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EP-4740981-A1 - INDWELLING NEEDLE

EP4740981A1EP 4740981 A1EP4740981 A1EP 4740981A1EP-4740981-A1

Abstract

Provided is an indwelling needle, including a needle hub, a catheter hub, and a needle tip protection housing. The needle hub is provided with a needle tube. The catheter hub is provided with a needle piercing channel and an injection side channel. A catheter is disposed at a distal end of the needle piercing channel. An elastic silicone block is disposed in the needle piercing channel. A limiting piece and an elastic piece are disposed in the needle tip protection housing. A first limiting hole allowing the needle tube to pass through is opened on the limiting piece. A second limiting hole allowing the needle tube to pass through is opened on the elastic piece. In an initial state, the needle tube passes through the first limiting hole and the second limiting hole in the needle tip protection housing, and extends into the catheter after piercing the elastic silicone block. In a needle withdrawal state, the elastic silicone block seals a piercing hole of the needle tube by virtue of an elastic force of the elastic silicone block. The elastic piece is deformed by an elastic force of the elastic piece such that the first limiting hole and the second limiting hole are misaligned, and a passage path of the needle tube is blocked.

Inventors

  • LU, JUN

Assignees

  • CMT Health USA LLC
  • Lu, Jun

Dates

Publication Date
20260513
Application Date
20230907

Claims (10)

  1. An indwelling needle, comprising a needle hub (1), a catheter hub (2), and a needle tip protection housing (3), wherein the needle hub (1) is provided with a needle tube (11), the catheter hub (2) is provided with a needle piercing channel (21) and an injection side channel (22), and a catheter (23) is disposed at a distal end of the needle piercing channel (21), wherein an elastic silicone block (4) is disposed in the needle piercing channel (21), a limiting piece (5) and an elastic piece (6) are disposed in the needle tip protection housing (3), a first limiting hole (51) allowing the needle tube (11) to pass through is opened on the limiting piece (5), and a second limiting hole (61) allowing the needle tube (11) to pass through is opened on the elastic piece (6); in an initial state, the needle tube (11) passes through the first limiting hole (51) and the second limiting hole (61) in the needle tip protection housing (3), and extends into the catheter (23) after piercing the elastic silicone block (4); and in a needle withdrawal state, the elastic silicone block (4) seals a piercing hole of the needle tube (11) by virtue of an elastic force of the elastic silicone block (4), and the elastic piece (6) is deformed by an elastic force of the elastic piece (6) such that the first limiting hole (51) and the second limiting hole (61) are misaligned, and a passage path of the needle tube (11) is blocked.
  2. The indwelling needle according to claim 1, wherein the elastic silicone block (4) comprises two isolation plugs (41) arranged at intervals, a hollow sleeve (42) is connected between the two isolation plugs (41), and the needle tube (11) passes through one isolation plug (41) of the two isolation plugs (41), then passes through a cavity of the hollow sleeve (42), and then passes out from the other isolation plug (41) of the two isolation plugs (41).
  3. The indwelling needle according to claim 1, wherein the elastic piece (6) comprises a fixing portion (62), a V-shaped energy storage portion (63), and an opening portion (64) that are sequentially connected, a limiting block (31) for clamping the fixing portion (62) is disposed in the needle tip protection housing (3), the V-shaped energy storage portion (63) exerts a force on the opening portion (64) to repel the opening portion (64) away from the fixing portion (62), and the second limiting hole (61) is formed on the opening portion (64).
  4. The indwelling needle according to claim 3, wherein the opening portion (64) is provided with a snap portion (65) extending toward the catheter hub (2), the catheter hub (2) is inserted into the needle tip protection housing (3), an insertion portion of the catheter hub (2) is provided with a protrusion (24), and the snap portion (65) engages with the protrusion (24).
  5. The indwelling needle according to claim 1, wherein the limiting piece (5) is located at an entry for the needle tube (11) on the needle tip protection housing (3), and the needle tip protection housing (3) is provided with an insertion slot (32) allowing insertion of the limiting piece (5).
  6. The indwelling needle according to claim 1, wherein during a needle withdrawal process of the needle tube (11), in a case where the needle tube (11) exits the elastic silicone block (4), the elastic piece (6) deforms and cooperates with the limiting piece (5) to bend the needle tube (11).
  7. The indwelling needle according to claim 6, wherein a catheter hub rear cover (7) is disposed at an opening end of the needle piercing channel (21), the catheter hub rear cover (7) axially limits the elastic silicone block (4), and a relief opening (71) consistent with a bending direction of the needle tube (11) is opened on the catheter hub rear cover (7).
  8. The indwelling needle according to claim 1, wherein one side surface of the needle tip protection housing (3) is open, and a cover plate (8) connected by snap-fit is disposed on the open surface.
  9. The indwelling needle according to claim 1, wherein the needle hub (1) is fixed to the needle tip protection housing (3) by a plug-in connection, an insertion portion of one of the needle hub (1) and the needle tip protection housing (3) is provided with a convex rib (33), and the other of the needle hub (1) and the needle tip protection housing (3) is provided with a clamping slot (12) corresponding to the convex rib (33).
  10. The indwelling needle according to claim 9, wherein the needle hub (1) and the needle tip protection housing (3) are marked with arrows (13) guiding separation, respectively.

