Leaf spring for medical instrument

Abstract

The utility model discloses a leaf spring for medical equipment, which comprises a fixed end, a support action end and an elastic bending part arranged between the fixed end and the support action end, the fixed end comprises a first support part and an elastic abutting part, the elastic bending part comprises a first oblique arm, a transition surface and a second oblique arm which are integrally arranged, and the first oblique arm is connected with the transition surface. A strip-shaped groove is further formed in the elastic bending part, the supporting action end comprises a second supporting part parallel to the horizontal plane, a hollow reinforcing rib is arranged in the middle of the second supporting part, and a bending reinforcing part is arranged at one end of the second supporting part. According to the scheme, the working stability, compression resistance and telescopic sensitivity of the leaf spring can be improved, meanwhile, by limiting the bending angle range of the elastic bending part, the telescopic variable of the elastic bending part can be well limited, and therefore precise control is achieved.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a leaf spring for medical equipment. Background Art

[0002] Medical devices with high requirements for miniaturization, especially those that are carried or left in the body, need to provide elastic parts that can adapt to working in a small space. At the same time, medical devices have extremely high requirements for no foreign body sensation, safety and comfort. Therefore, elastic parts for medical devices must also have the characteristics of high sensitivity, good stability and good elasticity. Existing leaf springs for medical devices, such as the invention patent with application publication number CN111588937A, provide an implantable drug delivery device and a fully covered butterfly-shaped non-destructive needle for needle puncture prevention, wherein a V-shaped metal spring is used as a lock switch, which is used to close the lower through hole of the anti-acupuncture box when the needle tip of the needle tube is retracted into the anti-acupuncture box to achieve the anti-acupuncture function. The metal spring has a simple structure and can be used in a small space, but the stability of the V-shaped structure is poor, and it is easy to cause false triggering or trigger failure due to unstable fixation of the metal spring. In addition, the connection bend of the V-shaped metal spring is a sharp corner, which will affect the elasticity of the metal spring on the one hand, and easily damage the inner wall of the shell on the other hand.

[0003] In addition, the expansion and contraction performance and stability of the leaf spring also depend on the various reinforcement structures and hole and slot structures of the leaf spring. The reinforcement structures and hole and slot structures will affect the weight, compressive performance and expansion and contraction sensitivity of the location of the structure. For example, when the hole and slot structure occupies a large area, the compressive performance of this part is large, and it cannot provide the corresponding reaction force after deformation, which makes it impossible to achieve the anti-needle puncture function; when the hole and slot structure area is small, the elasticity of the leaf spring is poor and the sensitivity decreases. Similarly, when the weight or volume of the reinforcement structure is large, it will also affect the sensitivity of the leaf spring. Therefore, it is necessary to accurately control the parameters of various reinforcement structures and hole and slot structures on the leaf spring. At the same time, when the contact area between the leaf spring and the shell is too large, the friction resistance will increase, resulting in a decrease in expansion and contraction sensitivity. Utility Model Content

[0004] Therefore, in order to solve the above problems, the utility model provides a leaf spring for medical equipment.

[0005] The utility model is realized by the following technical solutions:

