Cannula puncture needle fixing device and cannula puncture needle system

Abstract

The utility model discloses a cannula puncture needle fixing device and a cannula puncture needle system. The cannula puncture needle fixing device comprises a first fixing seat and a second fixing seat, and a first fixing part and a second fixing part which are oppositely arranged are arranged on the first fixing seat and the second fixing seat respectively. The first fixing part is provided with a first pressing face deviating from the direction of the second fixing part, the second fixing part is provided with a second pressing face deviating from the direction of the first fixing part, and the two pressing faces are oppositely arranged. An elastic piece is arranged between the first fixing base and the second fixing base, the puncture needle tube is located between the two pressing faces, and the elastic piece is used for providing elastic force so that the first pressing face and the second pressing face can press and fix the puncture needle tube.

Description

Technical Field

[0001] The utility model belongs to the technical field of cannula puncture needles, and in particular relates to a cannula puncture needle fixing device and a cannula puncture needle system. Background Art

[0002] A cannula puncture needle is a medical device that is usually used in various surgeries that require puncture or interventional surgeries that establish a channel through puncture to facilitate subsequent operations, such as blood collection, gas and liquid delivery and gas and liquid guidance within tissues, tissue biopsy, subcutaneous tunneling, radiofrequency ablation, etc.

[0003] Usually the cannula puncture needle consists of two parts, namely the puncture needle tube and the liner (such as Figure 1 During the puncture process, the liner is placed inside the puncture needle tube to block the lumen, preventing human tissue from entering the needle tube and blocking the lumen. After the puncture needle reaches the preset position, the liner is removed, and the puncture needle tube is used to perform the aforementioned intended functions, such as liquid delivery, tissue collection, and radiofrequency energy release channel.

[0004] After the cannula punctures the intended tissue, the liner is removed and the accompanying instrument assembly is secured to the puncture needle for the next surgical procedure. Due to the smooth outer wall of the puncture needle, there is a risk of the needle moving at varying insertion depths and angles, even dislodging or puncturing a non-treatment area. This not only increases the difficulty of the procedure but also poses significant risks to the patient. Utility Model Content

[0005] In view of the above problems, the present invention provides a cannula puncture needle fixing device and a cannula puncture needle system.

[0006] The technical solution of the utility model is:

[0007] A trocar puncture needle fixing device comprises a first fixing seat and a second fixing seat, wherein the first fixing seat is provided with a first fixing portion, the second fixing seat is provided with a second fixing portion, and the first fixing portion and the second fixing portion are arranged opposite to each other; the first fixing portion is provided with a first pressing surface facing away from the second fixing portion, and the second fixing portion is provided with a second pressing surface facing away from the first fixing portion, and the first pressing surface and the second pressing surface are arranged opposite to each other;

[0008] An elastic member is provided between the first fixing seat and the second fixing seat, and when in use, the puncture needle tube of the cannula puncture needle is located between the first pressing surface and the second pressing surface, and the elastic member is used to provide elastic force to enable the first pressing surface and the second pressing surface to press the puncture needle tube of the cannula puncture needle;

[0009] The first fixing seat and the second fixing seat are both provided with a connecting portion, and the connecting portion is used to connect to the puncture object.

[0010] In a preferred embodiment of the trocar puncture needle fixing device, the first fixing seat includes a first fixing seat body and the first fixing portion, the first fixing portion includes a first fixing plate, the first fixing plate is connected to the first fixing seat body with a distance therebetween; the surface of the first fixing plate facing the first fixing seat body is the first pressing surface;

[0011] The second fixing seat includes a second fixing seat body and a second fixing portion. The second fixing portion includes a second fixing plate. The second fixing plate is connected to the second fixing seat body. The surface of the second fixing plate facing the second fixing seat body is the second pressing surface.

[0012] The first fixing plate is provided with a through hole, and the second fixing plate reaches the spacing space between the first fixing plate and the first fixing seat body through the through hole, so that the first pressing surface and the second pressing surface are arranged to face each other.

