Medical needle assembly

Abstract

A medical needle assembly (10) is provided with a needle cover member (16) capable of covering a needle tip (122) of a needle body (12). The needle cover member (16) is provided with a liquid absorbing portion (22) disposed further toward the distal end than the needle tip (122) of the needle body (12) in a state in which the needle body (12) is accommodated in a cover lumen (162). The liquid absorbing portion (22) is formed from a swellable material. When the liquid absorbing portion (22) expands, the opening area of the cover lumen (162) further toward the distal end than the needle tip (122) decreases.

Description

Medical needle assembly

[0001] The present disclosure relates to a medical needle assembly.

[0002] Japanese Patent No. 7190118 discloses a medical needle assembly provided with a protector. The medical needle assembly includes a needle, a needle hub connected to a proximal end of the needle, and a cylindrical protector mounted on the needle and covering an outer side of the needle. When using the medical needle assembly, the needle covered by the protector is relatively moved in a distal direction to puncture a living body with the needle tip of the needle, and a drug solution or the like is administered into the living body through the needle. When withdrawing the needle left in the living body after completion of the drug solution administration, the needle is relatively moved in a proximal direction relative to the protector, whereby the needle is accommodated and covered inside the protector. Further, when blood is collected by the medical needle assembly, after the needle is left in the living body, blood is sucked by a collection instrument connected to a proximal end portion of the needle hub.

[0003] Japanese Patent No. 7190118

[0004] In the above-described medical needle assembly, when the indwelled needle is accommodated in the protector, there is a possibility that the drug solution or blood remaining inside the needle leaks from the needle tip through the distal end of the protector.

[0005] An object of the present disclosure is to solve the above-mentioned problems.

[0006] (1) An aspect of the present disclosure is a medical needle assembly including: a hollow needle body; a needle hub connected to a proximal end portion of the needle body; and a needle cover member capable of covering at least a needle tip of the needle body by relatively moving in a distal direction relative to the needle body, wherein the needle cover member includes: a cover inner cavity formed inside a peripheral wall portion and capable of accommodating the needle body; and a liquid absorbing portion provided on the peripheral wall portion and arranged in the distal direction from the needle tip of the needle body in a state where the needle body is accommodated in the cover inner cavity, the liquid absorbing portion is formed of a swelling material, and when the liquid absorbing portion expands, an opening area of the cover inner cavity in the distal direction from the needle tip becomes smaller.

[0007] According to this medical needle assembly, by accommodating the needle body punctured into a living body in the needle cover member, the liquid absorbing portion is expanded, thereby effectively suppressing leakage of liquid from the cover inner cavity to the outside.

[0008] (2) In the medical needle assembly described in (1) above, either the needle body or the needle hub may be provided with a sealing portion that is positioned in the proximal direction from the needle tip of the needle body and seals the lumen of the cover.

[0009] This configuration allows the cover lumen to be sealed by the liquid absorption section and the sealing section, more effectively preventing liquid leakage from the needle cover member to the outside.

[0010] (3) In the medical needle assembly described in (2) above, the needle cover member may have a fitting portion that is provided in the direction toward the base end from the sealing portion and fits into the needle hub.

[0011] This configuration allows the needle cover member to be effectively held against the needle hub while the cover lumen is sealed.

[0012] (4) In the medical needle assembly described in any one of (1) to (3) above, the liquid absorbent portion may be provided at the tip of the needle cover member and on the inner surface of the peripheral wall portion of the needle cover member.

[0013] This configuration effectively reduces the opening area of ​​the lumen inside the needle cover at the tip of the needle cover member.

[0014] (5) In the medical needle assembly described in any one of (1) to (4) above, the liquid absorbent portion may be in contact with the outer surface of the needle body in its initial state.

[0015] This configuration ensures that the needle body, after being inserted into a living organism, can be reliably brought into contact with the liquid absorption area.

