CN210144685U

CN210144685U - Bone biopsy extractor

Info

Publication number: CN210144685U
Application number: CN201920758058.0U
Authority: CN
Inventors: 李晶; 沈建霞; 刘崇兵
Original assignee: Double Medical Technology Inc
Current assignee: Double Medical Technology Inc
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-03-17
Anticipated expiration: 2029-05-24

Abstract

The utility model relates to a bone biopsy extractor, which comprises a hollow inner rod body, wherein the rear end of the inner rod body is fixedly provided with an inner rod handle body, the inner rod handle body is provided with a hole for abdicating the rear end of the inner rod body, and the side wall of the front end of the inner rod body is provided with a first window which is arranged along the axial line direction of the inner rod body in an extending way; the utility model provides a hollow outer rod body, have the second window that corresponds the setting with first window on the lateral wall of the front end of the outer rod body, the second window is provided with the cutting blade of side direction cutting on the edge of outer rod body axis direction to and an ejector pin, the front end of ejector pin is the sharp-pointed part, and this ejector pin can stretch into to the front end from the rear end of interior rod body to improve the problem that current bone biopsy instrument gets the bone success rate low.

Description

Bone biopsy extractor

Technical Field

The utility model relates to the field of medical equipment, specifically relate to a bone biopsy extractor.

Background

Bone biopsy extractors are tools used in the extraction of bone lesion tissue samples prior to a planned surgery by a patient, making a definitive diagnosis prior to the surgery. The existing bone biopsy extractor generally comprises a bone taking outer cylinder, wherein the front end part of the bone taking outer cylinder is provided with cutting teeth, when the bone taking outer cylinder is rotated, the cutting teeth at the front end cut the bone to be cylindrical, and the cut cancellous bone is accommodated in a bone accommodating cavity of the bone taking outer cylinder.

Get bone device as disclosed in CN104739484A, put including the barrel, the locating lever and get the bone shovel body, the tip of barrel front end is equipped with the sawtooth body of a plurality of circumference distributions, the barrel rear end is equipped with torsion mechanism, the barrel has the axial and link up and can insert the locating lever respectively and get the central channel of bone shovel body, the locating lever front end has the location awl point that exposes in the barrel front end when the locating lever inserts in central channel, the locating lever rear end has the atress portion that is used for bearing outside effort, it includes the body of rod and sets up the shovel head that just has the bone storage portion at body of rod front end to get the bone shovel body.

Such bone harvesting devices have difficulty retaining the sample during removal from the tissue, and thus the success rate of obtaining a satisfactory sample in a single insertion into the bone is relatively low, requiring multiple sampling operations, which results in repeated pain to the patient. It is therefore desirable to provide a tool that is reliable in use and that removes a sufficient amount of bone tissue.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bone biopsy extractor, this bone biopsy extractor single sample can take out sufficient bone tissue volume, can effectively improve the problem that current bone biopsy instrument gets the bone success rate low.

The specific scheme is as follows:

a bone biopsy extractor comprises a bone biopsy taking device,

the inner rod assembly comprises a hollow inner rod body, the two ends of the inner rod body are respectively a front end and a rear end, the front end of the inner rod body is a closed end, the rear end of the inner rod body is an open end, an inner rod handle body is fixedly arranged at the rear end of the inner rod body, a abdicating hole which is aligned with the rear end of the inner rod body is formed in the inner rod handle body, and a first window which extends along the axial line direction of the inner rod body is formed in the side wall of the front end of the inner rod body;

the outer rod assembly comprises a hollow outer rod body, the two ends of the outer rod body are respectively a front end and a rear end, the front end of the outer rod body is a closed end, the rear end of the outer rod body is an open end, a second window which corresponds to the first window is arranged on the side wall of the front end of the outer rod body, a cutting blade for lateral cutting is arranged on the edge of the second window along the axial line direction of the outer rod body, the outer rod body is sleeved on the periphery of the inner rod body, and the outer rod body can rotate around the inner rod body, so that the cutting blade can cut bone tissues and fall into the inner rod body from the first window;

the ejector rod component comprises an ejector rod, the two ends of the ejector rod are respectively a front end and a rear end, the front end of the ejector rod is a sharp part, and the ejector rod can extend into the front end from the rear end of the inner rod body to take out bone tissues in the inner rod body.

