Surgical cutting tool

Abstract

The present application provides a surgical cutting tool to solve the problem of excessive cutting resistance of the existing cutting tool. It includes an outer sleeve with a containing space, one end of the outer sleeve has a placing entrance which is connected with the containing space, and the outer sleeve has an exposed hole; and an inner tube located in the containing space to rotate relative to the outer sleeve, the inner tube has a cutting part which is located in the exposed hole of the outer sleeve, the cutting part has an opening, a plurality of tooth edges are arranged in the axial direction on at least one side hole edge of the opening, and the adjacent two tooth edges have a tooth pitch, and the plurality of tooth pitches between the plurality of tooth edges have at least two different tooth pitches.

Description

Technical Field

[0001] This invention relates to a cutting tool, and more particularly to a surgical cutting tool for performing tissue cutting. Background Technology

[0002] Radical surgery is a commonly used treatment method that achieves therapeutic goals by removing predetermined tissue. Examples include the removal of tumors, necrotic tissue, or tissue severely damaged due to accidents. The cutting tool used in these tissue removal procedures has a serrated edge, which is driven at high speed by a motor built into a drive unit. This cuts and removes the affected tissue. However, during high-speed rotation, irregular resonances can occur at multiple points on the serrated edge, creating excessive resistance during tissue cutting. This makes it difficult for the surgeon to cut the tissue smoothly, potentially leading to incomplete tissue removal. Furthermore, the increased temperature caused by these irregular resonances during high-speed rotation can place excessive stress on the surrounding tissue, resulting in poor wound healing and increasing the risk of surgical failure.

[0003] In view of this, there is indeed a need to improve existing cutting tools. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a surgical cutting tool that can reduce cutting resistance.

[0005] A secondary objective of the present invention is to provide a surgical cutting tool that can reduce the temperature rise caused by vibration.

[0006] The directions or similar terms used throughout this invention, such as "front," "back," "left," "right," "top," "bottom," "inner," "outer," and "side," are mainly based on the directions in the accompanying drawings. These directions or similar terms are only used to assist in explaining and understanding the various embodiments of this invention and are not intended to limit this invention.

[0007] The use of the quantifiers “a” or “an” for components and parts described throughout this invention is for convenience and to provide the general meaning of the scope of the invention; in this invention, it should be interpreted as including one or at least one, and a single concept also includes plural cases, unless it clearly means otherwise.

[0008] The terms "combination," "integration," or "assembly" used throughout this invention mainly refer to the types of connections that allow for separation without damaging the components, or connections that make the components inseparable. These are options that those skilled in the art can choose based on the material of the components to be connected or the assembly requirements.

[0009] The surgical cutting tool of the present invention comprises: an outer tube having a receiving space, one end of the outer tube having an insertion port communicating with the receiving space, the outer tube having an exposed hole; and an inner tube located in the receiving space and rotatable relative to the outer tube, the inner tube having a cutting portion facing the exposed hole in the outer tube, the cutting portion having an opening, a plurality of cutting edges arranged axially in at least one side edge of the opening, a tooth pitch between adjacent two cutting edges, the plurality of tooth pitches between the plurality of cutting edges having at least two different tooth pitches.

[0010] Therefore, the surgical cutting tool of the present invention, by having at least two different tooth pitches among the multiple tooth edges of the cutting part, can reduce the occurrence of multi-harmonic resonance, thereby enabling each tooth edge to vibrate uniformly. This reduces cutting resistance and improves cutting smoothness. Furthermore, by reducing the resonance of the multiple tooth edges, the temperature rise of the tooth edges caused by resonance can be mitigated, preventing damage to tissue cells at the wound site due to the temperature of the tooth edges, thus preventing postoperative tissue necrosis and improving surgical quality.

[0011] The outer tube may have a stop portion that closes the end opposite to the insertion port. Thus, the stop portion prevents the inner tube from dislodging and also shields the front end of the inner tube to prevent it from contacting tissue not intended for removal.

[0012] The maximum radial width of the exposed hole in the outer sleeve can be 1 / 3 to 2 / 3 of the outer diameter of the outer sleeve. This allows the cutting portion of the inner tube to be fully exposed for tissue cutting.

