CN105944190B

CN105944190B - Matched needle for safety insulin pen

Info

Publication number: CN105944190B
Application number: CN201610377194.6A
Authority: CN
Inventors: 张谦; 陈洪
Original assignee: Zhejiang Kindly Medical Devices Co Ltd
Current assignee: Zhejiang Kindly Medical Devices Co Ltd
Priority date: 2016-05-30
Filing date: 2016-05-30
Publication date: 2022-05-27
Anticipated expiration: 2036-05-30
Also published as: CN105944190A

Abstract

The invention relates to a needle matched with a safe insulin pen, which comprises a needle seat and a safe protective sleeve, wherein the needle seat is fixedly provided with a needle tube, the needle seat comprises a pen cap part in threaded fit with the end part of the insulin pen, and a sliding connection part coaxially and fixedly arranged at the front end of the pen cap part, the sliding connection part is cylindrical, the front end of the needle tube extends out of the end part of the sliding connection part, the safe protective sleeve is a barrel-shaped component with the inner diameter in clearance fit with the sliding connection part and an opening at the rear end, and a needle hole for the needle to penetrate out is arranged at the position of the front end of the safe protective sleeve corresponding to the needle tube. The safety sheath is arranged on the needle matched with the safety insulin pen, and after the needle matched with the insulin pen is used, the safety sheath slides forwards to cover the exposed needle head, so that puncture is avoided, and the risk of cross infection is reduced.

Description

Matched needle for safety insulin pen

Technical Field

The invention relates to a medical needle, in particular to a matched needle for a safe insulin pen.

Background

Diabetes is a group of metabolic diseases characterized by hyperglycemia. Hyperglycemia is caused by a defect in insulin secretion or an impaired biological action, or both. Hyperglycemia, which is present in long-term diabetes, leads to chronic damage to, dysfunction of, various tissues, particularly, the eyes, kidneys, heart, blood vessels, nerves.

Due to a plurality of factors such as improvement of living standard, change of dietary structure, increasingly tense life rhythm, and life style of little movement and sitting, the incidence rate of diabetes mellitus in the world is rapidly increased, and the diabetes mellitus becomes the third chronic disease which seriously threatens human health after tumor and cardiovascular disease. At present, the number of diabetes patients in the world exceeds 1.2 hundred million, Chinese patients are grouped in the world second, the incidence rate of diabetes in China is up to 9.6 percent at present, and the diabetes is still a serious public health problem in China in the next 50 years. The current state of diabetes in China is very severe from survey data, and China has become the fastest growing region of diabetes worldwide and the first major country of diabetes in the world. In the aspect of diabetes treatment, the current common practice is to adopt oral medication for treating the diabetes patients with relatively light disease, but for the diabetes patients with relatively heavy disease, insulin injection is needed to control the disease, and the safe insulin pen matched with the needle is used for self-injecting insulin for the diabetes patients, so that the use is convenient and simple.

The supporting needle of using of current insulin pen includes one with insulin pen tip match, be similar to the needle file of pen cap, the fixed needle tubing that is equipped with on the needle file terminal surface, the needle file inner wall is equipped with sealing washer and screw thread and insulin pen tip screw-thread fit, and needle tubing and needle file are equipped with little sheath and big sheath outward respectively to overlap. The matched needle of the insulin pen is a disposable article, and needs to be recovered and harmlessly treated after being used, and because the needle head of the matched needle of the used insulin pen is exposed, the matched needle is very easy to be punctured and has the risk of cross infection if carelessness is caused in the treatment and recovery processes.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a matched needle of a safe insulin pen, which can avoid the risk of cross infection.

