Blood taking needle capable of adjusting puncture depth

Abstract

The utility model relates to a blood taking needle capable of adjusting puncture depth, which comprises a needle cylinder, a needle head and a telescopic sleeve, a needle cavity is arranged in the needle cylinder, the needle head is arranged in the needle cavity, a needle tip of the needle head extends to the outer side of the needle cylinder, external threads are arranged on the outer surface of the needle cylinder, and an internal thread knob is in threaded connection with the outer surface of the external threads. An adjusting rod is rotationally mounted in the internal thread knob; the end part of the adjusting rod is inserted into the needle cavity and is connected with the needle head; an annular cavity is formed in the needle cylinder, the telescopic sleeve is arranged in the annular cavity, a limiting groove A is formed in the inner wall of the annular cavity, a limiting block A is arranged in the limiting groove A, and the end of the limiting block A is connected with the outer surface of the telescopic sleeve; and a spring A is arranged in the annular cavity. The needle head can be driven to ascend and descend by rotating the internal thread knob, so that the purpose of adjusting the puncture depth is achieved, individual requirements of different skin thicknesses can be met, and the situation of repeated utilization can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely is a blood taking needle of adjustable puncture depth. BACKGROUND

[0002] Disposable peripheral blood taking needle is a kind of medical tool specially designed for extracting the blood of patient fingertip or other peripheral part, and blood sample is obtained by piercing the skin to carry out detection.The existing blood taking needle is provided with telescopic sleeve capable of telescoping at bottom, needle head is located in telescopic sleeve, in use, telescopic sleeve is pressed skin to make it contract, and needle head is exposed and punctured.

[0003] But the blood taking needle on current market generally only has single puncture depth, which leads to that it cannot meet the needs of all individuals when facing patients with different skin thickness, and there is certain limitation.

[0004] And although disposable blood taking needle is designed to be discarded after single use, but in actual operation, there can be the case of repeatedly using needle head.This not only violates the use regulation of medical instrument, but also greatly increases the risk of infection. INVENTION CONTENTS

[0005] The utility model aims at providing a blood taking needle of adjustable puncture depth to solve the problems in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme: a blood taking needle of adjustable puncture depth, including needle cylinder, needle head and telescopic sleeve, the inside of needle cylinder is provided with needle cavity, needle head is arranged in needle cavity, and the needle tip of needle head extends to the outside of needle cylinder, the outer surface of needle cylinder is provided with external thread, the outer surface of external thread is screw-connected with internal thread knob, the inside of internal thread knob is rotatably installed with adjusting rod, and the end of adjusting rod is inserted into needle cavity and is connected with needle head.The inside of needle cylinder is provided with annular cavity, and telescopic sleeve is arranged in annular cavity, the inner wall of annular cavity is provided with limiting slot A, the inside of limiting slot A is provided with limiting block A, and the end of limiting block A is connected with the outer surface of telescopic sleeve.The inside of annular cavity is provided with spring A, and the two ends of spring A are respectively abutted with the top wall of annular cavity and telescopic sleeve.The lower end of needle cylinder is provided with protective cap.

[0007] Further, the surface of telescopic sleeve is provided with insertion hole, the side wall of annular cavity is provided with mounting slot A, the inside of mounting slot A is provided with insertion mechanism, insertion mechanism is inserted and matched with insertion hole, and insertion mechanism is arranged below insertion hole.

[0008] Further, the plug-in mechanism comprises a sliding rod installed in the installation groove A, an installation block is slidably installed on the outer surface of the sliding rod, a jacking rod is arranged in the installation block, a spring B is arranged in the installation block, and the two ends of the spring B are respectively in abutment with the inner wall of the installation block and the jacking rod.

[0009] Further, the stretching mechanism comprises magnet pieces arranged on the upper and lower two side faces of the installation block and the inner walls of the upper and lower two sides of the installation groove A, the magnet pieces on the lower surface of the installation block and the lower inner wall of the installation groove A are magnetically matched, and the magnet pieces on the upper surface of the installation block and the upper inner wall of the installation groove A are magnetically matched.

[0010] Further, the end of the jacking rod is provided with a ball.

[0011] Further, the inner wall of the needle cavity is provided with a limiting groove B, a limiting block B is arranged in the limiting groove B, and the end of the limiting block B is connected with the adjusting rod.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. By rotating the internal thread knob, the needle head is lifted under the action of the threaded connection, and the length of the needle head extending outward is adjusted through the adjusting rod, so that the puncture depth is adjusted, and the individual needs of different skin thicknesses are met.