Description

This application claims priority to Chinese Patent Application No. 202310976903.2 filed with the China National Intellectual Property Administration (CNIPA) on Aug. 04, 2023, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the technical field of medical devices, for example, to an indwelling needle. BACKGROUND An intravenous indwelling needle is a tool for infusion. It commonly consists of a stainless steel needle core, a soft outer hollow cannula, and a plastic needle hub. During a puncture, the outer hollow cannula and the needle core are inserted into a blood vessel together. Thereafter, the needle core is withdrawn, leaving the outer hollow cannula in the blood vessel. For patients requiring long-term infusion or intermittent and continuous infusion, the use of an intravenous indwelling needle can avoid damage and complications caused by repeated punctures. Therefore, the intravenous indwelling needle is widely used in clinical practice. SUMMARY This application provides an indwelling needle including a needle hub, a catheter hub, and a needle tip protection housing. The needle hub is provided with a needle tube. The catheter hub is provided with a needle piercing channel and an injection side channel. A catheter is disposed at a distal end of the needle piercing channel. An elastic silicone block is disposed in the needle piercing channel. A limiting piece and an elastic piece are disposed in the needle tip protection housing. A first limiting hole allowing the needle tube to pass through is opened on the limiting piece. A second limiting hole allowing the needle tube to pass through is opened on the elastic piece. In an initial state, the needle tube passes through the first limiting hole and the second limiting hole in the needle tip protection housing, and extends into the catheter after piercing the elastic silicone block. In a needle withdrawal state, the elastic silicone block seals a piercing hole of the needle tube by virtue of an elastic force of the elastic silicone block. The elastic piece is deformed by an elastic force of the elastic piece such that the first limiting hole and the second limiting hole are misaligned, and a passage path of the needle tube is blocked. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view illustrating the external appearance of an indwelling needle according to an embodiment of this application.FIG. 2 is an exploded view of an indwelling needle according to an embodiment of this application.FIG. 3 is a view illustrating the installation of an elastic piece and a limiting piece in a needle tip protection housing of an indwelling needle according to an embodiment of this application.FIG. 4 is a view of an elastic piece in an indwelling needle according to an embodiment of this application.FIG. 5 is a view of a limiting piece in an indwelling needle according to an embodiment of this application.FIG. 6 is a view of a catheter hub rear cover in an indwelling needle according to an embodiment of this application. Reference list 1needle hub11needle tube12clamping slot13arrow2catheter hub21needle piercing channel22injection side channel23catheter24protrusion3needle tip protection housing31limiting block32insertion slot33convex rib4elastic silicone block41isolation plug42hollow sleeve5limiting piece51first limiting hole6elastic piece61second limiting hole62fixing portion63V-shaped energy storage portion64opening portion65snap portion7catheter hub rear cover71relief opening8cover plate DETAILED DESCRIPTION Indwelling needles are mostly used in a form where the needle is withdrawn after use. After the needle core is withdrawn, the indwelling needle has a risk of leakage due to the needle hole. In addition, the needle core may be reused. In particular, after the needle tip has contacted a patient's blood, the reused needle core may cause infection to external personnel through contact, leading to hazards such as tetanus, bacterial invasion, and infectious disease transmission. In view of the above circumstances, embodiments of this application provide an indwelling needle. The embodiments of this application are described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals throughout indicate the same or similar components or components having the same or similar functions. The embodiments described below with reference to the drawings are exemplary, intended to explain this application, and not to be construed as limiting this application. In the description of this application, unless otherwise expressly specified and limited, a term "connected to each other", "connected", or "secured" is to be construed in a broad sense, for example, as securely connected or detachably connected; mechanically connected or electrically connected; indirectly connected to each other via an intermediary; or internally connected between two components or inter