In one embodiment, the cutting blade on the outer rod body is a tapered variable diameter cutting blade with a small front end and a large rear end.

In one embodiment, the cutting blade is divided into a plurality of sub-blades along the axial direction of the outer rod body, and a discharge gap is arranged at the joint of two adjacent sub-blades.

In one embodiment, when the outer rod body rotates to a specific angle relative to the inner rod body, the outer peripheral wall at the first window of the inner rod body can shield the second window on the outer rod body.

Furthermore, the peripheral wall of the inner rod body at the first window is in an inferior arc shape.

In one embodiment, the front end of the outer rod body is a drill bit part with an axial cutting blade.

Furthermore, a liquid discharge hole which is axially arranged along the outer rod body and communicated with the inner cavity of the outer rod body is arranged in the middle of the drill bit part.

In an embodiment, a rotating cap is fixedly arranged at the rear end of the outer rod body, an elastic buckle is fixedly arranged at the rear end of the inner rod body, and a limiting portion matched with the elastic buckle is arranged in the rotating cap.

In an embodiment, the front ends of the inner rod body and the outer rod body are respectively provided with a limiting shaft shoulder which are matched with each other.

In one embodiment, a push rod handle body is fixedly arranged at the rear end of the push rod, the push rod handle body and the inner rod handle body are respectively provided with a locking piece and a locking groove, and when the locking piece is positioned in the locking groove, the push rod and the inner rod body are axially fixed.

The utility model provides a bone biopsy extractor compares with prior art and has following advantage: the utility model provides a bone biopsy extractor adopts the mode that the bone tissue was got in the side direction cutting, can guarantee that the bone tissue cuts off completely, and the bone tissue storage that the cutting got off is internal at interior pole, is difficult for falling out, and sufficient bone tissue volume can be taken out in the single sample, can effectively improve the success rate of getting the bone.

Drawings

FIG. 1 shows a cross-sectional view of a bone biopsy extractor.

Figure 2 shows a schematic view of the inner rod assembly.

Figure 3 shows a schematic view of the outer rod assembly.

Fig. 4 shows a schematic view of the ram assembly.

Fig. 5 shows a schematic view of the front end of the outer rod.

Fig. 6 shows an enlarged view at a in fig. 1.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in FIGS. 1-4, the present embodiment provides a bone biopsy extractor that includes an inner rod assembly 10, an outer rod assembly 20, and a push rod assembly 30.

The inner rod assembly 10 includes a hollow inner rod 100, wherein the two ends of the inner rod 100 are respectively a front end and a rear end, the front end and the rear end are the end extending into the patient as the front end, the opposite end as the rear end, and the definition of the front end and the rear end of the outer rod 200 and the push rod 300 is defined below. The front end of the inner rod body is a closed end, the rear end of the inner rod body is an open end, the rear end of the inner rod body 100 is fixedly provided with an inner rod handle body 110, the inner rod handle body 110 is provided with an abdicating hole 112 which is aligned with the rear end of the inner rod body, and the side wall of the front end of the inner rod body 100 is provided with a first window 102 which extends along the axial direction of the inner rod body 100.

The outer rod assembly 20 includes a hollow outer rod 200, and the two ends of the outer rod 200 are respectively a front end and a rear end. The front end of the outer rod 200 is a closed end, the rear end is an open end, a second window 202 corresponding to the first window 102 is arranged on the side wall of the front end of the outer rod 200, a cutting blade 204 for cutting laterally is arranged on the edge of the second window 202 along the axial direction of the outer rod 200, the outer rod 200 is sleeved on the periphery of the inner rod 100, the outer rod 200 can rotate around the inner rod 100, when the outer rod 200 rotates, the cutting blade 204 can cut surrounding bone tissues, the bone tissues cut by the cutting blade 204 can fall into the inner rod 100 from the first window 102 to be stored, and a screw cap 210 is further fixed on the rear end of the outer rod 200 for facilitating the operation of the outer rod 200.