[0016] (6) In the medical needle assembly described in (5) above, the liquid absorbent portion has an inner circumference facing the needle body, and the inner circumference may be formed in an inverse tapered shape toward the tip.

[0017] This configuration allows for effective absorption of any liquid adhering to the needle body into the inner circumference of the needle cover when the needle body is housed within the needle cover member.

[0018] (7) In the medical needle assembly described in any one of (1) to (6) above, the needle cover member may be provided with a pair of elastically deformable wing portions extending from the peripheral wall portion in a direction intersecting the axial direction.

[0019] This configuration allows for easy puncture by gripping the wing portion. The wing portion effectively maintains the needle's position.

[0020] (8) In the medical needle assembly described in (4) above, the tip of the needle cover member has a tip opening that opens in the direction of the tip and communicates with the lumen of the cover, and the tip opening may be closed when the liquid absorbent part expands.

[0021] This configuration more effectively suppresses the leakage of liquid from the tip opening of the needle cover member to the outside.

[0022] According to this disclosure, by housing the needle body that has been punctured into a living organism in the needle cover member, the liquid absorption part is expanded, effectively suppressing the leakage of liquid from the cover lumen to the outside.

[0023] Figure 1 is an overall configuration diagram of a medical needle assembly according to an embodiment of this disclosure. Figure 2 is an enlarged cross-sectional view showing the vicinity of the needle cover member of the medical needle assembly shown in Figure 1. Figure 3 is a plan view of the medical needle assembly showing the needle body housed inside the needle cover member. Figure 4 is a cross-sectional view along the line IV-IV in Figure 1. Figure 5 is an exploded configuration diagram of the medical needle assembly shown in Figure 1. Figure 6 is a first explanatory diagram showing the state of use of the medical needle assembly. Figure 7 is a second explanatory diagram showing the state of use of the medical needle assembly. Figure 8 is a third explanatory diagram showing the state of use of the medical needle assembly. Figure 9 is an enlarged cross-sectional view of a modified medical needle assembly equipped with a liquid absorbent part. Figure 10A is an overall configuration diagram of a modified medical needle assembly. Figure 10B is an explanatory diagram of the use of the medical needle assembly shown in Figure 10A.

[0024] As shown in Figure 1, the medical needle assembly 10 according to this embodiment is used, for example, when blood collection, blood transfusion, or intravenous fluid administration, by being fixed in a punctured state in the patient's skin.

[0025] The medical needle assembly 10 comprises a needle body 12, a needle hub 14, and a needle cover member 16.

[0026] As shown in Figure 2, the needle body 12 is formed in a hollow shape. The needle body 12 has a lumen 121 and a needle tip 122. The lumen 121 is formed inside the needle body 12 and extends along the axial direction. Liquid L flows through the lumen 121 (see Figure 7). The needle tip 122 is provided at the tip of the needle body 12. Before use, the needle body 12 is fitted with a protective cap (not shown), and the needle body 12 is covered by the protective cap.

[0027] The needle hub 14 is connected to the base end of the needle body 12. The needle hub 14 has a hub lumen 141 inside. The tip of the hub lumen 141 is connected to the lumen 121 of the needle body 12, so that they communicate with each other. A tube 18 for supplying liquid L is connected to the base end of the needle hub 14. The tube 18 and the hub lumen 141 communicate with each other.

[0028] The needle hub 14 has a mating portion 142. The mating portion 142 is provided on the outer circumferential surface of the needle hub 14. The mating portion 142 is provided at the tip of the needle hub 14. The mating portion 142 has a recess 20 that is recessed from the outer circumferential surface of the needle hub 14. The recess 20 is formed in an annular shape along the circumferential direction of the needle hub 14. Note that the recess 20 is not limited to being formed in an annular shape. For example, the recess 20 may be provided on a part of the circumferential direction of the needle hub 14. Multiple recesses 20 may be provided along the circumferential direction of the needle hub 14.