[0014] 2. By arranging the plug-in mechanism and the stretching mechanism, when the telescopic sleeve is retracted into the annular cavity, the installation block is pulled up and positioned at the current position, when the telescopic sleeve is popped out and reset, the jack is just corresponding to the jacking rod, at this time, the jacking rod can be automatically inserted into the jack, and then the telescopic sleeve is fixed and cannot slide upward again, so that the telescopic sleeve can only be telescoped once, thereby avoiding repeated use. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 3 It is Figure 2 the enlarged schematic diagram of A.

[0018] In the figure: 100, needle cylinder; 101, needle cavity; 102, needle head; 103, external thread; 104, internal thread knob; 105, adjusting rod; 106, annular cavity; 107, telescopic sleeve; 108, limiting groove A; 109, limiting block A; 110, spring A; 111, protective cap; 200, insertion hole; 201, mounting groove A; 300, insertion mechanism; 301, mounting block; 302, top rod; 303, spring B; 304, sliding rod; 400, stretching mechanism; 401, magnet sheet; 402, mounting groove B; 403, fixed rod; 404, spring C; 500, ball; 600, limiting groove B; 601, limiting block B. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] In the description of the embodiments of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "connection", "installation" should be understood in a broad sense, for example, "connection" can be detachable connection, or can be non-detachable connection, can be direct connection, or indirect connection through intermediate medium. In addition, "communication" can be direct communication, or indirect communication through intermediate medium. Among them, "fixing" means connecting with each other and the relative position relationship after connection does not change. The orientation language mentioned in the embodiments of the utility model, for example, "inner", "outer", "top", "bottom" and the like, is only the direction of the drawing, therefore, the orientation language used is for better, clearer description and understanding of the embodiments of the utility model, and is not indicative or implied that the indicated device or element must have a particular orientation, structure and operation, therefore, it cannot be understood as a limitation on the embodiments of the utility model.

[0021] In the embodiments of the utility model, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features.

[0022] Please refer to Figures 1-3 The utility model provides an embodiment:

[0023] The application discloses a blood taking needle with adjustable puncture depth, which comprises a needle cylinder 100, a needle head 102 and a telescopic sleeve 107, the inside of the needle cylinder 100 is provided with a needle cavity 101, the needle head 102 is arranged in the needle cavity 101, the needle tip of the needle head 102 extends to the outside of the needle cylinder 100, and the outer surface of the needle cylinder 100 is provided with external threads 103. The outer surface of the external threads 103 is threadedly connected with internal threads knobs 104, the inside of the internal threads knobs 104 is rotatably provided with an adjusting rod 105, the end of the adjusting rod 105 is inserted into the needle cavity 101 and connected with the needle head 102, when the internal threads knobs 104 are rotated, the needle head 102 can be lifted and lowered through the adjusting rod 105 to adjust the puncture depth. The inside of the needle cylinder 100 is provided with an annular cavity 106, the telescopic sleeve 107 is arranged in the annular cavity 106, the telescopic sleeve 107 is sleeved on the outside of the needle head 102 and can protect the needle head 102 to avoid accidental injury, and the telescopic sleeve 107 is made of transparent material, the length of the needle head 102 can be observed from the outside, and the puncture depth can be adjusted conveniently. The inner wall of the annular cavity 106 is provided with a limiting groove A 108, the inside of the limiting groove A 108 is provided with a limiting block A 109, the end of the limiting block A 109 is connected with the outer surface of the telescopic sleeve 107, the limiting groove A 108 and the limiting block A 109 limit the telescopic sleeve 107 to prevent the telescopic sleeve 107 from being separated from the annular cavity 106. The inside of the annular cavity 106 is provided with a spring A 110, the two ends of the spring A 110 are respectively abutted with the top wall of the annular cavity 106 and the telescopic sleeve 107, the telescopic sleeve 107 is pushed by the spring A 110 to ensure that the telescopic sleeve 107 can be stably sleeved on the outside of the needle head 102 for protection, and the telescopic sleeve 107 can be reset after puncture. The lower end of the needle cylinder 100 is sleeved with a protective cap 111, the protective cap 111 plays a protective role and can prevent the telescopic sleeve 107 from being retracted due to accidental touch.