[0013] The hollow portion of the inner tube forms a flow channel, and a discharge hole penetrates the wall of the inner tube to connect with the flow channel. Thus, the flow channel can be used to discharge removed tissue.

[0014] The opening can penetrate the wall of the inner tube to connect the flow channel. This allows the tissue removed by the cutting part to enter the flow channel and be discharged through the opening.

[0015] The multiple cutting edges can be arranged on the two opposite side edges of the opening. In this way, the inner tube has a cutting effect regardless of whether it rotates clockwise or counterclockwise.

[0016] The tooth pitch can range from 0.05 to 30 mm. This allows it to be used for cutting tissues in different parts of the body.

[0017] The tooth pitch of the multiple cutting edges can be distributed from the end adjacent to the inner tube to the end away from that end, forming a distribution with the spacing increasing from small to large. This has the effect of reducing the occurrence of multiple harmonic resonances.

[0018] In this design, the tooth pitch between any two adjacent tooth edges can be different. This reduces the occurrence of multiple harmonic resonances.

[0019] Each cutting edge has a tooth height, which can range from 0.05 to 30 mm. This allows it to be used for cutting tissues in different areas. Attached Figure Description

[0020] Figure 1 : An exploded perspective view of the first embodiment of the present invention;

[0021] Figure 2 : A combined diagram of the first embodiment of the present invention;

[0022] Figure 3 :along Figure 2 AA-line cross-section;

[0023] Figure 4 : A diagram of the toothed edge structure according to the second embodiment of the present invention;

[0024] Figure 5 : Schematic diagram of the surgical cutting tool of the present invention used in a surgical handpiece.

[0025] Explanation of reference numerals in the attached figures

[0026] 1: Outer tube

[0027] 11: Place the entrance

[0028] 12: Stopping part

[0029] 13: Exposed holes

[0030] 2: Inner pipe fittings

[0031] 21: Driver End

[0032] 22: Flow channel

[0033] 23: Discharge port

[0034] 24: Cutting section

[0035] 25: Opening

[0036] 25a: Side hole edge

[0037] 26: Toothed edge

[0038] 3: Drive components

[0039] 31: Clamping part

[0040] 32: Suction tract

[0041] S: Storage space

[0042] W1: Maximum diameter

[0043] W2: Outer diameter width

[0044] D: Tooth pitch

[0045] H: Tooth height. Detailed Implementation

[0046] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments of the present invention are described below in conjunction with the accompanying drawings; in addition, those symbols that are used in different drawings are considered to be the same and their descriptions will be omitted.

[0047] Please refer to Figure 1 , Figure 2 As shown, this is a first embodiment of the surgical cutting tool of the present invention, which includes an outer tube 1 and an inner tube 2. The inner tube 2 is located inside the outer tube 1 and can rotate relative to the outer tube 1.

[0048] Please refer to Figure 1 , Figure 3 As shown, the outer tube 1 has a receiving space S, which can be formed by the hollow portion of the outer tube 1. One end of the outer tube 1 has an insertion port 11, which connects to the receiving space S, and the inner tube 2 can be assembled into the receiving space S through the insertion port 11. The outer tube 1 may have a stop portion 12, which can close the end opposite to the insertion port 11. The outer tube 1 has an exposed hole 13, which can penetrate the tube wall of the outer tube 1 to connect to the receiving space S.

[0049] The exposed hole 13 can be an elongated through hole to form an axial extension on the outer sleeve 1. Specifically, the maximum radial width W1 formed by the exposed hole 13 of the outer sleeve 1 can be 1 / 3 to 2 / 3 of the outer diameter width W2 of the outer sleeve 1 (e.g., Figure 3 As shown), the radial cross-section of the outer sleeve 1 at the exposed hole 13 is slightly U-shaped. Thus, the exposed hole 13 forms a flat cut in the outer sleeve 1, exposing a portion of the accommodating space S. The exposed hole 13 is preferably adjacent to the stop end 12, so that the end face of the stop end 12 is slightly semi-circular.