[0006] A leaf spring for medical equipment comprises a fixed end, a supporting end and an elastic bent portion arranged between the fixed end and the supporting end, the fixed end comprising a first supporting portion arranged parallel to a horizontal plane, one end of the first supporting portion is connected to the elastic bent portion, and the other end is provided with an elastic abutting portion, the elastic abutting portion comprising a first abutting portion vertically bent from the end of the first supporting portion and a second abutting portion bent downward from the top of the first abutting portion toward the direction of the elastic bent portion, the angle between the second abutting portion and the first abutting portion is an acute angle, and the angle of the angle can be adjusted by adjusting the compression amount of the second abutting portion, the elastic bent portion comprises a first oblique arm, a transition surface and a second oblique arm arranged integrally, the transition surface is an arc surface arranged between the first oblique arm and the second oblique arm, The first oblique arm and the second oblique arm are at the same height and have the same inclination angle. A strip groove is also provided on the elastic bending portion, and the strip groove extends from the first oblique arm to the second oblique arm, and the length of the strip groove in the first oblique arm is the same as its length in the second oblique arm. The ratio of the width of the strip groove to the width of the elastic bending portion is 1:3, and the ratio of the length of the strip groove to the width of the elastic bending portion is 4:3. The supporting action end includes a second supporting portion parallel to the horizontal plane, a hollow reinforcing rib is provided in the middle portion of the second supporting portion, and the lower surface of the hollow reinforcing rib protrudes upward, one end of the second supporting portion is connected to the elastic bending portion, and the other end is bent to provide a bending reinforcement portion, the bottom of the bending reinforcement portion is in contact with the upper surface of the second supporting portion, and the bending reinforcement portion and the hollow reinforcing rib are spaced apart.

[0007] Preferably, the ratio of the bending R angle of the elastic bending portion to its thickness is 6-10:1.

[0008] Preferably, the bending angle of the elastic bending portion is 55°-110°.

[0009] Preferably, the ratio of the length of the first oblique arm and the second oblique arm to their thickness is 25:1.

[0010] Preferably, the connection between the elastic bending portion and the fixed end and the connection between the elastic bending portion and the supporting end are both connected by rounded corners.

[0011] Preferably, the bending portion between the second abutting portion and the first abutting portion is curved.

[0012] Preferably, the hollow reinforcing rib is protrudingly disposed on the upper surface of the second supporting portion, the width of the hollow reinforcing rib is smaller than the width of the strip-shaped groove, and the length of the hollow reinforcing rib is smaller than the length of the strip-shaped groove.

[0013] Preferably, the hollow reinforcing rib includes a semi-cylindrical middle section and arc sections arranged at both ends of the middle section, and the arc sections at both ends of the middle section are 1 / 4 spheres with the same radius as the middle end.

[0014] Preferably, the thickness of the elastic bending portion is the same as the thickness of each structure on the fixed end and the supporting end, and the widths of the elastic bending portion, the fixed end and the supporting end are the same.

[0015] Preferably, the fixed end, the supporting end and the elastic bending portion are integrally stamped and formed.

[0016] The beneficial effects of the technical solution of the utility model are mainly reflected in:

[0017] 1. The elastic bending part is retractable. The fixed ends and supporting ends at both ends of the elastic bending part can provide support for the telescopic effect of the elastic bending part, thereby improving the working stability of the leaf spring. In addition, by strictly limiting the length and width of the strip groove, the compressive resistance and telescopic sensitivity of the elastic bending part can be better limited. At the same time, by limiting the bending angle range of the elastic bending part, the telescopic variable of the elastic bending part can be better limited, thereby achieving precise control. On the one hand, it ensures that the reaction force exerted by the leaf spring on the needle tube will not cause damage to the needle tube, and on the other hand, it ensures the sensitivity of the telescopic extension of the leaf spring.

[0018] 2. The angle between the first abutting portion and the second abutting portion can be adjusted by adjusting the compression amount of the second abutting portion in the elastic abutting portion, so that the elastic abutting portion can realize the function of elastic snap. When the elastic abutting portion is clamped in the shell, the second abutting portion is compressed and abuts against the inner wall of the shell, thereby applying a reaction force to the inner wall of the shell to prevent the elastic abutting portion from moving or shaking during operation, thereby improving the firmness and stability of the connection between the elastic abutting portion and the shell.

