An internal fistula puncture needle

Abstract

The utility model relates to the field of medical devices, concretely relates to an internal fistula puncture needle, including needle, needle cylinder, needle wing and catheter, the needle is communicated with the catheter through the connecting piece, the needle cylinder is sleeved at the junction of needle and catheter, the number of needle wing is two, two needle wings are located on the same plane and are fixed on the outside of needle cylinder respectively, the outer wall of needle is fixed with the locating cylinder, the outer wall of locating cylinder is fixed with a pressing piece, the recess is equipped on the locating cylinder, the first spring is equipped in the recess, the outer end of first spring is articulated with the bottom surface of pressing piece, the clamping groove is equipped on the needle cylinder, and the pressing piece is matched with the clamping groove. The utility model discloses an internal fistula puncture needle, after completing dialysis, the needle of puncture needle can be hidden to prevent the sharp part of needle from causing secondary injury.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an arteriovenous fistula puncture needle. Background Technology

[0002] Autogenous arteriovenous fistulas (AVFs) are vascular access systems established for hemodialysis patients. Specifically, they anastomose the radial artery with the adjacent cephalic vein to create an arteriovenous shunt, promoting venous arterialization. Hemodialysis patients require multiple dialysis sessions per week, each requiring a puncture needle at the fistula site to drain blood from the patient's body, purify it through the dialyzer, and then return it to the patient. Current AVF puncture needles consist of a needle tip, needle wings, and a catheter. A needle cap is typically attached to the needle tip. This cap is removed before puncture, but due to its small size, it is usually discarded after dialysis when the entire needle is retrieved. This poses a risk of needle stick injuries and infection for healthcare workers during needle removal, potentially leading to serious medical accidents. Therefore, it is necessary to modify existing AVF puncture needles to prevent secondary injuries after needle removal. Utility Model Content

[0003] To address the aforementioned problems, the main objective of this invention is to provide an arteriovenous fistula puncture needle that allows the needle tip to be concealed after dialysis to prevent secondary injury from the sharp part of the needle tip.

[0004] To achieve the above objectives, this utility model provides an arteriovenous fistula puncture needle, comprising a needle tip, a syringe barrel, needle wings, and a catheter. The needle tip is connected to the catheter via a connector. The syringe barrel is sleeved at the connection between the needle tip and the catheter. There are two needle wings, which are located on the same plane and fixed to the outer side of the syringe barrel. A positioning cylinder is fixed to the outer wall of the needle tip, and a pressing member is fixed to the outer wall of the positioning cylinder. The positioning cylinder has a groove, and a first spring is provided in the groove. The outer end of the first spring is hinged to the bottom surface of the pressing member. The syringe barrel has a locking groove, and the pressing member cooperates with the locking groove.

[0005] Furthermore, one side of the beveled tip of the needle is the front side, and the pressing part and the slot are both located on the front side of the needle.

[0006] Furthermore, the pressing component consists of a fixed block and a wedge block, with the thicker end of the wedge block positioned away from the fixed block, and the fixed block and the wedge block being integrally formed.

[0007] Furthermore, the groove is located at the lower end of the wedge block, one end of the first spring is fixed in the groove, and the other end is hinged to the bottom surface of the wedge block.

[0008] Furthermore, the pressing element can deform.

[0009] Furthermore, a positioning structure is also included between the syringe and the catheter. The positioning structure includes a first ring body, a second ring body, and several second springs hinged between the first ring body and the second ring body.

[0010] Furthermore, the outer peripheral wall of the first ring is fixed to the inner wall of the syringe, the second ring includes a connecting port with a locking element, an installation ring is fixed to the outer periphery of the catheter, and the second ring is fixed to the outer wall of the installation ring by the locking element.

[0011] Furthermore, the syringe has a notch at one end near the catheter, with the outer end of the notch being open and the connection port located inside the notch.

[0012] The beneficial effects of this utility model through the above technical solution include:

[0013] (1) The connection between the needle tip and the catheter of the fistula puncture needle of this utility model is provided with a syringe. The needle tip can be fixed in the syringe by the cooperation of the pressing part and the slot. After the dialysis needle is removed, the medical staff can directly press down the pressing part and then pull the catheter away from the needle tip, and finally hide the needle tip in the syringe, which can prevent the needle tip from causing pollution or damage to the outside.

[0014] (2) In addition, the fistula puncture needle of this utility model is also provided with a positioning structure. The positioning structure can provide stable tension for the needle during use, especially with the cooperation of the pressing part and the slot, which improves the stability of the needle during use. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the fistula puncture needle of this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of the fistula puncture needle of this utility model.

