Puncture skin cutting knife
By designing a puncture cutting knife with a fixed guide tube and a pointed blade, the problem of the sharp blade being difficult to accurately enter the puncture point is solved, and the accuracy and efficiency of cutting the skin is achieved, which facilitates the normal operation of the skin expander and the smooth insertion of the catheter.
Patent Information
- Application Number
- CN202421632918.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-11
AI Technical Summary
In clinical practice, it is difficult for the sharp blade to accurately approach the guidewire and enter the puncture point, resulting in the cut skin being not connected to the puncture point, which in turn leads to difficulty in entering the skin expander and even failure in catheter placement.
A puncture cutting knife is designed, with a pointed blade and a guide tube fixed to the handle, the outer side wall of the guide tube is closely fitted with the tip of the pointed blade, and the guide wire can pass through the guide tube. The tool's structure ensures that the tip blade can accurately approach the guide tube and enter the puncture point to cut the skin.
Through the design of this puncture and cutting knife, the sharp blade can quickly and accurately enter the puncture point and cut the skin, so that the skin expander can enter the subcutaneous skin and further expand the subcutaneous tissue, ensuring the catheter smoothly enters the target position, and reducing the catheter time and consumables.
Smart Images
Figure CN223026121U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a puncture skin cutting knife. Background Art
[0002] In a large number of medical scenarios in clinical practice, the Seldinger technique is required, that is, a guide wire guides a catheter to enter a target position in the body through the skin. For example: central venous puncture as an infusion access, blood purification catheter placement as a blood purification access, IABP pump placement, ECMO catheter placement, percutaneous tracheotomy, etc. After the guide wire enters the target position in the above operations, before the dilator dilates the skin, it is often necessary to use a sharp blade to cut the skin on both sides closely along the guide wire, so as to facilitate the dilator to enter the subcutaneous tissue and further dilate the blood vessel wall or other target tissues, ensuring that the catheter can smoothly enter the target position.
[0003] In actual clinical operations, due to continuous bleeding at the puncture site (especially arterial puncture) and the frequent swallowing or coughing movements of the patient during percutaneous tracheotomy, the sharp blade often cannot accurately approach the guide wire and enter the puncture site, resulting in the cut skin not being connected to the puncture site, which in turn makes it difficult for the dilator to enter the skin, and even causes the tip of the dilator to crack or the tip of the sheath to crack, ultimately leading to an extended catheterization time, replacement of consumables, or catheterization failure. Summary of the Utility Model
[0004] In view of this, the utility model aims to provide a puncture skin cutting knife, which can enable the sharp blade to quickly and accurately enter the puncture site along the guide wire, complete skin cutting, and then help the subsequent dilator and catheter to enter the target position.
[0005] To achieve the above object, the technical solution of the utility model is realized as follows:
[0006] A puncture skin cutting knife includes a handle, a sharp blade, and a guiding tube. The sharp blade and the guiding tube are both fixed on the handle, and the tip of the sharp blade is in close contact with the outer wall of the guiding tube without gaps. The guide wire can pass through the guiding tube.
[0007] Furthermore, a through perforation is provided inside the handle, and the guiding tube is fixedly inserted into the perforation.
[0008] Furthermore, the sharp blade and the guiding tube are arranged side by side left and right, and a clamping groove for clamping the back of the sharp blade is further provided on the outer wall of the guiding tube.
[0009] Furthermore, the handle is fixedly connected by two splints, and the sharp blade and the guiding tube are fixedly clamped between the two splints.
[0010] Further, on one side of each of the two splints facing each other, there is a fixing groove for clamping the pointed blade, and the size of the fixing groove matches the size of the pointed blade; in the fixing groove of one of the splints, there is a convex fixing block for inserting into the through hole on the pointed blade; on one side of each of the two splints facing each other, there is also a corresponding long and narrow arc-shaped groove, and the two arc-shaped grooves together form a perforation for the guiding tube and the guide wire to pass through.
[0011] Further, a reinforcement assembly is provided on the handle. The reinforcement assembly includes a connecting piece and a retaining post. The connecting piece is vertically fixed on the handle, and the retaining post is perpendicularly fixed on the connecting piece. The retaining post is located outside the guiding tube and is in contact with the side wall of the guiding tube. The retaining post applies an external force to the guiding tube to ensure that the back of the pointed blade is tightly clamped in the clamping groove.
[0012] Further, the retaining post is arranged close to the tip of the blade, and is located at 1 / 2 - 1 / 3 of the distance between the tip of the blade and the upper end of the handle.
[0013] Further, a reinforcement assembly is provided on the outer side wall of the guiding tube. The reinforcement assembly is a fixed clamping block, and the back of the pointed blade is clamped in the fixed clamping block.