[0029] The needle cover member 16 is formed in a cylindrical shape. The needle cover member 16 slidably holds the needle hub 14. The needle cover member 16 is provided so as to be movable relative to the needle body 12 in the tip direction. As shown in Figure 3, the needle cover member 16 can cover at least the needle tip 122 of the needle body 12 by moving in the tip direction.

[0030] As shown in Figure 2, the needle cover member 16 comprises a peripheral wall portion 161, a cover lumen 162, and a liquid absorption portion 22. The peripheral wall portion 161 is formed in an annular shape and extends in the axial direction of the needle cover member 16.

[0031] The cover lumen 162 is formed inside the peripheral wall portion 161. The cover lumen 162 is capable of accommodating the needle body 12 (see Figure 3). As shown in Figure 3, when the needle cover member 16 moves relative to the needle body 12 in the tip direction, the needle body 12 is accommodated in the cover lumen 162 of the needle cover member 16. The needle cover member 16 is formed to accommodate at least the needle tip 122 of the needle body 12.

[0032] As shown in Figure 2, the liquid absorbent portion 22 is fixed to the inner circumferential surface of the peripheral wall portion 161. The liquid absorbent portion 22 is provided at the tip of the needle cover member 16. The inner circumferential portion 221 of the liquid absorbent portion 22 is in contact with the outer circumferential surface of the needle body 12. In this case, the liquid absorbent portion 22 and the needle body 12 are in annular contact. As shown in Figure 4, the liquid absorbent portion 22 is formed in an annular shape along the peripheral wall portion 161. The liquid absorbent portion 22 has an inner circumferential portion 221 facing the needle body 12. In the initial state, the needle body 12 is inserted into the interior of the liquid absorbent portion 22. As shown in Figure 3, when the needle body 12 is housed in the cover lumen 162, the liquid absorbent portion 22 is positioned further forward than the needle tip 122 of the needle body 12.

[0033] The liquid absorbent portion 22 is not limited to being fixed to the inner circumferential surface of the peripheral wall portion 161. For example, a plurality of sheet-like liquid absorbent portions 22 may be arranged in parallel along the circumferential direction of the peripheral wall portion 161, surrounding the outer periphery of the needle body 12. The liquid absorbent portion 22 may be in contact with or fitted to the inner circumferential surface of the peripheral wall portion 161.

[0034] The liquid absorbent portion 22 is formed from a swelling material. The swelling material is, for example, a superabsorbent polymer. Examples of superabsorbent polymers used include sodium polyacrylate crosslinked products, vinyl acetate-methyl acrylate copolymers, carboxymethylcellulose, starch-polyacrylonitrile hydrolysates, starch-polyacrylate salts, isobutylene-maleic anhydride copolymers, polyethylene oxide polymers, and the like.

[0035] As shown in Figure 6, the needle cover member 16 further comprises a tip opening 163, a fitting portion 26, and a skirt portion 28.

[0036] As shown in Figure 2, the tip opening 163 is provided at the tip of the needle cover member 16. The tip opening 163 opens towards the tip at the tip. The tip opening 163 communicates with the cover lumen 162. As shown in Figure 3, when the needle body 12 is housed in the cover lumen 162, a liquid absorption section 22 is provided between the tip opening 163 and the needle tip 122 of the needle body 12.

[0037] The fitting portion 26 is provided in a direction toward the base end than the sealing portion 24, which will be described later. The fitting portion 26 is provided so as to be able to fit onto the needle hub 14. The fitting portion 26 is provided at the base end of the needle cover member 16. The fitting portion 26 has a protrusion 30 that projects radially inward from the inner circumferential surface of the peripheral wall portion 161. The protrusion 30 is formed in an annular shape along the inner circumferential surface of the peripheral wall portion 161.

[0038] The protrusions 30 are not limited to being formed in an annular shape. For example, the protrusions 30 may be provided on a part of the circumferential wall portion 161. Multiple protrusions 30 may be provided along the circumferential direction of the circumferential wall portion 161.