[0013] In the trocar puncture needle fixing device provided in a preferred embodiment, two ends of the elastic member abut against the first fixing seat body and the second fixing plate respectively.

[0014] In a preferred embodiment of the cannula puncture needle fixing device, the first pressing surface and the second pressing surface are both elastic. When the puncture needle tube of the cannula puncture needle is pressed between the first pressing surface and the second pressing surface, the first pressing surface and the second pressing surface are elastically deformed to adapt to the shape of the puncture needle tube of the cannula puncture needle.

[0015] In a preferred embodiment of the trocar puncture needle fixing device, a first guide groove is provided on the first fixing seat body, and the first end of the elastic member extends into the first guide groove and abuts against the bottom surface of the first guide groove;

[0016] And / or, an annular structure is protruded on the surface of the second fixing plate facing the first fixing seat, and the annular structure and the surface of the second fixing plate inside it facing the first fixing seat cooperate to form the second guide groove, and the second end of the elastic member extends into the second guide groove and abuts against the bottom surface of the second guide groove.

[0017] In the cannula puncture needle fixing device provided in a preferred embodiment, a limiting structure is provided between the first fixing plate and the second fixing plate, and the limiting structure is used to prevent the second fixing plate from exiting the spacing space through the through hole.

[0018] In the trocar puncture needle fixing device provided in a preferred embodiment, the limiting structure includes a buckle and a buckling portion;

[0019] The buckle is provided on the side surfaces around the second fixing plate, and the buckling portion is provided on the first fixing plate on the circumferential outside of the through hole; when there is no puncture needle tube of the cannula puncture needle between the first pressing surface and the second pressing surface, the surface of the buckle facing the second fixing seat body abuts against the surface of the buckling portion facing the first fixing seat body under the elastic force of the elastic member, so as to prevent the second fixing plate from withdrawing from the through hole into the spacing space.

[0020] In a cannula puncture needle fixing device provided in a preferred embodiment, a guide member is provided on the side of the first fixing plate facing the second fixing seat, and a third guide groove is provided on the side of the second fixing seat body facing the first fixing seat. The guide member extends into the third guide groove and can be slidably connected to the third guide groove along the groove depth direction of the third guide groove.

[0021] In a cannula puncture needle fixing device provided in a preferred embodiment, a first pressing portion is provided on the side of the first fixing seat body facing away from the second fixing seat, a second pressing portion is provided on the side of the second fixing seat body facing away from the first fixing seat, and the elastic member is provided between the first pressing portion and the second pressing portion, and the first pressing portion and the second pressing portion cooperate with each other to receive external force, and the external force is used to overcome the elastic resistance of the elastic member to move the first pressing surface and the second pressing surface away from each other.

[0022] In a preferred embodiment of the cannula puncture needle fixing device, the connecting portion includes a receiving groove provided on the first fixing seat / the second fixing seat and an adhesive member provided in the receiving groove, and the adhesive member has an adhesive force capable of adhering and fastening to an external object.

[0023] A trocar puncture needle system, comprising a trocar puncture needle and a trocar puncture needle fixing device as described in any one of the above;

[0024] The outer wall of the puncture needle tube of the cannula puncture needle is provided with a scale for displaying the puncture depth.