[0014] Further, the fixed clamping block is arranged in the middle and lower part of the guiding tube.
[0015] Further, the pointed blade and the guiding tube are arranged side by side front and back.
[0016] Compared with the prior art, the puncture skin cutting knife of the present utility model has the following advantages:
[0017] For the puncture skin cutting knife of the present utility model, both the pointed blade and the guiding tube are fixed on the handle, and the tip of the pointed blade is in close contact with the outer side wall of the guiding tube without gaps. The structure of this puncture skin cutting knife enables the guiding tube to enter the guide wire tunnel, and at the same time, the pointed blade can accurately approach the guiding tube to cut the skin at the puncture point, thereby facilitating the dilator to enter the subcutaneous tissue and further expand the subcutaneous tissue, blood vessel wall or other target tissues, and ensuring that the catheter can smoothly enter the target position. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:
[0019] Figure 1 is a schematic structural diagram of the puncture skin cutting knife according to Embodiment 1 of the present utility model;
[0020] Figure 2 is an internal structure diagram of the puncture skin cutting knife according to Embodiment 1 of the present utility model;
[0021] Figure 3Schematic structural diagram of the puncture skin cutting knife described in Embodiment 2 of the present utility model;
[0022] Figure 4 Schematic structural diagram of the puncture skin cutting knife described in Embodiment 3 of the present utility model;
[0023] Figure 5 Usage state diagram of the puncture skin cutting knife described in Embodiment 3 of the present utility model;
[0024] Figure 6 Schematic structural diagram of the puncture skin cutting knife described in Embodiment 4 of the present utility model;
[0025] Figure 7 Skin cutting effect diagram of the puncture skin cutting knife described in Embodiment 4 of the present utility model.
[0026] Explanation of reference numerals:
[0027] 1. Handle; 11. Fixed groove; 12. Raised fixed block; 13. Support piece; 14. Perforation; 2. Sharp blade; 3. Guide tube; 31. Card slot; 4. Reinforcement component; 41. Connecting piece; 42. Stopper post; 5. Guide wire; 6. Puncture point; 7. Cut seam. Detailed implementation manners
[0028] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.
[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.
[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0031] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.
[0032] Embodiment 1
[0033] As Figure 1-2 shown, a puncture skin cutting knife includes a handle 1, a pointed blade 2, and a guiding tube 3. The pointed blade 2 and the guiding tube 3 are both fixed on the handle 1, and the tip of the pointed blade 2 is in close contact with the outer side wall of the guiding tube 3 without gaps, and a guide wire 5 can pass through the guiding tube 3.
[0034] Exemplarily, a through perforation 14 is provided inside the handle 1, and the guiding tube 3 is fixedly inserted into the perforation 14.
[0035] Exemplarily, the pointed blade 2 and the guiding tube 3 are arranged side by side left and right, and a clamping groove 31 for clamping the back of the pointed blade 2 is further provided on the outer side wall of the guiding tube 3. The clamping groove prevents the pointed blade from being misaligned with the guiding tube during the cutting process.
[0036] Specifically, the handle 1 is fixedly connected by two clamping plates, and the pointed blade 2 and the guiding tube 3 are fixedly clamped between the two clamping plates.
[0037] More specifically, fixing grooves 11 for clamping the pointed blade 2 are provided on one side of the two clamping plates facing each other, and the size of the fixing grooves 11 matches the size of the pointed blade 2; a raised fixing block 12 for inserting into the through hole on the pointed blade 2 is provided in the fixing groove 11 of one of the clamping plates; narrow and long arc-shaped grooves are correspondingly provided on one side of the two clamping plates facing each other, and the two arc-shaped grooves jointly form a perforation 14 for the guiding tube 3 and the guide wire 5 to pass through.
[0038] More specifically, a supporting piece for supporting the pointed blade is further provided at the top of the clamping plate provided with the raised fixing block 12, and the raised fixing block extends to the supporting piece, and the supporting piece can play a role in strengthening and stabilizing the pointed blade.
[0039] During use, the guide wire is passed through the guiding tube, the guiding tube slides down along the guide wire until the tip of the guiding tube penetrates into the puncture point, the guiding tube is continuously moved downward until the tip of the blade coincides with the puncture point, the skin cutting knife is continuously pushed downward to separate the skin, and then the skin cutting knife is pulled out upward and rotated 180 degrees, and the above operations are repeated, so as to symmetrically cut two incisions on both sides of the puncture point. The incisions are asFigure 5 As shown, the two incisions are on the same straight line.