[0018] Figure 3 This is the arteriovenous fistula puncture needle of this utility model. Figure 2 Enlarged view of the structure of part A in the image.

[0019] Figure 4 This is the arteriovenous fistula puncture needle of this utility model. Figure 2 Enlarged view of the structure of part B in the image.

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Needle; 11. Positioning cylinder; 111. Groove; 112. First spring; 12. Pressing element; 121. Fixing block; 122. Wedge block; 13. Sharp part; 2. Syringe; 21. Slot; 22. Notch; 3. Needle wing; 4. Guide tube; 41. Mounting ring; 51. First ring body; 52. Second ring body; 521. Connecting port; 53. Second spring; 54. Locking element; 6. Connecting element. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] First Embodiment

[0024] like Figure 1 The diagram shown is a structural schematic of the fistula puncture needle of this utility model. In this embodiment, the fistula puncture needle includes a needle tip 1, a needle barrel 2, needle wings 3, and a catheter 4. Additionally, as shown... Figure 2 As shown, the needle 1 is connected to the catheter 4 via the connector 6. The syringe 2 is fitted at the connection between the needle 1 and the catheter 4, with the tail of the needle 1 located inside the syringe 2 and the end of the catheter 4 located inside the syringe 2. The connector 6 is located inside the syringe 2. In addition, there are two needle wings 3, which are located on the same plane and fixed to the outer side of the syringe 2. The side of the bevel of the sharp part 13 of the needle 1 is defined as the front side, and the plane on which the needle wings 3 are located is parallel to the front side.

[0025] Please see Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, a positioning cylinder 11 is fixed to the outer wall of the needle 1, and a pressing member 12 is fixed to the outer wall of the positioning cylinder 11. The positioning cylinder 11 is provided with a groove 111, and a first spring 112 is provided in the groove 111. The outer end of the first spring 112 is hinged to the bottom surface of the pressing member 12. The syringe 2 is provided with a slot 21, and the pressing member 12 cooperates with the slot 21. Both the pressing member 12 and the slot 21 are located on the front side of the needle 1.

[0026] Specifically, such as Figure 3As shown, the pressing member 12 in this embodiment can be composed of a fixing block 121 and a wedge block 122. The fixing block 121 and the wedge block 122 are integrally formed. The thicker end of the wedge block 122 is set away from the fixing block 121. The groove 111 is located below the wedge block 122. One end of the first spring 112 is fixed in the groove 111, and the other end is hinged to the bottom surface of the wedge block 122. It should be noted that the pressing member 12 can be deformed. Its structure is made of a material with a certain hardness but can be deformed, such as polyethylene, polypropylene or ABS resin.

[0027] In this embodiment, after dialysis, the medical staff removes the fistula puncture needle from the patient's body and directly presses the pressing member 12. Since the pressing member 12 is locked in the slot 21, the wedge-shaped block 122 of the pressing member 12 engages with one side of the slot 21. With external pressure, the first spring 112 at the bottom of the wedge-shaped block 122 is compressed into the groove 111, and then the higher end of the wedge-shaped block 122 retracts into the slot 21. Then, the medical staff pulls the catheter 4 away from the syringe 2. Continue until the needle 1 is inside the syringe 2, thus hiding the needle 1. Then, the entire puncture needle structure can be retrieved, preventing the needle 1 from causing contamination or injury. The operation is simple, and a medical staff member can complete the above operation. In addition, it should be noted that the pressing member 12 in this embodiment requires a certain amount of pressing force to press down the first spring 112 below it. It will not be deformed due to unintentional external force, so there is no need to consider that other external forces will affect the use.

[0028] Second Embodiment

[0029] Please see Figure 2 and Figure 4 As shown, the difference between the second embodiment of this utility model and the above embodiment is that a positioning structure is provided between the syringe 2 and the catheter 4 in this embodiment. The positioning structure includes a first ring 51, a second ring 52 and several second springs 53. These second springs 53 are hinged between the first ring 51 and the second ring 52. The outer peripheral wall of the first ring 51 is fixed to the inner wall of the syringe 2, and the inner diameter of the first ring 51 is much larger than the outer diameter of the catheter 4. The second ring 52 is provided with a connection port 521, and a locking member 54 is provided on the connection port 521. An installation ring 41 is fixed to the outer periphery of the catheter 4. The second ring 52 is fixed to the outer wall of the installation ring 41 by the locking member 54. The inner diameter of the first ring 51 is also larger than the outer diameter of the installation ring 41. Therefore, the first ring 51 is only fixedly connected to the syringe 2 and hinged to the second springs 53, and has no connection with other structures.