[0025] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0026] The present invention provides a cannula puncture needle fixing device and cannula puncture needle system. When the cannula puncture needle is in use, the puncture needle tube is located between the first pressing surface and the second pressing surface. By applying an external force to overcome the elastic resistance of the elastic member, a sufficient gap can be created between the first pressing surface and the second pressing surface so that the puncture needle tube therein can be inserted to a depth and an angle. When the puncture needle reaches a preset position, that is, after puncture is completed, the first fixing seat and the second fixing seat are connected to the puncture object through the connecting portion, so that the first fixing seat and the second fixing seat and the puncture object maintain a constant relative position. Then, the external force that overcomes the elastic resistance of the elastic member is removed, so that the elastic member drives the first pressing surface and the second pressing surface to move toward each other until the first pressing surface and the second pressing surface compress and fix the puncture needle tube. In this way, during the subsequent removal of the liner and subsequent work, the relative position of the puncture needle tube of the puncture needle and the puncture object remains unchanged, thereby solving the problem in the prior art that the puncture needle tube is easily moved or even dislodged or penetrates a non-treatment area. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those skilled in the art. The accompanying drawings are only for illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0028] Figure 1 It is a structural schematic diagram of a puncture trocar;

[0029] Figure 2 and Figure 3 This is a schematic diagram of a cannula puncture needle fixing device of the present invention holding a cannula puncture needle;

[0030] Figure 4 and Figure 5 This is a structural diagram of a cannula puncture needle system of the present invention;

[0031] Figure 6 This is a structural diagram of a cannula puncture needle fixing device of the present invention;

[0032] Figure 7 This is a schematic diagram of a trocar puncture needle fixing device according to the present invention when the first fixing seat and the second fixing seat are separated;

[0033] Figure 8 This is a schematic diagram of a trocar puncture needle fixing device according to the present invention when the first fixing seat and the second fixing seat are assembled together;

[0034] Figure 9 This is a schematic diagram of a trocar puncture needle fixing device according to the present invention, wherein the first fixing seat and the second fixing seat are clamped with the puncture needle tube;

[0035] Figure 10 This is a schematic diagram of the installation of a cannula puncture needle fixing device of the present invention (the gray area indicated by a is the contact area between the puncture needle tube and the first pressing surface / second pressing surface);

[0036] Figure 11 This is a schematic diagram of the insertion angle control of the puncture needle tube of a cannula puncture needle fixing device of the present invention;

[0037] Figure 12 This is a schematic diagram of the range of motion of a trocar puncture needle and a trocar puncture needle fixing device according to the present invention;

[0038] Figure 13 The figure is a structural diagram of a cannula puncture needle of the present utility model.

[0039] Description of reference numerals:

[0040] First fixing seat 1, first fixing seat body 11, first guide groove 111, first pressing portion 112, first fixing portion 12, first fixing plate 121, first pressing surface 1211, through hole 1212, buckling portion 1213, guide member 122, spacing space 13;

[0041] Second fixing seat 2, second fixing seat body 21, second pressing portion 211, third guide groove 212, second fixing portion 22, second fixing plate 221, second pressing surface 2211, annular structure 222, buckle 223;

[0042] Connecting portion 3, receiving groove 31, adhesive member 32;

[0043] Elastic member 4;

[0044] Trocar puncture needle 5, puncture needle tube 51, scale 511, liner core 52. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0046] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0047] Example 1

[0048] See Figures 1 to 12 This embodiment provides a trocar puncture needle fixing device, comprising a first fixing seat 1 and a second fixing seat 2. The first fixing seat 1 is provided with a first fixing portion 12, and the second fixing seat 2 is provided with a second fixing portion 22, with the first fixing portion 12 and the second fixing portion 22 being disposed opposite each other. The first fixing portion 12 is provided with a first pressing surface 1211 facing away from the second fixing portion 22, and the second fixing portion 22 is provided with a second pressing surface 2211 facing away from the first fixing portion 12, with the first pressing surface 1211 and the second pressing surface 2211 facing each other.

[0049] An elastic member 4 is disposed between the first fixing seat 1 and the second fixing seat 2. During use, the puncture needle tube 51 of the cannula puncture needle 5 is positioned between the first pressing surface 1211 and the second pressing surface 2211. The elastic member 4 is used to provide an elastic force to compress the first and second pressing surfaces 1211, 2211 against the puncture needle tube 51 of the cannula puncture needle 5. When an external force is applied to overcome the elastic force of the elastic member 4, so that the first and second pressing surfaces 1211, 2211 no longer compress the puncture needle tube 51, the puncture needle tube 51 can adjust its insertion depth and angle.