[0019] 3. The bottom of the hollow reinforcing rib is raised, and the size relationship between the hollow reinforcing rib and the strip groove is limited. Therefore, when the elastic bending part expands and contracts to drive the support end to move, the contact area between the bottom of the support end and the shell is reduced. On the one hand, the friction resistance between the support end and the shell can be reduced. On the other hand, the use of hollow reinforcing ribs can reduce the weight of the support end, thereby enhancing the local strength and limiting effect of the support end while improving the sensitivity of the movement of the support end. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a reference diagram of the usage status of leaf springs for medical devices;

[0021] Figure 2 It is a stereoscopic image of a leaf spring for medical devices in a first perspective;

[0022] Figure 3 is a stereogram of a leaf spring for medical devices at a second viewing angle;

[0023] Figure 4 yes Figure 3 A magnified view of part A;

[0024] Figure 5 A cross-sectional view of a leaf spring for medical devices;

[0025] Figure 6 yes Figure 5 Magnified view of part B. DETAILED DESCRIPTION

[0026] In order to make the purpose, advantages and features of the utility model more clearly and in detail, the following preferred embodiments are illustrated and explained through non-limiting descriptions. This embodiment is only a typical example of the application of the technical solution of the utility model. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the utility model.

[0027] At the same time, it is stated that in the description of the scheme, it should be noted that the directions or positional relationships indicated by the terms "center", "up", "down", "left", "right", "front", "back", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0028] In addition, the terms "first" and "second" in this solution are only used for descriptive purposes and cannot be understood as indicating or implying the order of importance, or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In this utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] The utility model discloses a leaf spring for medical equipment, comprising a fixed end 1, a supporting end 3 and an elastic bending portion 2 arranged between the fixed end 1 and the supporting end 3. Figure 1 As shown, in one embodiment, the usage scenario of the leaf spring is an anti-needle puncture structure for a non-damageable needle, and the fixed end 1 is fixed in the shell. When the puncture needle (located on the left side of the fixed end, not shown in the figure) is extended, the supporting end 3 of the leaf spring abuts against the outer periphery of the needle tube. At this time, the elastic limiting part contracts. When the puncture needle is retracted and leaves the supporting end 3, the abutting force on the supporting end 3 disappears. At this time, the elastic limiting part releases and drives the supporting end 3 to move and cover the through hole for passing the puncture needle, thereby achieving the anti-needle puncture effect. The leaf spring for medical devices can also be applied to other medical devices and usage scenarios, which will not be elaborated here.

[0030] like Figure 2 , Figure 3 , Figure 5As shown, the fixed end 1 includes a first supporting portion 101 arranged parallel to the horizontal plane, one end of the first supporting portion 101 is connected to the elastic bending portion 2, and the other end is provided with an elastic abutting portion, which is used to abut and fix with a limiting structure arranged on the inner wall of the shell, and the elastic abutting portion includes a first abutting portion 102 vertically bent from the end of the first supporting portion 101 and a second abutting portion 103 bent downward from the top of the first abutting portion 102 toward the direction of the elastic bending portion 2, the angle between the second abutting portion 103 and the first abutting portion 102 is an acute angle, and the angle of the angle can be adjusted by adjusting the compression amount of the second abutting portion 103, and the angle between the first abutting portion 102 and the second abutting portion 103 can be adjusted by adjusting the compression amount of the second abutting portion 103, so that the elastic abutting portion can realize the function of elastic buckle, which has Specifically, when the elastic abutting portion is clamped in the shell, the second abutting portion 103 is compressed and deformed and abuts against the limiting structure on the inner wall of the shell, thereby applying a reaction force to the inner wall of the shell to prevent the elastic abutting portion from moving or shaking during operation, thereby improving the firmness and stability of the connection between the elastic abutting portion and the shell. In addition, the second abutting portion 103 is arranged at an angle and the angle between the second abutting portion 103 and the first abutting portion 102 is an acute angle. When installing the leaf spring, the connection between the first abutting portion 102 and the second abutting portion 103 is first extended into the limiting structure provided on the inner wall of the shell. The connection is the narrowest part of the elastic abutting portion, so it is convenient to install the elastic abutting portion in the limiting structure provided on the inner wall of the shell. In a preferred embodiment, the bending part between the second abutting portion 103 and the first abutting portion 102 is an arc-shaped bending, which further facilitates the installation of the elastic abutting portion.