In order to achieve the purpose, the invention discloses a matched needle for a safe insulin pen, which comprises a needle seat fixedly provided with a needle tube, and is characterized in that: the safety syringe is characterized by also comprising a safety sheath, wherein the needle base comprises a pen cap part in threaded fit with the end part of the insulin pen and a sliding connection part coaxially and fixedly arranged at the front end of the pen cap part, the sliding connection part is cylindrical, the front end of the needle tube extends out of the end part of the sliding connection part, the safety sheath is a barrel-shaped component with the inner diameter in clearance fit with the sliding connection part and an opening at the rear end, a needle hole for the penetration of a needle head is arranged at the position, corresponding to the needle tube, of the front end of the safety sheath, a groove extending along the circumferential direction is arranged on the outer wall of the safety sheath, at least part of the groove is deep and a through groove part with the inner wall communicated with the inner cavity of the safety sheath, an expandable and contractible elastic clamping ring is arranged in the groove, part of the elastic clamping ring is embedded into the inner cavity of the safety sheath from the through groove part under the self elastic action, two sections of long sliding grooves and short sliding grooves are arranged side by side along the axial direction on the side wall of the safety sheath and are respectively a first groove and a second groove, the front ends of the first groove and the second groove towards the needle point are communicated through a section of chute, the side wall of the sliding connection part is provided with a convex block which is in clearance fit with the first groove and the second groove, the lug is matched with the first groove and the second groove to slide, a clamping groove arranged along the circumferential direction is arranged on the side wall of the sliding part close to the front end, when the lug is matched in the first groove, the clamping groove is axially aligned with the through groove part, and when the lug is positioned at the tail end of the first groove, the needle tube is completely positioned in the inner cavity of the safety sheath, when the lug is positioned at the tail end of the second groove, the needle tip of the needle tube is positioned at the end part of the safety sheath, and a return spring formed by a compression spring is further arranged in the inner cavity of the safety sheath, one end of the return spring is abutted against the inner wall of the front end of the inner cavity of the safety sheath, and the other end of the return spring is abutted against the sliding connection part, so that the safety sheath always has a forward elastic force.

Compared with the prior art, the safety sheath is arranged on the needle matched with the safety insulin pen, and after the needle matched with the insulin pen is used, the safety sheath slides forwards to cover the exposed needle head, so that puncture is avoided, and the risk of cross infection is reduced.

The invention is further described with reference to the following figures and specific embodiments.

Drawings

FIG. 1 is a front elevational view of a structure prior to use of an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the structure of an embodiment of the present invention prior to use;

FIG. 3 is a front view of a use configuration of an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a use configuration of an embodiment of the present invention;

FIG. 5 is a front view of a structure after use of an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a structure after use of an embodiment of the present invention;

FIG. 7 is a schematic perspective view of a preferred embodiment of the present invention before use;

FIG. 8 is a second schematic perspective view of the present invention before use;

FIG. 9 is an exploded view of the exemplary embodiment of the present invention;

fig. 10 is an enlarged view of a portion of fig. 9I.

Detailed Description

As shown in fig. 1 and 2, the needle for matching with the safety insulin pen comprises a needle base 2 and a safety sheath 3, wherein the needle base 2 is fixedly provided with a needle tube 1, the needle base 2 comprises a pen cap part 202 in threaded fit with the end part of the insulin pen and a sliding connection part 201 coaxially and fixedly arranged at the front end of the pen cap part 202, the sliding connection part 201 is cylindrical, the pen cap part 202 can be in other cylindrical shapes, and the front end of the needle tube 1 extends out of the end part of the sliding connection part 201. The safety sheath 3 is a barrel-shaped component with the inner diameter in clearance fit with the sliding connection part 201 and an opening at the rear end, and a needle hole 301 for a needle to penetrate out is arranged at the position, corresponding to the needle tube 1, of the front end of the safety sheath 3. In the present embodiment, as shown in fig. 7-9, the hub 2 has a stepped shaft shape formed by two cylindrical sections with different diameters, the diameter of the cap portion 202 is larger than that of the sliding connection portion 201, and the sidewall of the inner cavity of the cap portion 202 is provided with a thread matching with the end of the insulin pen. Safety sheath 3 is internal diameter and sliding connection portion 201 clearance fit, rear end open-ended cask form component, and the front end center is equipped with one section conduction pipe, the conduction pipe centre bore constitutes pinhole 301, be equipped with on safety sheath 3's the outer wall along the recess 302 of circumference extension, recess 302 can be curved one section, also can be the annular. The groove 302 is preferably near the rear end of the safety sheath 3, said groove 302 is at least partially deep and has a through groove 303 whose inner wall is in communication with the lumen of the safety sheath 3, an expandable and contractible elastic collar 4 is arranged in the groove 302, part of the elastic collar 4 is embedded into the inner cavity of the safety sheath 3 from the through groove part 303 under the self elasticity, a long sliding groove and a short sliding groove are arranged on the side wall of the safety sheath 3 along the axial direction in parallel, and are respectively a first groove 304 and a second groove 305, the front ends of the first groove 304 and the second groove 305 towards the needlepoint are communicated through a section of inclined groove 306, the side wall of the sliding connection part 201 is provided with a projection 203 which is in clearance fit with the first groove 304 and the second groove 305, the projection 203 is fitted to slide in the first groove 304 and the second groove 305, the projection 203 is initially fitted in the second groove 305, during use, the slide slides from the second slot 305 to the first slot 304 via the chute 306. The needle tube is characterized in that a clamping groove 204 arranged along the circumferential direction is formed in the side wall, close to the front end, of the sliding connection portion 201, the protruding block 203 is matched in the first groove 304, the clamping groove 204 is aligned with the groove penetrating portion 303 along the axial direction, when the protruding block 203 is located at the tail end of the first groove 304, the needle tube 1 is completely located in the inner cavity of the safety sheath 3, when the protruding block 203 is located at the tail end of the second groove 305, the needle point of the needle tube 1 is located at the end portion of the safety sheath 3, a return spring 5 formed by a compression spring is further arranged in the inner cavity of the safety sheath 3, one end of the return spring 5 abuts against the inner wall of the front end of the inner cavity of the safety sheath 3, the other end of the return spring abuts against the sliding connection portion 201, preferably, an annular concave cavity 205 is formed in the front end face of the sliding connection portion 201, and one end of the return spring 5 is arranged in the annular concave cavity 205, so that the safety sheath 3 always has a forward elastic force. The lengths of the safety shield 3 and the sliding connection part 201 and the positions of the groove 302 and the slot 204 are proper, that is, when the bump 203 is at the tail end of the second groove 305, the needle tip of the needle tube 1 is at the end of the safety shield 3 (preferably, the needle tip is slightly exposed), a certain sliding gap is required from the tail end of the safety shield 3 to the pen cap part 202, the gap distance is similar to or equal to the length of the second groove 305, and the needle tube 1 can be exposed from the front end of the safety shield 3 by a sufficient length to complete injection; the length of the safety shield 3 is such that the needle cannula 1 is completely inside the lumen of the safety shield 3 when the cam 203 is at the end of the first slot 304.