[0050] The first fixing seat 1 and the second fixing seat 2 are both provided with a connecting portion 3 for connecting to a puncture object.

[0051] When the cannula puncture needle fixing device provided in this embodiment is in use, the puncture needle tube 51 of the cannula puncture needle 5 is located between the first pressing surface 1211 and the second pressing surface 2211. By applying external force to overcome the elastic resistance of the elastic member 4, a sufficient gap can be provided between the first pressing surface 1211 and the second pressing surface 2211 so that the puncture needle tube 51 therein can be inserted into the preset position and the insertion angle. When the puncture cannula needle reaches the preset position, that is, after the puncture is in place, the first fixing seat 1 and the second fixing seat 2 are connected to the puncture object (generally human skin) through the connecting portion 3, so that the first fixing seat 1 and the second fixing seat 2 maintain the relative position unchanged with the puncture object, and then the external force to overcome the elastic resistance of the elastic member 4 is cancelled, so that the elastic member 4 drives the first pressing surface 1211 and the second pressing surface 2211 to move toward each other until the first pressing surface 1211 and the second pressing surface 2211 press and fix the puncture needle tube 51. In this way, during the subsequent process of removing the liner core 52 and performing subsequent work, the relative position of the puncture needle tube 51 of the puncture trocar and the puncture object remains unchanged.

[0052] The following is a further description of the cannula puncture needle fixing device of this embodiment.

[0053] like Figure 4 and Figure 6 As shown, the first fixing seat 1 includes a first fixing seat body 11 and the above-mentioned first fixing portion 12. The first fixing portion 12 includes a first fixing plate 121 and a guide member 122. The first fixing plate 121 is connected to the first fixing seat body 11 and there is a gap between the first fixing plate 121 and the first fixing seat body 11. The space (or gap) occupied by the gap between the first fixing plate 121 and the first fixing seat body 11 is referred to as the spacing space 13. The first fixing plate 121 is the component in the first fixing portion 12 that is provided with the first pressing surface 1211. The surface of the first fixing plate 121 facing the first fixing seat body 11 is the first pressing surface 1211.

[0054] The second fixing base 2 includes a second fixing base body 21 and the aforementioned second fixing portion 22. The second fixing portion 22 includes a second fixing plate 221, an annular structure 222, and a buckle 223. The second fixing plate 221 is connected to the second fixing base body 21. The second fixing plate 221 is the component of the second fixing portion 22 that is provided with a second pressing surface 2211. The surface of the second fixing plate 221 that faces the second fixing base body 21 is the second pressing surface 2211.

[0055] The first fixing plate 121 is provided with a through hole 1212 , and the second fixing plate 221 reaches the spacing space 13 between the first fixing plate 121 and the first fixing seat body 11 through the through hole 1212 , so that the first pressing surface 1211 and the second pressing surface 2211 are arranged facing each other.

[0056] The two ends of the elastic member 4 respectively abut against the first fixed seat body 11 and the second fixed plate 221. Preferably, in this embodiment, the elastic member 4 can be a spring. The two ends of the elastic member 4 are the first end and the second end of the elastic member 4 respectively. Furthermore, a first guide groove 111 is provided on the first fixed seat body 11, and the first end of the elastic member 4 extends into the first guide groove 111 and abuts against the bottom surface of the first guide groove 111; the above-mentioned annular structure 222 is convexly provided on the surface of the second fixed plate 221 facing the first fixed seat 1, and the annular structure 222 and the surface of the second fixed plate 221 inside it facing the first fixed seat 1 cooperate to form a second guide groove, and the second end of the elastic member 4 extends into the second guide groove and abuts against the bottom surface of the second guide groove.