[0050] The inner tube 2 extends into the receiving space S through the inlet 11. The outer diameter of the inner tube 2 is slightly smaller than the inner diameter of the outer tube 1, so that the inner tube 2 can rotate relative to the outer tube 1. The inner tube 2 has a drive end 21, which protrudes from the inlet 11, allowing the inner tube 2 to rotate directly or indirectly via a drive component such as a motor. The inner tube 2 has a flow channel 22, which can be formed from the hollow portion of the inner tube 2. A discharge hole 23 penetrates the wall of the inner tube 2 to connect to the flow channel 22, and the discharge hole 23 is preferably adjacent to the drive end 21. The inner tube 2 has a cutting portion 24, preferably located at the end of the inner tube 2 away from the drive end 21. The cutting part 24 can be positioned within the exposed hole 13 of the outer tube 1, so that the inner tube 2 can be located inside the outer tube 1 and exposed only by the cutting part 24, so as to avoid other parts of the inner tube 2 from contacting normal tissue that is not intended to be removed when the inner tube 2 rotates, thus preventing damage to the normal tissue.

[0051] The inner tube 2 has an opening 25 located in the cutting section 24. The opening 25 penetrates the wall of the inner tube 2 to connect with the flow channel 22, allowing tissue removed by the cutting section 24 to enter the flow channel 22 through the opening 25. The opening 25 can be an elongated through-hole extending axially into the inner tube 2, forming a flat cut in the inner tube 2. The cutting section 24 has multiple cutting edges 26 arranged sequentially in the axial direction at at least one side edge 25a of the opening 25. When the inner tube 2 rotates, the cutting edges 26 can cut the tissue. Preferably, the multiple cutting edges 26 are arranged on two opposite side edges 25a of the opening 25, so that the multiple cutting edges 26 can cut the tissue whether the inner tube 2 rotates clockwise or counterclockwise.

[0052] Please refer to Figure 3 , Figure 4 As shown, the tooth shape of the plurality of cutting edges 26 is not limited, but preferably, the tooth shape of each cutting edge 26 is the same. The physician can select the appropriate tooth shape of the plurality of cutting edges 26 according to the different needs of the tissue being cut. For example, the plurality of cutting edges 26 can be multiple pointed teeth or multiple trapezoidal teeth. In this embodiment, each cutting edge 26 is a trapezoidal tooth. In this way, while removing the tissue, the removed tissue can be cut into smaller fragments. The collected tissue fragments can be used for autologous tissue repair by the patient.

[0053] It is worth noting that there is a tooth pitch D between two adjacent toothed blades 26. When the plurality of toothed blades 26 are arranged on a virtual straight line, the tooth pitch D can be the shortest distance between two adjacent toothed blades 26 in the direction of the virtual straight line. The plurality of tooth pitches D between the plurality of toothed blades 26 include at least two different tooth pitches D, which can be 0.05 to 30 mm. The distribution of the different tooth pitches D can be sequential according to the size of the tooth pitch D, or it can be an irregular distribution. For example, the tooth pitch D of the plurality of toothed blades 26 can be distributed from the end adjacent to the inner tube 2 toward the direction away from that end, forming a distribution with the spacing increasing from small to large (e.g., Figure 3 (As shown). Alternatively, the tooth pitch D of the plurality of toothed blades 26 can be distributed in a pattern from the end adjacent to the inner tube 2 toward the end away from that end, with the spacing increasing and then decreasing (as shown). Figure 4 (As shown). In another embodiment, the tooth pitch D between any two adjacent cutting edges 26 can be of different widths.

[0054] Thus, the plurality of cutting edges 26 of the surgical cutting tool of the present invention have at least two different tooth pitches D. When the inner tube 2 rotates at high speed, the occurrence of multiple harmonic resonances of the plurality of cutting edges 26 can be reduced, thereby enabling each cutting edge 26 to vibrate uniformly, unlike existing multiple cutting edges with equidistant tooth pitches which produce multiple harmonic resonances and exhibit uneven vibration distribution. In addition, each cutting edge 26 has a tooth height H, which can be 0.05 to 30 mm. Preferably, the plurality of cutting edges 26 can include at least two different tooth heights H, and the tooth heights H are sequentially formed from low to high from one end adjacent to the inner tube 2 toward the direction away from that end. This also helps to reduce the resonance of each cutting edge 26.