[0039] As shown in Figure 3, with the needle body 12 housed in the cover lumen 162 of the needle cover member 16, the protrusion 30 is fitted into the recess 20 of the needle hub 14 (see Figure 8). The fitting portion 26 and the fitted portion 142 are fitted together, restricting the relative axial movement of the needle hub 14 and the needle body 12 and the needle cover member 16. The fitted portion 142 of the needle hub 14 may have a protrusion, and the fitting portion 26 of the needle cover member 16 may have a recess that fits into the protrusion.

[0040] Furthermore, the needle cover member 16 is not limited to having a fitting portion 26. For example, the needle cover member 16 does not need to have a fitting portion 26.

[0041] As shown in Figure 2, the skirt portion 28 is provided at the base end of the needle cover member 16. The skirt portion 28 is formed in an annular shape and is designed to expand in diameter towards the base end.

[0042] As shown in Figure 3, the needle cover member 16 further includes a wing member 32.

[0043] As shown in FIG. 4, the wing member 32 is fixed to the outer periphery of the needle cover member 16. The wing member 32 includes a hollow cylindrical portion 321 and a pair of wing portions 322. The cylindrical portion 321 covers a part of the peripheral wall 161 of the needle cover member 16. The wing member 32 is fixed to the needle cover member 16 via the cylindrical portion 321.

[0044] As shown in FIG. 3, the pair of wing portions 322 each extend from the cylindrical portion 321 in a direction orthogonal to the axial direction of the cylindrical portion 321. Each wing portion 322 is formed to be elastically deformable when gripped by a user. When a user presses each wing portion 322 toward the cylindrical portion 321 to bring them close to each other, the pair of wing portions 322 can be brought into an overlapping state in contact with each other (refer to the two-dot chain line shape in FIG. 4).

[0045] The medical needle assembly 10 further includes a sealing portion 24. The sealing portion 24 is disposed closer to the proximal end than the needle tip 122 of the needle body 12. The sealing portion 24 is provided at the distal end of the needle hub 14. It should be noted that the sealing portion 24 may alternatively be provided on the needle body 12. The sealing portion 24 is formed into an annular shape from an elastic body and is provided radially outward of the outer peripheral surface of the needle body 12. The sealing portion 24 abuts against the inner peripheral surface of the peripheral wall portion 161. When the needle body 12 and the needle hub 14 move, the sealing portion 24 is provided to be displaceable (slidable) relative to the cover inner cavity 162 of the needle cover member 16.

[0046] The sealing portion 24 seals the cover inner cavity 162. When the sealing portion 24 abuts against the inner peripheral surface of the peripheral wall portion 161, the gap between the needle body 12 and the peripheral wall portion 161 of the needle cover member 16 is sealed.

[0047] It should be noted that the medical needle assembly 10 is not limited to the configuration including the sealing portion 24. For example, the medical needle assembly 10 may not include the sealing portion 24.

[0048] The medical needle assembly 10 is used as follows. Hereinafter, a case where an infusion fluid L1 (liquid L) is administered into a living body B using the medical needle assembly 10 will be described.

[0049] To administer intravenous fluid L1 using the medical needle assembly 10, first, a cap (not shown) is removed from the needle body 12 to expose the needle body 12. As shown in Figure 2, in the initial state of the medical needle assembly 10, the needle hub 14 is housed in the cover lumen 162 of the needle cover member 16. The needle tip 122 of the needle body 12 protrudes in the direction of the tip beyond the tip of the needle cover member 16. A stopper 34 provided on the tube 18 is in contact with the skirt portion 28 of the needle cover member 16.

[0050] Next, the user closes the pair of wings 322 by pinching them with their fingers (see the dashed line shape in Figure 4). While holding the closed pair of wings 322 with their fingers, the needle body 12 is inserted into the living body B as shown in Figure 6. The tip of the needle body 12, including the needle tip 122 (hereinafter also referred to as the "puncture site 12P"), is left in the living body B.