[0057] A retaining structure is provided between the first fixing plate 121 and the second fixing plate 221. This retaining structure prevents the second fixing plate 221 from exiting the spacing space 13 through the through-hole 1212. Specifically, in this embodiment, the retaining structure includes the aforementioned buckle 223 and the snap-fit ​​portion 1213. The buckle 223 is provided on the sides of the second fixing plate 221, while the snap-fit ​​portion 1213 is provided on the first fixing plate 121, circumferentially outside the through-hole 1212 (actually, the snap-fit ​​portion 1213 is part of the first fixing plate 121). When the puncture needle tube 51 of the cannula puncture needle 5 is not positioned between the first pressing surface 1211 and the second pressing surface 2211 (i.e., in the non-operating state), the surface of the buckle 223 facing the second fixing seat body 21 abuts against the surface of the fastening portion 1213 facing the first fixing seat body 11 (the surface of the fastening portion 1213 facing the first fixing seat body 11 is actually a portion of the second pressing surface 2211) under the elastic force of the elastic member 4, thereby preventing the second fixing plate 221 from exiting the spacing space 13 through the through hole 1212, thereby preventing the first fixing seat 1 and the second fixing seat 2 from separating. The buckle 223 is elastic, and when the second fixing plate 221 needs to pass through the through hole 1212 to enter the spacing space 13 between the first fixing plate 221 and the first fixing seat body 11, the buckle 223 can be elastically deformed to pass through the through hole 1212 and into the spacing space 13 between the first pressing surface 1211 and the first fixing seat body 11. The buckle 223 is preferably integrally formed with the second fixing plate 221. Of course, in other embodiments, other structures may be used to prevent the first fixing base 1 and the second fixing base 2 from separating, and the present invention is not limited thereto.

[0058] A first pressing portion 112 is provided on the side of the first fixing seat body 11 facing away from the second fixing seat 2, and a second pressing portion 211 is provided on the side of the second fixing seat body 21 facing away from the first fixing seat 1, and the elastic member 4 is provided between the first pressing portion 112 and the second pressing portion 211. Specifically, the first pressing portion 112 is a depression on the first fixing seat body 11 suitable for pressing with a finger, and the second pressing portion 211 is a depression on the second fixing seat body 21 suitable for pressing with a finger. The first pressing portion 112 and the second pressing portion 211 cooperate with each other to receive an external force, which is used to overcome the elastic resistance of the elastic member 4 to move the first pressing surface 1211 and the second pressing surface 2211 away from each other.

[0059] In some preferred embodiments, the first pressing surface 1211 and the second pressing surface 2211 are both elastic. When the puncture needle tube 51 of the cannula puncture needle 5 is pressed between the first pressing surface 1211 and the second pressing surface 2211, the first pressing surface 1211 and the second pressing surface 2211 can undergo slight elastic deformation, thereby being able to adapt to the shape of the compressed puncture needle tube 51, increase the contact area between the first pressing surface 1211 and the second pressing surface 2211 and the puncture needle tube 51, and increase the stability of the first pressing surface 1211 and the second pressing surface 2211 in pressing the puncture needle tube 51.

[0060] Preferably, the guide member 122 is provided on the side of the first fixing plate 121 facing the second fixing seat 2, and a third guide groove 212 is provided on the side of the second fixing seat body 21 facing the first fixing seat 1. The guide member 122 extends into the third guide groove 212 and is slidably connected to the third guide groove 212 along the depth direction of the third guide groove 212. The provision of the guide member 122 and the third guide groove 212 enables the first fixing plate 121 and the second fixing plate 221 to move along a predetermined trajectory when moving toward or away from each other under the elastic force of the elastic member 4 and an external force.

