, characterized in that, The telescopic control assembly includes an adjustment handle (310), a rotating shaft (320) fixedly connected to the adjustment handle (310), and a gear (330) fixedly sleeved on the rotating shaft (320); The first steel pipe (210) is fixedly connected to a first rack (340) at one end of the handle (300), and the second steel pipe (220) is fixedly connected to a second rack (350) at one end of the handle (300). The first rack (340) and the second rack (350) are respectively meshed on both sides of the gear (330).
4. The plasma debridement knife according to claim 3, characterized in that, The telescopic control assembly also includes an anti-reverse mechanism, which includes an adjustment disc (360) fixedly connected to the adjustment handle (310), a locking post (361) fixedly connected to the adjustment disc (360), and a locking groove (370) opened on the outside of the handle (300). The locking pin (361) is slidably disposed in the locking groove (370). Anti-retraction protrusions (371) are provided at both ends of the locking groove (370). The anti-retraction protrusions (371) are used to lock the locking pin (361) in the two ends of the locking groove (370).
5. The plasma debridement knife according to claim 3, characterized in that, The handle (300) is provided with a first power contact piece (380) and a second power contact piece (390), and the first power contact piece (380) and the second power contact piece (390) are connected to the second wire (170); The first steel pipe (210) and the second steel pipe (220) are detachably connected to the second conductor (170) through the first power contact piece (380) and the second power contact piece (390), respectively.
6. The plasma debridement knife according to claim 1, characterized in that, The head (110) is provided with a suction hole (111), and the suction hole (111) is connected to a suction tube (400).
7. The plasma debridement knife according to claim 1, characterized in that, The plurality of the drip holes (180) are connected to drip tubes (500).
8. The plasma debridement knife according to claim 1, characterized in that, It also includes a connector (600) through which the working electrode and the return electrode are connected to an external device.
9. The plasma debridement knife according to claim 1, characterized in that, The width of the second electrode wire (130) is smaller than the width of the first electrode wire (120), and the second electrode wire (130) is positioned above the first electrode wire (120).