[0030] Other examples Figure 2As shown, the syringe 2 has a notch 22 at one end near the catheter 4. The outer end of the notch 22 is open, and the connection port 521 is located inside the notch 22. In this embodiment, during use, in addition to using the pressing member 12 and the slot 21 in the first embodiment to fix the needle 1 inside and outside the syringe 2, the catheter 4 is also fixed inside the syringe 2 using a positioning structure. The two work together to make the needle 1 more stable. Specifically, the second ring 52 is fixed to the outer wall of the catheter 4 by the locking member 54. When the needle 1 needs to be fixed during use, the needle 1 moves away from the syringe 2, and at the same time, the catheter 4 also moves in the same direction. Since the first ring 51 is fixed... The second spring 53, fixed to the inner wall of the syringe 2, is stretched between the first ring 51 and the second ring 52. As the wedge block 122 of the pressing member 12 is engaged in the slot 21, the second spring 53 is no longer stretched, but the elastic force it provides makes the wedge block 122 more stably located in the slot 21. After dialysis is completed and the puncture needle is pulled out, the higher end of the wedge block 122 is pressed. Without the medical staff having to pull the catheter 4 to the rear side, the second spring 53 releases its elastic potential energy, and the needle 1 can then be hidden in the syringe 2.

[0031] The beneficial effects of this utility model through the above technical solution include:

[0032] (1) The connection between the needle tip 1 and the catheter 4 of the fistula puncture needle of this utility model is provided with a syringe 2. The syringe 2 can fix the needle tip 1 inside the syringe 2 through the cooperation of the pressing member 12 and the slot 21. After the dialysis needle is removed, the medical staff can directly press down the pressing member 12 and then pull the catheter 4 away from the needle tip 1, and finally hide the needle tip 1 inside the syringe 2, which can prevent the needle tip 1 from causing pollution or damage to the outside.

[0033] (2) In addition, the fistula puncture needle of this utility model is also provided with a positioning structure. The positioning structure can provide stable tension for the needle 1 during use, especially with the cooperation of the pressing member 12 and the slot 21, to improve the stability of the needle 1 during use.

[0034] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. An arteriovenous fistula puncture needle, characterized in that, The device includes a needle (1), a syringe (2), needle wings (3), and a catheter (4). The needle (1) is connected to the catheter (4) via a connector (6). The syringe (2) is fitted onto the connection between the needle (1) and the catheter (4). There are two needle wings (3), which are located on the same plane and are respectively fixed to the outer side of the syringe (2). A positioning cylinder (11) is fixed to the outer wall of the needle (1). A pressing member (12) is fixed to the outer wall of the positioning cylinder (11). The positioning cylinder (11) has a groove (111). A first spring (112) is provided in the groove (111). The outer end of the first spring (112) is hinged to the bottom surface of the pressing member (12). The syringe (2) has a slot (21), and the pressing member (12) cooperates with the slot (21).

2. The fistula puncture needle according to claim 1, characterized in that, The sharp part (13) of the needle (1) has one side of its bevel as the front, and the pressing member (12) and the slot (21) are both located on the front of the needle (1).

3. The fistula puncture needle according to claim 1, characterized in that, The pressing component (12) is composed of a fixing block (121) and a wedge block (122). The thicker end of the wedge block (122) is located away from the fixing block (121). The fixing block (121) and the wedge block (122) are integrally formed.

4. The fistula puncture needle according to claim 3, characterized in that, The groove (111) is located at the lower end of the wedge block (122). One end of the first spring (112) is fixed in the groove (111), and the other end is hinged to the bottom surface of the wedge block (122).

5. The fistula puncture needle according to any one of claims 1 to 4, characterized in that, The pressing element (12) can deform.

6. The fistula puncture needle according to claim 1, characterized in that, The syringe (2) and the catheter (4) also include a positioning structure, which includes a first ring (51), a second ring (52) and a plurality of second springs (53) hinged between the first ring (51) and the second ring (52).

7. The arteriovenous fistula puncture needle according to claim 6, characterized in that, The outer peripheral wall of the first ring body (51) is fixed on the inner wall of the syringe (2). The second ring body (52) includes a connecting port (521), and a locking member (54) is provided on the connecting port (521). An installation ring (41) is fixed on the outer periphery of the catheter (4). The second ring body (52) is fixed on the outer wall of the installation ring (41) by the locking member (54).

8. The fistula puncture needle according to claim 7, characterized in that, The syringe (2) has a notch (22) at one end near the catheter (4), the outer end of the notch (22) is open, and the connection port (521) is located inside the notch (22).

Images