[0061] The connecting portion 3 includes a receiving groove 31 provided on the first fixing seat 1 / second fixing seat 2 and an adhesive member 32 provided in the receiving groove 31. The adhesive member 32 has an adhesive force that allows it to adhere and securely adhere to external objects. Preferably, in this embodiment, the adhesive member 32 is a sticky silicone patch, which is fixed in the corresponding receiving groove 31. When the first fixing seat 1 / second fixing seat 2 is pressed against the human body, so that the silicone patch is attached to the surface of the human skin, the stickiness of the surface of the silicone patch causes it to adhere and secure to the surface of the human skin, thereby fixing the first fixing seat 1 / second fixing seat 2 to the surface of the human skin. When it is necessary to separate the first fixing seat 1 / second fixing seat 2 from the human body, it is only necessary to forcefully pull up the first fixing seat 1 / second fixing seat 2 to separate the silicone patch from the surface of the human skin.

[0062] The cannula puncture needle fixing device provided in this embodiment can lock the relative position of the puncture needle tube 51 of the cannula puncture needle 5, and then fix the relative position of the puncture needle tube 51 and the surface of the human skin by means of the adhesive silicone patch. When in use, the locking state can be quickly released by pressing the first pressing portion 112 and the second pressing portion 211, and then the insertion depth and insertion angle of the puncture needle tube 51 can be adjusted. When the puncture needle tube 51 reaches the preset position, the adhesive surface of the silicone patch is tightly attached to the human skin and the pressing of the first pressing portion 112 and the second pressing portion 211 is stopped, so that the cannula puncture needle fixing device can use the elasticity of the elastic member 4 and the first fixing portion 12 and the second fixing portion 22 to press and fix the puncture needle tube 51, thereby achieving the fixation of the insertion angle and insertion depth.

[0063] Example 2

[0064] See Figures 1 to 13 This embodiment provides a cannula puncture needle system, including a cannula puncture needle 5 and a cannula puncture needle fixing device as shown in Example 1; a scale 511 for displaying the puncture depth is provided on the outer wall of the puncture needle tube 51 of the cannula puncture needle 5.

[0065] Existing radiofrequency cannula puncture needles have a black insulating coating on the surface and no scale information, making it impossible to know the puncture depth during the puncture process, causing inconvenience to the operator. To solve this problem, this embodiment improves and optimizes the insulating coating material and adds scale lines.

[0066] The insulating coating of the puncture needle tube 51 of the cannula puncture needle 5 of this embodiment is made of a transparent material, which is not limited to polyethylene terephthalate, polyurethane, polyimide, etc. Laser printing (or electrochemical etching, engraving, etc.) of scale lines with a spacing of 10 mm is performed on the metal tube or insulating coating surface of the puncture needle tube 51, such as Figure 13 As shown; of course, there are many ways to mark, and the interval between scale lines can also be adjusted according to actual conditions, which is not limited here.

[0067] The setting of the scale 511 on the puncture needle tube 51 of the cannula puncture needle 5 can facilitate the operator to judge the puncture depth.

[0068] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they will still fall within the scope of protection of the present invention.

Claims

1. A cannula puncture needle fixing device, characterized in that: The invention comprises a first fixing seat and a second fixing seat, wherein the first fixing seat is provided with a first fixing portion, the second fixing seat is provided with a second fixing portion, and the first fixing portion and the second fixing portion are arranged facing each other; the first fixing portion is provided with a first pressing surface facing away from the second fixing portion, and the second fixing portion is provided with a second pressing surface facing away from the first fixing portion, and the first pressing surface and the second pressing surface are arranged facing each other; An elastic member is provided between the first fixing seat and the second fixing seat, and when in use, the puncture needle tube of the cannula puncture needle is located between the first pressing surface and the second pressing surface, and the elastic member is used to provide elastic force to enable the first pressing surface and the second pressing surface to press the puncture needle tube of the cannula puncture needle; The first fixing seat and the second fixing seat are both provided with a connecting portion, and the connecting portion is used to connect to the puncture object.