In order to make the protrusion 203 smoothly slide from the second slot 305 to the first slot 304 during the use process, in this embodiment, the side wall of the second slot 305 near the position communicating with the first slot 304 is a slope 307, and the opposite side of the protrusion 203 is also a slope 307 with the same direction.

In order to make the stress of the safety sheath 3 more uniform in the using process and to ensure reliable operation, more than one set of the first groove 304 and the second groove 305, the clamping groove 204 and the bump 203 may be uniformly distributed on the side wall of the safety sheath 3, in this specific embodiment, two sets of the first groove 304 and the second groove 305 are arranged on the side wall of the safety sheath 3, and the two sets are arranged in axial symmetry; the groove 302 is an annular groove 302 arranged along the circumferential direction, a pair of through groove portions 303 are arranged in the groove 302, the through groove portions 303 are symmetrically distributed along the circumferential direction, a pair of clamping grooves 204 are arranged on the side wall, close to the front end, of the sliding connection portion 201, and the pair of clamping grooves 204 are symmetrically distributed along the circumferential direction; a pair of projections 203 are arranged on the side wall of the sliding connection part 201, and the pair of projections 203 are arranged in axial symmetry.

As a protection measure before use, preferably, an outer sheath 6 is further sleeved outside the needle base 2 and the safety sheath 3, the outer sheath 6 is cylindrical, the front end of the outer sheath is closed, the rear end opening of the outer sheath is in interference fit or threaded fit with the outer wall of the pen cap part 202 to form detachable connection, and the outer sheath is detached when in use.

The working principle of the needle matched with the safety insulin pen is as follows:

in the initial state, as shown in fig. 1 and 2, under the elastic force of the return spring 5, the bump 203 is located at the tail end of the second groove 305, the safety shield 3 slides forwards to be limited, and the needle tip of the needle tube 1 is located at the end of the safety shield 3. When in use, as shown in fig. 3 and 4, the matched needle of the safety insulin pen is installed on the front end of the safety insulin pen through threaded connection, the needle point is aligned with the injection part to push and insert the needle, the pushing force overcomes the elastic force of the return spring 5, so that the safety sheath 3 retreats along the sliding connection part 201 of the needle seat 2, in the retreating process, the needle point gradually extends out, the bump 203 moves forwards along the second groove 305 and slides to the front end of the first groove 304 through the inclined groove 306, the needle point extends out to the right position to perform injection, in the process that the bump 203 slides to the first groove 304 along the inclined groove 306 of the second groove 305, under the action of the inclined surface 306, the safety sheath 3 and the sliding connection part 201 of the needle seat 2 relatively rotate, and the groove penetrating part 303 in the groove 302 is aligned with the clamping groove 204 in the axial direction; after the injection is completed, the pushing force is eliminated, the bump 203 is positioned at the tail end of the first groove 304 under the elastic force of the return spring 5, and simultaneously, the elastic collar 4 in the groove 302 is exposed from the groove penetrating part 303 and embedded into the clamping groove 204 under the elastic action of the elastic collar, so that the safety sheath 3 is prevented from sliding out of the needle seat 2, the needle tube 1 is completely covered in the inner cavity of the safety sheath 3, as shown in fig. 5 and 6, the accidental injury is avoided, and the risk of cross infection is reduced.

Claims

1. The utility model provides a safe insulin pen is supporting with needle, includes the fixed needle file that is equipped with the needle tubing, its characterized in that: the safety syringe is characterized by also comprising a safety sheath, wherein the needle base comprises a pen cap part in threaded fit with the end part of the insulin pen and a sliding connection part coaxially and fixedly arranged at the front end of the pen cap part, the sliding connection part is cylindrical, the front end of the needle tube extends out of the end part of the sliding connection part, the safety sheath is a barrel-shaped component with the inner diameter in clearance fit with the sliding connection part and an opening at the rear end, a needle hole for the penetration of a needle head is arranged at the position, corresponding to the needle tube, of the front end of the safety sheath, a groove extending along the circumferential direction is arranged on the outer wall of the safety sheath, at least part of the groove is deep and a through groove part with the inner wall communicated with the inner cavity of the safety sheath, an expandable and contractible elastic clamping ring is arranged in the groove, part of the elastic clamping ring is embedded into the inner cavity of the safety sheath from the through groove part under the self elastic action, two sections of long sliding grooves and short sliding grooves are arranged side by side along the axial direction on the side wall of the safety sheath and are respectively a first groove and a second groove, the front ends of the first groove and the second groove towards the needle point are communicated through a section of chute, the side wall of the sliding connection part is provided with a convex block which is in clearance fit with the first groove and the second groove, the lug is matched with the first groove and the second groove to slide, a clamping groove arranged along the circumferential direction is arranged on the side wall of the sliding part close to the front end, when the lug is matched in the first groove, the clamping groove is axially aligned with the through groove part, and when the lug is positioned at the tail end of the first groove, the needle tube is completely positioned in the inner cavity of the safety sheath, when the lug is positioned at the tail end of the second groove, the needle tip of the needle tube is positioned at the end part of the safety sheath, and a return spring formed by a compression spring is further arranged in the inner cavity of the safety sheath, one end of the return spring is abutted against the inner wall of the front end of the inner cavity of the safety sheath, and the other end of the return spring is abutted against the sliding connection part, so that the safety sheath always has a forward elastic force.

2. The safety insulin pen compatible needle according to claim 1, characterized in that: the appearance of needle file is the ladder axle form of the cylindrical constitution of being different by two sections diameters, cap portion diameter is greater than sliding connection portion diameter, cap portion inner chamber lateral wall is equipped with insulin pen tip complex screw thread, safety sheath is internal diameter and sliding connection portion clearance fit, rear end open-ended cask form component, and preceding tip center is equipped with one section conduction pipe, the conduction pipe constitutes the pinhole, the terminal surface is equipped with the annular cavity before the sliding connection portion, reset spring one end is arranged in the annular cavity.

3. The safety insulin pen compatible needle according to claim 2, characterized in that: two groups of first grooves and second grooves are arranged on the side wall of the safety sheath, and the two groups are arranged in an axisymmetric manner; the groove is an annular groove arranged along the circumferential direction, a pair of through groove parts are arranged in the groove and symmetrically distributed along the circumferential direction, a pair of clamping grooves are arranged on the side wall, close to the front end, of the sliding part, and the pair of clamping grooves are symmetrically distributed along the circumferential direction; the side wall of the sliding connection part is provided with a pair of convex blocks, and the pair of convex blocks are arranged in axial symmetry.

4. The safety insulin pen compatible needle according to claim 1, characterized in that: the outer sheaths are sleeved outside the needle base and the safety sheath.