The push rod assembly 30 includes a push rod 300, the front end of the push rod 300 is a sharp part, and the push rod can extend from the rear end to the front end of the inner rod body 100 to take out the stored bone tissue in the inner rod body 100, and for the convenience of operation of the push rod 300, a push rod handle 310 is further fixedly disposed at the rear end thereof.

The operation process of the bone biopsy extractor provided by the embodiment is as follows: firstly, after preparation work is done, a skin grafting bone of an implantation point of a patient is stripped, and the front end of the bone biopsy extractor is delivered to a preset position of bone tissues; when the outer rod body 200 rotates, the cutting blade on the second window at the front end of the outer rod body 200 also rotates along with the outer rod body 200, the cutting blade 204 cuts the surrounding bone tissue, and the bone tissue cut by the cutting blade 204 falls into the inner rod body 100 from the first window to be stored; after the bone tissue is taken out, the bone biopsy extractor is taken out of the human body, and the bone tissue is extracted by the ejector rod to complete the whole bone tissue taking action. This bone biopsy extractor adopts the mode that the bone tissue was got in the side direction cutting, can guarantee that the bone tissue cuts off completely, and the bone tissue storage that cuts down is internal at interior pole, is difficult for falling out, and sufficient bone tissue volume can be taken out in the single sample, can effectively improve the success rate of getting the bone.

As a preferred embodiment of the cutting blade 204 in the present embodiment, referring to fig. 5, the cutting blade 204 on the outer rod 200 is a tapered variable diameter cutting blade with a small front end and a large rear end. That is, the cutting blade 204 has a thin edge and a gradually thickened rear portion, and the cutting blade 204 of this structure facilitates the screw-in depth at the time of cutting to obtain a sufficient amount of bone tissue.

As another preferred embodiment of the cutting blade 204 in the present embodiment, referring to fig. 5, the cutting blade 204 is divided into a plurality of sub-blades 2040 along the axial direction of the outer rod 200, and a material discharge notch 2042 is disposed at the joint of two adjacent sub-blades 2040. During cutting, some bone fluid can be expelled from the expulsion recess 2042.

As another preferred embodiment of the cutting blade 204 in the present embodiment, referring to fig. 5, the front end of the outer rod 200 is a drill 206 having an axial cutting blade, and the drill 206 can facilitate the bone biopsy extractor to be inserted into the deep bone tissue of the patient.

More preferably, a liquid discharge hole 2060 is disposed at the middle of the drill head 206 along the axial direction of the outer rod 200 and communicated with the inner cavity of the outer rod 200, so as to discharge liquid after bone tissue extraction, thereby reducing the environmental pollution of the operation.

As a preferred embodiment of the present invention, referring to fig. 1 to 5, when the outer rod 200 rotates to a specific angle relative to the inner rod 100, the outer circumferential wall at the first window 102 of the inner rod 100 can block the second window 202 on the outer rod 200, so as to form a closed bone-taking chamber, which can effectively prevent bone tissue from being lost. In order to make the peripheral wall at the first window 102 block the second window 202 on the outer rod 200, the opening size of the second window 202 should not be larger than the peripheral wall at the first window 102, i.e. the opening size of the second window 202 is at most the same as the peripheral wall at the first window 102, and in order to ensure the sealing performance, it is usually designed to be slightly smaller.

Preferably, the outer peripheral wall of the inner rod 100 at the first window 102 is shaped like a minor arc, and the first window is a small semicircular tube structure formed by cutting 2/3 circles at the front end of the inner rod in this embodiment, so as to increase the space for taking out the bone window, thereby facilitating the storage of bone tissue in the inner rod.