2. The trocar puncture needle fixing device according to claim 1, characterized in that: The first fixing seat includes a first fixing seat body and the first fixing portion. The first fixing portion includes a first fixing plate. The first fixing plate is connected to the first fixing seat body with a distance therebetween. The surface of the first fixing plate facing the first fixing seat body is the first pressing surface. The second fixing seat includes a second fixing seat body and a second fixing portion. The second fixing portion includes a second fixing plate. The second fixing plate is connected to the second fixing seat body. The surface of the second fixing plate facing the second fixing seat body is the second pressing surface. The first fixing plate is provided with a through hole, and the second fixing plate reaches the spacing space between the first fixing plate and the first fixing seat body through the through hole, so that the first pressing surface and the second pressing surface are arranged to face each other.

3. The trocar puncture needle fixing device according to claim 2, characterized in that: The first pressing surface and the second pressing surface are both elastic. When the puncture needle tube of the cannula puncture needle is pressed between the first pressing surface and the second pressing surface, the first pressing surface and the second pressing surface are elastically deformed to adapt to the shape of the puncture needle tube of the cannula puncture needle.

4. The trocar puncture needle fixing device according to claim 2, characterized in that: Two ends of the elastic member respectively abut against the first fixing seat body and the second fixing plate.

5. The trocar puncture needle fixing device according to claim 4, characterized in that: A first guide groove is provided on the first fixing seat body, and the first end of the elastic member extends into the first guide groove and abuts against the bottom surface of the first guide groove; And / or, an annular structure is protruded on the surface of the second fixing plate facing the first fixing seat, and the annular structure and the surface of the second fixing plate inside it facing the first fixing seat cooperate to form a second guide groove, and the second end of the elastic member extends into the second guide groove and abuts against the bottom surface of the second guide groove.

6. The trocar puncture needle fixing device according to claim 2, characterized in that: A limiting structure is provided between the first fixing plate and the second fixing plate, and the limiting structure is used to prevent the second fixing plate from exiting the spacing space through the through hole.

7. The trocar puncture needle fixing device according to claim 6, characterized in that: The limiting structure includes a buckle and a buckling portion; The buckle is provided on the side surfaces around the second fixing plate, and the buckling portion is provided on the first fixing plate on the circumferential outside of the through hole; when there is no puncture needle tube of the cannula puncture needle between the first pressing surface and the second pressing surface, the surface of the buckle facing the second fixing seat body abuts against the surface of the buckling portion facing the first fixing seat body under the elastic force of the elastic member, so as to prevent the second fixing plate from withdrawing from the through hole into the spacing space.

8. The trocar puncture needle fixing device according to claim 2 or 4, characterized in that: A guide member is provided on the side of the first fixing plate facing the second fixing seat, and a third guide groove is provided on the side of the second fixing seat body facing the first fixing seat. The guide member extends into the third guide groove and can be slidably connected to the third guide groove along the groove depth direction of the third guide groove.

9. The trocar puncture needle fixing device according to claim 4, characterized in that: A first pressing portion is provided on the side of the first fixing seat body facing away from the second fixing seat, and a second pressing portion is provided on the side of the second fixing seat body facing away from the first fixing seat, and the elastic member is provided between the first pressing portion and the second pressing portion, and the first pressing portion and the second pressing portion cooperate with each other to receive external force, and the external force is used to overcome the elastic resistance of the elastic member to make the first pressing surface and the second pressing surface move away from each other.

10. The trocar puncture needle fixing device according to claim 1, characterized in that: The connecting portion includes a receiving groove provided on the first fixing seat / the second fixing seat and an adhesive member provided in the receiving groove, and the adhesive member has an adhesive force capable of adhering to and fastening to an external object.

11. A cannula puncture needle system, characterized in that: It comprises a trocar puncture needle and a trocar puncture needle fixing device according to any one of claims 1 to 10; The outer wall of the puncture needle tube of the cannula puncture needle is provided with a scale for displaying the puncture depth.

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