[0051] After inserting the needle body 12 into the living body B, the user releases their grip on the pair of wing portions 322. The pair of wing portions 322 return to a nearly flat state by elasticity so as to conform to the skin of the living body B.

[0052] Then, the supply of infusion fluid L1 from the tube 18 to the medical needle assembly 10 is started. The infusion fluid L1 is supplied from the tube 18 to the lumen 121 of the needle body 12 through the lumen 141 of the needle hub 14. The infusion fluid L1 flows along the lumen 121 toward the tip and is then administered into the living body B from the needle tip 122.

[0053] After the administration of the infusion fluid L1 to the living body B using the medical needle assembly 10 is completed, the needle body 12 is removed from the living body B. Specifically, the user grasps the stopper 34 and moves the tube 18 toward the proximal end while the wing portion 322 of the wing member 32 is fixed to the living body B. Together with the tube 18, the needle hub 14 and the needle body 12 move relative to the needle cover member 16 toward the proximal end. The tip of the needle body 12 (puncture site 12P) is exposed to the outside of the living body B. As shown in Figure 7, body fluid L2 from inside the living body B is attached to the puncture site 12P. Specifically, body fluid L2 is attached to the outer surface and tip of the puncture site 12P.

[0054] As the tube 18 is moved further towards the proximal end, the tip of the needle body 12 moves from the tip opening 163 of the needle cover member 16 toward the cover lumen 162. The puncture site 12P of the needle body 12 reaches the liquid absorption part 22, and the body fluid L2 attached to the puncture site 12P comes into contact with the liquid absorption part 22, causing the liquid absorption part 22 to expand radially inward. As the liquid absorption part 22 expands, the opening area of ​​the hub lumen 141 decreases. As the needle body 12 moves towards the proximal end, the outer surface of the needle body 12 comes into further contact with the liquid absorption part 22, which promotes the expansion of the liquid absorption part 22. As the liquid absorption part 22 expands, the opening area of ​​the hub lumen 141 decreases even further. In other words, when the liquid absorption part 22 expands, the opening area of ​​the cover lumen 162 toward the tip becomes smaller than that of the needle tip 122.

[0055] As shown in Figure 8, the needle body 12 moves further toward the proximal end, and with the needle tip 122 housed in the hub lumen 141 toward the proximal end beyond the liquid absorption portion 22, the tip opening 163 of the needle cover member 16 is closed by the expanded liquid absorption portion 22, resulting in a closed state. Communication between the tip opening 163 of the needle cover member 16 and the outside is blocked. Note that the tip opening 163 of the needle cover member 16 does not need to be completely closed by the liquid absorption portion 22.

[0056] With the needle body 12 housed in the cover lumen 162, the infusion fluid L1 remaining in the lumen 121 of the needle body 12 may leak into the cover lumen 162. Since the tip opening 163 of the needle cover member 16 is sealed by the liquid absorbent part 22, the infusion fluid L1 does not leak out of the needle cover member 16 from the tip opening 163. Since the sealing part 24 abuts against the inner surface of the peripheral wall part 161, the infusion fluid L1 does not leak out of the base end of the needle cover member 16 either. In other words, the cover lumen 162 becomes a sealed space with the expanded liquid absorbent part 22 and the sealing part 24 sealed, and the needle tip 122 is housed within this sealed space. When the infusion fluid L1 leaks into the cover lumen 162, the infusion fluid L1 flows towards the tip and comes into contact with the liquid absorbent part 22, which promotes the expansion of the liquid absorbent part 22.

[0057] The liquid absorption section 22 may be closed at the tip opening 163 solely by the body fluid L2 adhering to the puncture site 12P of the needle body 12, or it may be closed at the tip opening 163 by the infusion fluid L1 and body fluid L2 discharged from the needle body 12 within the cover lumen 162.

[0058] With the needle tip 122 housed in the sealed space, the fitting portion 142 of the needle hub 14 engages with the fitting portion 26 of the needle cover member 16. Movement of the needle hub 14 and the needle body 12 toward the base end relative to the needle cover member 16 is restricted.