[0040] The structure of the puncture skin cutter enables the guiding tube to enter the guide wire tunnel, and at the same time, the tip blade can accurately approach the guiding tube to cut the skin at the puncture point, so as to facilitate the dilator to enter the subcutaneous tissue and further expand the subcutaneous tissue, blood vessel wall or other target tissues, ensuring that the catheter can smoothly enter the target position.
[0041] Embodiment 2
[0042] As Figure 3 shown, a puncture skin cutter, on the basis of the above-mentioned Embodiment 1, a reinforcement component 4 is provided on the handle 1. The reinforcement component 4 includes a connecting piece 41 and a retaining post 42. The connecting piece 41 is vertically fixed on the handle 1, and the retaining post 42 is vertically fixed on the connecting piece 41. The retaining post 42 is located outside the guiding tube 3 and is in contact with the side wall of the guiding tube 3. The retaining post 42 applies an external force to the guiding tube 3 to ensure that the back of the tip blade 2 is tightly stuck in the card slot 31.
[0043] Specifically, the retaining post 42 is arranged close to the tip of the knife, and is located at 1 / 2 - 1 / 3 of the distance between the tip of the knife and the upper end of the handle 1.
[0044] Embodiment 3
[0045] As Figure 4 shown, a puncture skin cutter, on the basis of the above-mentioned Embodiment 1, a reinforcement component 4 is provided on the outer side wall of the guiding tube 3. The reinforcement component 4 is a fixed clamping block. The back of the tip blade 2 is stuck in the fixed clamping block. The fixed clamping block further fixes the fixed connection relationship between the tip blade and the guiding tube, avoiding the dislocation between the tip blade and the guiding tube during the cutting process.
[0046] More specifically, the fixed clamping block is arranged at the middle and lower part of the guiding tube 3.
[0047] Embodiment 4
[0048] As Figure 6-7 shown, a puncture skin cutter, different from the above-mentioned Embodiment 1, the tip blade 2 and the guiding tube 3 are arranged side by side front and back.
[0049] When cutting, this puncture skin cutter can also quickly and accurately enter the puncture point to complete skin cutting, but the two incisions formed are both tangent to the puncture point, forming parallel incisions, which are not as beautiful as the incisions cut in Embodiment 1.
[0050] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A puncture and skin cutting knife, characterized in that: The utility model comprises a handle, a sharp blade and a guide tube, wherein the sharp blade and the guide tube are both fixed on the handle, and the tip of the sharp blade is closely fitted to the outer wall of the guide tube without leaving any gap, and the guide wire can pass through the guide tube.
2. The puncture and skin cutting knife according to claim 1, characterized in that: A through hole is provided inside the handle, and the guide tube is fixedly inserted in the through hole.
3. The puncture and skin cutting knife according to claim 1, characterized in that: The sharp blade and the guide tube are arranged side by side on the left and right sides, and a clamping groove for clamping the back of the sharp blade is also arranged on the outer side wall of the guide tube.
4. The puncture and skin cutting knife according to claim 3, characterized in that: The handle is formed by two splints fixedly connected, and the sharp blade and the guide tube are fixedly clamped between the two splints.
5. The puncture and skin cutting knife according to claim 4, characterized in that: The two splints are provided with fixing grooves for clamping the sharp blade on the opposite sides, and the size of the fixing grooves matches the size of the sharp blade; a protruding fixing block for inserting into the through hole on the sharp blade is provided in the fixing groove of one of the splints; the two splints are also provided with narrow and long arc grooves on the opposite sides, and the two arc grooves together form a through hole for the guide tube and guide wire to pass through.
6. The puncture and skin cutting knife according to claim 3, characterized in that: A reinforcement component is provided on the handle, which includes a connecting piece and a stop column. The connecting piece is vertically fixed on the handle, and the stop column is vertically fixed on the connecting piece. The stop column is located on the outside of the guide tube and fits with the side wall of the guide tube. The stop column applies external force to the guide tube to ensure that the back of the sharp blade is tightly stuck in the slot.
7. The puncture and skin cutting knife according to claim 6, characterized in that: The stop post is arranged close to the knife tip and is located at 1 / 2-1 / 3 of the distance between the knife tip and the upper end of the handle.
8. The puncture and skin cutting knife according to claim 3, characterized in that: A reinforcement component is arranged on the outer side wall of the guide tube. The reinforcement component is a fixed clamping block, and the back of the sharp blade is clamped in the fixed clamping block.
9. The puncture and skin cutting knife according to claim 8, characterized in that: The fixed clamping block is arranged at the middle and lower part of the guide tube.
10. The puncture and dermatome according to claim 1, characterized in that: The sharp blade and the guide tube are arranged front and back in parallel.