[0024] See Figure 2 and Figure 3, the surface of the telescopic sleeve 107 is provided with a socket 200, the side wall of the annular cavity 106 is provided with a mounting groove A201, the inside of the mounting groove A201 is provided with a plug-in mechanism 300, the plug-in mechanism 300 is plugged with the socket 200, and the plug-in mechanism 300 is arranged below the socket 200. Because the plug-in mechanism 300 is below the socket 200, the telescopic sleeve 107 can slide up without being blocked, and the blood sampling puncture requirement is completed. The plug-in mechanism 300 includes a sliding rod 304 mounted in the mounting groove A201, the outer surface of the sliding rod 304 is slidably mounted with a mounting block 301, the inside of the mounting block 301 is provided with a top rod 302, the inside of the mounting block 301 is provided with a spring B 303, and the two ends of the spring B 303 are respectively abutted with the inner wall of the mounting block 301 and the top rod 302. The telescopic sleeve 107 and the mounting block 301 are provided with a stretching mechanism 400, which can drive the plug-in mechanism 300 to rise to a height corresponding to the socket 200 after the telescopic sleeve 107 slides up. The end of the top rod 302 is tightly abutted with the outer surface of the telescopic sleeve 107 by the pushing force of the spring B 303. When the mounting block 301 is driven to move upward by the stretching mechanism 400, the top rod 302 corresponds to the socket 200 when the telescopic sleeve 107 slides down and extends outward again. At this time, under the pushing of the spring B 303, the top rod 302 can be automatically inserted into the socket 200 to fix the telescopic sleeve 107. The stretching mechanism 400 includes a magnet piece 401 arranged on the upper and lower sides of the mounting block 301 and the inner walls of the mounting groove A201, and the magnet pieces 401 on the lower surface of the mounting block 301 and the lower inner wall of the mounting groove A201 are magnetically matched, and the magnet pieces 401 on the upper surface of the mounting block 301 and the upper inner wall of the mounting groove A201 are magnetically matched. The side wall of the annular cavity 106 is provided with a mounting groove B402, which is communicated with the mounting groove A201, and the outer surface of the telescopic sleeve 107 is provided with a fixing rod 403, the lower surface of the fixing rod 403 is connected with a spring C 404, and the end of the spring C 404 is connected with the upper surface of the mounting block 301. By the magnetic attraction of the magnet piece 401, the mounting block 301 can be fixed on the lower inner wall of the mounting groove A201 when the needle 102 is not used. When the needle 102 is used for puncture and the telescopic sleeve 107 slides up, the telescopic sleeve 107 pulls the spring C 404 upward through the fixing rod 403. When the spring C 404 is stretched to a certain length, the generated tension will be greater than the magnetic attraction of the magnet piece 401, thereby driving the mounting block 301 to slide upward along the surface of the sliding rod 304, so that the mounting block 301 is fixed on the upper inner wall of the mounting groove A201 by the magnetic attraction of the magnet piece 401. Subsequently, when the telescopic sleeve 107 slides down and extends outward again, the top rod 302 is just aligned with and inserted into the socket 200.The end of the top rod 302 is provided with a ball 500, and the ball 500 can reduce the friction between the outer surface of the telescopic sleeve 107 and the end of the top rod 302, so as to avoid the situation that the friction generated when the telescopic sleeve 107 slides downward causes the top rod 302 to move downward.

[0025] Please refer to Figure 2 The inner wall of the needle cavity 101 is provided with a limiting groove B600, the inside of the limiting groove B600 is provided with a limiting block B601, the end of the limiting block B601 is connected with the adjusting rod 105, when the needle 102 is adjusted to the maximum or minimum puncture depth, the limiting block B601 will be in contact with the inner wall of the two ends of the limiting groove B600, so as to prevent the needle 102 from continuing to move, thereby playing a limiting role, and ensuring that the puncture depth is adjusted within a safe and effective range.

[0026] The specific working process and working principle of the device are as follows.

[0027] In use, first open the protective cap 111, then rotate the inner threaded knob 104, and under the action of threaded connection, the telescopic sleeve 107 is lifted, and then the needle 102 is lifted through the adjusting rod 105, the puncture length of the needle 102 is adjusted, then the telescopic sleeve 107 is pressed on the blood collection site, and in the pressing process, the telescopic sleeve 107 is retracted into the annular cavity 106 and compresses the spring A110, so that the needle 102 can puncture the skin.