[0055] Please refer to Figure 5As shown, when the surgical cutting tool of the present invention is used, the inner tube 2 can be driven to rotate at high speed by a drive unit 3, so that the cutting part 24 can cut the tissue to be removed. The drive unit 3 can be an existing surgical handpiece. One end of the drive unit 3 can have a clamping part 31, which can clamp the outer tube 1. The driving end 21 of the inner tube 2 can be connected to a drive mechanism such as a motor inside the drive unit 3. In addition, the discharge hole 23 of the inner tube 2 can be connected to a suction channel 32 inside the drive unit 3, and a micro pump inside the drive unit 3 or an external pump can be used to create suction between the suction channel 32 and the flow channel 22 of the inner tube 2. Thus, the drive unit 3 drives the inner tube 2 to rotate at high speed, so that the multiple teeth 26 of the exposed cutting part 24 cut the tissue to be removed. The tissue cut off by the multiple teeth 26 can fall into the flow channel 22 through the opening 25 of the cutting part 24 and be extracted through the suction channel 32 to keep the flow channel 22 unobstructed. In this way, tissue can be continuously removed and discharged through the flow channel 22, so that the operation can be performed smoothly.

[0056] In summary, the surgical cutting tool of the present invention, by having at least two different tooth pitches among the multiple tooth edges of the cutting part, can reduce the occurrence of multi-harmonic resonance, thereby enabling each tooth edge to vibrate uniformly. This reduces cutting resistance and improves cutting smoothness. Furthermore, by reducing the resonance of the multiple tooth edges, the temperature rise of the tooth edges caused by resonance can be mitigated, preventing damage to tissue cells at the wound site and postoperative tissue necrosis, thus improving surgical quality.

[0057] While the present invention has been disclosed using the preferred embodiments described above, it is not intended to limit the invention. Any modifications and alterations made by those skilled in the art to the above embodiments without departing from the spirit and scope of the invention are still within the scope of protection of the present invention. Therefore, the scope of protection of the present invention includes all changes within the meaning and equivalent scope of the claims. Furthermore, when the above embodiments can be combined, the present invention includes any combination of implementation methods.

Claims

1. A surgical cutting tool, characterized in that, include: An outer tube having a receiving space, one end of the outer tube having an insertion port communicating with the receiving space, and the outer tube having an exposed hole; and An inner tube is located in the accommodating space and is rotatable relative to the outer tube. The inner tube has a cutting portion facing an exposed hole in the outer tube. The cutting portion has an opening. A plurality of cutting edges are arranged axially in at least one side edge of the opening. There is a tooth pitch between two adjacent cutting edges. The plurality of tooth pitches between the plurality of cutting edges have at least two different tooth pitches.

2. The surgical cutting tool as described in claim 1, characterized in that, The outer tube has a stop that closes the end opposite to the inlet.

3. The surgical cutting tool as described in claim 1, characterized in that, The maximum radial width of the exposed hole in the outer sleeve is 1 / 3 to 2 / 3 of the outer diameter of the outer sleeve.

4. The surgical cutting tool as described in claim 1, characterized in that, The hollow portion of the inner tube forms a flow channel, and a discharge hole penetrates the tube wall of the inner tube to connect the flow channel.

5. The surgical cutting tool as described in claim 4, characterized in that, The opening penetrates the wall of the inner tube to connect the flow channel.

6. The surgical cutting tool as described in claim 1, characterized in that, The multiple cutting edges are arranged on the two opposite side edges of the opening.

7. The surgical cutting tool as described in claim 1, characterized in that, The tooth pitch is 0.05–30 mm.

8. The surgical cutting tool as described in claim 1, characterized in that, The tooth pitch of the multiple cutting edges is distributed from the end adjacent to the inner tube to the end away from that end, with the spacing increasing from small to large.

9. The surgical cutting tool as described in claim 1, characterized in that, The tooth pitch between any two adjacent tooth edges is different.

10. The surgical cutting tool as described in claim 1, characterized in that, Each tooth has a tooth height of 0.05 to 30 mm.

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