[0059] This embodiment provides the following effects.

[0060] As shown in Figure 2, the medical needle assembly 10 includes a needle cover member 16 that can cover the needle tip 122 of the needle body 12 by moving relative to the needle body 12 in the tip direction. The needle cover member 16 is provided with a liquid absorbent portion 22 that extends beyond the needle tip 122 of the needle body 12 when the needle body 12 is housed in the cover lumen 162. The liquid absorbent portion 22 is formed from a swelling material, and when the liquid absorbent portion 22 expands, the opening area of ​​the cover lumen 162 in the tip direction becomes smaller than that of the needle tip 122.

[0061] According to this medical needle assembly 10, by housing the needle body 12 that has been punctured into the living body B in the needle cover member 16, the liquid absorption part 22 expands, effectively suppressing the leakage of liquid L from the cover lumen 162 to the outside.

[0062] As shown in Figure 8, the needle hub 14 is positioned further towards the proximal end than the needle tip 122 of the needle body 12 and includes a sealing portion 24 that seals the cover lumen 162. With this configuration, the cover lumen 162 can be sealed by the liquid absorption portion 22 and the sealing portion 24, and leakage of liquid L from the needle cover member 16 to the outside can be prevented more effectively.

[0063] The needle cover member 16 is provided in a position relative to the base end of the sealing portion 24 and includes a fitting portion 26 that fits onto the needle hub 14. With this configuration, the needle cover member 16 can be effectively held relative to the needle hub 14 while the cover lumen 162 is sealed.

[0064] As shown in Figure 2, the liquid absorbent portion 22 is provided at the tip of the needle cover member 16 and on the inner circumferential surface of the peripheral wall portion 161 of the needle cover member 16. With this configuration, the liquid absorbent portion 22 can effectively reduce the opening area at the tip of the needle cover member 16.

[0065] The liquid absorbent portion 22 is in contact with the outer surface of the needle body 12 in its initial state. With this configuration, the needle body 12 can be reliably brought into contact with the liquid absorbent portion 22 after being punctured into the living body B.

[0066] As shown in Figure 3, the needle cover member 16 is provided with a pair of wing portions 322 extending from the peripheral wall portion 161 in a direction perpendicular to the axial direction. With this configuration, the needle body 12 can be easily punctured by gripping the wing portions 322. The wing portions 322 can effectively maintain the position of the needle body 12.

[0067] As shown in Figure 2, the tip of the needle cover member 16 has a tip opening 163, and the tip opening 163 is closed when the liquid absorption part 22 expands.

[0068] With this configuration, leakage of liquid L from the tip opening 163 of the needle cover member 16 to the outside is suppressed even more effectively.

[0069] As shown in Figure 9, the modified medical needle assembly 10A includes a liquid absorbent portion 22A. The liquid absorbent portion 22A has an inner circumference portion 221A facing the needle body 12. The inner circumference portion 221A has a droplet attachment portion 50 that is formed in an inverse tapered shape toward the tip.

[0070] As the puncture site 12P of the needle body 12 moves toward the proximal end along the inner circumference 221A of the liquid absorption portion 22A, the body fluid L2 adhering to the outer surface of the needle body 12 is captured by the droplet attachment portion 50, which contracts toward the proximal end. The body fluid L2 adhering to the droplet attachment portion 50 causes the liquid absorption portion 22A to expand radially inward. The expanded liquid absorption portion 22A reduces the opening area of ​​the cover lumen 162.

[0071] The following effects are produced by the torture method:

[0072] The liquid absorbent portion 22A has an inner circumference portion 221A facing the needle body 12, and the inner circumference portion 221A is formed in a reverse tapered shape toward the tip. With this configuration, when the needle body 12 is housed in the needle cover member 16, the liquid L (body fluid L2) adhering to the needle body 12 can be effectively absorbed into the tip of the inner circumference portion 221A. In addition, since the cross-sectional area of ​​the tip of the liquid absorbent portion 22A can be reduced, contact between the tip of the needle cover member 16 and the liquid absorbent portion 22A that has absorbed the infusion fluid L1 and body fluid L2 can be effectively suppressed.