[0028] During the puncture process, as the telescopic sleeve 107 slides upward, it pulls the spring C404 upward through the fixed rod 403, when the spring C404 is stretched to a certain length, the generated pulling force will be greater than the magnetic attraction force of the magnet piece 401, and then the mounting block 301 is driven to slide upward along the surface of the slide rod 304, so that the mounting block 301 is fixed on the upper inner wall of the mounting groove A201 through the magnetic attraction of the magnet piece 401.

[0029] After the puncture is completed, the needle 102 is pulled out of the patient's body, and the telescopic sleeve 107 is pushed out again by the spring A110, at this time, the top rod 302 corresponds to the insertion hole 200, under the pushing of the spring B303, the top rod 302 can be automatically inserted into the insertion hole 200 to fix the telescopic sleeve 107, so that the telescopic sleeve 107 cannot slide upward, thereby avoiding the situation of repeated use.

[0030] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. An adjustable puncture depth blood taking needle, comprising a needle cylinder (100), a needle head (102) and a telescopic sleeve (107), characterized in that: an internal part of the needle cylinder (100) is provided with a needle cavity (101), the needle head (102) is arranged in the needle cavity (101), and a needle tip of the needle head (102) extends to an outside of the needle cylinder (100), an external surface of the needle cylinder (100) is provided with an external thread (103), an internal thread knob (104) is threadedly connected to the external surface of the external thread (103), an adjusting rod (105) is rotatably arranged in an internal part of the internal thread knob (104), and an end of the adjusting rod (105) is inserted into the needle cavity (101) and connected with the needle head (102); an internal part of the needle cylinder (100) is provided with an annular cavity (106), the telescopic sleeve (107) is arranged in the annular cavity (106), an internal wall of the annular cavity (106) is provided with a limiting groove A (108), a limiting block A (109) is arranged in the limiting groove A (108), and an end of the limiting block A (109) is connected with an external surface of the telescopic sleeve (107); the annular cavity (106) is provided with a spring A (110), and two ends of the spring A (110) are respectively abutted against a top wall of the annular cavity (106) and the telescopic sleeve (107); a lower end of the needle cylinder (100) is provided with a protective cap (111).

2. The adjustable puncture depth blood taking needle according to claim 1, characterized in that: an external surface of the telescopic sleeve (107) is provided with a insertion hole (200), a side wall of the annular cavity (106) is provided with a mounting groove A (201), the mounting groove A (201) is provided with an insertion mechanism (300), the insertion mechanism (300) is insertedly matched with the insertion hole (200), and the insertion mechanism (300) is arranged below the insertion hole (200).

3. The adjustable puncture depth blood taking needle according to claim 2, characterized in that: the insertion mechanism (300) comprises a sliding rod (304) arranged in the mounting groove A (201), an external surface of the sliding rod (304) is slidably provided with a mounting block (301), an internal part of the mounting block (301) is provided with a jacking rod (302), an internal part of the mounting block (301) is provided with a spring B (303), and two ends of the spring B (303) are respectively abutted against an internal wall of the mounting block (301) and the jacking rod (302); a stretching mechanism (400) is arranged between the telescopic sleeve (107) and the mounting block (301), and the stretching mechanism (400) can drive the insertion mechanism (300) to rise to a height corresponding to the insertion hole (200) after sliding on the telescopic sleeve (107).

4. The adjustable puncture depth blood taking needle according to claim 3, characterized in that: The stretching mechanism (400) includes magnet pieces (401) arranged on the upper and lower sides of the mounting block (301) and the inner walls of the upper and lower sides of the mounting groove A (201), and the magnet pieces (401) on the lower surface of the mounting block (301) and the inner wall of the lower side of the mounting groove A (201) are magnetically matched, and the magnet pieces (401) on the upper surface of the mounting block (301) and the inner wall of the upper side of the mounting groove A (201) are magnetically matched; The sidewall of the annular cavity (106) is provided with a mounting groove B (402), the mounting groove B (402) is communicated with the mounting groove A (201), the outer surface of the telescopic sleeve (107) is provided with a fixing rod (403), the lower surface of the fixing rod (403) is connected with a spring C (404), and the end of the spring C (404) is connected with the upper surface of the mounting block (301).

5. The blood taking needle of claim 3, wherein: The end of the top rod (302) is provided with a ball (500).

6. The blood taking needle of claim 5, wherein: The inner wall of the needle cavity (101) is provided with a limiting groove B (600), the inside of the limiting groove B (600) is provided with a limiting block B (601), and the end of the limiting block B (601) is connected with the adjusting rod (105).

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