[0031] like Figure 1-Figure 5 As shown, the elastic bending portion 2 includes an integrally arranged first oblique arm 201, a transition surface 203 and a second oblique arm 202, the transition surface 203 is an arc surface arranged between the first oblique arm 201 and the second oblique arm 202, the first oblique arm 201 and the second oblique arm 202 are at the same height and have the same inclination angle, and a strip groove 204 is also arranged on the elastic bending portion 2, the strip groove 204 starts from the first oblique arm 201, passes through the transition surface 203 and extends to the second oblique arm 202, and the length of the strip groove in the first oblique arm 201 is the same as that in the second oblique arm 202, on the one hand, it ensures that the two ends of the elastic bending portion 2 are structurally symmetrical, and on the other hand, the equal height of the first oblique arm 201 and the second oblique arm 202 can ensure that the bottom of the fixed end 1 and the supporting end 3 are located on the same plane, thereby ensuring the stability of the elastic bending portion 2 during the extension and retraction process.

[0032] The ratio of the width of the strip groove 204 to the width of the elastic bending part 2 is 1:3, and the ratio of the length of the strip groove 204 to the width of the elastic bending part 2 is 4:3. By accurately limiting the length and width of the strip groove 204, the expansion and contraction amount of the elastic bending part 2 can be accurately limited, on the one hand, ensuring the compressive strength of the elastic bending part 2, on the other hand, ensuring the sensitivity of the elastic bending part 2.

[0033] like Figure 3-Figure 6 As shown, the support end 3 includes a second support portion 301 parallel to the horizontal plane, and a hollow reinforcing rib 302 is provided in the middle of the second support portion 301. The lower surface of the hollow reinforcing rib 302 is convex upward, thereby ensuring that the lower surface of the hollow reinforcing rib 302 does not contact the inner wall of the shell, thereby reducing the friction resistance with the inner wall of the shell during the movement of the support end 3, ensuring that the support end 3 can quickly cover the through hole after the needle tube is recovered. In addition, compared with the solid reinforcing rib, the weight of the support end 3 can be reduced, further In order to improve the activity sensitivity of the supporting end 3, one end of the second supporting part 301 is connected to the elastic bending part 2, and the other end is bent to provide a bending reinforcement part 303. The setting of the reinforcement part can increase the contact area with the needle tube on the one hand, thereby avoiding damage to the needle tube, and on the other hand, improve the compressive strength of the contact part between the leaf spring and the needle tube. The bottom of the bending reinforcement part 303 is in contact with the upper surface of the second supporting part 301, and the bending reinforcement part 303 and the hollow reinforcement rib 302 are spaced apart to avoid mutual interference.

[0034] In some embodiments, the ratio of the bending R angle of the elastic bending portion 2 to its thickness is 6-10:1, and the bending angle of the elastic bending portion 2 is 55°-110°. By limiting the bending R angle of the elastic bending portion 2, the telescopic deformation of the elastic bending portion 2 is further accurately limited.

[0035] In some embodiments, the ratio of the length of the first oblique arm 201 and the second oblique arm 202 to their thickness is 25:1, which further limits the height of the elastic bending portion 2 as well as the compressive strength and telescopic deformation of the elastic bending portion 2 .

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, in some embodiments, the connection between the elastic bending portion 2 and the fixed end 1 and the connection between the elastic bending portion 2 and the supporting end 3 are both connected by rounded corners, which can further improve the compressive resistance of the connection.