As another preferred embodiment of the present invention, referring to fig. 1, fig. 2 and fig. 6, a snap 104 is fixedly disposed at the rear end of the inner rod 100, and a stop portion matched with the snap 104 is disposed in a screw cap 210 at the rear end of the outer rod 200. Specifically, the elastic buckle 104 in this embodiment is an elastic sheet protruding from the outer wall of the inner rod 100, and the inner peripheral wall of the cap 210 has an annular groove 2100, so that when the outer rod 200 is sleeved on the inner rod 100, the elastic sheet is clamped into the annular groove 2100 to fix the outer rod 200 on the inner rod, thereby preventing the outer rod 200 from being separated from the inner rod 100. When the outer rod 200 needs to be taken down, the outer rod 200 can be taken out by applying a slight force along the axial direction of the outer rod. In addition, the elastic sheet may generate a certain frictional resistance to the inner circumferential wall of the spin cap 210, which may maintain the rotation angle of the outer rod 200 with respect to the inner rod 200.

As another preferred embodiment mode in this embodiment, referring to fig. 1 to fig. 3, the front ends of the inner rod 100 and the outer rod 200 are respectively provided with a first limiting shoulder 106 and a second limiting shoulder 208, which are configured to match with each other, and when the outer rod 200 is sleeved on the inner rod 100, the first limiting shoulder 106 and the second limiting shoulder 208 are matched with each other to limit the depth of the outer rod 200 sleeved on the inner rod 100, so as to facilitate the positioning of the outer rod 200 when sleeved on the inner rod 100 and the protection of the front end of the inner rod 100, and prevent the front end of the inner rod 100 from being damaged.

As another preferred embodiment of this embodiment, referring to fig. 1, 2 and 4, the push rod handle body 310 and the inner rod handle body 110 respectively have a locking member and a locking groove, and when the locking member is located in the locking groove, the push rod 300 and the inner rod body 100 are axially fixed to prevent the push rod from being released. In this embodiment, the rear end of the inner rod handle 110 has a notch 1100 facing the relief hole 112 of the inner rod 100, and the side wall of the notch 1100 has a transversely disposed through slot 1102. The mandrel shank 310 has a rotation portion 3100 extending into the recess 1100, the rotation portion 3100 having a projection 3102 on a peripheral wall thereof capable of being engaged into the through-groove 1102, the mandrel 300 and the inner rod body 100 are axially fixed when the mandrel shank 310 is rotated to engage the projection 3102 into the through-groove 1102, and the mandrel 300 and the inner rod body 100 are axially released when the projection 3102 is rotated out of the through-groove 1102, and the mandrel 300 can be removed from the inner rod body 100 this time.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A bone biopsy extractor, comprising: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

2. The bone biopsy extractor of claim 1, wherein: the cutting blade on the outer rod body is a tapered variable-diameter cutting blade with a small front end and a large rear end.

3. The bone biopsy extractor of claim 1, wherein: the cutting blade is divided into a plurality of sections of sub-blades along the axial direction of the outer rod body, and a discharge gap is arranged at the joint of two adjacent sub-blades.

4. The bone biopsy extractor of claim 1, wherein: when the outer rod body rotates to a specific angle relative to the inner rod body, the outer peripheral wall at the first window of the inner rod body can shield the second window on the outer rod body.

5. The bone biopsy extractor of claim 4, wherein: the peripheral wall of the inner rod body at the first window is in a shape of inferior arc.

6. The bone biopsy extractor of claim 1, wherein: the front end of the outer rod body is a drill bit part with an axial cutting blade.

7. The bone biopsy extractor of claim 6, wherein: and a liquid discharge hole which is axially arranged along the outer rod body and communicated with the inner cavity of the outer rod body is arranged in the middle of the drill bit part.

8. The bone biopsy extractor of claim 1, wherein: the rear end of the outer rod body is fixedly provided with a rotating cap, the rear end of the inner rod body is fixedly provided with an elastic buckle, and a limiting part matched with the elastic buckle is arranged in the rotating cap.

9. The bone biopsy extractor of claim 1, wherein: the front ends of the inner rod body and the outer rod body are respectively provided with a limiting shaft shoulder which is matched with each other.

10. The bone biopsy extractor of claim 1, wherein: the rear end of the ejector rod is fixedly provided with an ejector rod handle body, the ejector rod handle body and the inner rod handle body are respectively provided with a locking piece and a locking groove, and when the locking piece is positioned in the locking groove, the ejector rod and the inner rod body are axially fixed.