[0073] Furthermore, the medical needle assembly 10 is not limited to a configuration that includes a wing member 32 and administers an intravenous fluid L1 supplied through a tube 18. For example, as shown in Figure 10A, the medical needle assembly 10B includes a needle cover member 16B and a needle hub 14B. A collection container 60 capable of collecting body fluid L2 from a living organism B can be connected to the base end of the needle hub 14B. The collection container 60 is, for example, a syringe 60A for collecting blood.

[0074] As shown in Figure 10A, after connecting the collection container 60 to the initial medical needle assembly 10B, the needle body 12 is inserted into the living body B and left in place. The needle cover member 16B is fixed to the surface of the living body B. Due to the suction action of the collection container 60, body fluid L2 is collected into the collection container 60 via the needle hub 14B and the needle body 12. The collection container 60 is moved relative to the needle cover member 16B toward the proximal end, and the needle body 12 is withdrawn from the living body B. Due to the body fluid L2 adhering to the needle body 12, the liquid absorbent part 22 expands, as shown in Figure 10B, and the opening area of ​​the cover lumen 162 decreases. Furthermore, after the needle tip 122 of the needle body 12 is housed in the cover lumen 162, the liquid L (blood) leaking from the needle tip 122 of the needle body 12 comes into contact with the liquid absorbent part 22, which promotes the expansion of the liquid absorbent part 22.

[0075] While this disclosure has been described in detail, it is not limited to the individual embodiments described above. These embodiments can be added, replaced, modified, partially deleted, etc., in any way that does not depart from the gist of this disclosure or from the intent of this disclosure derived from the claims and their equivalents. These embodiments can also be implemented in combination. For example, the order of operations and processes in the embodiments described above are given as examples only and are not limited thereto. The same applies when numerical values ​​or mathematical formulas are used in the description of the embodiments described above.

Claims

1. A medical needle assembly comprising: a hollow needle body; a needle hub connected to the base end of the needle body; and a needle cover member capable of covering at least the tip of the needle body by moving relative to the needle body in the tip direction, wherein the needle cover member comprises: a cover cavity formed inside the peripheral wall portion and capable of accommodating the needle body; and a liquid absorbent portion provided on the peripheral wall portion and positioned in the tip direction of the needle body beyond the tip of the needle body when the needle body is accommodating the cover cavity, wherein the liquid absorbent portion is formed from a swelling material, and when the liquid absorbent portion expands, the opening area of ​​the cover cavity in the tip direction becomes smaller than that of the needle tip, the medical needle assembly.

2. A medical needle assembly according to claim 1, wherein either the needle body or the needle hub is provided with a sealing portion that is positioned in a proximal direction from the needle tip of the needle body and seals the lumen of the cover.

3. A medical needle assembly according to claim 2, wherein the needle cover member is provided with a fitting portion that is provided in the direction toward the base end from the sealing portion and is fitted into the needle hub.

4. A medical needle assembly according to claim 1 or 2, wherein the liquid absorbent portion is provided at the tip of the needle cover member and on the inner surface of the peripheral wall portion of the needle cover member.

5. A medical needle assembly according to claim 4, wherein the liquid absorbent portion is in contact with the outer surface of the needle body in its initial state.

6. A medical needle assembly according to claim 5, wherein the liquid absorbent portion has an inner circumference facing the needle body, and the inner circumference is formed in a reverse tapered shape toward the tip.

7. A medical needle assembly according to claim 1, wherein the needle cover member comprises a pair of elastically deformable wing portions extending from the peripheral wall portion in a direction intersecting the axial direction.

8. A medical needle assembly according to claim 4, wherein the tip of the needle cover member has a tip opening that opens toward the tip and communicates with the lumen of the cover, and the tip opening is closed when the liquid absorbent part expands.

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