[0037] like Figure 3-Figure 6As shown, in some embodiments, the hollow reinforcing rib 302 is protruded from the upper surface of the second support portion 301, the width of the hollow reinforcing rib 302 is smaller than the width of the strip groove 204, the length of the hollow reinforcing rib 302 is smaller than the length of the strip groove 204, and the hollow reinforcing rib 302 can have various shapes. In a preferred embodiment, the hollow reinforcing rib 302 includes a semi-cylindrical middle section 3021 and arc sections 3022 arranged at both ends of the middle section 3021, and the arc sections 3022 at both ends of the middle section 3021 are 1 / 4 spheres with the same radius as the middle end.

[0038] In some embodiments, the thickness of the elastic bending portion 2 is the same as the thickness of the various structures on the fixed end 1 and the supporting end 3, and the widths of the elastic bending portion 2, the fixed end 1 and the supporting end 3 are the same. In a preferred embodiment, the fixed end 1, the supporting end 3 and the elastic bending portion 2 are stamped integrally, and the various structures on the leaf spring are preferably formed by integral stamping and continuous processing using a piece of cold-rolled steel plate.

[0039] There are many implementation methods of the utility model, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the utility model.

Claims

1. A leaf spring for medical equipment, characterized in that: The cam is a first support portion provided at the bottom of the support member, and the second support portion is a second support portion provided at the bottom of the support member, wherein the first support portion has a first end and a second end. The elastic bending portion is at the same height and has the same inclination angle as the second oblique arm, and a strip groove is further provided on the elastic bending portion, the strip groove extends from the first oblique arm to the second oblique arm, and the length of the strip groove in the first oblique arm is the same as its length in the second oblique arm, the ratio of the width of the strip groove to the width of the elastic bending portion is 1:3, and the ratio of the length of the strip groove to the width of the elastic bending portion is 4:3, the supporting action end includes a second supporting portion parallel to the horizontal plane, a hollow reinforcement rib is provided in the middle portion of the second supporting portion, the lower surface of the hollow reinforcement rib protrudes upward, one end of the second supporting portion is connected to the elastic bending portion, and the other end is bent to provide a bending reinforcement portion, the bottom of the bending reinforcement portion is in contact with the upper surface of the second supporting portion, and the bending reinforcement portion and the hollow reinforcement rib are spaced apart.

2. The leaf spring for medical equipment according to claim 1, characterized in that: The ratio of the bending R angle of the elastic bending portion to its thickness is 6-10:

1.

3. The leaf spring for medical equipment according to claim 1, characterized in that: The bending angle of the elastic bending portion is 55°-110°.

4. The leaf spring for medical equipment according to claim 1, characterized in that: The ratio of the length of the first oblique arm and the thickness of the second oblique arm is 25:

1.

5. The leaf spring for medical equipment according to claim 1, characterized in that: The connection between the elastic bending portion and the fixed end and the connection between the elastic bending portion and the supporting end are both connected through rounded corners.

6. The leaf spring for medical equipment according to claim 1, characterized in that: The bending portion between the second abutting portion and the first abutting portion is bent in an arc shape.

7. The leaf spring for medical equipment according to claim 1, characterized in that: The hollow reinforcing rib is protrudingly arranged on the upper surface of the second supporting portion, the width of the hollow reinforcing rib is smaller than the width of the strip-shaped groove, and the length of the hollow reinforcing rib is smaller than the length of the strip-shaped groove.

8. The leaf spring for medical equipment according to claim 7, characterized in that: The hollow reinforcing rib comprises a semi-cylindrical middle section and arc sections arranged at both ends of the middle section, and the arc sections at both ends of the middle section are 1 / 4 spheres with the same radius as the middle end.

9. The leaf spring for medical equipment according to claim 1, characterized in that: The thickness of the elastic bending portion is the same as the thickness of each structure on the fixed end and the supporting end, and the width of the elastic bending portion, the fixed end and the supporting end is the same.

10. The leaf spring for medical equipment according to claim 1, characterized in that: The fixed end, the supporting end and the elastic bending portion are integrally stamped and formed.

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